I have a bit of code where I am looping through all the select boxes on a page and binding a .hover event to them to do a bit of twiddling with their width on mouse on/off.

This happens on page ready and works just fine.

The problem I have is that any select boxes I add via Ajax or DOM after the initial loop won't have the event bound.

I have found this plugin (jQuery Live Query Plugin), but before I add another 5k to my pages with a plugin, I want to see if anyone knows a way to do this, either with jQuery directly or by another option.

7 upvote
  flag
Here's a detailed article on how to bind click event for dynamic element goo.gl/zlEbnv – Satinder singh

19 Answers 11

You can add events to objects when you create them. If you are adding the same events to multiple objects at different times, creating a named function might be the way to go.

var mouseOverHandler = function() {
    // Do stuff
};
var mouseOutHandler = function () {
    // Do stuff
};

$(function() {
    // On the document load, apply to existing elements
    $('select').hover(mouseOverHandler, mouseOutHandler);
});

// This next part would be in the callback from your Ajax call
$("<select></select>")
    .append( /* Your <option>s */ )
    .hover(mouseOverHandler, mouseOutHandler)
    .appendTo( /* Wherever you need the select box */ )
;

You could simply wrap your event binding call up into a function and then invoke it twice: once on document ready and once after your event that adds the new DOM elements. If you do that you'll want to avoid binding the same event twice on the existing elements so you'll need either unbind the existing events or (better) only bind to the DOM elements that are newly created. The code would look something like this:

function addCallbacks(eles){
    eles.hover(function(){alert("gotcha!")});
}

$(document).ready(function(){
    addCallbacks($(".myEles"))
});

// ... add elements ...
addCallbacks($(".myNewElements"))
1 upvote
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This post really helped me get a grasp on a problem I was having loading the same form and getting 1,2,4,8,16... submissions. Instead of using .live() I just used .bind() in my .load() callback. Problem solved. Thanks! – Thomas McCabe
up vote 1499 down vote accepted

As of jQuery 1.7 you should use jQuery.fn.on:

$(staticAncestors).on(eventName, dynamicChild, function() {});

Prior to this, the recommended approach was to use live():

$(selector).live( eventName, function(){} );

However, live() was deprecated in 1.7 in favour of on(), and completely removed in 1.9. The live() signature:

$(selector).live( eventName, function(){} );

... can be replaced with the following on() signature:

$(document).on( eventName, selector, function(){} );

For example, if your page was dynamically creating elements with the class name dosomething you would bind the event to a parent which already exists, often document.

$(document).on('mouseover mouseout', '.dosomething', function(){
    // what you want to happen when mouseover and mouseout 
    // occurs on elements that match '.dosomething'
});

Any parent that exists at the time the event is bound is fine. For example

$('.buttons').on('click', 'button', function(){
    // do something here
});

would apply to

<div class="buttons">
    <!-- <button>s that are generated dynamically and added here -->
</div>
3 upvote
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Note that the live method only works for certain events, and not others such as loadedmetadata. (See the caveats section in the documentation.) – Sam Dutton
22 upvote
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Learn more about event delegation here: learn.jquery.com/events/event-delegation. – Felix Kling
3 upvote
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Any way to accomplish this with pure javascript/vanilla js? – Ram Patra
10 upvote
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@Ramswaroop anything you can do in jQuery can be accomplished without jQuery. Here's a good example of event delegation without jQuery – dave
3 upvote
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@dave I wonder why the answer you pointed out isn't listed here. Eli has clearly asked for a solution without any plugin if possible. – Ram Patra
1 upvote
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Prior to jq1.7 and for jq1.4.2>, the recommended method was to use delegate(): api.jquery.com/delegate (which btw isn't removed from jq) As of jQuery 1.7, .delegate() has been superseded by the .on() method. For earlier versions, however, it remains the most effective means to use event delegation – A. Wolff
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How do you get a value from dynamic element without binding a click event. – Tech Savant
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  flag
and what if dynamicChild structure is complicated and maybe change in future? I want bind all objects with someClass to handler (there are in different DOM positions, static only modal div) and declare this binding only one time for all future objects in different positions in DOM ... now I am using workaround by attaching onclick="..." – madzohan
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how do you off events registered this way? simply calling each again and calling off() doesn't work. – Ben Dol
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what happens when you cant get the selector(id/class) you just have the element at hand? – minhajul
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struggling to have something done on when the element has just been ready for manipulations. like `$(document).on('load', '.dyn-el', function() { /* ... */});' – pilat

Try to use .live() instead of .bind(); the .live() will bind .hover to your checkbox after the Ajax request executes.

26 upvote
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The method live() was deprecated in version 1.7 in favor of on and deleted in version 1.9. – chridam

You can use the live() method to bind elements (even newly created ones) to events and handlers, like the onclick event.

Here is a sample code I have written, where you can see how the live() method binds chosen elements, even newly created ones, to events:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <title>Untitled Document</title>
    </head>

    <body>
        <script src="http://code.jquery.com/jquery-latest.js"></script>
        <script src="http://ajax.aspnetcdn.com/ajax/jquery.ui/1.8.16/jquery-ui.min.js"></script>

        <input type="button" id="theButton" value="Click" />
        <script type="text/javascript">
            $(document).ready(function()
                {
                    $('.FOO').live("click", function (){alert("It Works!")});
                    var $dialog = $('<div></div>').html('<div id="container"><input type ="button" id="CUSTOM" value="click"/>This dialog will show every time!</div>').dialog({
                                                                                                         autoOpen: false,
                                                                                                         tite: 'Basic Dialog'
                                                                                                     });
                    $('#theButton').click(function()
                    {
                        $dialog.dialog('open');
                        return('false');
                    });
                    $('#CUSTOM').click(function(){
                        //$('#container').append('<input type="button" value="clickmee" class="FOO" /></br>');
                        var button = document.createElement("input");
                        button.setAttribute('class','FOO');
                        button.setAttribute('type','button');
                        button.setAttribute('value','CLICKMEE');
                        $('#container').append(button);
                    });
                    /* $('#FOO').click(function(){
                                                     alert("It Works!");
                                                 }); */
            });
        </script>
    </body>
</html>
1 upvote
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live is deprecated – gorgi93

There is a good explanation in the documentation of jQuery.fn.on.

In short:

Event handlers are bound only to the currently selected elements; they must exist on the page at the time your code makes the call to .on().

Thus in the following example #dataTable tbody tr must exist before the code is generated.

$("#dataTable tbody tr").on("click", function(event){
    console.log($(this).text());
});

If new HTML is being injected into the page, it is preferable to use delegated events to attach an event handler, as described next.

Delegated events have the advantage that they can process events from descendant elements that are added to the document at a later time. For example, if the table exists, but the rows are added dynamically using code, the following will handle it:

$("#dataTable tbody").on("click", "tr", function(event){
    console.log($(this).text());
});

In addition to their ability to handle events on descendant elements which are not yet created, another advantage of delegated events is their potential for much lower overhead when many elements must be monitored. On a data table with 1,000 rows in its tbody, the first code example attaches a handler to 1,000 elements.

A delegated-events approach (the second code example) attaches an event handler to only one element, the tbody, and the event only needs to bubble up one level (from the clicked tr to tbody).

Note: Delegated events do not work for SVG.

6 upvote
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this'd be a better accepted answer because it'd be faster to delegate from the specific table rather than all the way from the document (the search area would be much smaller) – msanjay
2 upvote
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@msanjay: Although targetting the search closer to the elements is preferred, the search/speed difference is very minor in practice. You would have to click 50,000 times a second to notice anything :) – Gone Coding
1 upvote
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Can this approach be applied to handling checkbox clicks in a row by changing tr to an appropriate selector, like 'input[type=checkbox]', and this would be automatically handled for newly inserted rows? – JoeBrockhaus

This is a pure JavaScript solution without any libraries or plugins:

document.addEventListener('click', function (e) {
    if (hasClass(e.target, 'bu')) {
        // .bu clicked
        // Do your thing
    } else if (hasClass(e.target, 'test')) {
        // .test clicked
        // Do your other thing
    }
}, false);

where hasClass is

function hasClass(elem, className) {
    return elem.className.split(' ').indexOf(className) > -1;
}

Live demo

Credit goes to Dave and Sime Vidas

1 upvote
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2 upvote
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You may use Element.classList instead of splitting – Eugen Konkov
1 upvote
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@EugenKonkov Element.classList is not supported supported on older browsers. For example, IE < 9. – Ram Patra
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A nice article on how to get things done using vanilla script instead of jQuery - toddmotto.com/… – Ram Patra
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how about bubbling? What if the click event happened on a child of the element you are interested in? – Andreas Trantidis
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@AndreasTrantidis you have to check for the class of the child element: jsfiddle.net/ramswaroop/d8e1860r – Ram Patra

Another solution is to add the listener when creating the element. Instead of put the listener in the body, you put the listener in the element in the moment that you create it:

var myElement = $('<button/>', {
    text: 'Go to Google!'
});

myElement.bind( 'click', goToGoogle);
myElement.append('body');


function goToGoogle(event){
    window.location.replace("http://www.google.com");
}
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Your code contains 1 mistake: myElement.append('body'); must be myElement.appendTo('body');. On the other hand, if there is no need for the further use of variable myElement it's easier and shorter this way: $('body').append($('<button/>', { text: 'Go to Google!' }).bind( 'click', goToGoogle)); – ddlab

I prefer using on selector and I apply it on document.

This binds itself on the document and will be applicable to the elements that will be rendered after page load.

For example:

$(document).on("click",$(selector), function() {
    // Your code here
});

Any parent that exists at the time the event is bound and if your page was dynamically creating elements with the class name button you would bind the event to a parent which already exists

$(document).ready(function(){
  //Particular Parent chield click
  $(".buttons").on("click","button",function(){
    alert("Clicked");
  });  
  
  //Dynamic event bind on button class  
  $(document).on("click",".button",function(){
    alert("Dymamic Clicked");
  });
  $("input").addClass("button");  
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div class="buttons">
  <input type="button" value="1">
  <button>2</button>
  <input type="text">
  <button>3</button>  
  <input type="button" value="5">  
  </div>
<button>6</button>

Event binding on dynamically created elements

Single element:

$(document.body).on('click','.element', function(e) {  });

Child Element:

 $(document.body).on('click','.element *', function(e) {  });

Notice the added *. An event will be triggered for all children of that element.

I have noticed that:

$(document.body).on('click','.#element_id > element', function(e) {  });

It is not working any more, but it was working before. I have been using jQuery from Google CDN, but I don't know if they changed it.

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Yeap and they are not saying (document.body) its says ancestor wich could be pretty much anything – MadeInDreams

Take note of "MAIN" class the element is placed, for example,

<div class="container">
     <ul class="select">
         <li> First</li>
         <li>Second</li>
    </ul>
</div>

In the above scenario, the MAIN object the jQuery will watch is "container".

Then you will basically have elements names under container such as ul, li, and select:

$(document).ready(function(e) {
    $('.container').on( 'click',".select", function(e) {
        alert("CLICKED");
    });
 });

Try like this -

$(document).on( 'click', '.click-activity', function () { ... });

you could use

$('.buttons').on('click', 'button', function(){
    // your magic goes here
});

or

$('.buttons').delegate('button', 'click', function() {
    // your magic goes here
});

these two methods are equivalent but have a different order of parameters.

see: jQuery Delegate Event

Use the .on() method of jQuery http://api.jquery.com/on/ to attach event handlers to live element.

Also as of version 1.9 .live() method is removed.

You can attach event to element when dynamically created using jQuery(html, attributes).

As of jQuery 1.8, any jQuery instance method (a method of jQuery.fn) can be used as a property of the object passed to the second parameter:

function handleDynamicElementEvent(event) {
  console.log(event.type, this.value)
}
// create and attach event to dynamic element
jQuery("<select>", {
    html: $.map(Array(3), function(_, index) {
      return new Option(index, index)
    }),
    on: {
      change: handleDynamicElementEvent
    }
  })
  .appendTo("body");
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js">
</script>

Most flexible solution to create elements and bind events

// creating a dynamic element (container div)
var $div = $("<div>", {id: 'myid1', class: 'myclass'});

//creating a dynamic button
 var $btn = $("<button>", { type: 'button', text: 'Click me', class: 'btn' });

// binding the event
 $btn.click(function () { //for mouseover--> $btn.on('mouseover', function () {
    console.log('clicked');
 });

// append dynamic button to the dynamic container
$div.append($btn);

// add the dynamically created element(s) to a static element
$("#box").append($div);

The preferred way of creating a new element with jQuery

Here is why dynamically created elements do not respond to clicks :

var body = $("body");
var btns = $("button");
var btnB = $("<button>B</button>");
// `<button>B</button>` is not yet in the document.
// Thus, `$("button")` gives `[<button>A</button>]`.
// Only `<button>A</button>` gets a click listener.
btns.on("click", function () {
  console.log(this);
});
// Too late for `<button>B</button>`...
body.append(btnB);
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<button>A</button>

As a workaround, you have to listen to all clicks and check the source element :

var body = $("body");
var btnB = $("<button>B</button>");
var btnC = $("<button>C</button>");
// Listen to all clicks and
// check if the source element
// is a `<button></button>`.
body.on("click", function (ev) {
  if ($(ev.target).is("button")) {
    console.log(ev.target);
  }
});
// Now you can add any number
// of `<button></button>`.
body.append(btnB);
body.append(btnC);
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<button>A</button>

This is called "Event Delegation". Good news, it's a builtin feature in jQuery :-)

var i = 11;
var body = $("body");
body.on("click", "button", function () {
  var letter = (i++).toString(36).toUpperCase();
  body.append($("<button>" + letter + "</button>"));
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<button>A</button>

<html>
    <head>
        <title>HTML Document</title>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
    </head>

    <body>
        <div id="hover-id">
            Hello World
        </div>

        <script>
            jQuery(document).ready(function($){
                $(document).on('mouseover', '#hover-id', function(){
                    $(this).css('color','yellowgreen');
                });

                $(document).on('mouseout', '#hover-id', function(){
                    $(this).css('color','black');
                });
            });
        </script>
    </body>
</html>
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While this code snippet may solve the problem, it doesn't explain why or how it answers the question. Please include an explanation for your code, as that really helps to improve the quality of your post. Remember that you are answering the question for readers in the future, and those people might not know the reasons for your code suggestion. – Palec

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