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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> |
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<html> |
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<head> |
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<meta http-equiv="content-type" content="text/html; charset=utf-8"> |
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<title>Basic Attribute Configuration</title> |
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<style type="text/css"> |
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/*margin and padding on body element |
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can introduce errors in determining |
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element position and are not recommended; |
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we turn them off as a foundation for YUI |
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CSS treatments. */ |
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body { |
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margin:0; |
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padding:0; |
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} |
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</style> |
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<link type="text/css" rel="stylesheet" href="../../build/cssfonts/fonts-min.css" /> |
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<script type="text/javascript" src="../../build/yui/yui-min.js"></script> |
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<!--begin custom header content for this example--> |
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<style type="text/css"> |
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.example-out .myclass-attrs { |
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font-family:courier; |
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margin-top:2px; |
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} |
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.example-out .myclass-title { |
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font-weight:bold; |
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font-family:arial; |
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color:#8dd5e7; |
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margin-top:5px; |
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margin-bottom:3px; |
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} |
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.example-out { |
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overflow:auto; |
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border:1px solid #000; |
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color:#ffffff; |
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background-color:#004C6D; |
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margin:5px; |
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height:8em; |
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padding:2px 2px 2px 5px; |
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} |
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</style> |
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<!--end custom header content for this example--> |
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</head> |
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<body class=" yui-skin-sam"> |
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<h1>Basic Attribute Configuration</h1> |
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<div class="exampleIntro"> |
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<p>This example provides an introduction to the Attribute utility, showing how you can use it to add attribute support to your own custom classes.</p> |
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<p> |
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It is geared towards users who want to create their own classes from scratch and add Attribute support. In most cases you should consider extending the <a href="http://developer.yahoo.com/yui/3/base/index.html"><code>Base</code></a> class when you need managed attribute support, |
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instead of augmenting Attribute directly, especially if you expect your class to be extended. <a href="http://developer.yahoo.com/yui/3/base/index.html"><code>Base</code></a> does the work described in this example for you, in addition to making it easier for users to extend you class. |
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</p> |
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</div> |
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<!--BEGIN SOURCE CODE FOR EXAMPLE =============================== --> |
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<div id="createo1"> |
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<button type="button" class="do">Create First Instance</button> Construct o1, with default attribute values |
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<div class="example-out"></div> |
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</div> |
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<div id="updateo1"> |
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<button type="button" class="do">Update First Instance</button> Update the first instance, using set |
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<div class="example-out"></div> |
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</div> |
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<div id="createo2"> |
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<button type="button" class="do">Create Second Instance</button> Create the second instance, passing initial values to the constructor |
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<div class="example-out"></div> |
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</div> |
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<script type="text/javascript"> |
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// Get a new instance of YUI and |
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// load it with the required set of modules |
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YUI({base:"../../build/", timeout: 10000}).use("node", "attribute", function(Y) { |
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// Setup custom class which we want to |
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// add managed attribute support to |
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function MyClass(cfg) { |
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// When constructed, setup the initial attributes for the instance, by calling the addAttrs method. |
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var attrs = { |
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// Add 3 attributes, foo, bar and foobar |
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"foo" : { |
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value:5 |
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}, |
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"bar" : { |
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value:"Hello World!" |
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}, |
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"foobar" : { |
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value:true |
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} |
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}; |
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this.addAttrs(attrs, cfg); |
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} |
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// Augment custom class with Attribute |
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Y.augment(MyClass, Y.Attribute); |
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function displayValues(o, title, node) { |
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var str = |
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'<div class="myclass"><div class="myclass-title">' |
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+ title + |
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'</div><ul class="myclass-attrs"><li>foo: ' |
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+ o.get("foo") |
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+ '</li><li>bar: ' |
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+ o.get("bar") |
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+ '</li><li>foobar: ' |
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+ o.get("foobar") |
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+ '</li></ul></div>'; |
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Y.one(node).set("innerHTML", str); |
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} |
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Y.on("click", function() { |
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// Create a new instance, but don't provide any initial attribute values. |
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var o1 = new MyClass(); |
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// Display current values |
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displayValues(o1, "o1 with default values, set during construction", "#createo1 .example-out"); |
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Y.on("click", function() { |
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// Update values, using the "set" method |
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o1.set("foo", 10); |
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o1.set("bar", "Hello New World!"); |
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o1.set("foobar", false); |
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displayValues(o1, "o1 values updated using set, after construction", "#updateo1 .example-out"); |
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}, "#updateo1 .do"); |
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}, "#createo1 .do"); |
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Y.on("click", function() { |
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var o2 = new MyClass({ |
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foo: 7, |
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bar: "Aloha World!", |
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foobar: false |
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}); |
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displayValues(o2, "o2 values set during construction", "#createo2 .example-out"); |
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}, "#createo2 .do"); |
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}); |
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</script> |
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<!--END SOURCE CODE FOR EXAMPLE =============================== --> |
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</body> |
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</html> |