How do I attach events to dynamic HTML elements with jQuery? [duplicate]

Question

Suppose I have some jQuery code that attaches an event handler to all elements with class .myclass.

For example:

$(function(){
    $(".myclass").click( function() {
        // do something
    });
});

And my HTML might be as follows:

<a class="myclass" href="#">test1</a>
<a class="myclass" href="#">test2</a>
<a class="myclass" href="#">test3</a>

That works with no problem. However, consider if the .myclass elements were written to the page at some future time.

For example:

<a id="anchor1" href="#">create link dynamically</a>
<script type="text/javascript">
$(function(){
    $("#anchor1").click( function() {
        $("#anchor1").append('<a class="myclass" href="#">test4</a>');
    });
});
</script>

In this case, the test4 link is created when a user clicks on a#anchor1.

The test4 link does not have the click() handler associated with it, even though it has class="myclass".

Basically, I would like to write the click() handler once and have it apply to both content present at page load, and content brought in later via AJAX / DHTML. Any idea how I can fix this?

Koval

Here's a detailed article on how to bind click event for dynamic element goo.gl/zlEbnv – Barthol

A pure javascript only(vanilla js) solution: https://mcmap.net/q/45133/-event-binding-on-dynamically-created-elements – Steeple

Here is the answer youtube.com/watch?v=unk-U_LQWuA – Slipknot

Maybe this article will help: dontrepeatyourself.org/post/… – Liberalism

Answer 1

I am adding a new answer to reflect changes in later jQuery releases. The .live() method is deprecated as of jQuery 1.7.

From http://api.jquery.com/live/

As of jQuery 1.7, the .live() method is deprecated. Use .on() to attach event handlers. Users of older versions of jQuery should use .delegate() in preference to .live().

For jQuery 1.7+ you can attach an event handler to a parent element using .on(), and pass the a selector combined with 'myclass' as an argument.

See http://api.jquery.com/on/

So instead of...

$(".myclass").click( function() {
    // do something
});

You can write...

$('body').on('click', 'a.myclass', function() {
    // do something
});

This will work for all a tags with 'myclass' in the body, whether already present or dynamically added later.

The body tag is used here as the example had no closer static surrounding tag, but any parent tag that exists when the .on method call occurs will work. For instance a ul tag for a list which will have dynamic elements added would look like this:

$('ul').on('click', 'li', function() {
    alert( $(this).text() );
});

As long as the ul tag exists this will work (no li elements need exist yet).

Ul

This otherwise brilliant solution seems to have a problem with HTML content living in a Fancybox. I've reverted to creating the handlers for that manually. I didn't try iFrame Content yet, so the content of the fanyxbos is part of the body or in my case of the document variable. – Cosher

live() is deprecated and .on() came. But it is not clear that when I write $('selector').on('event', callback(){}) then it wont work. Need to write desired selector inside on(). $(document).on('event', 'selector', callback(){}) or, $('body').on('event', 'selector', callback(){}) – Forequarter

what about performance? is it the same as attaching events directly? – Exquisite

Not work when <a> element have href address that set to http://???? – Thelmathem

$('body').on('each', 'myclass', function() { // do something }); @Ul I tried to make something on "each" of a "class", but it doesn't work. What is wrong? – Saree

in my case, it instead assigns the event on the parent tag. I use jquery version 1.12.4. Any idea? – Transduction

Excellent solution, works well when adding DOM elements via javascript which were added during document.ready. – Adsorbent

@Ul and Chuck, Thanks for the answer and the editing respectively. :) – Myocarditis

$('.yourDynamicElement').attr('onClick', 'yourFunction()'); would also work properly – Fawnia

As @Juan said, I am also concerned about performance, is this going to perform more evaluations than directly attatching the event to the specific element? – Overtire

Answer 2

Sometimes doing this (the top-voted answer) is not always enough:

$('body').on('click', 'a.myclass', function() {
    // do something
});

This can be an issue because of the order event handlers are fired. If you find yourself doing this, but it is causing issues because of the order in which it is handled.. You can always wrap that into a function, that when called "refreshes" the listener.

For example:

function RefreshSomeEventListener() {
    // Remove handler from existing elements
    $("#wrapper .specific-selector").off(); 

    // Re-add event handler for all matching elements
    $("#wrapper .specific-selector").on("click", function() {
        // Handle event.
    }
}

Because it is a function, whenever I set up my listener this way, I typically call it on document ready:

$(document).ready(function() {
    // Other ready commands / code

    // Call our function to setup initial listening
    RefreshSomeEventListener();
});

Then, whenever you add some dynamically added element, call that method again:

function SomeMethodThatAddsElement() {
    // Some code / AJAX / whatever.. Adding element dynamically

    // Refresh our listener, so the new element is taken into account
    RefreshSomeEventListener();
}

Hopefully this helps!

Regards,

Deration

Thanks! Couldn't get it to work with other answers, your solution worked like a charm, however if I call RefreshSomeEventListener() after adding dynamic element, my event is triggered twice – Langelo

@Langelo Likely this is because you're not fully removing the event listeners from it. – Superfluous

This works, and good explanation, too. – Kwangchow

This is the answer I was looking for! – Cheetah

Answer 3

After jQuery 1.7 the preferred methods are .on() and .off()

Sean's answer shows an example.

Now Deprecated:

Use the jQuery functions .live() and .die(). Available in jQuery 1.3.x

From the docs:

To display each paragraph's text in an alert box whenever it is clicked:

$("p").live("click", function(){
  alert( $(this).text() );
});

Also, the livequery plugin does this and has support for more events.

Partee

What if my selector needs to be the parent of some other element? For example: $("p").parent(".myclass").live("click", ... This doesn't seem to work with live(). – Koval

You could try to incorporate that into a single query like $("p:has(.myclass)").live("click",...). Note: there are some cases where live doesn't work for all events. Check out livequery plugin for support not offered by live. – Partee

This is no longer the correct Answer. The .live() method is deprecated as of jQuery 1.7. Use .on() instead. Lets get the correct answer[https://mcmap.net/q/63978/-how-do-i-attach-events-to-dynamic-html-elements-with-jquery-duplicate] some upvotes. Or @Matt - do you want to update your answer? – Ardeth

Answer 4

If you're adding a pile of anchors to the DOM, look into event delegation instead.

Here's a simple example:

$('#somecontainer').click(function(e) {   
  var $target = $(e.target);   
  if ($target.hasClass("myclass")) {
    // do something
  }
});

Wirephoto

Answer 5

You can bind a single click event to a page for all elements, no matter if they are already on that page or if they will arrive at some future time, like that:

$(document).bind('click', function (e) {
   var target = $(e.target);
   if (target.is('.myclass')) {
      e.preventDefault(); // if you want to cancel the event flow
      // do something
   } else if (target.is('.myotherclass')) {
      e.preventDefault();
      // do something else
   }
});

Been using it for a while. Works like a charm.

In jQuery 1.7 and later, it is recommended to use .on() in place of bind or any other event delegation method, but .bind() still works.

Soda

Answer 6

Binds a handler to an event (like click) for all current - and future - matched element. Can also bind custom events.

link text

$(function(){
    $(".myclass").live("click", function() {
        // do something
    });
});

Satisfy

live is deprecated. – Dealate

Answer 7

If your on jQuery 1.3+ then use .live()

Binds a handler to an event (like click) for all current - and future - matched element. Can also bind custom events.

Ayacucho

Answer 8

You want to use the live() function. See the docs.

For example:

$("#anchor1").live("click", function() {
    $("#anchor1").append('<a class="myclass" href="#">test4</a>');
});

Fisk

live is deprecated. – Odoriferous