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<title>Example: Alternating Iterations</title>
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<h1>Example: Alternating Iterations</h1>
<div class="yui3-g">
<div class="yui3-u-3-4">
<div id="main">
<div class="content"><link href="../assets/anim/anim.css" rel="stylesheet" type="text/css">
<div class="intro">
<p>This demonstrates how to use the <code>iterations</code> attribute to run multiple iterations of the animation.</p>
<p>Mouse over the link to begin the animation.</p>
</div>
<div class="example">
<a href="#" id="demo">hover me</a>
<script type="text/javascript">
YUI().use('anim', function(Y) {
var node = Y.one('#demo');
var anim = new Y.Anim({
node: node,
from: {
backgroundColor:node.getStyle('backgroundColor'),
color: node.getStyle('color'),
borderColor: node.getStyle('borderTopColor')
},
to: {
color: '#fff',
backgroundColor:'#FF8800',
borderColor: '#BA6200'
},
duration: 0.5,
iterations: 'infinite',
direction: 'alternate'
});
var hover = function(e) {
var reverse = false,
iterations = 'infinite';
if (anim.get('running')) {
anim.stop();
}
if (e.type === 'mouseout') {
reverse = true;
iterations = 1;
}
anim.setAttrs({
'reverse': reverse,
'iterations': iterations
});
anim.run();
};
node.on('mouseover', hover);
node.on('mouseout', hover);
});
</script>
</div>
<h2>Setting up the HTML</h2>
<p>First we add some HTML to animate.</p>
<pre class="code prettyprint"><a href="#" id="demo">hover me</a></pre>
<h2>Creating the Anim Instance</h2>
<p>Now we create an instance of <code>Y.Anim</code>, passing it a configuration object that includes the <code>node</code> we wish to animate and the <code>to</code> attribute containing the final properties and their values.</p>
<p>Adding an <code>iterations</code> attribute of "infinite" means that the animation will run continuously.</p>
<p>The <code>direction</code> attribute of "alternate" means that the animation reverses every other iteration.</p>
<pre class="code prettyprint">var node = Y.one('#demo');
var anim = new Y.Anim({
node: node,
from: {
backgroundColor:node.getStyle('backgroundColor'),
color: node.getStyle('color'),
borderColor: node.getStyle('borderTopColor')
},
to: {
color: '#fff',
backgroundColor:'#FF8800',
borderColor: '#BA6200'
},
duration: 0.5,
iterations: 'infinite',
direction: 'alternate'
});</pre>
<h2>Changing Attributes</h2>
<p>We don't want the animation running when the link is not hovered over, so we will change the animation attributes depending on whether or not we are over the link.</p>
<p>We can use a single handler for both mouse the mouseOver and mouseOut events, and set the <code>reverse</code> attribute depending on which event fired.</p>
<pre class="code prettyprint">var hover = function(e) {
var reverse = false,
iterations = 'infinite';
if (anim.get('running')) {
anim.pause();
}
if (e.type === 'mouseout') {
reverse = true;
iterations = 1;
}
anim.setAttrs({
'reverse': reverse,
'iterations': iterations
});
anim.run();
};</pre>
<h2>Running the Animation</h2>
<p>Finally we add event handlers to run the animation.</p>
<pre class="code prettyprint">node.on('mouseover', hover);
node.on('mouseout', hover);</pre>
<h2>Complete Example Source</h2>
<pre class="code prettyprint"><a href="#" id="demo">hover me</a>
<script type="text/javascript">
YUI().use('anim', function(Y) {
var node = Y.one('#demo');
var anim = new Y.Anim({
node: node,
from: {
backgroundColor:node.getStyle('backgroundColor'),
color: node.getStyle('color'),
borderColor: node.getStyle('borderTopColor')
},
to: {
color: '#fff',
backgroundColor:'#FF8800',
borderColor: '#BA6200'
},
duration: 0.5,
iterations: 'infinite',
direction: 'alternate'
});
var hover = function(e) {
var reverse = false,
iterations = 'infinite';
if (anim.get('running')) {
anim.stop();
}
if (e.type === 'mouseout') {
reverse = true;
iterations = 1;
}
anim.setAttrs({
'reverse': reverse,
'iterations': iterations
});
anim.run();
};
node.on('mouseover', hover);
node.on('mouseout', hover);
});
</script></pre>
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<div class="hd">
<h2 class="no-toc">Examples</h2>
</div>
<div class="bd">
<ul class="examples">
<li data-description="Creating and using a simple animation.">
<a href="basic.html">Basic Animation</a>
</li>
<li data-description="The Animation Utility allows you to implement 'easing effects' — for example, when an animation gradually slows down as it nears completion, that's an easing effect known as 'ease-in'. This example shows you how to use easing effects with your animations.">
<a href="easing.html">Easing Effects</a>
</li>
<li data-description="Color animations can be effective indicators of state during the lifespan of a dynamic page. This example shows you how to animate color attributes of an element.">
<a href="colors.html">Animating Colors</a>
</li>
<li data-description="The direction attribute can be used to reverse the animation on alternate iterations.">
<a href="alt-iterations.html">Alternating Iterations</a>
</li>
<li data-description="This example shows you how to animate the xy coordinates of an element.">
<a href="anim-xy.html">Animating XY Position</a>
</li>
<li data-description="This example demonstrates animating an element along a curved path using bezier control points.">
<a href="curve.html">Animating Along a Curved Path</a>
</li>
<li data-description="The reverse attribute allows you to change the run direction of an animation.">
<a href="reverse.html">Reversing an Animation</a>
</li>
<li data-description="This example demonstrates how to use the end event.">
<a href="end-event.html">Using the End Event</a>
</li>
</ul>
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<div class="sidebox">
<div class="hd">
<h2 class="no-toc">Examples That Use This Component</h2>
</div>
<div class="bd">
<ul class="examples">
<li data-description="Working with multiple YUI instances.">
<a href="../yui/yui-multi.html">Multiple Instances</a>
</li>
<li data-description="Shows how to create a simple plugin to animate the Overlay's movement and visibility.">
<a href="../overlay/overlay-anim-plugin.html">Animation Plugin</a>
</li>
<li data-description="How to make an animated node a Drop target.">
<a href="../dd/anim-drop.html">Animated Drop Targets</a>
</li>
</ul>
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<script>
YUI.Env.Tests = {
examples: [],
project: '../assets',
assets: '../assets/anim',
name: 'alt-iterations',
title: 'Alternating Iterations',
newWindow: '',
auto: false
};
YUI.Env.Tests.examples.push('basic');
YUI.Env.Tests.examples.push('easing');
YUI.Env.Tests.examples.push('colors');
YUI.Env.Tests.examples.push('alt-iterations');
YUI.Env.Tests.examples.push('anim-xy');
YUI.Env.Tests.examples.push('curve');
YUI.Env.Tests.examples.push('reverse');
YUI.Env.Tests.examples.push('end-event');
YUI.Env.Tests.examples.push('yui-multi');
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