HTML canvas ImageData width Property

Introduction

Alert the width of an ImageData object: 

alert("Width of imgData is: " + imgData.width);

View in separate window 

<!DOCTYPE html>
<html>
<body>

<canvas id="myCanvas" width="300" height="180" style="border:1px solid #d3d3d3;">
Your browser does not support the HTML5 canvas tag.</canvas>

<p id="demo"></p>
<script>
var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");
var imgData = ctx.createImageData(100, 100);

document.getElementById("demo").innerHTML = "Width of imgData is: " + imgData.width;

var i;/*from w  w w . j  av  a  2  s .  com*/
for (i = 0; i < imgData.data.length; i += 4) {
  imgData.data[i+0] = 255;
  imgData.data[i+1] = 0;
  imgData.data[i+2] = 0;
  imgData.data[i+3] = 255;
}

ctx.putImageData(imgData, 10, 10);
</script>

</body>
</html>

The width property returns the width of an ImageData object, in pixels. 

imgData.width;



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