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copied!<p>As Bergi says in the comments above, it looks like the script did not load or execute early enough.</p> <p><strong>ONE POSSIBLE SOLUTION...</strong></p> <p>To make sure it is, you should declare the YUI script tag in the head of your HTML. Try that first to see if it solves your problem. However...</p> <p>...</p> <p><strong>WAITING UNTIL READY</strong></p> <p>You should put your other code in the head too, but specify it so that it only loads when the whole document has loaded.</p> <p>The simplest way to do this would be:</p> <pre><code>window.onload = function () { // what to do when window has loaded YUI().use("node", "io", "json-parse",function (Y) { // ... the code in your callback function, as provided above ... }); // end callback -- UPDATED }; // end window onload function </code></pre> <p>YUI has its own way of handling code that should when the document is ready...</p> <pre><code>YAHOO.util.Event.onDOMReady </code></pre> <p>But as your problem is with <code>YUI</code> not being defined, I'm not sure this will help.</p> <p>...</p> <p><strong>CHECKS AND SAFEGUARDS PATTERN?</strong></p> <p>A more sophisticated pattern could involve setting an intermittent check to see if <code>YUI</code> is defined and then cancelling the check once it is and executing the code you need. That would use a method called <code>setInterval()</code> and look something like this:</p> <pre><code>var checkYUI = setInterval(function() { // create a function to be executed within the interval and assign the interval to a global variable if (YUI) { // check the global variable `YUI` exists clearInterval(checkYUI); // cancel the interval check YUI().use("node", "io", "json-parse",function (Y) { // now we know `YUI` exists call its `use()` method // ... the code in your callback function, as provided above ... } } }, 100); // checks every 100 ms </code></pre> <p>You could make the checking more complicated still by, for example, checking that <code>YUI</code> is an object, that it has a <code>use()</code> method, etc. But hopefully this will suffice to show how it could work.</p> <p>I'm not sure what you did in your previous trials that made them succeed whilst this one failed but it might be worth studying them to see if such checks/safeguards are already in place.</p>

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