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POHow to embed Javascript widget that depends on jQuery into an unknown environment
 

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    <p>I'm developing a javascript widget that depends on jQuery. The widget may or may not be loaded onto a page that already has jQuery loaded. There are many problems that come up in this case...</p> <ol> <li><p>If the web page does not have jQuery, I must load my own jQuery. There seems to be a delicate timing issue when doing this, however. For example, if my widget loads and executes before jQuery is finished loading and executing, I get a <code>jQuery is not defined</code> error.</p></li> <li><p>If the web page does have jQuery, I can usually work with it. If the jQuery version is old, however, I would like to load my own. If I do load my own, however, I need to do it in such a way as to not stomp on their <code>$</code> variable. If I set <code>jQuery.noConflict()</code> and any of their scripts depend on <code>$</code>, then I have just broken their page.</p></li> <li><p>If the web page uses another javascript library (e.g. prototype), I needed to be sensitive of prototype's <code>$</code> variable also.</p></li> </ol> <p>Because of all of the above, it is seeming easier to not depend on jQuery. But before I go down that road, which will involve mostly rewriting my widget code, I wanted to ask for advice first.</p> <p>The basic skeleton of my code, including the timing bug and sometimes <code>$</code> bugs, follows:</p> <pre><code>&lt;script type="text/javascript" charset="utf-8"&gt; // &lt;![CDATA if (typeof jQuery === 'undefined') { var head = document.getElementsByTagName('head')[0]; var script = document.createElement('script'); script.type = 'text/javascript'; script.src = '{{ URL }}/jquery.js'; head.appendChild(script); } // ]]&gt; &lt;/script&gt; &lt;script type="text/javascript" src="{{ URL }}/widget.js"&gt;&lt;/script&gt; </code></pre> <p>My widget has the following structure:</p> <pre><code>(function($) { var mywidget = { init: function() { ... } }; $(document).ready(function() { mywidget.init(); }); })(jQuery); </code></pre> <p>If there are any pointers or resources for achieving a widget that can work in all the mentioned environments, they would be greatly appreciated.</p>
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