take screen shot using only js in firefox extension

I am thinking of building a firefox extension. This extension requires the ability of performing screen shots. Is it possible doing so only using javascript?

-------------Problems Reply------------

If you mean a screenshot of firefox's window, yes, and it's so easy it hurts. You have to render it into a canvas. See https://developer.mozilla.org/en/drawing_graphics_with_canvas#Rendering_Web_Content_Into_A_Canvas

<canvas id='my-canvas'></canvas>
var canvas = document.getElementById('my-canvas');
var ctx = canvas.getContext("2d");
// Draw the window at the top left of canvas, width=100, height=200, white background
ctx.drawWindow(window, 0,0, 100, 200, "rgb(255,255,255)");
// Open another window with the thumbnail as an image

If you mean a screenshot of the entire desktop, I don't think so

Category:javascript Views:0 Time:2011-01-19

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