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How to find the width of an image before it loads.

Posted on 2014-07-25
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Last Modified: 2014-07-25
I need to know the width of an image before it is called in the html source. I know the name of the image and I'm trying to use javascript to discover the width. This returns a vale of 0 for the width.


var img = new Image();
img.src = "http://mysite.com/graphics/myimage.png"
window.confirm(img.width);
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Question by:Gary Samuels
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2 Comments
 
LVL 21

Assisted Solution

by:Randy Poole
Randy Poole earned 250 total points
ID: 40219655
There is no way to know before it is loaded.  You can however catch this info before you add it to your page and do what needs to be done:
img = new Image();
img.onload = function() {
  alert("(" + this.width + "x" + this.height+")");
};
img.src = "http://mysite.com/graphics/myimage.png";

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LVL 13

Accepted Solution

by:
duncanb7 earned 250 total points
ID: 40219721
You can do get the image width before adding it into DOM

Duncan    
<script type="text/javascript">
var getImageSize = function(src) {
    var img = new Image();
    $(img).bind('load', function(e) {
        var height = img.height;
        var width = img.width;
      //  document.write('width:' + width + ', height: ' + height);
	  alert("width="+width);
    });
    img.src = src;
};	
getImageSize('http://localhost/data/php/water.jpg');
</script>

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