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# YUI Library Examples: Animation Utility: Animating From a Given Value

# Animation Utility: Animating From a Given Value

This demonstrates how to start a YUI Animation from a given value. Click the button to begin the demo.

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Demo

## Starting an Animation From a Given Value

The YUI Animation Utility allows you to specify arbitrary starting values for your animations.

For this example, we will animate the width of the `<div>` element named `demo`.

Add a little style so that we can see the animation in action:

<style type="text/css"> #demo { background:#ccc; overflow:hidden; /* so we can animate to zero width */ width:200px; } </style>

Create the `demo` element and a button to run the animation:

<div id="demo">Demo</div> <button id="demo-run">run</button>

Now we create an instance of `YAHOO.util.Anim`, passing it the element we wish to animate, and the style attribute(s) to be animated. The `from` field is optional (will start from current value if omitted). In this case, we will start from 600:

<script type="text/javascript"> var attributes = { width: { from: 600, to: 0 } }; var anim = new YAHOO.util.Anim('demo', attributes); </script>

The final step is to call the `animate` method on our instance to start the animation. The button will be the trigger that begins the animation sequence:

<script type="text/javascript"> YAHOO.util.Event.on('demo-run', 'click', function() { anim.animate(); }); </script>

This is an example of customizing the starting animation value with YUI Animation Utility.

## 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.

### Animation Utility Examples:

### More Animation Utility Resources:

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

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