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Having html list as , 

<ul id="slider">
    <li class=""></li>
    <li class=""></li>
    <li class=""></li>
    <li class="selected"></li>
    <li class=""></li>
    <li class=""></li>
    <li class=""></li>
<ul>

I am adding selected class to any of the li element. Here i have added class="selected" to fourth li element.

Want to execute some code when class selected is added to any of the li element.

tried this one , but not working as expected.

<script>
    $(function() {
        $('#slider').bind('DOMSubtreeModified', function(e) {
            alert("Changed");
        });
    });
</script>

Having html list as , 

<ul id="slider">
    <li class=""></li>
    <li class=""></li>
    <li class=""></li>
    <li class="selected"></li>
    <li class=""></li>
    <li class=""></li>
    <li class=""></li>
<ul>

I am adding selected class to any of the li element. Here i have added class="selected" to fourth li element.

Want to execute some code when class selected is added to any of the li element.

tried this one , but not working as expected.

<script>
    $(function() {
        $('#slider').bind('DOMSubtreeModified', function(e) {
            alert("Changed");
        });
    });
</script>
  • javascript
  • jquery
  • html
  • html-lists
Share Improve this question edited Jan 22, 2014 at 7:47 dcodesmith 9,6144 gold badges38 silver badges40 bronze badges asked Jan 13, 2014 at 10:53 Nishant NawarkhedeNishant Nawarkhede 8,40013 gold badges61 silver badges83 bronze badges 2
  • 9 When you add class, call specific function... Using any other way would be just bad practice – A. Wolff Commented Jan 13, 2014 at 10:54
  • 1 possible duplicate of jQuery - Fire event if CSS class changed – Ram Commented Jan 13, 2014 at 11:00
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3 Answers 3

Reset to default 3

Just invoke a function after you add the Class on the click event.

$(function() {

    function doSomething() {
      .....
    }

    $('ul').on('click', 'li' function(e) {
          $(this).addClass('selected');
          doSomething();
    });
});

The best way to handle this is just to call your function when you add the class, since it's your code adding it.

There are two mon ways to do that:

  1. You might do that with a direct call:

    li.addClass("selected");
doSomethingBecauseItChanged(li);

  2. Or you can do it by raising your own event on the li element that other code can listen to, which more thoroughly decouples the code adding the class from the code responding to the change.

    Here's the code listening for the event:

    $("#slider").on("added-class", function() {
    alert("Changed");
});

    And here's the code adding the class and raising the event:

    li.addClass("selected").trigger("added-class");

    Note that added-class is a name I made up, not something that already exists. Use whatever name you like, just make sure not to conflict with existing event types.

    Here's a plete example: Live Copy | Live Source

    <!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis./ajax/libs/jquery/1.10.1/jquery.min.js"></script>
<meta charset=utf-8 />
<title>Event Example</title>
  <style>
    li.selected {
      color: green;
    }
  </style>
</head>
<body>
<p>In two seconds, the third item will turn green and you'll see an alert.</p>
<ul id="slider">
    <li class="">xxxxx</li>
    <li class="">xxxxx</li>
    <li class="">xxxxx</li>
    <li class="">xxxxx</li>
    <li class="">xxxxx</li>
    <li class="">xxxxx</li>
    <li class="">xxxxx</li>
  </ul>
  <script>
    $("#slider").on("added-class", function() {
      alert("Changed");
    });
    setTimeout(function() {
      $("#slider li").eq(2).addClass("selected").trigger("added-class");
    }, 2000);
  </script>
</body>
</html>

Alternately, if you don't need IE support, you can use a mutation observer (support matrix), but frankly you really shouldn't need to use those if you control the code that's adding the class.

Register handler when you are adding the class.Something like this

$('li').addClass('selected').trigger('class-change');
$('#slider').bind('class-change', function() {
  //do something
 });
});

本文标签： javascriptDetect event when class is added to liStack Overflow

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