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Is there a jQuery equivalent to prototype's defer?

I'm looking for something that will delay the execution of a script until all of the scripts in the page are finished executing.

Thanks!

---

PART II: Is there any way to see if there are other setTimeouts in the queue and delay execution until after they fire? I see in the ments that sometimes setTimeout of 0 or 1 doesn't matter because it's unpredictable as to which will fire first.

Thanks again!

Update to answer

I found a bug in the code that I was using from the answer accepted below. The slice call needs to work on 0, not 1 since in the Prototype core code, it's accepting an extra parameter for the amount of time to wait (0.01). The final method then bees:

Function.prototype.deferFunc = function() {
   var __method = this, args = Array.prototype.slice.call(arguments, 0);
   return window.setTimeout(function() {
      return __method.apply(__method, args);
   }, 0.01);
}

Is there a jQuery equivalent to prototype's defer?

I'm looking for something that will delay the execution of a script until all of the scripts in the page are finished executing.

Thanks!

---

PART II: Is there any way to see if there are other setTimeouts in the queue and delay execution until after they fire? I see in the ments that sometimes setTimeout of 0 or 1 doesn't matter because it's unpredictable as to which will fire first.

Thanks again!

Update to answer

I found a bug in the code that I was using from the answer accepted below. The slice call needs to work on 0, not 1 since in the Prototype core code, it's accepting an extra parameter for the amount of time to wait (0.01). The final method then bees:

Function.prototype.deferFunc = function() {
   var __method = this, args = Array.prototype.slice.call(arguments, 0);
   return window.setTimeout(function() {
      return __method.apply(__method, args);
   }, 0.01);
}

• javascript
• jquery
• prototypejs

Share Improve this question Follow edited Jun 20, 2020 at 9:12 CommunityBot 111 silver badge asked Sep 1, 2010 at 9:49 shmuel613shmuel613 1,73411 gold badge1515 silver badges1717 bronze badges 3

• I'm not sure which defer you are referring to? The only one I know is not specific to Prototype. – Pekka Commented Sep 1, 2010 at 9:56
• 1 Ah, I assume you mean this one. prototypejs/api/function/defer – Pekka Commented Sep 1, 2010 at 9:59
• Yes, I'm referring to the js library prototype. – shmuel613 Commented Sep 5, 2010 at 12:31

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3 Answers 3

Sorted by: Reset to default 9

You can use the basic version available in vanilla JavaScript for most purposes, setTimeout():

setTimeout(function() {
  //do something
}, 0);

A similar queuing mechanism jQuery uses for animations are the callbacks and the .delay() function (which uses setTimeout() underneath).

All defer does is execute the function inside window.setTimeout with timeout of 0.

You can implement it like this I am sure:

Function.prototype.defer = function() {
        var __method = this, args = Array.prototype.slice.call(arguments, 1);
        return window.setTimeout(function() {
          return __method.apply(__method, args);
        }, 0);
      }

Demo

you can easily implement it:

Function.prototype.defer=function() {
    setTimeout(this, 0);
}

and here's a test:

var testFunc=function() {
    alert('first');
}
testFunc.defer();
alert('second');//first the browser will run this line, then will execute the above defered one.

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