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    <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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    1. POYUI JSON - How do I Add New Object Members During Parsing?
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    1. COThanks for the help Guy. Previously, I did have the script declared in the head tag; but, I dropped it down by the code so I could easily associate the two for clarity - it did not seem to affect how the code loaded. I have now moved the script and code up to the head. Re: the window.onload function - I have included this line but the 'end callback' and 'end window onlioad function' brackets are throwing errors. Are these needed? Or, am I duplicating the existing YUI().use brackets? This line is concerning as it is not referenced in the Fiddle: Y.io('js/json-convert-values-response.json',{
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    2. CO@DaniB There was a small but significant mistake in my code. The closing parenthesis should have been to close the `use()` method but I had put it on the wrong line. I have corrected the code above now so that it shouldn't throw an error (look out for the comment which says `UPDATED`-- that's where the parenthesis has moved to). Hope that makes sense and works for you now. Let me know how you get on.
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    3. COFirstly, thanks again for your help. I am really struggling to place the 'end callback' and 'end window onlioad function' brackets into the correct place - I understand why they are needed; but, I'm a beginner so it would be great if you could be specific as I am just getting more errors. That said I have just cleared any further unnecessary links to CSS and JS out of the code. I am linked to the YUI combo JS and CSS and Firefox is NOW returning 'NO' errors - but the app won't run! Argh! Until you reply about the brackets I am going to look at what the 'try/ catch' is set to catch! Thanks
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