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# YUI Library Examples: Dom Collection: Using removeClass

# Dom Collection: Using removeClass

Clicking the button will use Dom's `removeClass` method to remove the class `baz` from the element.

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## Using removeClass

`removeClass`, part of the YUI Dom Collection, makes it easy to remove a given className from an element.

To illustrate the use of `removeClass`, we'll create a `<div>` called `foo` with the classNames of `bar` and `baz`. When the button is clicked, we will remove the className `baz` from the element.

Add some markup for the demo element and a button to trigger the demo:

<div id="foo" class="bar baz">foo</div> <button id="demo-run">run</button>

Now we will define the function that removes the class `baz` from the `foo` element. The first argument of the `removeClass` method is either the ID of an HTMLElement, or an actual HTMLElement object. The second is the `className` to be removed. <script type="text/javascript"> var removeClass = function() { YAHOO.util.Dom.removeClass('foo', 'baz'); alert(YAHOO.util.Dom.get('foo').className); }; </script>

To trigger the demo, we will use the YUI Event Utility's `on` method to listen for clicks on the button.

<script type="text/javascript"> YAHOO.util.Event.on('demo-run', 'click', testClass); </script>

This is a simple example of how to use the `YAHOO.util.Dom.removeClass` method. One of the benefits of this method is that it works regardless of how many `className`s are present in the class attribute.

## Configuration for This Example

You can load the necessary JavaScript and CSS for this example from Yahoo's servers. Click here to load the YUI Dependency Configurator with all of this example's dependencies preconfigured.

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### Dom Collection Examples:

- Using setXY
- Using getXY
- Using setStyle
- Using getStyle
- Using hasClass
- Using addClass
- Using removeClass
- Using getElementsByClassName
- Exploring the Dom Collection's API

### More Dom Collection Resources:

- User's Guide (external)
- API Documentation
- Cheat Sheet PDF (external)

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