jQuery Not Recognizing Classes Added to Page Dynamically

Question

I am working on a project, where I'd like to add many elements of the same class to a page, and make all of these classes accessible to a $('selector').click(); event handler. What is happening though, is none of the dynamically added elements of the same class are responding to clicks.

To give you a better picture of what I mean, I made up a sample jsFiddle, which is very similar to the actual problem in my project:

Link to jsFiddle: http://jsfiddle.net/8LATf/3/

• One element of the class "added_element" is on the page already when it loads. This element is clickable.

• A button is clicked, and it adds other elements of class "added_element" to the page dynamically using append. None of these elements are clickable.

How can I make all of the elements of class "added_element" clickable? I'm guessing it has to do with the selector I use in the event handler, but I haven't been able to figure it out.

Any help is much appreciated!!!

Answer 1

You need to delegate your handler. The easiest way is to delegate everything to the document using .on('click', ...) (this is how .live() is converted internally, as of jQuery 1.7):

$(document).on('click','.added_element',function() {
    var id = $(this).attr('id');
    alert(id);    
});

​http://jsfiddle.net/mblase75/8LATf/4/

However, in your case, you can delegate to the #container, since all the added elements appear within that. Delegating to the closest possible DOM element is preferable for efficiency reasons, when it's possible.

$('#container').on('click','.added_element',function() {
    var id = $(this).attr('id');
    alert(id);    
});

​ ​http://jsfiddle.net/mblase75/8LATf/5/

Answer 2

You need to use events delegation here, the correct way to bind event will be:

$('#container').on('click', '.added_element', function() {
    var id = $(this).attr('id');
    alert(id);
});

Here is a corrected fiddle.

Answer 3

When you attach the event handler to "added_element" the ones created dynamically via script isn't in the DOM. So there isn't a event handler tied to the newly created element.

To get around this, attach the event handler to the containing div instead, and make it look for "added_element".

jfiddle: http://jsfiddle.net/yKJny/