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• Project compilation requires a class that is not used anywhere

  - by Susei

  When I build with ant my project that uses libgdx, I get a strange error. It says that a class com.google.gwt.dom.client.ImageElement is not found, but it isn't used at all in the code. How can I find what makes this class necessary? Even searching over the whole project doesn't give any results. It says that error is at PixmapTextureAtlas.java:16 (class source), but there is no code that uses that ImageElement class. Adding the library containing com.google.gwt.dom.client.ImageElement class helps, of course, but I'd like to figure out why this class in needed. Here is the place in ant log that tells of the actual error: Compiling 3 source files to /home/suseika/Projects/tendiwa/client/bin /home/suseika/Projects/tendiwa/client/src/org/tendiwa/client/PixmapTextureAtlas.java:16: error: cannot access ImageElement class file for com.google.gwt.dom.client.ImageElement not found Here is the whole ant log: /usr/lib/jvm/java-7-oracle/bin/java -Xmx128m -Xss2m -Dant.home=/opt/intellijidea/lib/ant -Dant.library.dir=/opt/intellijidea/lib/ant/lib -Dfile.encoding=UTF-8 -classpath /opt/intellijidea/lib/ant/lib/ant-apache-regexp.jar:/opt/intellijidea/lib/ant/lib/ant-swing.jar:/opt/intellijidea/lib/ant/lib/ant-apache-xalan2.jar:/opt/intellijidea/lib/ant/lib/ant-jdepend.jar:/opt/intellijidea/lib/ant/lib/ant-apache-resolver.jar:/opt/intellijidea/lib/ant/lib/ant-jsch.jar:/opt/intellijidea/lib/ant/lib/ant.jar:/opt/intellijidea/lib/ant/lib/ant-testutil.jar:/opt/intellijidea/lib/ant/lib/ant-launcher.jar:/opt/intellijidea/lib/ant/lib/ant-apache-bsf.jar:/opt/intellijidea/lib/ant/lib/ant-commons-logging.jar:/opt/intellijidea/lib/ant/lib/ant-netrexx.jar:/opt/intellijidea/lib/ant/lib/ant-junit.jar:/opt/intellijidea/lib/ant/lib/ant-commons-net.jar:/opt/intellijidea/lib/ant/lib/ant-apache-bcel.jar:/opt/intellijidea/lib/ant/lib/ant-antlr.jar:/opt/intellijidea/lib/ant/lib/ant-apache-log4j.jar:/opt/intellijidea/lib/ant/lib/ant-jai.jar:/opt/intellijidea/lib/ant/lib/ant-apache-oro.jar:/opt/intellijidea/lib/ant/lib/ant-jmf.jar:/opt/intellijidea/lib/ant/lib/ant-javamail.jar:/usr/lib/jvm/java-7-oracle/lib/tools.jar:/opt/intellijidea/lib/idea_rt.jar com.intellij.rt.ant.execution.AntMain2 -logger com.intellij.rt.ant.execution.IdeaAntLogger2 -inputhandler com.intellij.rt.ant.execution.IdeaInputHandler -buildfile /home/suseika/Projects/tendiwa/client/build.xml jar build.xml property path description compile ant property property property description compile mkdir javac jar ant property description _core_src_available available ontology antcall property description _core_src_available available _build_core ant property property compile echo /home/suseika/Projects/tendiwa/client mkdir javac jar jar Building jar: /home/suseika/Projects/tendiwa/MainModule.jar description tempfile mkdir Created dir: /tmp/tendiwa373148820 unjar Expanding: /home/suseika/Projects/tendiwa/MainModule.jar into /tmp/tendiwa373148820 Expanding: /home/suseika/Projects/tendiwa/tendiwa-backend.jar into /tmp/tendiwa373148820 Expanding: /home/suseika/Projects/tendiwa/tendiwa-ontology.jar into /tmp/tendiwa373148820 copy Copying 1 file to /tmp/tendiwa373148820 java Created item short_sword Created item short_bow Created item bucket Created item boot Created item steel_morningstar Created item rifle_ammo Created item handAxe Created item iron_armor Created item steel_mace Created item jacket Created item fedora Created item wooden_arrow Saving sources to /tmp/tendiwa373148820/ontology/src tendiwa/resources/SoundTypes.java tendiwa/resources/CharacterTypes.java tendiwa/resources/ObjectTypes.java tendiwa/resources/FloorTypes.java tendiwa/resources/ItemTypes.java tendiwa/resources/MaterialTypes.java mkdir mkdir mkdir Created dir: /tmp/tendiwa373148820/ontology/bin javac jar Building jar: /home/suseika/Projects/tendiwa/tendiwa-ontology.jar echo Resources source code generated ant property property compile echo /home/suseika/Projects/tendiwa/client mkdir javac jar jar jar Building jar: /home/suseika/Projects/tendiwa/MainModule.jar mkdir javac /home/suseika/Projects/tendiwa/client/build.xml:25: Compile failed; see the compiler error output for details. at org.apache.tools.ant.taskdefs.Javac.compile(Javac.java:1150) at org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:912) at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291) at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106) at org.apache.tools.ant.Task.perform(Task.java:348) at org.apache.tools.ant.Target.execute(Target.java:390) at org.apache.tools.ant.Target.performTasks(Target.java:411) at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1399) at org.apache.tools.ant.Project.executeTarget(Project.java:1368) at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41) at org.apache.tools.ant.Project.executeTargets(Project.java:1251) at org.apache.tools.ant.Main.runBuild(Main.java:809) at org.apache.tools.ant.Main.startAnt(Main.java:217) at org.apache.tools.ant.Main.start(Main.java:180) at org.apache.tools.ant.Main.main(Main.java:268) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at com.intellij.rt.ant.execution.AntMain2.main(AntMain2.java:30) /home/suseika/Projects/tendiwa/client/build.xml (25:46)'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable builds Compiling 3 source files to /home/suseika/Projects/tendiwa/client/bin /home/suseika/Projects/tendiwa/client/src/org/tendiwa/client/PixmapTextureAtlas.java:16: error: cannot access ImageElement class file for com.google.gwt.dom.client.ImageElement not found 1 error /home/suseika/Projects/tendiwa/client/build.xml:25: Compile failed; see the compiler error output for details. at org.apache.tools.ant.taskdefs.Javac.compile(Javac.java:1150) at org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:912) at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291) at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106) at org.apache.tools.ant.Task.perform(Task.java:348) at org.apache.tools.ant.Target.execute(Target.java:390) at org.apache.tools.ant.Target.performTasks(Target.java:411) at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1399) at org.apache.tools.ant.Project.executeTarget(Project.java:1368) at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41) at org.apache.tools.ant.Project.executeTargets(Project.java:1251) at org.apache.tools.ant.Main.runBuild(Main.java:809) at org.apache.tools.ant.Main.startAnt(Main.java:217) at org.apache.tools.ant.Main.start(Main.java:180) at org.apache.tools.ant.Main.main(Main.java:268) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at com.intellij.rt.ant.execution.AntMain2.main(AntMain2.java:30) /home/suseika/Projects/tendiwa/client/build.xml:25: Compile failed; see the compiler error output for details. at org.apache.tools.ant.taskdefs.Javac.compile(Javac.java:1150) at org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:912) at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291) at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106) at org.apache.tools.ant.Task.perform(Task.java:348) at org.apache.tools.ant.Target.execute(Target.java:390) at org.apache.tools.ant.Target.performTasks(Target.java:411) at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1399) at org.apache.tools.ant.Project.executeTarget(Project.java:1368) at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41) at org.apache.tools.ant.Project.executeTargets(Project.java:1251) at org.apache.tools.ant.Main.runBuild(Main.java:809) at org.apache.tools.ant.Main.startAnt(Main.java:217) at org.apache.tools.ant.Main.start(Main.java:180) at org.apache.tools.ant.Main.main(Main.java:268) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at com.intellij.rt.ant.execution.AntMain2.main(AntMain2.java:30) Ant build completed with 3 errors one warning in 4s at 10/30/13 3:09 AM Here is a part of ant file where this error appears: <path id="tendiwa.jars"> <fileset dir="../libs"> <include name="**/*.jar"/> </fileset> <pathelement path="../tendiwa-backend.jar"/> <pathelement path="../tendiwa-ontology.jar"/> <!--<fileset dir="/usr/share/java" includes="gwt*.jar"/>--> </path> <target name="compile"> <ant dir="../MainModule" target="jar"/> <mkdir dir="bin"/> <javac destdir="bin" failonerror="true"> <classpath> <path refid="tendiwa.jars"/> <!--temporary--> <pathelement path="../tendiwa-ontology.jar"/> <!--temporary--> <pathelement path="../MainModule.jar"/> <fileset dir="../libs" includes="**/*.jar"/> </classpath> <src> <pathelement path="Desktop/src"/> <pathelement path="src"/> </src> </javac> </target>

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• jquery on localhost

  - by ace

  I am using Linuxmint (= ubuntu linux 9.10) I installed LAmp server which have apache,php mysql and now i am trying to write jquery code i made a file and it worked perfectly with this link : file:///var/www/jquery/jquery.html but when i use this link, then it doesnt work anymore : http://localhost/jquery/jquery.html the file jquery.min.js is in the same folder and i already changed the src of it in source code to <script type="text/javascript" src="/var/www/jquery/jquery.min.js"></script> <script type="text/javascript" src="jquery.min.js"></script> but none of them works (with localhost link) using firebug I saw these errors: The requested URL /var/www/jquery/jquery.min.js was not found on this server. You don't have permission to access /jquery/jquery.min.js on this server. Apache/2.2.12 (Ubuntu) Server at localhost Port 80 so what do I have to do to make it run?

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• WebKit "Refused to set unsafe header "content-length"

  - by Paul

  I am trying to implement simple xhr abstraction, and am getting this warning when trying to set the headers for a POST. I think it might have something to do with setting the headers in a separate js file, because when i set them in the <script> tag in the .html file, it worked fine. The POST request is working fine, but I get this warning, and am curious why. I get this warning for both content-length and connection headers, but only in WebKit browsers (Chrome 5 beta and Safari 4). In Firefox, I don't get any warnings, the Content-Length header is set to the correct value, but the Connection is set to keep-alive instead of close, which makes me think that it is also ignoring my setRequestHeader calls and generating it's own. I have not tried this code in IE. Here is the markup & code: test.html: <!DOCTYPE html> <html> <head> <script src="jsfile.js"></script> <script> var request = new Xhr('POST', 'script.php', true, 'data=somedata', function(data) { console.log(data.text); }); </script> </head> <body> </body> </html> jsfile.js: function Xhr(method, url, async, data, callback) { var x; if(window.XMLHttpRequest) { x = new XMLHttpRequest(); x.open(method, url, async); x.onreadystatechange = function() { if(x.readyState === 4) { if(x.status === 200) { var data = { text: x.responseText, xml: x.responseXML }; callback.call(this, data); } } } if(method.toLowerCase() === "post") { x.setRequestHeader("Content-Type", "application/x-www-form-urlencoded"); x.setRequestHeader("Content-Length", data.length); x.setRequestHeader("Connection", "close"); } x.send(data); } else { // ... implement IE code here ... } return x; }

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• Perl Tk button widget size vary with different xterm clients

  - by Manu

  Hi, I have a perl/tk script in which I am creating a button widget of height 1. Now when I execute script through citrix xterm client I get button displayed. Again when I execute script now through xterm client in my PC size of button widget differs. Can someone explain why is this happening, and what should I do so that size of button widget remains constant with different xterm clients.

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• What is a proper way to pass a parameter to Set-Alias in powershell?

  - by Nick Gorbikoff

  Hello. A little background: I use PowerShell on windows xp at work and I set a bunch of useful shortcuts in Microsoft.PowerShell_profile.ps1 in My Documents, trying to emulate Mac environment inspired by Ryan Bates's shortcuts I have things like: Set-Alias rsc Rails-Console function Rails-Console {Invoke-Expression "ruby script/console"} Which works just fine when in command prompt I say: rsc #it calls the proper command However this doesn't work properly Set-Alias rsg Rails-Generate function Rails-Generate {Invoke-Expression "ruby script/generate"} So when I do : rsg model User which is supposed to call ruby script/generate model User all it calls is ruby script/generate #Dumping my params So how would I properly modify my functions to take params I send to functions? Thank you!!

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• Metro: Query Selectors

  - by Stephen.Walther

  The goal of this blog entry is to explain how to perform queries using selectors when using the WinJS library. In particular, you learn how to use the WinJS.Utilities.query() method and the QueryCollection class to retrieve and modify the elements of an HTML document. Introduction to Selectors When you are building a Web application, you need some way of easily retrieving elements from an HTML document. For example, you might want to retrieve all of the input elements which have a certain class. Or, you might want to retrieve the one and only element with an id of favoriteColor. The standard way of retrieving elements from an HTML document is by using a selector. Anyone who has ever created a Cascading Style Sheet has already used selectors. You use selectors in Cascading Style Sheets to apply formatting rules to elements in a document. For example, the following Cascading Style Sheet rule changes the background color of every INPUT element with a class of .required in a document to the color red: input.red { background-color: red } The “input.red” part is the selector which matches all INPUT elements with a class of red. The W3C standard for selectors (technically, their recommendation) is entitled “Selectors Level 3” and the standard is located here: http://www.w3.org/TR/css3-selectors/ Selectors are not only useful for adding formatting to the elements of a document. Selectors are also useful when you need to apply behavior to the elements of a document. For example, you might want to select a particular BUTTON element with a selector and add a click handler to the element so that something happens whenever you click the button. Selectors are not specific to Cascading Style Sheets. You can use selectors in your JavaScript code to retrieve elements from an HTML document. jQuery is famous for its support for selectors. Using jQuery, you can use a selector to retrieve matching elements from a document and modify the elements. The WinJS library enables you to perform the same types of queries as jQuery using the W3C selector syntax. Performing Queries with the WinJS.Utilities.query() Method When using the WinJS library, you perform a query using a selector by using the WinJS.Utilities.query() method.  The following HTML document contains a BUTTON and a DIV element: <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Application1</title> <!-- WinJS references --> <link href="//Microsoft.WinJS.0.6/css/ui-dark.css" rel="stylesheet"> <script src="//Microsoft.WinJS.0.6/js/base.js"></script> <script src="//Microsoft.WinJS.0.6/js/ui.js"></script> <!-- Application1 references --> <link href="/css/default.css" rel="stylesheet"> <script src="/js/default.js"></script> </head> <body> <button>Click Me!</button> <div style="display:none"> <h1>Secret Message</h1> </div> </body> </html> The document contains a reference to the following JavaScript file named \js\default.js: (function () { "use strict"; var app = WinJS.Application; app.onactivated = function (eventObject) { if (eventObject.detail.kind === Windows.ApplicationModel.Activation.ActivationKind.launch) { WinJS.Utilities.query("button").listen("click", function () { WinJS.Utilities.query("div").clearStyle("display"); }); } }; app.start(); })(); The default.js script uses the WinJS.Utilities.query() method to retrieve all of the BUTTON elements in the page. The listen() method is used to wire an event handler to the BUTTON click event. When you click the BUTTON, the secret message contained in the hidden DIV element is displayed. The clearStyle() method is used to remove the display:none style attribute from the DIV element. Under the covers, the WinJS.Utilities.query() method uses the standard querySelectorAll() method. This means that you can use any selector which is compatible with the querySelectorAll() method when using the WinJS.Utilities.query() method. The querySelectorAll() method is defined in the W3C Selectors API Level 1 standard located here: http://www.w3.org/TR/selectors-api/ Unlike the querySelectorAll() method, the WinJS.Utilities.query() method returns a QueryCollection. We talk about the methods of the QueryCollection class below. Retrieving a Single Element with the WinJS.Utilities.id() Method If you want to retrieve a single element from a document, instead of matching a set of elements, then you can use the WinJS.Utilities.id() method. For example, the following line of code changes the background color of an element to the color red: WinJS.Utilities.id("message").setStyle("background-color", "red"); The statement above matches the one and only element with an Id of message. For example, the statement matches the following DIV element: <div id="message">Hello!</div> Notice that you do not use a hash when matching a single element with the WinJS.Utilities.id() method. You would need to use a hash when using the WinJS.Utilities.query() method to do the same thing like this: WinJS.Utilities.query("#message").setStyle("background-color", "red"); Under the covers, the WinJS.Utilities.id() method calls the standard document.getElementById() method. The WinJS.Utilities.id() method returns the result as a QueryCollection. If no element matches the identifier passed to WinJS.Utilities.id() then you do not get an error. Instead, you get a QueryCollection with no elements (length=0). Using the WinJS.Utilities.children() method The WinJS.Utilities.children() method enables you to retrieve a QueryCollection which contains all of the children of a DOM element. For example, imagine that you have a DIV element which contains children DIV elements like this: <div id="discussContainer"> <div>Message 1</div> <div>Message 2</div> <div>Message 3</div> </div> You can use the following code to add borders around all of the child DIV element and not the container DIV element: var discussContainer = WinJS.Utilities.id("discussContainer").get(0); WinJS.Utilities.children(discussContainer).setStyle("border", "2px dashed red");   It is important to understand that the WinJS.Utilities.children() method only works with a DOM element and not a QueryCollection. Notice that the get() method is used to retrieve the DOM element which represents the discussContainer. Working with the QueryCollection Class Both the WinJS.Utilities.query() method and the WinJS.Utilities.id() method return an instance of the QueryCollection class. The QueryCollection class derives from the base JavaScript Array class and adds several useful methods for working with HTML elements: addClass(name) – Adds a class to every element in the QueryCollection. clearStyle(name) – Removes a style from every element in the QueryCollection. conrols(ctor, options) – Enables you to create controls. get(index) – Retrieves the element from the QueryCollection at the specified index. getAttribute(name) – Retrieves the value of an attribute for the first element in the QueryCollection. hasClass(name) – Returns true if the first element in the QueryCollection has a certain class. include(items) – Includes a collection of items in the QueryCollection. listen(eventType, listener, capture) – Adds an event listener to every element in the QueryCollection. query(query) – Performs an additional query on the QueryCollection and returns a new QueryCollection. removeClass(name) – Removes a class from the every element in the QueryCollection. removeEventListener(eventType, listener, capture) – Removes an event listener from every element in the QueryCollection. setAttribute(name, value) – Adds an attribute to every element in the QueryCollection. setStyle(name, value) – Adds a style attribute to every element in the QueryCollection. template(templateElement, data, renderDonePromiseContract) – Renders a template using the supplied data.  toggleClass(name) – Toggles the specified class for every element in the QueryCollection. Because the QueryCollection class derives from the base Array class, it also contains all of the standard Array methods like forEach() and slice(). Summary In this blog post, I’ve described how you can perform queries using selectors within a Windows Metro Style application written with JavaScript. You learned how to return an instance of the QueryCollection class by using the WinJS.Utilities.query(), WinJS.Utilities.id(), and WinJS.Utilities.children() methods. You also learned about the methods of the QueryCollection class.

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• C#: String Concatenation vs Format vs StringBuilder

  - by James Michael Hare

  I was looking through my groups’ C# coding standards the other day and there were a couple of legacy items in there that caught my eye.  They had been passed down from committee to committee so many times that no one even thought to second guess and try them for a long time.  It’s yet another example of how micro-optimizations can often get the best of us and cause us to write code that is not as maintainable as it could be for the sake of squeezing an extra ounce of performance out of our software. So the two standards in question were these, in paraphrase: Prefer StringBuilder or string.Format() to string concatenation. Prefer string.Equals() with case-insensitive option to string.ToUpper().Equals(). Now some of you may already know what my results are going to show, as these items have been compared before on many blogs, but I think it’s always worth repeating and trying these yourself.  So let’s dig in. The first test was a pretty standard one.  When concattenating strings, what is the best choice: StringBuilder, string concattenation, or string.Format()? So before we being I read in a number of iterations from the console and a length of each string to generate.  Then I generate that many random strings of the given length and an array to hold the results.  Why am I so keen to keep the results?  Because I want to be able to snapshot the memory and don’t want garbage collection to collect the strings, hence the array to keep hold of them.  I also didn’t want the random strings to be part of the allocation, so I pre-allocate them and the array up front before the snapshot.  So in the code snippets below: num – Number of iterations. strings – Array of randomly generated strings. results – Array to hold the results of the concatenation tests. timer – A System.Diagnostics.Stopwatch() instance to time code execution. start – Beginning memory size. stop – Ending memory size. after – Memory size after final GC. So first, let’s look at the concatenation loop: 1: // build num strings using concattenation. 2: for (int i = 0; i < num; i++) 3: { 4: results[i] = "This is test #" + i + " with a result of " + strings[i]; 5: } Pretty standard, right?  Next for string.Format(): 1: // build strings using string.Format() 2: for (int i = 0; i < num; i++) 3: { 4: results[i] = string.Format("This is test #{0} with a result of {1}", i, strings[i]); 5: }   Finally, StringBuilder: 1: // build strings using StringBuilder 2: for (int i = 0; i < num; i++) 3: { 4: var builder = new StringBuilder(); 5: builder.Append("This is test #"); 6: builder.Append(i); 7: builder.Append(" with a result of "); 8: builder.Append(strings[i]); 9: results[i] = builder.ToString(); 10: } So I take each of these loops, and time them by using a block like this: 1: // get the total amount of memory used, true tells it to run GC first. 2: start = System.GC.GetTotalMemory(true); 3:  4: // restart the timer 5: timer.Reset(); 6: timer.Start(); 7:  8: // *** code to time and measure goes here. *** 9:  10: // get the current amount of memory, stop the timer, then get memory after GC. 11: stop = System.GC.GetTotalMemory(false); 12: timer.Stop(); 13: other = System.GC.GetTotalMemory(true); So let’s look at what happens when I run each of these blocks through the timer and memory check at 500,000 iterations: 1: Operator + - Time: 547, Memory: 56104540/55595960 - 500000 2: string.Format() - Time: 749, Memory: 57295812/55595960 - 500000 3: StringBuilder - Time: 608, Memory: 55312888/55595960 – 500000   Egad!  string.Format brings up the rear and + triumphs, well, at least in terms of speed.  The concat burns more memory than StringBuilder but less than string.Format().  This shows two main things: StringBuilder is not always the panacea many think it is. The difference between any of the three is miniscule! The second point is extremely important!  You will often here people who will grasp at results and say, “look, operator + is 10% faster than StringBuilder so always use StringBuilder.”  Statements like this are a disservice and often misleading.  For example, if I had a good guess at what the size of the string would be, I could have preallocated my StringBuffer like so:   1: for (int i = 0; i < num; i++) 2: { 3: // pre-declare StringBuilder to have 100 char buffer. 4: var builder = new StringBuilder(100); 5: builder.Append("This is test #"); 6: builder.Append(i); 7: builder.Append(" with a result of "); 8: builder.Append(strings[i]); 9: results[i] = builder.ToString(); 10: }   Now let’s look at the times: 1: Operator + - Time: 551, Memory: 56104412/55595960 - 500000 2: string.Format() - Time: 753, Memory: 57296484/55595960 - 500000 3: StringBuilder - Time: 525, Memory: 59779156/55595960 - 500000   Whoa!  All of the sudden StringBuilder is back on top again!  But notice, it takes more memory now.  This makes perfect sense if you examine the IL behind the scenes.  Whenever you do a string concat (+) in your code, it examines the lengths of the arguments and creates a StringBuilder behind the scenes of the appropriate size for you. But even IF we know the approximate size of our StringBuilder, look how much less readable it is!  That’s why I feel you should always take into account both readability and performance.  After all, consider all these timings are over 500,000 iterations.   That’s at best  0.0004 ms difference per call which is neglidgable at best.  The key is to pick the best tool for the job.  What do I mean?  Consider these awesome words of wisdom: Concatenate (+) is best at concatenating.  StringBuilder is best when you need to building. Format is best at formatting. Totally Earth-shattering, right!  But if you consider it carefully, it actually has a lot of beauty in it’s simplicity.  Remember, there is no magic bullet.  If one of these always beat the others we’d only have one and not three choices. The fact is, the concattenation operator (+) has been optimized for speed and looks the cleanest for joining together a known set of strings in the simplest manner possible. StringBuilder, on the other hand, excels when you need to build a string of inderterminant length.  Use it in those times when you are looping till you hit a stop condition and building a result and it won’t steer you wrong. String.Format seems to be the looser from the stats, but consider which of these is more readable.  Yes, ignore the fact that you could do this with ToString() on a DateTime.  1: // build a date via concatenation 2: var date1 = (month < 10 ? string.Empty : "0") + month + '/' 3: + (day < 10 ? string.Empty : "0") + '/' + year; 4:  5: // build a date via string builder 6: var builder = new StringBuilder(10); 7: if (month < 10) builder.Append('0'); 8: builder.Append(month); 9: builder.Append('/'); 10: if (day < 10) builder.Append('0'); 11: builder.Append(day); 12: builder.Append('/'); 13: builder.Append(year); 14: var date2 = builder.ToString(); 15:  16: // build a date via string.Format 17: var date3 = string.Format("{0:00}/{1:00}/{2:0000}", month, day, year); 18:  So the strength in string.Format is that it makes constructing a formatted string easy to read.  Yes, it’s slower, but look at how much more elegant it is to do zero-padding and anything else string.Format does. So my lesson is, don’t look for the silver bullet!  Choose the best tool.  Micro-optimization almost always bites you in the end because you’re sacrificing readability for performance, which is almost exactly the wrong choice 90% of the time. I love the rules of optimization.  They’ve been stated before in many forms, but here’s how I always remember them: For Beginners: Do not optimize. For Experts: Do not optimize yet. It’s so true.  Most of the time on today’s modern hardware, a micro-second optimization at the sake of readability will net you nothing because it won’t be your bottleneck.  Code for readability, choose the best tool for the job which will usually be the most readable and maintainable as well.  Then, and only then, if you need that extra performance boost after profiling your code and exhausting all other options… then you can start to think about optimizing.

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• firefox: How to enable local javascript to read/write files on my PC?

  - by Nok Imchen

  well, since greasemonkey cant read/write files from local hard disk. I've heard people suggesting Google gears but i've no idea obout gears :( So, what i've decided is to add a script type="text/javascript" src="file:///c:/test.js"/script Now, this test will use FileSystemObject to read/write file. Since, the "file:///c:/test.js" is a javascript file from local hard disk, so it should probable be able to read/write file on my local hard disk. I tried it but firefox prevented the "file:///c:/test.js" script to read/write files from local diak :( What i want to know is: Is there any setting in firefox about:config where we can specify to let a particular script, say from localfile or xyz.com, to have read/write permission on my local disk files??

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• jQuery in sharepoint retruning Object Expected

  - by Simon Thompson

  When I add jquery to sharepoint 2007 (MOSS) and try and use it on a page no matter what I write on the client i get an "object expected" at the line/column where the "$" appears. I have used fiddler to check that the client is downloading the query JS (which it is) But its like its being ignore and therefor eth "$" is not understood. Searching google everybody is saying its the selector not finding the elements but see code below I do not see how it can not find my very simple example. In master page in header <script type="text/javascript" src="jquery.min.js"></script> version 1.4.2 On a page <a href="javascript:abc();">Testing</a> <script> function abc(){ $("#simon").css("border","3px solid red"); } </script> <div id="simon">

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• Problems with Widgets in dojox DataGrid

  - by Kitson

  I am trying to include some editing Widgets in my dojox.grid.DataGrid seem to be having a lot of difficulty. I have tried everything I can think of to get it to work, but something just isn't going right. When I started having problems, I tried to copy almost exactly from the grid tests and model my "breakout" of code just like that, but without success. Basic editing of the Grid seems to work. In the example below, the "Events" column allows edits, but the two columns that are using the cellType attribute don't work. In fact they also seem to ignore the other attributes (like the styles) which would seem to indicate that some sort of issue was run into, but there is nothing in FireBug. Also I get the same behaviour between Chrome and Firefox. <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <title>Insert title here</title> <link id="themeStyles" rel="stylesheet" href="javascript/dojotoolkit/dijit/themes/tundra/tundra.css"> <style type="text/css"> @import "css/gctilog.css"; @import "javascript/dojotoolkit/dojo/resources/dojo.css"; @import "javascript/dojotoolkit/dijit/themes/tundra/tundra.css"; @import "javascript/dojotoolkit/dojox/grid/resources/Grid.css"; @import "javascript/dojotoolkit/dojox/grid/resources/tundraGrid.css"; @import "javascript/dojotoolkit/ocp/resources/MultiStateCheckBox.css"; </style> <script type="text/javascript" src="javascript/dojotoolkit/dojo/dojo.js" djConfig="parseOnLoad:true, isDebug:true, locale:'en-gb'"></script> <script type="text/javascript"> dojo.require("dojo.currency"); dojo.require("dijit.dijit"); dojo.require("dijit.form.HorizontalSlider"); dojo.require("dojox.data.JsonRestStore"); dojo.require("dojox.grid.DataGrid"); dojo.require("dojox.layout.ExpandoPane"); dojo.require("dojox.timing"); dojo.require("ocp.MultiStateCheckBox"); dojo.require("dojo.parser"); formatCurrency = function(inDatum){ return isNaN(inDatum) ? '...' : dojo.currency.format(inDatum, this.constraint); } </script> <script type="text/javascript" src="javascript/formatter.js"></script> <script type="text/javascript" src="javascript/utilities.js"></script> </head> <body class="tundra"> <div name="labelCallids">Call IDs</div> <div dojoType="dojox.data.JsonRestStore" id="callidStore4" jsId="callidStore4" target="logmap/maps.php/maps/4/callids/" idAttribute="callid"></div> <table dojoType="dojox.grid.DataGrid" id="callidGrid4" store="callidStore4" query="{ callid: '*' }" style="width: 950px; border: 1px solid rgb(0,156,221); margin-left: 15px;" clientSort="false" autoHeight="10" noDataMessage="No Call IDs Available..."> <thead> <tr> <th field="callid" width="375px">Call ID</th> <th cellType="dojox.grid.cells.ComboBox" field="type" options="SIP,TLib" editable="true" width="10em" styles='text-align: center;'>Type</th> <th field="event_count" width="40px" editable="true" styles="text-align: right;">Events</th> <th field="start_ts" width="75px" formatter="secToHourMinSecMS">Start</th> <th field="end_ts" width="75px" formatter="secToHourMinSecMS">End</th> <th field="duration" width="75px" formatter="secToHourMinSecMS">Duration</th> <th cellType="dojox.grid.cells._Widget" widgetClass="dijit.form.HorizontalSlider" field="include" formatter="formatCurrency" constraint="{currency:'EUR'}" editable="true" width="10em" styles='text-align: right;'>Amount</th> </tr> </thead> </table> </body> </html> Is there anything that I am missing. It would seem to be fundamental, but I just can't seem to see it. [EDIT] What I have done instead is return a dijit Widget using the formatter to return a widget. So in the declarative model, I specify something like this: <th field="type" formatter="getMultiField" width="10em" styles='text-align: center;'>Type</th> And then I wrote a JavaScript function like the below to return the widget I wanted. function getMultiField(value) { var jsonValue = JSON.parse(value); //I provide the value of the widget as JSON //from my data store, so I need to parse it var control = new ocp.MultiStateCheckBox({ //my custom widget id : "dMSCB"+(new Date).getTime()+Math.ceil(Math.random()*100000), //generate a unique ID value : jsonValue.value, onChange : function (value {...}) //code to manipulate the underlying data store }); return control; //The dojo 1.4 grid can handle a returned Widget }

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• Prevent onbeforeunload from being called when clicking on mailto link

  - by Amit

  Is there anyway to prevent onbeforeunload from being called when clicking on mailto link in chrome. In FF, Safari, IE it is working fine. <html> <head> <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"> google.load("jquery", "1.3.2"); </script> <script type="text/javascript"> $(document).ready(function(){ window.onbeforeunload = confirmExit; }); function confirmExit() { return "Are you sure?"; } </script> </head> <body> <a href="mailto:[email protected]?subject=test mail&body=Hello%20World">Mail Link</a> </body> </html>

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• Dojo JsonRest store and dijit.Tree

  - by user1427712

  I'm having a some problem making JSonRest store and dijit.Tree with ForestModel. I've tried some combination of JsonRestStore and json data format following many tips on the web, with no success. At the end, taking example form here http://blog.respondify.se/2011/09/using-dijit-tree-with-the-new-dojo-object-store/ I've made up this simple page (I'm using dojotolkit 1.7.2) <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Tree Model Explorer</title> <script type="text/javascript"> djConfig = { parseOnLoad : true, isDebug : true, } </script> <script type="text/javascript" djConfig="parseOnLoad: true" src="lib/dojo/dojo.js"></script> <script type="text/javascript"> dojo.require("dojo.parser"); dojo.require("dijit.Tree"); dojo.require("dojo.store.JsonRest"); dojo.require("dojo.data.ObjectStore"); dojo.require("dijit.tree.ForestStoreModel"); dojo.addOnLoad(function() { var objectStore = new dojo.store.JsonRest({ target : "test.json", labelAttribute : "name", idAttribute: "id" }); var dataStore = new dojo.data.ObjectStore({ objectStore : objectStore }); var treeModel = new dijit.tree.ForestStoreModel({ store : dataStore, deferItemLoadingUntilExpand : true, rootLabel : "Subjects", query : { "id" : "*" }, childrenAttrs : [ "children" ] }); var tree = new dijit.Tree({ model : treeModel }, 'treeNode'); tree.startup(); }); </script> </head> <body> <div id="treeNode"></div> </body> </html> My rest service responds the following json { data: [ { "id": "PippoId", "name": "Pippo", "children": [] }, { "id": "PlutoId", "name": "Pluto", "children": [] }, { "id": "PaperinoId", "name": "Paperino", "children": [] } ]} I've tried also with the following response (actually my final intention n is to use lazy loading for the tree) { data: [ { "id": "PippoId", "name": "Pippo", "$ref": "author0", "children": true }, { "id": "PlutoId", "name": "Pluto", "$ref": "author1", "children": true }, { "id": "PaperinoId", "name": "Paperino", "$ref": "author2", "children": true } ]} Neither of the two works. I see no error message in firebug. I simply see the root "Subject" on the page. Thanks to anybody could help in some way.

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• simple web parts in asp.net show as blank page

  - by Javaman59

  I am trying to develop web parts in VS 2008/WinXP I created a Web Site project, and added a couple of web parts within the default form in default.aspx <form id="form1" runat="server"> <div> <asp:WebPartManager ID="WebPartManager1" runat="server"> </asp:WebPartManager> <asp:WebPartZone ID="WebPartZone1" runat="server"> </asp:WebPartZone> </div> </form> When I first ran it (in the debugger), a popup told to me enable Windows authentication in IIS (so something is working!). I enabled the Windows authentication, and now when I run it I get a blank screen. Same result if I open it in IE via the url (rather than debugger). Following is the the source view. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head><title> </title><style type="text/css"> .WebPartZone1_0 { border-color:Black;border-width:1px;border-style:Solid; } </style></head> <body> <form name="form1" method="post" action="Default.aspx" id="form1"> <div> <input type="hidden" name="__WPPS" id="__WPPS" value="s" /> <input type="hidden" name="__EVENTTARGET" id="__EVENTTARGET" value="" /> <input type="hidden" name="__EVENTARGUMENT" id="__EVENTARGUMENT" value="" /> <input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="/wEPDwULLTEzNTQyOTkwNDZkZEAVY0VcQaHLv3uaF3svWgCOfsmb" /> </div> <script type="text/javascript"> //<![CDATA[ var theForm = document.forms['form1']; if (!theForm) { theForm = document.form1; } function __doPostBack(eventTarget, eventArgument) { if (!theForm.onsubmit || (theForm.onsubmit() != false)) { theForm.__EVENTTARGET.value = eventTarget; theForm.__EVENTARGUMENT.value = eventArgument; theForm.submit(); } } //]]> </script> <script src="/WebPartsSite/WebResource.axd?d=4lwrtwXryJ3Ri-GXAxZR4g2&amp;t=634003643420884071" type="text/javascript"></script> <div> <table cellspacing="0" cellpadding="0" border="0" id="WebPartZone1"> <tr> <td style="height:100%;"><table cellspacing="0" cellpadding="2" border="0" style="width:100%;height:100%;"> <tr> <td style="height:100%;"></td> </tr> </table></td> </tr> </table> </div> <script type="text/javascript"> //<![CDATA[ var __wpmExportWarning='This Web Part Page has been personalized. As a result, one or more Web Part properties may contain confidential information. Make sure the properties contain information that is safe for others to read. After exporting this Web Part, view properties in the Web Part description file (.WebPart) by using a text editor such as Microsoft Notepad.';var __wpmCloseProviderWarning='You are about to close this Web Part. It is currently providing data to other Web Parts, and these connections will be deleted if this Web Part is closed. To close this Web Part, click OK. To keep this Web Part, click Cancel.';var __wpmDeleteWarning='You are about to permanently delete this Web Part. Are you sure you want to do this? To delete this Web Part, click OK. To keep this Web Part, click Cancel.';//]]> </script> <script type="text/javascript"> __wpm = new WebPartManager(); __wpm.overlayContainerElement = null; __wpm.personalizationScopeShared = true; var zoneElement; var zoneObject; zoneElement = document.getElementById('WebPartZone1'); if (zoneElement != null) { zoneObject = __wpm.AddZone(zoneElement, 'WebPartZone1', true, false, 'black'); } </script> </form> </body> </html>

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• FB Init - reloadIfSessionStateChanged is not working

  - by Naresh

  Can some one plz tell me whats wrong with below code. After i login it doesnt do anything ... neither reloading the page nor setting the login FB cookies. Its a simple code but i'm not sure what i'm doing wrong. <script type="text/javascript" src="http://static.ak.connect.facebook.com/js/api_lib/v0.4/FeatureLoader.js.php"></script> <script type="text/javascript"> FB.init(FB_API_KEY, "xd_receiver.htm",{"reloadIfSessionStateChanged":true}); </script> <a href='#' onclick='FB.Connect.requireSession(); return false;'> <img id='fb_login_image' src='fblogin.jpg' alt='Connect' /> </a>

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• Uploadify plugin doesn't call Java Servlet

  - by sergionni

  Hello,i just started using Uploadify flash plugin instead of standard HTML UI. And met the next problem: when I click "Upload Files" link,that progress is shown and "completed" status is appeared, but in reality - it didn't happened anything,Java Servlet isn't called from backend. There is upload servlet and uploading performed next way earlier: < form enctype="multipart/form-data" method="post" target="uploadFrame" action="<%= request.getContextPath() %>/uploadFile?portletId=${portletId}&remoteFolder=${remoteFolder}">... After providing Uploadify plugin, UI now looks like: plugin part(configuration): <script> ... oScript.text+= "$j('#uploadify').uploadify({"; oScript.text+= "'uploader' : 'kne-portlets/js/lib/uploadify/scripts/uploadify.swf',"; oScript.text+= "'script' : '<%= request.getContextPath() %>/uploadFile?portletId=${portletId}&remoteFolder=<%= decodedString %>',"; oScript.text+= "'cancelImg': 'kne-portlets/js/lib/uploadify/cancel.png',"; oScript.text+= "'folder' : '<%= decodedString %>',"; oScript.text+= "'queueID' : 'fileQueue',"; oScript.text+= "'auto' : false,"; oScript.text+= "'multi' : false,"; //oScript.text+= "'sizeLimit' : 1000"; oScript.text+= "});"; oScript.text+= "});"; ... </script> 'scripts' parameter here points to Java Servlet on backend <%= decodedString %> is folder path, which value is \\file-srv\demo part for uploading: <input type="file" name="uploadify" id="uploadify" /> <a href="javascript:$j('#uploadify').uploadifyUpload();">Upload Files</a> Where is my fault? 'Script' param in plugin config points to Java Servlet on backend and it's done,but Servlet isn't triggered. error, when 'script' param isn't correct:http://img190.imageshack.us/i/errormm.png/ Thank you for assistance.

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• Javascript Noob: How to emulate slideshow on front page by automatically cycling through existing ho

  - by Zildjoms

  hey everyone. hope you could help me out am working on this website and i've finished all the hover effects i like - they're exactly how i want them to be: http://s5ent.brinkster.net/beta3.asp - try hovering over the four links and you'll see a very simple fade effect at work, which degrades into a regular css hover without javascript. what i plan to do is to make the page look like it had a fancy slideshow going on upon loading and while idle, and i wanted to achieve that by capitalizing on the existing hover styling/behavior of the main page links instead of using another script to create the effect from scratch. to do this i imagined i'll need a script that emulates a hover action on each link at regular time intervals once the page has loaded, starting from left to right (footcare, lawn & equipment, about us, contact us), looping through all 4 links indefinitely (footcare, lawn & equipment, about us, contact us, footcare, lawn& equipment, etc.) but pauses when any of them have been actually hovered over by a viewer and resumes from wherever the user left off upon mouseout. hope you get my drift... i also want to achieve this without unnecessarily disrupting the current html. so i guess everything will have to be done by scripting as much as possible.. i'm very new to javascript and jquery. as you can see at s5ent.brinkster.net/beta3.1-autohover.asp, the following script i made works wrong: it hovers-on all of them at the same time and doesn't hover-out anymore. when you try to actually hover into and out of each link the link just comes back on: <script type="text/javascript"> $(document).ready(function () { var speed = 5000; var run = setInterval('rotate()', speed); }); function rotate() { $('.lilevel1 a').each(function(i) { $(this).mouseover(); }); } </script> it's just gross. aside from the fact that this last bit of script isn't even working in ie. could you please help me make this thing happen? that'd be really sweet, guys. i know there are tonsa geniuses out there who could whip this up in no time. or if you have a better way to go about it by all means kindly lemme know. thanks guys, hope you're all havin a blast.

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• Facebook multi-friend-selector + new javascript API = BROKEN ?

  - by Simon_Weaver

  I am using the fb:serverfbml tag to render a multi-friend-selector inside an IFrame. I am using the new javascript API. I have been trying ALL DAY to get it working. When I click on the underlines 'selected' link (to filter by the selected friends) the whole page refreshes and the selected friends disappear. Does the multi-friend-selector just not work with the javascript API? <fb:serverfbml> <script type="text/fbml"> <fb:request-form action="http://apps.facebook.com/rollingrazor/" target="_top" method="POST" invite="true" type="Blah blah blah" content="Blah blah! &lt;fb:req-choice url=&quot;http://apps.facebook.com/rollingrazor/&quot; label=&quot;Let me check my friends&quot; /&gt;"> <fb:multi-friend-selector showborder="false" actiontext="Invite your friends" rows="5" cols="5" bypass="cancel" target="_top" /> </fb:request-form> </script> </fb:serverfbml> <div id="fb-root"></div> <script> window.fbAsyncInit = function () { FB.init({ appId: 'xxxxxxx', status: true, cookie: true, xfbml: true }); }; (function () { var e = document.createElement('script'); e.async = true; e.src = document.location.protocol + '//connect.facebook.net/en_US/all.js'; document.getElementById('fb-root').appendChild(e); } ()); </script> Can someone give me a working example using new javascript API with a multi-friend-selector?

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• Debug message "Resource interpreted as other but transferred with MIME type application/javascript"

  - by Gary Pearman

  OK, I understand what the messages means, but I'm really not sure what's causing it. I'm using Safari and the Web Inspector on Mac OS X, by the way. I've got the following in my document head: <script src="http://local.url/a/js/jquery.js" type="text/javascript"></script> <script src="http://local.url/a/js/jquery.inplace.js" type="text/javascript"></script> jquery.js is handled fine, but the other file causes the warning. It also seems that the javascript in this file never gets executed. The file is being served via mod_deflate, so it is gzip encoded, but so is the other file. Has anybody got any ideas what's causing this, or how to resolve it? Cheers all, Gaz.

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• What permissions/rights are needed to run regsvr32 /s /c "myocx.ocx"

  - by Christian Rodemeyer

  I have a WindowsXP configured as a build machine. The build process runs under an account which isn't an administrator. Some projects register as a last step an ocx control with something like regsvr32 /s /c ".\debug\myocx.ocx" This step fails and I assume that this has something to do with rights because doing the same under an admin account works fine. What rights/permissions/policies do I need to give the build account and where do I do it? (Browsing Local Users and Groups and Local Security Settings haven't helped me)

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• Bash scripting problem

  - by komidore64

  I'm writing a bash script to sync my iTunes music directory to a directory on a removable hard drive. The script works fine when there is absolutely nothing in the folder on the external hard drive. Once all files have been copied to the external drive, then the script begins to act strange. Even though i just sync'd everything over, it proceeds to recopy certain files again. After the initial sync, it chooses the same files to resync each consecutive time the script is executed without any changes being made to the source directory. #!/bin/bash # shell script to sync music with gigabeat and/or firewire drive musicdir="/Users/komidore64/Music/iTunes/iTunes Media/Music" gigadir="/Volumes/GIGABEAT/music" # fwdir="/Volumes/" remove() { find "$1" \ ! \( -name "*.wav" \ -o -name "*.ogg" \ -o -name "*.flac" \ -o -name "*.aac" \ -o -name "*.mp3" \ -o -name "*.m4a" \ -o -name "*.wma" \ -o -name "*.m4p" \ -o -name "*.ape" \ -o -type d \) \ -exec rm -i {} \; } if [ $# == 0 ]; then echo "no device argument present" echo "specify '-g' for gigabeat" echo "or '-f' for firewire drive" else remove "$musicdir" while [ $1 ]; do case $1 in -g | --gigabeat ) rsync --archive --verbose --delete "$musicdir/" "$gigadir" ;; -f | --firewire ) rsync --archive --verbose --delete "$musicdir/" "$fwdir" esac shift done echo "music synced" fi

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• FBML is not rendered in Facebook App in iframe - please help

  - by Jakob

  I'm developing an Facebook Application in PHP. It's loaded as an iframe and not as FBML. The normal interaction with Facebook works. For example the following code gives the username: $facebook = new Facebook($config->appapikey, $config->appsecret); $user_id = $facebook->require_login($required_permissions = 'email'); echo $user->name; Where $user is my class in which the user-details are loaded from facebook. My document begins the following way: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:fb="http://www.facebook.com/2008/fbml"> <head><title>Appname</title> </head> <body> <script src="http://static.ak.connect.facebook.com/js/api_lib/v0.4/FeatureLoader.js.php/de_DE" type="text/javascript"></script> And ends likes this: <script type="text/javascript"> FB_RequireFeatures(['XFBML','CanvasUtil'], function(){ FB.init("<?php echo $config->appapikey; ?>", "/app/xd_receiver.htm"); FB.CanvasClient.startTimerToSizeToContent(); }); </script> </body> </html> Also the file xd_receiver.htm is loaded as I can see in Firebug. But my problem is that for example the request-form is not loaded. My code: <fb:serverFbml> <script type="text/fbml"> <fb:fbml> <fb:request-form method="post" action="<?php echo $config->site; ?>index.php" type="appname" invite="true" target="_top" content="content"> <fb:multi-friend-selector actiontext="text" rows="3" showborder="true" target="_top"/> </fb:request-form> </fb:fbml> </script> </fb:serverFbml> I can see the code with Firebug but the form ist not displayed by Facebook. 2 or 3 weeks ago it was displayed but in this time I had the tags </fb:fbml> </script> </fb:serverFbml> arround my complete text in the body. 2 weeks ago I had the the problem that nothing any more was displayed. After I removed the tags my app is displayed but not the form. I am searchign the web vor 1 week now and read many Threads about FBML and XFBML in Facebook but nothing worked for me. So thank you in advance for help.

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• How do you write Valid XHTML 1.0 Strict code when you are using javascript to fill an element that r

  - by Tim Visher

  I'm running my site through the W3C's validator trying to get it to validate as XHTML 1.0 Strict and I've gotten down to a particularly sticky (at least in my experience) validation error. I'm including certain badges from various services in the site that provide their own API and code for inclusion on an external site. These badges use javascript (for the most part) to fill an element that you insert in the markup which requires a child. This means that in the end, perfectly valid markup is generated, but to the validator, all it sees is an incomplete parent-child tag which it then throws an error on. As a caveat, I understand that I could complain to the services that their badges don't validate. Sans this, I assume that someone has validated their code while including badges like this, and that's what I'm interested in. Answers such as, 'Complain to Flickr about their badge' aren't going to help me much. An additional caveat: I would prefer that as much as possible the markup remains semantic. I.E. Adding an empty li tag or tr-td pair to make it validate would be an undesirable solution, even though it may be necessary. If that's the only way it can be made to validate, oh well, but please lean answers towards semantic markup. As an example: <div id="twitter_div"> <h2><a href="http://twitter.com/stopsineman">@Twitter</a></h2> <ul id="twitter_update_list"> <script type="text/javascript" src="http://twitter.com/javascripts/blogger.js"></script> <script type="text/javascript" src="http://twitter.com/statuses/user_timeline/stopsineman.json?callback=twitterCallback2&amp;count=1"></script> </ul> </div> Notice the ul tags wrapping the javascript. This eventually gets filled in with lis via the script, but to the validator it only sees the unpopulated ul. Thanks in advance!

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• jQuery(document).ready doesn't run under IIS7

  - by gsiler

  To simplify this test case, I created a new default .NET MVC project in Visual Studio 2010, and added the following code to the HTML header in Site.Master: <script type="text/javascript" src="../../Scripts/jquery-1.4.1.js"></script> <script type="text/javascript"> jQuery(document).ready(function () { alert('jQuery document ready'); }); </script> This works as expected in the .NET development server. However, when deployed to IIS7, the jQuery(document).ready function is not executed. Needless to say, my actual application is much more complicated. This eliminates all "suspects" except IIS7 deployment. Any thoughts/suggestions?

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• SQL SERVER – Repair a SQL Server Database Using a Transaction Log Explorer

  - by Pinal Dave

  In this blog, I’ll show how to use ApexSQL Log, a SQL Server transaction log viewer. You can download it for free, install, and play along. But first, let’s describe some disaster recovery scenarios where it’s useful. About SQL Server disaster recovery Along with database development and administration, you must work on a good recovery plan. Disasters do happen and no one’s immune. What you can do is take all actions needed to be ready for a disaster and go through it with minimal data loss and downtime. Besides creating a recovery plan, it’s necessary to have a list of steps that will be executed when a disaster occurs and to test them before a disaster. This way, you’ll know that the plan is good and viable. Testing can also be used as training for all team members, so they can all understand and execute it when the time comes. It will show how much time is needed to have your servers fully functional again and how much data you can lose in a real-life situation. If these don’t meet recovery-time and recovery-point objectives, the plan needs to be improved. Keep in mind that all major changes in environment configuration, business strategy, and recovery objectives require a new recovery plan testing, as these changes most probably induce a recovery plan changing and tweaking. What is a good SQL Server disaster recovery plan? A good SQL Server disaster recovery strategy starts with planning SQL Server database backups. An efficient strategy is to create a full database backup periodically. Between two successive full database backups, you can create differential database backups. It is essential is to create transaction log backups regularly between full database backups. Keep in mind that transaction log backups can be created only on databases in the full recovery model. In other words, a simple, but efficient backup strategy would be a full database backup every night, a transaction log backup every hour, or every 15 minutes. The frequency depends on how much data you can afford to lose and how busy the database is. Another option, instead of creating a full database backup every night, is to create a full database backup once a week (e.g. on Friday at midnight) and differential database backup every night until next Friday when you will create a full database backup again. Once you create your SQL Server database backup strategy, schedule the backups. You can do that easily using SQL Server maintenance plans. Why are transaction logs important? Transaction log backups contain transactions executed on a SQL Server database. They provide enough information to undo and redo the transactions and roll back or forward the database to a point in time. In SQL Server disaster recovery situations, transaction logs enable to repair a SQL Server database and bring it to the state before the disaster. Be aware that even with regular backups, there will be some data missing. These are the transactions made between the last transaction log backup and the time of the disaster. In some situations, to repair your SQL Server database it’s not necessary to re-create the database from its last backup. The database might still be online and all you need to do is roll back several transactions, such as wrong update, insert, or delete. The restore to a point in time feature is available in SQL Server, but for large databases, it is very time-consuming, as SQL Server first restores a full database backup, and then restores transaction log backups, one after another, up to the recovery point. During that time, the database is unavailable. This is where a SQL Server transaction log viewer can help. For optimal recovery, besides having a database in the full recovery model, it’s important that you haven’t manually truncated the online transaction log. This ensures that all transactions made after the last transaction log backup are still in the online transaction log. All you have to do is read and replay them. How to read a SQL Server transaction log? SQL Server doesn’t provide an option to read transaction logs. There are several SQL Server commands and functions that read the content of a transaction log file (fn_dblog, fn_dump_dblog, and DBCC PAGE), but they are undocumented. They require T-SQL knowledge, return a large number of not easy to read and understand columns, sometimes in binary or hexadecimal format. Another challenge is reading UPDATE statements, as it’s necessary to match it to a value in the MDF file. When you finally read the transactions executed, you have to create a script for it. How to easily repair a SQL database? The easiest solution is to use a transaction log reader that will not only read the transactions in the transaction log files, but also automatically create scripts for the read transactions. In the following example, I will show how to use ApexSQL Log to repair a SQL database after a crash. If a database has crashed and both MDF and LDF files are lost, you have to rely on the full database backup and all subsequent transaction log backups. In another scenario, the MDF file is lost, but the LDF file is available. First, restore the last full database backup on SQL Server using SQL Server Management Studio. I’ll name it Restored_AW2014. Then, start ApexSQL Log It will automatically detect all local servers. If not, click the icon right to the Server drop-down list, or just type in the SQL Server instance name. Select the Windows or SQL Server authentication type and select the Restored_AW2014 database from the database drop-down list. When all options are set, click Next. ApexSQL Log will show the online transaction log file. Now, click Add and add all transaction log backups created after the full database backup I used to restore the database. In case you don’t have transaction log backups, but the LDF file hasn’t been lost during the SQL Server disaster, add it using Add.   To repair a SQL database to a point in time, ApexSQL Log needs to read and replay all the transactions in the transaction log backups (or the LDF file saved after the disaster). That’s why I selected the Whole transaction log option in the Filter setup. ApexSQL Log offers a range of various filters, which are useful when you need to read just specific transactions. You can filter transactions by the time of the transactions, operation type (e.g. to read only data inserts), table name, SQL Server login that made the transaction, etc. In this scenario, to repair a SQL database, I’ll check all filters and make sure that all transactions are included. In the Operations tab, select all schema operations (DDL). If you omit these, only the data changes will be read so if there were any schema changes, such as a new function created, or an existing table modified, they will be ignored and database will not be properly repaired. The data repair for modified tables will fail. In the Tables tab, I’ll make sure all tables are selected. I will uncheck the Show operations on dropped tables option, to reduce the number of transactions. Click Next. ApexSQL Log offers three options. Select Open results in grid, to get a user-friendly presentation of the transactions. As you can see, details are shown for every transaction, including the old and new values for updated columns, which are clearly highlighted. Now, select them all and then create a redo script by clicking the Create redo script icon in the menu.   For a large number of transactions and in a critical situation, when acting fast is a must, I recommend using the Export results to file option. It will save some time, as the transactions will be directly scripted into a redo file, without showing them in the grid first. Select Generate reconstruction (REDO) script , change the output path if you want, and click Finish. After the redo T-SQL script is created, ApexSQL Log shows the redo script summary: The third option will create a command line statement for a batch file that you can use to schedule execution, which is not really applicable when you repair a SQL database, but quite useful in daily auditing scenarios. To repair your SQL database, all you have to do is execute the generated redo script using an integrated developer environment tool such as SQL Server Management Studio or any other, against the restored database. You can find more information about how to read SQL Server transaction logs and repair a SQL database on ApexSQL Solution center. There are solutions for various situations when data needs to be recovered, restored, or transactions rolled back. Reference: Pinal Dave (http://blog.sqlauthority.com)Filed under: PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL

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• How to propertly reference a namespace for Microsoft.Sdc.Tasks.XmlFile.GetValue

  - by æther

  Hi, i want to use MSBuild to insert a custom xml element into web.config. After looking up online, i found such solution: 1) Store element in the .build file in projectextensions <ProjectExtensions> <CustomElement name="CustomElementName"> ... </CustomElement> </ProjectExtensions> 2) Retrieve the element with GetValue <Target name="ModifyConfig"> <XmlFile.GetValue Path="$(MSBuildProjectFullPath)" XPath="Project/ProjectExtensions/CustomElement[@name='CustomElementName']"> <Output TaskParameter="Value" PropertyName="CustomElementProperty"/> </XmlFile.GetValue> </Target> This will not work as i need to reference a namespace the .build project is using for it to find the needed element (checked the .build file with XPath Visualizer). So, i look up for a further solution and come to this: <ItemGroup> <XmlNamespace Include="MSBuild"> <Prefix>msb</Prefix> <Uri>http://schemas.microsoft.com/developer/msbuild/2003</Uri> </XmlNamespace> </ItemGroup> <Target name="ModifyConfig"> <XmlFile.GetValue Path="$(MSBuildProjectFullPath)" Namespaces="$(XmlNamespace)" XPath="/msb:Project/msb:ProjectExtensions/msb:CustomElement[@name='CustomElementName']" > <Output TaskParameter="Value" PropertyName="CustomElementProperty"/> </XmlFile.GetValue> </Target> But for some reason namespace is not recognized - MSBuild reports the following error: C:...\mybuild.build(53,9): error : A task error has occured. C:...\mybuild.build(53,9): error : Message = Namespace prefix 'msb' is not defined. I tried some variations of referencing it differently but none work, and there is not much about propertly referencing those namespaces online also. Can you tell me what am i doing wrong and how to do it propertly?

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