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<div id="pagetitle"><h1>YUI Library Examples: Animation: Alternating Iterations</h1></div>
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<div id="bar-note"><p><strong>Note:</strong> This is YUI 3.x. Looking for <a href="http://developer.yahoo.com/yui/">YUI 2.x</a>?</p></div>
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<h2>Animation: Alternating Iterations</h2>
<div id="example" class="promo">
<p>
<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>
</p>
<div class="module example-container ">
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<a href="alt-iterations_clean.html" target="_blank">View example in new window.</a>
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</div> <div id="example-canvas" class="bd">
<!--BEGIN SOURCE CODE FOR EXAMPLE =============================== -->
<a href="#" id="demo">hover me</a>
<script type="text/javascript">
YUI({base:"../../build/", timeout: 10000}).use("anim", function(Y) {
var node = Y.get('#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:'#ffa928',
borderColor: '#71241a'
},
duration: 0.5,
iterations: 'infinite',
direction: 'alternate'
});
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();
};
node.on('mouseover', hover);
node.on('mouseout', hover);
});
</script>
<!--END SOURCE CODE FOR EXAMPLE =============================== -->
</div>
</div>
</div>
<h3>Setting up the HTML</h3>
<p>First we add some HTML to animate.</p>
<textarea name="code" class="JScript" cols="60" rows="1">
<a href="#" id="demo">hover me</a>
</textarea>
<h3>Creating the Anim Instance</h3>
<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>
<textarea name="code" class="JScript" cols="60" rows="1">
var node = Y.get('#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:'#ffa928',
borderColor: '#71241a'
},
duration: 0.5,
iterations: 'infinite',
direction: 'alternate'
});
</textarea>
<h3>Changing Attributes</h3>
<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>
<textarea name="code" class="JScript" cols="60" rows="1">
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();
};
</textarea>
<h3>Running the Animation</h3>
<p>Finally we add event handlers to run the animation.</p>
<textarea name="code" class="JScript" cols="60" rows="1">
node.on('mouseover', hover);
node.on('mouseout', hover);
</textarea>
<h3>Full Script Source</h3>
<textarea name="code" class="JScript" cols="60" rows="1">
YUI().use('anim-color', function(Y) {
var node = Y.get('#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:'#ffa928',
borderColor: '#71241a'
},
duration: 0.5,
iterations: 'infinite',
direction: 'alternate'
});
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();
};
node.on('mouseover', hover);
node.on('mouseout', hover);
});
</textarea>
</div>
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<div id="examples" class="mod box4">
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<h4>
Animation Examples:</h4>
</div>
<div class="bd">
<ul>
<li><a href='../anim/basic.html'>Basic Animation</a></li><li><a href='../anim/easing.html'>Animation Easing</a></li><li><a href='../anim/colors.html'>Animating Colors</a></li><li class='selected'><a href='../anim/alt-iterations.html'>Alternating Iterations</a></li><li><a href='../anim/anim-xy.html'>Animating XY Position</a></li><li><a href='../anim/curve.html'>Animating Along a Curved Path</a></li><li><a href='../anim/scroll.html'>Animated Scrolling</a></li><li><a href='../anim/reverse.html'>Reversing an Animation</a></li><li><a href='../anim/end-event.html'>Using the End Event</a></li><li><a href='../anim/anim-chaining.html'>Chaining Animations Using the <code>end</code> Event</a></li><li><a href='../overlay/overlay-anim-plugin.html'>Animation Plugin (included with examples for Overlay)</a></li> </ul>
</div>
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<div class="mod box4">
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<h4>More Animation Resources:</h4>
</div>
<div class="bd">
<ul>
<!-- <li><a href="http://developer.yahoo.com/yui/anim/">User's Guide</a> (external)</li> -->
<li><a href="../../api/module_anim.html">API Documentation</a></li>
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