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POjquery .addClass to set up another function using new class
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  1. POjquery .addClass to set up another function using new class
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    copied!<p>I'm working on a drawing app and running into some trouble with the use of .addClass. What I'm trying to do is send a new class to a menu item that I can then use to run a function which clears my canvas. I can make the list item invoke the function on its own when the class is preset to 'new_file', but I would like to have it inactive until some drawing is done on the canvas. My idea was to use .addClass when a mousedown is detected on the canvas, but it's not working out as planned. Other ideas for how to accomplish this are encouraged as well. Here's some code:</p> <p>This code from my canvas.js file clears the canvas when the list item with class 'new_file' is clicked.</p> <pre><code> $(document).ready(function(){ $('.new_file').mousedown(function(){ clearCanvas(); }); function clearCanvas(){ context.clearRect(0, 0, canvas.width(), canvas.height()); } }); </code></pre> <p>This is what I tried for adding the class; it's in my 'head' for now:</p> <pre><code> &lt;script&gt; $(document).ready(function(){ $("#myCanvas").click(function() { //tried .mousedown; did nothing $("#clear").addClass("new_file"); }); }); &lt;/script&gt; </code></pre> <p>This is the list item I'm trying to manipulate:</p> <pre><code> &lt;li id="clear"&gt;Clear&lt;/li&gt; </code></pre> <p>And my canvas:</p> <pre><code> &lt;canvas class="canvaso" id="myCanvas" height="239" width="414"&gt;&lt;/canvas&gt; &lt;script type="text/javascript" src="canvas.js"&gt;&lt;/script&gt; </code></pre> <p>I tried testing various edits while observing firebug but it seems like "new_file" isn't being added to the list item. Also tried changing #myCanvas and testing other IDs on the page but still couldn't get new_file added. Stumped.</p>
 

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