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2011-01-18T03:30:13.067
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<p>YUI2 and YUI3 are really very different. As different as plain javascript vs jQuery.</p> <p>Here's an example of setting the background color of all elements of a given class to red to illustrate the difference.</p> <h2>First in YUI2:</h2> <pre><code><script src="http://yui.yahooapis.com/2.8.2r1/build/yahoo/yahoo-min.js"></script> <script src="http://yui.yahooapis.com/2.8.2r1/build/dom/dom-min.js"></script> <script> var YDom = YAHOO.util.Dom; YDom.setStyle(YDom.getElementsByClassName('test'),'background-color','red'); </script> </code></pre> <h2>Now in YUI3:</h2> <pre><code><script src="http://yui.yahooapis.com/3.3.0/build/yui/yui-min.js"></script> <script> YUI().use('node',function(Y){ Y.all('.test').setStyle('background-color','red'); }); </script> </code></pre> <p>Notice the main differences:</p> <ul> <li><p>In YUI2 you include the needed modules yourself using the <code><script></code> tag. In YUI3 you only include one script file with the <code><script></code> tag and load all the rest using <code>YUI().use</code>. In the example above we use the <code>node</code> module in YUI3. YUI2 does have a module that can do the auto loading but it is a separate module itself and not built-in to the YAHOO global object.</p></li> <li><p>YUI2 is traditional imperative programming: <code>foo(bar())</code> while YUI3 uses chaining.</p></li> <li><p>YUI3 forces you to write all YUI related code inside a function therefore running in its own scope and exposes only the <code>YUI</code> object to the global scope. This is basically ninja mode in other libraries.</p></li> </ul>
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1. POHow different is YUI 3 to YUI 2 to start learning?
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1. COThanks for the detailed explanation. You made many things clear to me. I will be grateful if you can suggest a good starting point for me as well.
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