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POHTML5 canvas, save as image, toDataURL(), create ID
 

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    <p>I have this little JavaScript canvas snippet:</p> <pre><code>(function() { // Creates a new canvas element and appends it as a child // to the parent element, and returns the reference to // the newly created canvas element function createCanvas(parent, width, height) { var canvas = {}; canvas.node = document.createElement('canvas'); canvas.context = canvas.node.getContext('2d'); canvas.node.width = width || 100; canvas.node.height = height || 100; parent.appendChild(canvas.node); return canvas; } function init(container, width, height, fillColor) { var canvas = createCanvas(container, width, height); var ctx = canvas.context; // define a custom fillCircle method ctx.fillCircle = function(x, y, radius, fillColor) { this.fillStyle = fillColor; this.beginPath(); this.moveTo(x, y); this.arc(x, y, radius, 0, Math.PI * 2, false); this.fill(); }; ctx.clearTo = function(fillColor) { ctx.fillStyle = fillColor; ctx.fillRect(0, 0, width, height); }; ctx.clearTo(fillColor || "#ddd"); // bind mouse events canvas.node.onmousemove = function(e) { if (!canvas.isDrawing) { return; } var x = e.pageX - this.offsetLeft; var y = e.pageY - this.offsetTop; var radius = 10; // or whatever var fillColor = '#ff0000'; ctx.fillCircle(x, y, radius, fillColor); }; canvas.node.onmousedown = function(e) { canvas.isDrawing = true; }; canvas.node.onmouseup = function(e) { canvas.isDrawing = false; }; } var container = document.getElementById('canvas'); init(container, 200, 200, '#ddd'); })(); </code></pre> <p>Now it takes the div with the <code>id</code> of <code>canvas</code>, and creates a little HTML5 <code>canvas</code> inside it, where the user can basically draw with their mouse. NOW thats nice... but what if I had to save whats inside the canvas with <code>canvas.toDataURL()</code>? As far as I know, I would have to take the canvas, and do the <code>canvas.toDataURL()</code> to save it to an image. But- that needs an ID right? SOOOO when I created the canvas in the <code>createCanvas</code> function, how would I make an <code>id</code> accompanying it, so I could do something like <code>document.getElementById("idofcanvas").toDataURL()</code> ?</p> <p>Thank you in advance for your help! :)</p>
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