JQuery :: Continuation-style Programming / Are There Constraints On Fx Callbacks
Feb 18, 2011
The documentation on e.g. the fadeIn() method does not specify any constraints on the callback argument. Does that mean that 'anything will work'? Specifically, is recursion allowed?I want to know whether jQuery design has deliberately taken this into account. Yes, I can read the source code. No I don't plan to do so (for now), since I consider it an essential gap in the documentation.[code]
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Aug 10, 2011
I have:
<script id="foo" type="text/x-jquery-tmpl">
<p>${100 * parseInt(x)}</p>
</script>
When I do:
$('#foo').tmpl({'x':5}) // or '5'
[Code]...
I've been searching and everything I find says that ${} should be able to handle arbitrary expressions, but there seems to be some syntax magic/intolerance going on here.
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May 17, 2010
I'm having problems with callbacks in the code below:
$.ajax({
dataType : 'jsonp',
jsonpCallback : 'get_json',
success : function(d) { alert(d); },
error : function() { alert("ouch"); },
url : data_url
})}
I have verified that the server is returning valid json. My jsonpCallback is called, but neither the success nor the error callbacks are. I'm stumped by this.
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May 10, 2010
I am trying to execute slightly more than "Hello, world" using .ajax() specifically and with both a success and error callback. I have:
[Code]...
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Dec 21, 2010
how to use jQuery I created my own AutoComplete Textbox (although there is one in the jQueryUI Lib). The users types something in a textbox and after 3 characters, the getJSON method is beeing called. This processes the data by calling another site and after received the data, it displays the result in a div tag.If a user types something, it automatically searchs - my problem is the delay. Because if a user continuous, he will already receive (delayed) results - so far it works as designed. My question is, how can I stop the other callbacks of being processed and only receive and display the details of the last callback?
Attachments
AjaxSearch.txt
Size : 4.14 KB
Download : 306
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Jul 21, 2011
I'm using jQuery-1.6.2 and stumbled upon the problem that exceptions within AJAX callbacks are silently ignored:
$.ajax({
url: '/',
success: function() {
[code]....
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Jan 16, 2010
Really excited about the new 1.4 release. Looks like a lot of good stuff. Anyway, I've been using the json format to pass data back from the server and after upgrading to 1.4 I'm getting the parsererror, even when I simplify my response to something like:
In php I've been using:
To set the header.
Guess I'm stuck using the older version until I find a solution.
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Apr 6, 2010
I am trying to develop a iGoogle-like dashboard that uses JSONP to get the content of each widget from other (trusted) sites.Each widget is a div that will take care of getting its content using $.ajax() and use the callback to update the div with the html content returned with JSONP.The problem I have happens only in Firefox (I'm using 3.6.3):when a site is unavailable or takes longer to return the JSONP content for a widget, it seems that the callback for the other widget does not get executed. All the widgets stay in the "loading" state although I'm sure they have all received the answer.What's puzzling is that if I hit the "stop" button of Firefox, the content of the other widgets get displayed (ie. their displaying callbacks get executed).
If the calls are asynchronous, what prevents Firefox from executing the callbacks for the other widgets once the response is received?Do you have any idea of what's happening and if there's some way around this?
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May 13, 2011
There is probably something going on in my environment but when running 1.5.2, jquery runs and behaves fine. When I switched to 1.6.1 immediately the success callbacks of ajax functions did not trigger. I did not see the release notes mention anything new regarding that.
This includes
$.post("url", function() { console.log("will i get printed?"); });
Here is a code sample which fails
$(".foo").click(function(e) {
var link = $(this);
e.preventDefault();[code].....
The callback function for the ajax is never invoked.As part of my application, I have the following ajax setup going
$.ajaxSetup({
'beforeSend': function(xhr) {xhr.setRequestHeader("Accept", "text/javascript")}
});
Firefox 4.0.1, Ubuntu 10.04, Firebug 1.7
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May 5, 2010
My understanding had been that $.css("width") would return the original user selected style, eg "100%" or "10em", and $.width() returned the computed width, always in "px". Not so, following the code through for .css(), it calls something called getComputedStyle and the only difference between the two functions turns out to be a post-fix of "px" on the .css() result - not very useful. I need to know whether my user has called me with a proportional dimension, or a fixed one. How to tell with jQuery?
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Aug 1, 2007
I am trying to program a script that will output the solution for the towers of hanoi problem, the only problem is that it will not output the solution it just hangs while calculating. Code:
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May 31, 2009
What is a callback function and how do we make and use them?
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Jul 20, 2005
In some pages of my website I use a code like the following:
for (var n = 0; n < getTagsArray("SPAN").length; n++){
//SPAN is just an example. I also use other tags
tag = getTagsArray("SPAN")[n];
//make something with tag...
}
function getTagsArray(Tag){
if(document.all){ //Internet Explorer
return document.all.tags(Tag);
}
else if (document.layers){ //Netscape
eval("return document.tags." + Tag);
}}
I want to put all browser-specific code inside the getTagsArray
function. So far, I've programmed only for Internet Explorer (my
browser), but now I want to make my website visible to all browsers.
I'm not sure about the getTagsArray function. Is it right or is there
a better way to do the same thing? And how can I extend that function
to make it work in other browsers?
Finally, where can I find some information about cross-browser
programming? I have the javascript reference for Internet Explorer and
Netscape, but I know nothing about other browsers.
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Apr 10, 2009
Have someone experience with javascript programming on windows mobile. the event.keycode will not work.
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Jun 5, 2009
I have to develop a program for translating a word in english into pig latin, I have most of it done, it runs but I can't make it define if the first letter see if it's a consonant or not, if it's a consonant take the consonant out and put"ay" at the end and if it's not consonant just put the "ay" at the end of the word, and it has to give an error message if user puts in more than one word, it's done in 2 classes, been stuck on this for hours now have done a lot of research but seems like everyone is doing a more advanced program. Here's my program:
First class
public class piglataintran
{
private String translate;
[code]....
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Dec 20, 2010
What type of Editor do you use for your JavaScript programming?
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Oct 12, 2011
This is probably quite a simple problem but I can't figure out the answer. I'm working on a site that has news stories and events coming in. What I would like is to have the news stories to be styled with squares and events with discs for instance. I might be able to change the actual plug-in so the CSS affects this change, but I just wondered how I could change the list-style-type with jQuery.
[Code]...
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Feb 28, 2003
I just released javascript lib that really helps to develop robust and clear js-scenarios following the OOP directions. The library is compatible with wide range of browsers on different platforms, including Netscape 4.x, Netscape 6.x, Netscape 7.x, Opera 6, Opera 7, Mozilla 1.0, IE 4, IE 5, IE 6.
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Nov 4, 2001
Can someone tell me all the OOP's that can be made from javascript.
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Dec 7, 2011
When I click the compute button, it does not do anything. It does not go to function CALCULATE and do its stuff.
[Code]...
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Jul 20, 2005
I must admit that the more I use and learn JavaScript, the more
convinced I am that it is one of the most expressive languages I know.
Without ways to access file i/o or databases though, can JavaScript be
considered as a serious general purpose language?
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Jul 16, 2009
I need to do something unusual. Say a user is browsing my site, and before they navigate away, I need to perform some actions like logging them out, for which they would need some data from the server. On onunload, a SJAX request (AJAX with that parameter as false) is issued, code flow hangs, and when the result comes in, code flow resumes and does what it needs to. If AJAX were used, the script would unload and never get the callback. Ok. So that's what I want. The problem is that I'm dealing with something other than an XMLHttpRequest object, and I can't simply supply a false parameter to the request function. I'm looking for some way to wrap an asynchronous routine of this object into a synchronous one. If call var result = myobject.get(data_to_send), code flow here hangs WHILE myobject calls this funky XMLHttpRequest-like object in asynchronous mode, waits for the callback, the callback is called, and myobject returns the result. So code stops synchronously outside of myobject.get, but waits asynchronously inside.
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Oct 10, 2009
How do you position an alert or prompt to anywhere on the screen. How do you change the font for the alert or prompt (i.e Hebrew)
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Jun 10, 2009
I'm animating a sliding panel but my callback executes right away when you click the slider link.This is the code:
Code:
$(document).ready(function(){
var stat = 0;[code]...
anything wrong with my animate function? (the callbacks are when it add/removes a class)
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Feb 9, 2011
This could appear under Ajax, for example, you could have multiple objects that make a singular ajax call (say an RPC-like request) and you need to update the object that made the call during the callback with the result, but it doesn't have to be. The particular problem I'm thinking about happens to be ajax, particularly with multiple objects accessing the same ajax request (meaning I can't use a global or temporary variable).
One way that seems like it would work (just thinking about it in my head), is to create a hash, and to pass the key through the request, store the key in the response, and pick it up on the callback side. Then remove the item from the hash when done.
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Jul 20, 2005
This might be a bit tricky. I want to call a method of a class using the setTimeout code, ok, can do this like this:
var instance = this;
timerID = window.setTimeout( function() { instance.Method(); }, 1000);
Now I want to call a method a number of times from with the class and when they
have all finished I want a second method to be called, I don't want the methods
themselves to be altered, i.e. I want this to be generic.
Here was my idea:
var timerCounter = 0
function CallFunc(func, callbackFunc)
{
timerCounter--;
if(timerCounter == 0)
{
callbackFunc()
}
}
function DoAsyncRequest(func, callbackFunction)
{
timerCounter++;
return window.setTimeout( CallFunc(func, callbackFunction), 1);
}
You would call this using something like:
timerId = DoAsyncRequest(this.method(), this.method2());
How could I do this, tryed using eval to no avail. I just don't know the
language well enough yet.
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