How to make each fuction work with dynamically added elements?

Question

I have this script and I would like to make it work with dinamically added elements from database:

$( ".select-song li" ).each(
function( intIndex ){
    $( this ).bind (
        "click",
        function(){
          if($(this).hasClass('checked')){
           $(this).removeClass('checked');
          }
          else{
            $(this).addClass('checked');
          }
        }
        );
}
);

Elements are added in like this:

$('.select-song').append('<li>sth here</li>');

I know that I should to use on function but I have no idea how to implement it here.

Delegate event, no need for each loop http://learn.jquery.com/events/event-delegation/ — A. Wolff, Oct 01 '15 at 16:01

A. Wolff · Accepted Answer · 2015-10-01T16:12:21.537

2

Delegating event using on():

$(".select-song").on("click", "li", function(){
    $(this).toggleClass('checked');
});

edited Oct 01 '15 at 16:12

answered Oct 01 '15 at 16:03

A. Wolff

74,033
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You don't need the second parameter to `$.toggleClass()`. It behaves like that by default. – Phylogenesis Oct 01 '15 at 16:07
@Phylogenesis indeed you are correct, thx! – A. Wolff Oct 01 '15 at 16:12

score 0 · Answer 2 · answered Oct 01 '15 at 16:04

0

Delegate the event from .select-song to li:

$(".select-song").on("click", "li", function () {
    if ($(this).hasClass('checked')) {
        $(this).removeClass('checked');
    } else {
        $(this).addClass('checked');
    }
});

This way every time you append a newly created li in .select-song, the event will be bound to it. Remember that it's always best to delegate from the nearest non-dynamic parent. If you delegate from body or document for example, the performance will not be the same as the event will have to propagate until the matched selector.

answered Oct 01 '15 at 16:04

taxicala

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`If you delegate from body or document for example, the performance will not be the same` Is that really matter for a click event? I mean even Chuck Norris cannot be fast enough to click fster than browser can handle it. ;) – A. Wolff Oct 01 '15 at 16:08
yes, it does matter in large applications where many events are interacting together. – taxicala Oct 01 '15 at 16:09
and it also matters if the element that should receive the event is way down in the DOM tree. – taxicala Oct 01 '15 at 16:10
This is more important for cleaning events when static container is removed e.g, imho – A. Wolff Oct 01 '15 at 16:11

How to make each fuction work with dynamically added elements?

2 Answers2