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jQuery plugin which runs handler function once specified element is inserted into the DOM
(function ($) {
* @function
* @property {object} jQuery plugin which runs handler function once specified element is inserted into the DOM
* @param {function} handler A function to execute at the time when the element is inserted
* @param {bool} shouldRunHandlerOnce Optional: if true, handler is unbound after its first invocation
* @example $(selector).waitUntilExists(function);
$.fn.waitUntilExists = function (handler, shouldRunHandlerOnce, isChild) {
var found = 'found';
var $this = $(this.selector);
var $elements = $this.not(function () { return $(this).data(found); }).each(handler).data(found, true);
if (!isChild)
(window.waitUntilExists_Intervals = window.waitUntilExists_Intervals || {})[this.selector] =
window.setInterval(function () { $this.waitUntilExists(handler, shouldRunHandlerOnce, true); }, 500)
else if (shouldRunHandlerOnce && $elements.length)
return $this;

Thank you, Thank you, Thank you. I'm a total JS/Jquery noob and this issue was driving me crazy. I've got a project where I'm dynamically creating a element and then trying to use .change() to do things when are selected. The builds just fine and the .change() code looked good but it wouldnt work. Injected your waitUntilExists function and it works like a charm. Now I can stop beating my head on the keyboard wondering what's not working.

uwanius commented Apr 25, 2013

Hi, thank you for this great plugin. But how it is possible to run the function not only once, but every time.
I used it in the flexslider plugin to find out when a slider is active and then add a special class to the navigation.

my code:

var secondSlide =$("#secondary-slider li:eq(1).flex-active-slide");
var next2 = $('#home .flex-direction-nav li:eq(1) a');

$(secondSlide).waitUntilExists(function() {

This works fine, but only at once.

I forked and improved on your code a bit, if you want to pull in some or all of my changes. Thanks!

Thanks a lot!

beames commented Oct 11, 2014

Thanks!!!! Immediately solved the problem

Thanks !!

kdamken commented Mar 10, 2015

Thank you so much, this solved a very large headache for me!

Brilliant and easy! Thank you for this.

code2be commented May 10, 2015

Thank You for this great piece of code !

I love you. Not a pretty fix in my case but it does the trick.

Thank you so much! That's perfect!

Exactly what I'm looking for.

Just had to stop by and say Thanks man, this is the only plugin that worked for me, nice clean, simple.. Good work

This is not working anymore in Jquery3, because the .selector function was removed.

Any suggestion for Rails 5?

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