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  • jQuery - Set selected value of all dropdowns on page

    - by Tgibson
    Hello Frieds, I have another jQuery question. For a user control with lots of database activity, I would like to use jQuery to set the selected values of all of the dropdowns to their "current" value. I want to do this to make the page appear to have finished the database call. My jQuery skill is not the best, but I believe I need to use the pageLoad(). And since each dropdown is inside of a user control I can search for those dropdowns beginning with "usrControl" $('select[id ^="usrControl"'].each(function(){ var selectedValue = $(this).val() $(this).val(selectedValue) }); Something like this is what I have in mind. Thanks

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  • ypeError: Result of expression 'printWindow' [undefined] is not an object.

    - by orangebrainer
    I'm trying to create hidden iframes in my page dynamically to load 3 other pages so that i can grab all the HTML and combine them into 1 in a new window. However i'm stuck at this. tHe frames are created fine. But whenever the javascript runs to the part of openNewWindow(); { var printWindow = window.open("",""); printWindow.document.open(); printWindow.document.write(HTMLfromFrames); printWindow.document.close(); } i get this error: TypeError: Result of expression 'printWindow' [undefined] is not an object. but if i generate a button to call this function seperately, it works fine. however i need it to run all in one click event Anybody as any idea what's wrong? Thanks!

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  • JavaScript not changing display type or color in IE

    - by user445359
    I am trying to switch a series of blocks between "none" and "block" based on the OnMouseOver property and to change the title of the selected list to yellow at the same time. The JavaScript code I have for this is: function switchCat(cat) { var uls = document.getElementsByClassName('lower-ul'); var titles = document.getElementsByClassName('lower-cat-title'); for (var i=0;i<uls.length;i++) { uls[i].style.display = 'none'; titles[i].style.color = 'white'; } if (cat != -1) { var wanted = document.getElementById('lower-cat-'+cat); var wantedTitle = document.getElementById('lower-cat-title-'+cat); wanted.style.display = 'block'; wantedTitle.style.color = 'yellow'; } } It works with Chrome, Opera, and Firefox, however, it does not work with IE. When I test it in IE I get the error "Object doesn't support this property or method." Does anyone know what I am doing wrong?

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  • Using traversal by pointer to check whether a string is repeated

    - by Bob John
    bool repeat_char(char *s, int n); //R: s is a C-string of at least n non-NUL characters and n > 0 //E: returns true if the first n characters are fully repeated throughout the string s, false // otherwise. I'm having trouble implementing this function using traversal by pointer. I was thinking that I could extract the first n characters from s, then use that in a comparison with s, but I'm not sure how I could do that. If I'm traversing through s one character at a time, how can I check that it matches a block of text, such as the first n characters of s? Thanks!

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  • Why does my Image stretch when I crop it?

    - by q234e
    I am using the following code snippet in order to crop a image? function crop($width,$height) { $new_image = imagecreatetruecolor($width, $height); imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $this->getWidth(), $this->getHeight(), $width, $height ); $this->image = $new_image; } Here, $this->image is the original image $this->getWidth() and $this->getHeight() holds the original dimensions of the picture, where as $width and $height, is the crop area. But for some reason, the crop image is resized(we can almost say it is resized). How to fix this?

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  • How to find out how namespace got polluted?

    - by dehmann
    Consider the following little piece of code: // all of these include other headers, lots of code: #include "myheader1.h" #include "myheader2.h" #include <string> void foo() { string s("hello world"); // oh no, why does this compile?? } This compiles, so obviously some of the recursively included header files has a using namespace std; somewhere. How would you go about finding out where that offending line of code is? Just using grep on all header files won't really work because that statement is often used inside a function, where it is safe and won't pollute the rest of the code.

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  • php: possible to convert array of numbers to 'from' and 'to' pairs where consecutive?

    - by Haroldo
    I have an array of timestamps referring to the days when a holiday home is booked. each timestamp is a round day. I want to turn this into an array of 'begins' and 'ends' pairs for consecutive dates Are there any php functions I should be aware of for writing this function? Or does anyone have any pointers for this kind of thing? thanks! edit: example array: Array ( [0] => 1273536000 [1] => 1273622400 [2] => 1273708800 [3] => 1273795200 [4] => 1273881600 [5] => 1273968000 [6] => 1274054400 [7] => 1274140800 [8] => 1274227200 ) where a day = 86400 (seconds)

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  • animate each child jquery

    - by Martavis P.
    It's amazing how simple this should be but I can't get it to work. I'm looking to animate a set of divs one at a time. I am using animate.css for those familiar with it. I thought I may have found the answer here but jsFiddle is not working at the moment. Anywho, the code is $('.elements').each(function(i) { $(this).addClass('animated slideInLeft').delay(500); }); The problem is that when I debug and step through each element, the animation is happening for each element but when I let it run, it appears to all do it at once. What is needed to actually show the animation one at a time? Thanks EDIT: jsFiddle is back up and that link provided below did not help. The answer did not include looping through elements, but looping the animation itself. EDIT 2 Here is a Fiddle to play with if you guys need one.

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  • $.ajax + authentication + `@` in username

    - by Koning Baard XIV
    I am creating a web app which uses jQuery to authenticate: $.ajax({ url: "/session/create?format=json", type: "GET", dataType: "json", cache: false, username: $("#signin-email").val(), password: $("#signin-password").val(), success: function(data) { if(data.success) { success = true; } } }); The problem is that the code only makes the AJAX-request when the username does not include things like an @, which is required in my app. Can anyone help me with how I can do this? I do not mind changing the back-end a little bit, but requiring users to have an @-less email is not an option. Oh, my back-end is a Ruby-on-Rails app

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  • [Android] How to launch an Activity without a UI?

    - by fjmustak
    Is it in any way possible to launch an activity from the main function without having a UI? i.e. is there a way to create a sort of "wrapper" around another activity, i.e. by launching the main activity, it takes you to another activity automatically. If that is not possible, is there a way to remove the main activity from the stack so that clicking the back button does not take you to a blank UI? Here's an example of what I'm trying to do: public class WrapperActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); final Intent intent = new Intent(Intent.ACTION_DIAL, Uri.parse("tel:555-1212")); startActivity(intent); } }

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  • Can someone port this to C?

    - by Tech163
    I've spent the last few hours trying to port this to C, with no success. Can someone please help? function zerofill($a, $b) { $z = hexdec(80000000); if ($z & $a) { $a = ($a>>1); $a &= (~$z); $a |= 0x40000000; $a = ($a>>($b-1)); } else { $a = ($a>>$b); } return $a; }

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  • Prove 2^sqrt(log(n))= O(n^a)

    - by user1830621
    I posted a question similar to this earlier, although it seemed like it was much easier. I know the underlying principle of Big-O notation says that to prove that 2^sqrt(log(n)) is O(n^a), there must exist a positive value c for which c(n^a) = 2^sqrt(log(n)) for all values n = N. c*n^a >= 2^sqrt(log(n)) c >= 2^sqrt(log(n)) / n^a This number will always be positive so long as n 0. I suppose I could make N = 1 just to be safe. c = 2^sqrt(log(n)) / n^a N = 1 c*n^a = 2^sqrt(log(n) <= 2^log(n) for all values of n >= 1 Now, I know this is incorrect, because I could just as easily claim that the function 2^sqrt(log(n)) is O(n)...

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  • Dismissing the keyboard in a UIScrollView

    - by Nicholas1024
    Alright, I have a couple of UITextFields and UITextViews inside a UIScrollView, and I'd like to set the keyboard to disappear whenever the scrollview is touched or scrolled (except when you touch down inside the text field/view, of course). My current attempt at doing this is replacing the UIScrollView with a subclass, and setting it to call a removeKeyboard function (defined inside the main view controller) inside the touchesBegan method. However, this only removes the keyboard for a normal touch, not when the view is simply scrolled. So, what's the best way to remove the keyboard inside a UIScrollView? Thanks in advance for your help.

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  • "Method name expected" error when trying add a handler method to a delegate - C#

    - by zakplayyy
    I keep getting the error "Method name expected" when trying add the a method to a delegate. I have a delegate which is invoked when ever my game ends. The function I'm trying to add to the delegate stops a countdown from flashing (the method is in a static class). I've searched about and I'm still unsure why its not working. Here is the line causing the error: LivesManager.gameEnded += new LivesManager.EndGame(CountdownManager.DisableFlashTimer(this)); The this passes the current form to the method so it can disable the timer flash on the form. I have added methods from static classes to the same delegate before and it works fine, the only difference is that I'm passing the form as a paramater and then it doesn't like it. Is there any way to pass the form to the method without the error? Thanks in advance :)

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  • Not working for single click..Jquery Grid

    - by kumar
    $("#table_id").click(function(e) { var row = jQuery(e.target || e.srcElement).parent(); $("#table_id").bind('click', loaddata); name= row.attr("id"); }); loaddata is the funcation I am calling on click on each row.. but this cilck event is working for double click.. I mean when you double click its working fyn.. but i need it to work for single click on the row.. is that anything I am doing wrong here? thanks

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  • Accessing local variable doesn't improve performance

    - by NicMagnier
    The short version Why is this code: var index = (Math.floor(y / scale) * img.width + Math.floor(x / scale)) * 4; More performant than this one? var index = Math.floor(ref_index) * 4; The long version This week, the author of Impact js published an article about some rendering issue: http://www.phoboslab.org/log/2012/09/drawing-pixels-is-hard In the article there was the source of a function to scale an image by accessing pixels in the canvas. I wanted to suggest some traditional ways to optimize this kind of code so that the scaling would be shorter at loading time. But after testing it my result was most of the time worst that the original function. Guessing this was the JavaScript engine that was doing some smart optimization I tried to understand a bit more what was going on so I did a bunch of test. But my results are quite confusing and I would need some help to understand what's going on. I have a test page here: http://www.mx981.com/stuff/resize_bench/test.html jsPerf: http://jsperf.com/local-variable-due-to-the-scope-lookup To start the test, click the picture and the results will appear in the console. There are three different versions: The original code: for( var y = 0; y < heightScaled; y++ ) { for( var x = 0; x < widthScaled; x++ ) { var index = (Math.floor(y / scale) * img.width + Math.floor(x / scale)) * 4; var indexScaled = (y * widthScaled + x) * 4; scaledPixels.data[ indexScaled ] = origPixels.data[ index ]; scaledPixels.data[ indexScaled+1 ] = origPixels.data[ index+1 ]; scaledPixels.data[ indexScaled+2 ] = origPixels.data[ index+2 ]; scaledPixels.data[ indexScaled+3 ] = origPixels.data[ index+3 ]; } } jsPerf: http://jsperf.com/so-accessing-local-variable-doesn-t-improve-performance One of my attempt to optimize it: var ref_index = 0; var ref_indexScaled = 0 var ref_step = 1 / scale; for( var y = 0; y < heightScaled; y++ ) { for( var x = 0; x < widthScaled; x++ ) { var index = Math.floor(ref_index) * 4; scaledPixels.data[ ref_indexScaled++ ] = origPixels.data[ index ]; scaledPixels.data[ ref_indexScaled++ ] = origPixels.data[ index+1 ]; scaledPixels.data[ ref_indexScaled++ ] = origPixels.data[ index+2 ]; scaledPixels.data[ ref_indexScaled++ ] = origPixels.data[ index+3 ]; ref_index+= ref_step; } } jsPerf: http://jsperf.com/so-accessing-local-variable-doesn-t-improve-performance The same optimized code but with recalculating the index variable each time (Hybrid) var ref_index = 0; var ref_indexScaled = 0 var ref_step = 1 / scale; for( var y = 0; y < heightScaled; y++ ) { for( var x = 0; x < widthScaled; x++ ) { var index = (Math.floor(y / scale) * img.width + Math.floor(x / scale)) * 4; scaledPixels.data[ ref_indexScaled++ ] = origPixels.data[ index ]; scaledPixels.data[ ref_indexScaled++ ] = origPixels.data[ index+1 ]; scaledPixels.data[ ref_indexScaled++ ] = origPixels.data[ index+2 ]; scaledPixels.data[ ref_indexScaled++ ] = origPixels.data[ index+3 ]; ref_index+= ref_step; } } jsPerf: http://jsperf.com/so-accessing-local-variable-doesn-t-improve-performance The only difference in the two last one is the calculation of the 'index' variable. And to my surprise the optimized version is slower in most browsers (except opera). Results of personal testing (not the jsPerf tests): Opera Original: 8668ms Optimized: 932ms Hybrid: 8696ms Chrome Original: 139ms Optimized: 145ms Hybrid: 136ms Safari Original: 433ms Optimized: 853ms Hybrid: 451ms Firefox Original: 343ms Optimized: 422ms Hybrid: 350ms After digging around, it seems an usual good practice is to access mainly local variable due to the scope lookup. Because The optimized version only call one local variable it should be faster that the Hybrid code which call multiple variable and object in addition to the various operation involved. So why the "optimized" version is slower? I thought that it might be because some JavaScript engine don't optimize the Optimized version because it is not hot enough but after using --trace-opt in chrome, it seems all version are properly compiled by V8. At this point I am a bit clueless and wonder if somebody would know what is going on? I did also some more test cases in this page: http://www.mx981.com/stuff/resize_bench/index.html

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  • In a C++ template, is it allowed to return an object with specific type parameters?

    - by nieldw
    When I've got a template with certain type parameters, is it allowed for a function to return an object of this same template, but with different types? In other words, is the following allowed? template<class edgeDecor, class vertexDecor, bool dir> Graph<edgeDecor,int,dir> Graph<edgeDecor,vertexDecor,dir>::Dijkstra(vertex s, bool print = false) const { /* Construct new Graph with apropriate decorators */ Graph<edgeDecor,int,dir> span = new Graph<edgeDecor,int,dir>(); /* ... */ return span; }; If this is not allowed, how can I accomplish the same kind of thing?

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  • Byte manipulation in PHP

    - by Michael Angstadt
    In PHP, if you have a variable with binary data, how do you get specific bytes from the data? For example, if I have some data that is 30 bytes long, how do I get the first 8 bytes? Right now, I'm treating it like a string, using the substr() function: $data = //... $first8Bytes = substr($data, 0, 8); Is it safe to use substr with binary data? Or are there other functions that I should be using? Thanks.

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  • Simple accordion menu (jQuery)

    - by Nimbuz
    // ACCORDION $('.accordion .answer').hide(); // hide all $('.accordion .question').click(function(){ $('.accordion .answer').slideUp(); // hide all open $(this).addClass('active').next().slideDown(); // show the anwser return false; }); HTML: <dl class="accordion"> <dt class="question">question</dt> <dd class="answer">answer</dd> <dt class="question">question</dt> <dd class="answer">answer</dd> </dl> ... works, but the 'active' class is removed from inactive question elements and atleast one of the answer remains open, all answers should be able to close. Thanks!

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  • ActionScript - One Button Limit (Exclusive Touch) For Mobile Devices?

    - by TheDarkIn1978
    two years ago, when i was developing an application for the iPhone, i used the following built-in system method on all of my buttons: [button setExclusiveTouch:YES]; essentially, if you had many buttons on screen, this method insured that the application wouldn't be permitted do crazy things when several button events firing at the same time. problematic: ButtonA and ButtonB are available. each button has a mouse up event which fire a specific reorganization/layout of the UI. if both button's events are fired at the same time, their events will likely conflict, causing a strange new layout, perhaps a runtime error. solution: application buttons cancel any current pending mouse up events when said button enters mouse down. private function mouseDownEventHandler(evt:MouseEvent):void { //if other buttons are currently in a mouse down state ready to fire //a mouse up event, cancel them all here. } of course it's simple to manually handle this if there are only a few buttons on stage, but managing buttons becomes more and more complicated / bug-prone if there are several / many buttons available. is there a convenience method available in AIR specifically for this functionality?

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  • How can I write my code to attempt a database action but continue executing code on failure?

    - by Chris
    Simple question I guess, I want to use PHP to write an update to an existing row in my database, if it doesn't happen I want to log the failure but continue executing the code. While it would be nice to have records of failures to track down issues, that the update failed isn't that important to my user, nor will it affect the running of any other code; the query is simply for a 'cosmetic' but entirely unnecessary piece of information. My database class's query function is set to die on failure, could I modify that or is there another way of doing it without altering my standard query code?

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  • Secure Menu Items Based on User

    - by Mike Wills
    On this winform application I am writing, I want to secure one menu item from most users. It runs a month-end and cannot be easily backed out if accidentally run. The menu option opens up a window to prompt the user for some information before processing. I don't care where exactly I do the check, but I want to be sure only certain users can run this function. A Google search (on my question title above) didn't turn up anything obvious. Can anyone point me in a direction to pick up who is signed into Windows and how to check if they are authorized?

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  • Simple: replace div with ajax content (jquery)

    - by user469110
    I followed this thread. I now have: <a href="#" onclick="$('#gc').load('test');">reload</a>... </span> <div id="gc"> empty </div> This is what I am getting: Uncaught exception: TypeError: Cannot convert '$('#gc')' to object Error thrown at line 1, column 0 in <anonymous function>(event): $('#gc').load('test'); What is that? I thought I would be able to select a div and replace the contents with load()?

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  • is it good to write multiple time(separate) <script type="text/javascript"> on one php page?

    - by I Like PHP
    i m using many tiny java script code at one php page, i always write java script code in below style <script type="text/javascript"> // <![CDATA[ ----code 1--------- // ]]> </script> <script type="text/javascript"> // <![CDATA[ ----code 2----- // ]]> </script> <script type="text/javascript"> // <![CDATA[ $(document).ready.(function(){ }); // ]]> </script> i want to know that is it good practice to write separate <script type="text/javascript"></script> on same page or we have to write all java script code under one time declaration

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