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jQuery Q&A » Development » synchronous 

1. How can I get jQuery to perform a synchronous, rather than asynchronous, AJAX request?    stackoverflow.com

I have a javascript widget witch provides standard extension points. One of them is the beforecreate function. It should return false to prevent an item from being created. I've added an ...

2. JavaScript synchronous custom prompt    stackoverflow.com

I need to use a custom prompt, just like the one shown in this jQuery plugin demo. The problem is, all custom prompts depend on a callback, they are asynchronized, i ...

3. jQuery synchronous operation    stackoverflow.com

I am fading elements one by one but it seems it all fades at once. How can I fade elements one by one. Only if one fades completely, should the second start ...

4. Synchronous cross sub-domain POST request with jQuery    stackoverflow.com

I'm trying to do a cross domain POST request and have hit a wall (or two). I can't put a proxy page on the server - so that is not an option. I ...

5. jquery synchronous functions    stackoverflow.com

Is there a way to run a function after another functions completes? For example:

doSomething();
doSomethingElse();
i only want doSomethingElse() to run after doSomething completes. is this possible?

6. When is JavaScript synchronous?    stackoverflow.com

I have been under the impression for that JavaScript was always asynchronous. However, I have learned that there are situations where it is not (ie DOM manipulations). Is there ...

7. How to write a loop in jQuery which waits for each function to complete before continuing the loop    stackoverflow.com

Please forgive me if this is an obvious one. I have an unknown amount of elements on a page, which I need to loop through one at a time and do stuff ...

8. Synchronous calls with jquery    stackoverflow.com

Can I make use of jQuery AJAX API and make a synchronous calls?

9. JavaScript: Global variables after Ajax requests    stackoverflow.com

the question is fairly simple and technical:

var it_works = false;

$.post("some_file.php", '', function(data) {

     it_works = true;

});

alert(it_works); # false (yes, that 'alert' has to be here and not ...

10. JQuery / Javascript synchronous calls    stackoverflow.com

I'm trying to get the value of the cookie after it's been modified and pass it to a script (via http GET). Here's my code:

<script>
function editCookieValue() {
  // function that sets/edits ...

11. How does jQuery's synchronous AJAX request work?    stackoverflow.com

Does jQuery.ajax({async: false}) still use the XMLHttpRequest object? If so, how is the request synchronous? Is there just some mechanism inside the function definition that allows the asynchronous request put out by the ...

12. Synchronous GET request with Javascript/jQuery    stackoverflow.com

I have a function that makes ajax GET request and based on the value returned sets one global JS variable. I use this variable (isCalculateTax in the code below) for further ...

13. When is it appropriate to use synchronous ajax?    stackoverflow.com

I was just reading another question about jQuery's synchronous ajax call, and I got to wondering:

What circumstances make a synchronous version of an ajax call beneficial/necessary?
Ideally I'd like an ...

14. Synchronous Ajax with jQuery    stackoverflow.com

I have a web app that makes a ton of $.post() requests. The server must receive these in the order that they were created. To guarantee this, I first thought I'd ...

15. How can I do a synchronous request with jQuery?    stackoverflow.com

Why don't return that function the responseText?

function LoadBookmarksAsXml()
{
  return $.ajax(
  {
    type: 'GET',
    async: false,
    url:  'http://www.google.com/bookmarks/?output=xml&num=10000'
  }).responseText;
}
(It ...

16. jquery ajax synchronous call beforeSend    stackoverflow.com

I have a function called:

function callAjax(url, data) {
 $.ajax(
   {
     url: url, // same domain
     data: data,
     ...

17. How can I make JQuery.ajax synchronous with a timeout?    stackoverflow.com

I have a calendar with data that is on the server. When the user moves forward by a month, I might (based on previous actions) need to fetch that data ...

18. JQuery AJAX request behaving synchronous for unknown reason    stackoverflow.com

I have the following code which I want to be running asynchronously, but the logs are showing that they are running synchronously.

$(".widget").each(function() {
    // snip - url, def, ...

19. Can this be done without synchronous AJAX?    stackoverflow.com

I'd like to change my following code from synchronous to async AJAX for performance reasons. Is this possible? I'm finding that almost all of my AJAX calls are synchronous, so I sense that ...

20. JQuery AJAX request behaving synchronous    stackoverflow.com

This is similar to the "answered" question
JQuery AJAX request behaving synchronous for unknown reason I believe that the actual issue with parallel execution observed by MGM has been overlooked and actually ...

21. Displaying AJAX responses in the same order in which they were sent out, *without* using queueing or synchronous requests?    stackoverflow.com

I'm sending out a bunch of getJSON() requests to a remote server (to fetch images), and I'd like to display the responses (images) in the same order in which I send ...

22. Running one thing after another in jquery    stackoverflow.com

I have this code snippet from something i am developing

<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.1/jquery.min.js"></script>
<script type="text/javascript">
    $(function(){
        $("#Submit").click(function(){
       ...

23. What are the drawbacks of using synchronous ajax call?    stackoverflow.com

This question could surely be applied to jQuery but in this case I am referring to Prototype. In the Prototype doc it says,

Since synchronous usage is rather unsettling, ...

24. jQuery problem with (a)synchronous method calls    stackoverflow.com

I have an strange behavior, which looks lika an problem with (a)synchronous method calls?!? I'm not sure! An function receives data using getJSON, post process those data, add them to an table, which ...

25. Javascript async and synchronous ajax ops    stackoverflow.com

If I have a synchronous ajax call running, and an asynchronous call is made while that is happening (via setTimeout() ) will the second call stop/interupt/have any impact on the ...

26. jQuery: Performing synchronous AJAX requests    stackoverflow.com

I've done some jQuery in the past, but I am completely stuck on this. I know about the pros and cons of using synchronous ajax calls, but here it will ...

27. Synchronous delay in code execution    stackoverflow.com

I have a code which needs to be executed after some delay say 5000 ms.Currently I am using setTimeout but it is asynchronous and i want the execution to wait for ...

28. jquery synchronous execute    stackoverflow.com

Very Sorry for my english,i have a problem.

$("#MainPicture").attr("src", url);
CenterImg();
needs to be execute line 2 code after line 1 code finished . it is asynchronous and i want the code excute ...

29. Asynchronous and Synchronous Terms    stackoverflow.com

I'm confused by the term asynchronous when related to programming. It seems to mean the opposite in programming terms as what it is defined as in the dictionary. For ...

30. Is jQuery "each()" function synchronous?    stackoverflow.com

consider this scenario for validating:

function validateForm (validCallback) {
   $('#first-name').add($('#last-name')).add($('#address')).each(function () {
      // validating fields and adding 'invalid' class to invalid fields.
   });
 ...

31. How to make synchronous JSONP ajax calls with Jquery    stackoverflow.com

I'm trying to retrieve account information for multiple accounts transforming the XML data to JSONP. The problem is that all the functions get kicked off at the same time and ...

32. Why don't synchronous ajax calls in jquery support timeout?    stackoverflow.com

I was reading here that synchronous ajax calls in jquery don't time out. Is this a technical limitation, or just something the authors didn't feel like supporting? What actually ...

33. jQuery: Making synchronous requests properly    stackoverflow.com

Ok, so I need to open a dialog (jQuery UI) before performing the actual AJAX request and depending on what the user chooses, continue with the AJAX request or simply do ...

34. Origin null is not allowed by Access-Control-Allow-Origin (Synchronous, no jQuery)    stackoverflow.com

The first thing I would like to say is that I looked around for an answer to this for quite some time, but everything I found was about jQuery. This is ...

35. synchronous vs asynchronous $.post    forum.jquery.com

36. asynchronous blocks of synchronous actions    forum.jquery.com

function t1(next) { var i1 = $('#item1'); var i2 = $('#item2'); var i3 = $('#item3'); $.when( i1.delay(1000).show(0).delay(300).hide(0), i2.show(0).html('OOOOOOOOOOOOOOOOOOOOOOOOOOOO').delay(7000).hide(0), i3.html('').delay(1300).show(0) ).done( next() );}function t2(next) { var i5 = $('#item5'); $.when( i5.show(0).animate({ 'left': '+=50%', 'top': '+=30%' }, 200).animate({ 'left': '-=50%', 'top': '-=30%' }, 200).animate({ 'left': '+=50%', 'top': '+=30%' }, 200).animate({ 'left': '-=50%', 'top': '-=30%' }, 200) ).done( next() );}function t3(next) { ...

37. Elegant way to avoid synchronous call?    forum.jquery.com

basically i created an array of promise objects, passed them into the jQuery.when method using .apply so that each array element would become an argument to the jQuery.when method, then i called .then() on the resulting promise object with a callback so that when all passed in promise objects are resolved, the callback will run.

38. Some synchronous trouble    forum.jquery.com

39. synchronous ajax (sjax) vs hard coded control    forum.jquery.com

hi there, i have to populate a combo with data retreived through an asynchronous ajax with $.post and after that disable some of the combo's options depending on one selected in another list.i don't know whether to use synchronous ajax (sjax) or to call in the success function of the $.post a function that remove the options. the thing is that ...

40. jQuery Synchronous .ajax Bug?    forum.jquery.com

My system is dynamically template-loading. Base scripts loaded after loading the homepage include some alert boxes and a date picker box, and it eventually loads some template with its scripts and styles and pastes them into the homepage. The scripts of the loaded template contain some functions to operate the date picker box. Thus, the date picker box has functions, some ...

42. [jQuery] Synchronous call in JQuery?    forum.jquery.com

I'm trying to load a JQuery dialog containing content from thebackend.JQuery places this dialog vertically in the middle of the page whenthe dialog open call is executed.But the moment that happens, another function is still loading dataand parsing that data in the dialog.So it is not completed yet.This way, the dialog is not centered in the middle of the page becausethe ...

43. [jQuery] jquery.ajax with async=false is not synchronous with remote files    forum.jquery.com

Hi Maxim,thanks for your idea, I've tested it.- with firefox 3.5 under ubuntu-- ajax: false and true, with one, or two script-tags and a localscript-src it always works as expected-- with a remote file and one script-block it always works like havingstated async: true with two script blocks it always behaves like async: falseOne now could think, fine lets use two ...

44. [jQuery] semi-synchronous ajax request?    forum.jquery.com

Hi,I'm trying to implement a client side cache for an ajax basedapplication but I'm not sure how to deal with the asynchronous natureof ajax calls in jquery. What I'm basically trying is to create afunction getList() that fetches a snippet of text from the server andstores it in a variable so that future invocations of getList() nolonger have to contact the ...

45. [jQuery] Screen locked in between multiple synchronous ajax calls?    forums.devshed.com

hi, I'm trying to make a little loop that in each itteration executes a little php script to send mail with the mail() function. the php script returns either succes or failure. Now its my intention to append that msg to a div, after every execution. $.ajax({ type: "POST", data: dataString2, url: "sendmail.php", async: false, success: function(result) { showStatus(result); y++; zendMails(y); ...

46. jQuery Synchronous Problems    sitepoint.com

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