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POCanvas element can't be drawn on after jquery display transition
 

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  1. POCanvas element can't be drawn on after jquery display transition
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    <p>I'm creating a drawing app using canvas. It works fine if the div containing the canvas element is shown. However, I want to initially have the containing div hidden and then "launch" the drawing app using a jquery transition to fade in the drawing interface. So the containing div initially has its css 'display' property set to 'none' and then I show it. However, when I do this, the canvas element will no longer receive any drawing input. I've tried setting the display:none dynamically after the canvas element is rendered by my script to make sure there's no interference there, but no dice. Any suggestions?</p> <p>Here is the html structure for the drawing interface:</p> <pre><code>&lt;!--DRAWING INTERFACE--&gt; &lt;style&gt; #draw-container { display:none; width:1920px; height:1080px; position:absolute; top:0px; left:0px; } &lt;/style&gt; &lt;div id="draw-container"&gt; &lt;h1&gt;Send a Drawing&lt;/h1&gt; &lt;div id="draw" class="panel"&gt; &lt;/div&gt; &lt;div id="draw-buttons"&gt; &lt;a id="sendButton" href="#" class="round"&gt;&gt;&lt;/a&gt; &lt;a id="clearButton" href="#" class="round"&gt;+&lt;/a&gt; &lt;/div&gt; &lt;/div&gt; </code></pre> <p>Then this function gets called, which creates the canvas element as a child of the "draw" div:</p> <pre><code>//creating canvasses function drawCanvas(id,xOffset){ //draw var canvas = document.createElement("canvas"); canvas.width = canvasWidth; canvas.height = canvasHeight; canvas.id = id; $('#draw').append(canvas); } </code></pre> <p>And when a user clicks on a button to reveal the drawing module:</p> <pre><code>document.getElementById('drawLaunch').addEventListener("click", function(){ $('#draw-container').show(); }); </code></pre> <p>And finally, here's the drawing function:</p> <pre><code>function _drawCircle(mouseX, mouseY) { //get position var x = mouseX - offsetLeft, y = mouseY - offsetTop; //move mouse to the previous point if (lastX == null) { lastX = x; lastY = y; } context.moveTo(lastX,lastY); //draw line context.lineTo(x, y); context.stroke(); //set new last point lastX = x; lastY = y; </code></pre> <p>}</p> <p>Now, if I keep everything the same but just remove the 'display:none;" from the stylesheet so that the canvas is shown when the page is loaded, everything works fine. But if it's hidden and then shown, you can't draw on it.</p>
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