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• How do I manipulate a tree of immutable objects?

  - by Frederik

  I'm building an entire application out of immutable objects so that multi-threading and undo become easier to implement. I'm using the Google Collections Library which provides immutable versions of Map, List, and Set. My application model looks like a tree: Scene is a top-level object that contains a reference to a root Node. Each Node can contain child Nodes and Ports. An object graph might look like this: Scene | +-- Node | +-- Node | +- Port +-- Node | +- Port +- Port If all of these objects are immutable, controlled by a top-level SceneController object: What is the best way to construct this hierarchy? How would I replace an object that is arbitrarily deep in the object tree? Is there a way to support back-links, e.g. a Node having a "parent" attribute?

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• How to print a variable in reversed byte order in Perl?

  - by jth

  Hi, I'am trying to convert the variable $num into its reverse byte order and print it out. This is what I have done so far: my $num=0x5514ddb7; my $s=pack('I!',$num); print "$s\n"; He prints it out as some non-printable characters and in a hex editor it looks right, but how can I get it readable on the console? Already tried print sprintf("%#x\n",$s); but he complains about an non-numeric argument, so I think pack returns a string. Any ideas how can I print out `0xb7dd1455 on the console, based on $num?

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• Sax Parsing strange element with nokogiri

  - by SHUMAcupcake

  I want to sax-parse in nokogiri, but when it comes to parse xml element that have a long and crazy xml element name or a attribute on it.. then everthing goes crazy. Fore instans if I like to parse this xml file and grab all the title element, how do I do that with nokogiri-sax. <titles> <title xml:lang="sv">Arkivvetenskap</title> <title xml:lang="en">Archival science</title> </titles>

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• HTML chrome:// page with select box, onChange failing

  - by Noitidart

  I have a html page. It is chrome://. I have a select box. Giving it the oncommand attribute won't work. So I have to use onchange however you have the typical problem with onchange where it doesnt work if user uses the keyboard arrows, or letters of items to change things. Is there anyway to attach onCommand to my select box? I want to avoid to use onkeyup as then i have to to validation to see if it really changed (which would require me saving previous values).

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• What workflow should I use for JavaScript editing?

  - by Patrick

  Warning: I have very little JavsScript experience. In my past programming experience, I usually have a standalone interpreter/compiler, a text editor and a command line to compile/run my software or my tests (I love test driven development). I really like it this way, since I have the feeling of being in complete control over the tools. However, editing JavaScript I need to put statements in a text file , open my web browser and click on reload. I don't feel comfortable with it, as I cannot really see what is going on (besides some alert boxes). Can you suggest me (I'm on a Mac) another workflow? Perhaps with a debugger? Is there a standalone JavaScript interpreter?

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• Get data from database with two conditions in one list

  - by Kreeki

  Hi coders out there, I'm new to this. I have a (sqlite3, but with ActiveRecord it doesn't matter) table called Messages and a model called Message. I want to find all messages in database that have user_id or reciever_id equal to the object user and his attribute id (for short user.id). I know it's probably just one simple line of code, but I wanna do it the right "rails" way and I don't have much experience with this. I'm using Rails 3. Thanks for any help. Cheers

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• Crystal Reports: Cannot insert some fields from Field Explorer to Report

  - by zdhacz

  I have an existing report (Crystal Reports 11) that is based on two Oracle views. I have made 'Verify database' already, it's done and up to date. My problem is that I can insert some fields to report but some other I cannot. For example: field Name (string(35)) is ok, but similar field Compamy (string(20)) I cannot insert to Report. Drag&drop does not work and small button "Insert to Report" in Field Explorer is disabled too. Next symptom: when I try to use functionless field (e.g. Company) in Record Selection Formula Editor, Crystal Reports crash. There is any way how to add these fields into Report? Thanks

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• ASP/HTML problem with spaces and monofonts

  - by nickik

  I have a ASP has a Function that converts ä to &auml so far so good. I have lets say space for 10 char's if there are more cut them of if there are less fill the space up with &nbsp's. . Like this: test &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp but if i say "täst" it does this: te &auml t &nbsp It interprets the &auml not as one char it looks at it as 6 chars. Is there a clever way around that? This problem messes up my design because I need the right count of spaces. The whole thing goes into a big select box. Of you have to add a ; at the end of ever &... I could add them because the Editor would really interprt them.

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• Importing data from a text file using python

  - by Will

  I have a text file containing data in rows and columns (~17000 rows in total). Each column is a uniform number of characters long, with the 'unused' characters filled in by spaces. For example, the first column is 11 characters long, but the last four characters in that column are always spaces (so that it appears to be a nice column when viewed with a text editor). Sometimes it's more than four if the entry is less than 7 characters. The columns are not otherwise separated by commas, tabs, or spaces. They are also not all the same number of characters (the first two are 11, the next two are 8 and the last one is 5 - but again, some are spaces). What I want to do is import the entires (which are numbers) in the last two columns if the second column contains the string 'OW' somewhere in it. Any help would be greatly appreciated.

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• AJAX Autocomplete appears at a random vertical position, not touching the textbox

  - by Tim

  Hi, I am using the AJAX Autocomplete extender for ASP.NET 2. Everything works fine...I am calling a webservice which gets me the values to fill the drop down with after 3 letters are typed into certain es. I have set the maxheight attribute and am using a scrollbar in case there are more entries than would fit that height. However, I notice that in some cases, the drop down appears at a random position on the screen, i.e. rather than connected to the relevant textbox, sometimes it appears with its entries above the textbox, not touching it at all. Sometimes it would have just one entry and it would appear in the middle of the screen vertically above the textbox it is associated to. Is there a reason why this is happening?

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• In Visual Studio 2010, intellisense isn't showing for long method signatures

  - by sohtimsso1970

  The problem is exactly as asked in the question title. When I'm typing in the text editor and referencing a public method that has a long signature (lots of parameters, usually 10 or more) the intellisense just stops working. It will sometimes flicker; other times it will not show at all. Only seen this happen with C#, but I don't use anything else. It might happen in VB too. Don't know. Anyone else seeing this? I've Googled for an hour but can't seem to iron it out. I've restarted VS, rebooted the machine, enabled/disabled intellisense in Tools - Options. NOTHING works.

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• Setting custom control properties

  - by Rob

  I though it would be very simple but I can not get it today. I have a user control, with a grid control contained in it. public Unit Width { get { return CustomerGrid.Width; } set { CustomerGrid.Width = value; } } I expose the width property and when I set it in the designer it works at run-time but not design time. What class do I inherit from or method to override to get my controls to function at design time. Note I tried to inherit from WebControl but got the message Make sure that the class defined in this code file matches the 'inherits' attribute, and that it extends the correct base class

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• How to get the class of an input inside a jQuery each loop?

  - by Paul Atkins

  Hi, I have function which appends inputs inside a list item when a link is clicked. I then loop through these inputs using an each loop using the code below. It is working correctly as shown, however instead of using field.name I want to use the class of the input as the array key but when i try to do this the class is shown as undefined. Here is the code I am currently using: var values = {}; $.each($('li :input').serializeArray(), function(i, field) { values[field.name] = field.value; }); Here is the code I have inside the list item once I have appended the hidden inputs using jQuery append: <li><input type="hidden" name="group" class="group" value="2"/><input type="hidden" name="condition" class="condition" value="isany"/><input type="hidden" name="value" class="value" value="1,2"/></li> I can get the name attribute fine but class is always undefined. Could anybody help with this?

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• how to make text appear when you hover at a particular area?

  - by Michael

  I'm mainly using c++ win32 API project and the question is asked keeping in mind: When you use microsoft visual studio 2010 visual c++ editor and you minimize any function, then ahead of the function you get a box; hovering over which you see the entire function. How to implement this in c++ win32 API ? for ex- when a win32 project is created in vs2010, and empty project checkbox is unchecked then by default you get a code which after running produces a window which has a menu bar containing File an Help. Now i want some text to come when i hover over each of them. I do not want a code just a hint how it can be done. Thanks in advance.

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• jQuery DIV click, with anchors

  - by ANaimi

  To make click-able divs, I do: <div class="clickable" url="http://google.com"> blah blah </div> and then $("div.clickable").click( function() { window.location = $(this).attr("url"); }); I don't know if this is the best way, but it works perfectly with me, except for one issue: If the div contains a click-able element, such as <a href="...">, and the user clicks on the hyperlink, both the hyperlink and div's-clickable are called This is especially a problem when the anchor tag is referring to a javascript AJAX function, which executes the AJAX function AND follows the link in the 'url' attribute of the div. Anyway around this?

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• Content Assist problem in eclipse 3.5

  - by user361996

  I've got a Content Assist problem in eclipse 3.5, which is eclipse-java-galileo-win32.zip. When I press Alt+/(I've changed Ctrl+Space to this) in Java Editor, no assistant tips are shown up. I've solved this problem and I'd like to share my experience. 1 Eclipse--Preferences--General--Keys; 2 Search 'Content Assist'; 3 You'll find that in 'When' Field, the default value is 'in dialogs and window', change it to 'Editing Java Source', then press 'OK' to save; I can not post a image, but here is a link: http://www.freeimagehosting.net/image.php?e0987ea847.png That's All.

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• How can I read out the CSS text via Javascript as defined in the stylesheet?

  - by Monokai

  I was thinking of using Javascript to automatically transform CSS3 attributes like border-radius, transform, box-shadow, etc. to their browser specific counterparts. I did some research and found that you can iterate over the stylesheets defined via document.styleSheets. You can find the CSS rules via document.styleSheets[0].cssRules[0].cssText. I want to modify the CSS rules that contain CSS3 attributes by injecting the browser specific attributes with the appropriate vendor-prefix, like -webkit-border-radius, moz-border-radius, etc. However, it seems that the cssText property is preprocessed in each browser, to filter out CSS attributes that it doesn't understand. That practically breaks this idea. Question: is there any way to retrieve the CSS text exactly as defined in the stylesheet? Or: is there another way to accomplish this via Javascript? I'd like to maintain clean CSS files without the need for defining each attribute multiple times for each specific browser.

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• Using cachedwithin attibute inside cfquery

  - by Jason

  When you use the cachedwithin attribute in a cfquery how does it store the query in memory. Does it store it by only the name you assign to the query? For example, if on my index page I cache a query for an hour and name it getPeople will a query with the same name on a different page (or the same page for that matter) use the cached results or does it use some better logic to decide if it is the same query? Also, if there is a variable in your query does the cache take into account the value of the variable?

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• Scalling connected lines

  - by Hristo

  Hello, I have some kind of a shape consisting of vertical, horizontal and diagonal lines. I have starting X,Y and ending X,Y (this is my input - just 2 points defining a line) of each line and I would like to make the whole shape scalable (just by changing the value of a scale ratio variable), so that I can still preserve the proper connection of the lines and the proportions as well. Just for getting a better idea of what I mean: it'd be as if I had the same lines in a vector editor. Would that be possible with an algorithm, and could you please, give me another possible solution if there is no such algorithm ? Thank you very much in advance!

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• Secure C# Assemblies from unauthorized Callers

  - by Creepy Gnome

  Is there any way to secure your assembly down to the class/property & class/method level to prevent the using/calling of them from another assembly that isn't signed by our company? I would like to do this without any requirements on strong naming (like using StrongNameIdentityPermission) and stick with how an assembly is signed. I really do not want to resort to using the InternalsVisibleTo attribute as that is not maintainable in a ever changing software ecosystem. For example: Scenario One Foo.dll is signed by my company and Bar.dll is not signed at all. Foo has Class A Bar has Class B Class A has public method GetSomething() Class B tries to call Foo.A.GetSomething() and is rejected Rejected can be an exception or being ignored in someway Scenario Two Foo.dll is signed by my company and Moo.dll is also signed by my company. Foo has Class A Moo has Class C Class A has public method GetSomething() Class C tries to call Foo.A.GetSomething() and is not rejected

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• ValidateRequest="false" doesn't work!!!

  - by Ivan90

  Hy guys, I am developing a personal blog in asp.net mvc 1.0! So, I need in some pages to disable validaterequest because, I have to insert html text! For example.. in the page "Insert Post", "Edit Post".. I need to insert html! I read on web that's necessary to disable validaterequest directly in page with attribute validaterequest = "false" or in webconfig file! I tryied all ways, but when I insert in my textarea html code, I get always the error of potential value dangerous! Any solutions?

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• Can I preload multiple video resources to load in the same HTML5 <video> element?

  - by Sergio1132

  I'm working out details on a web application which involves the sequential loading of a long series of (very short) video clips, one after the other, with occasional input from the user establishing new directions for which video clips to load. I would like to be able to have the browser preload the video clips five at a time. However, the way that we currently have the site working is by means of a single video element which is having its src attribute continually updated through JavaScript. So, my question is, is there a straightforward way I can get the browser to preload multiple video clips even though I am ultimately loading them all (one at a time) into the same video element? This is my first question here, so let me know if I could have phrased that better...

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• How can I fix this regex to allow a specific string?

  - by Sailing Judo

  This regex comes from Atwood and is used to filter out anchor tags with anything other than the href and a title: <a\shref="(\#\d+|(https?|ftp)://[-A-Za-z0-9+&@#/%?=~_|!:,.;]+)"(\stitle="[^"]+")?\s?> I need to allow am additional attribute that specifically matches: target="_blank". So the following url should be allowed: <a href="http://www.google.com" target="_blank"> I tried changing the pattern to these: <a\shref="(\#\d+|(https?|ftp)://[-A-Za-z0-9+&@#/%?=~_|!:,.;]+)"(\stitle="[^"]+")(\starget="_blank")?\s?> <a\shref="(\#\d+|(https?|ftp)://[-A-Za-z0-9+&@#/%?=~_|!:,.;]+)"(\stitle="[^"]+")(\starget=\"_blank\")?\s?> Clearly I don't know regex very well. How should the pattern be adjusted to allow the blank target and no other targets?

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• Fluent-NHibernate: How does one translate composite-element tag to fnh?

  - by epitka

  How do we express this in FNH? <class name="Order" .... > .... <set name="PurchasedItems" table="purchase_items" lazy="true"> <key column="order_id"> <composite-element class="Purchase"> <property name="PurchaseDate"/> <property name="Price"/> <property name="Quantity"/> <many-to-one name="Item" class="Item"/> <!-- class attribute is optional --> </composite-element> </set>

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• javascript get attribution from select

  - by Yongwei Xing

  Hi all <select id="test"> <option attribut="1">test 1</option> <option attribut="2">test 2</option> <option attribut="3">test 3</option> <option attribut="4">test 4</option> <option attribut="5">test 5</option> </select> I want to get the selected item's attribute, is there any simple way to do it. The native javascript is fine. Best Regards,

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