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<div id="pagetitle"><h1>YUI Library Examples: Animation: Reversing an Animation</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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<div class="yui-u first example" id="main">
<h2>Animation: Reversing an Animation</h2>
<div id="example" class="promo">
<p>
<p>This demonstrates how to use the <code>reverse</code> attribute to change the behavior of the animation.</p>
<p> Click the icon in the header to toggle the element's <code>height</code>.</p>
</p>
<div class="module example-container ">
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<p class="newWindowButton yui-skin-sam">
<a href="reverse_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 =============================== -->
<div id="demo" class="yui-module">
<div class="yui-hd">
<h4>Animation Demo</h4>
</div>
<div class="yui-bd">
<p>This an example of what you can do with the YUI Animation Utility.</p>
<p><em>Follow the instructions above to see the animation in action.</em></p>
</div>
</div>
<p>This is placeholder text used to demonstrate how the above animation affects subsequent content.</p>
<script type="text/javascript">
YUI({base:"../../build/", timeout: 10000}).use("node", "anim", function(Y) {
var module = Y.get('#demo');
// add fx plugin to module body
var content = module.query('.yui-bd').plug(Y.Plugin.NodeFX, {
from: { height: 1 },
to: {
height: function(node) { // dynamic in case of change
return node.get('scrollHeight'); // get expanded height (offsetHeight may be zero)
}
},
easing: Y.Easing.easeOut,
duration: 0.5
});
var onClick = function(e) {
module.toggleClass('yui-closed');
content.fx.set('reverse', !content.fx.get('reverse')); // toggle reverse
content.fx.run();
};
// use dynamic control for dynamic behavior
var control = Y.Node.create(
'<a title="show/hide content" class="yui-toggle">' +
'<em>toggle</em>' +
'</a>'
);
// append dynamic control to header section
module.query('.yui-hd').appendChild(control);
control.on('click', onClick);
});
</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">
<div id="demo" class="yui-module">
<div class="yui-hd">
<h4>Animation Demo</h4>
<a title="remove module" class="yui-toggle"><em>-</em></a>
</div>
<div class="yui-bd">
<p>This an example of what you can do with the YUI Animation Utility.</p>
<p><em>Follow the instructions above to see the animation in action.</em></p>
</div>
</div>
</textarea>
<h3>Using the NodeFX Plugin</h3>
<p>For this example, we will use <code>Node</code>'s <code>fx</code> plugin to animate the element. The plugin adds the anim instance to the <code>Node</code> instance, pre-configuring it to use the Node instance as the <code>Anim</code>'s node. The <code>plug</code> method accepts a class to construct and an optional config to pass to the constructor.</p>
<p>Setting the <code>from</code> attribute to the expanded height of the element allows us to toggle the effect using the <code>reverse</code> attribute, which we will see below (<code>from</code> uses current value when omitted).</p>
<textarea name="code" class="JScript" cols="60" rows="1">
var module = Y.get('#demo');
// add fx plugin to module body
var content = module.query('.yui-bd').plug(Y.Plugin.NodeFX, {
from: { height: 0 },
to: {
height: function(node) { // dynamic in case of change
return node.get('scrollHeight'); // get expanded height (offsetHeight may be zero)
}
},
easing: Y.Easing.easeOut,
from: { height: 0 },
duration: 0.5
});
</textarea>
<h3>Creating the Control Element</h3>
<p>Because our behavior only works when JS is available, let's go ahead and add our control element using JS as well.</p>
<textarea name="code" class="JScript" cols="60" rows="1">
// use dynamic control for dynamic behavior
var control = Y.Node.create(
'<a title="show/hide content" class="yui-toggle">' +
'<em>toggle</em>' +
'</a>'
);
// append dynamic control to header section
module.query('.yui-hd').appendChild(control);
</textarea>
<h3>Toggling Animation Behavior</h3>
<p>Before calling <code>run</code> in our <code>click</code> handler, we will use the <code>reverse</code> attribute toggle the direction of the animation depending on whether its opening or closing.</p>
<textarea name="code" class="JScript" cols="60" rows="1">
var onClick = function(e) {
module.toggleClass('yui-closed');
content.fx.set('reverse', !content.fx.get('reverse')); // toggle reverse
};
</textarea>
<h3>Running the Animation</h3>
<p>Finally we add an event handler to run the animation.</p>
<textarea name="code" class="JScript" cols="60" rows="1">
module.query('.yui-toggle').on('click', onClick);
</textarea>
<h3>Full Script Source</h3>
<textarea name="code" class="JScript" cols="60" rows="1">
YUI().use('anim', function(Y) {
var module = Y.get('#demo');
// add fx plugin to module body
var content = module.query('.yui-bd').plug(Y.Plugin.NodeFX, {
from: { height: 0 },
to: {
height: function(node) { // dynamic in case of change
return node.get('scrollHeight'); // get expanded height (offsetHeight may be zero)
}
},
easing: Y.Easing.easeOut,
duration: 0.5
});
var onClick = function(e) {
module.toggleClass('yui-closed');
content.fx.set('reverse', !content.fx.get('reverse')); // toggle reverse
content.fx.run();
};
// use dynamic control for dynamic behavior
var control = Y.Node.create(
'<a title="show/hide content" class="yui-toggle">' +
'<em>toggle</em>' +
'</a>'
);
// append dynamic control to header section
module.query('.yui-hd').appendChild(control);
control.on('click', onClick);
});
</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><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 class='selected'><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>
</div>
<div class="mod box4">
<div class="hd">
<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>
</ul>
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