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Javascript: image.onload function inside "class"

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I am messing with JavaScript a little. I have a "class", that represents image. Inside that class, I try to assign a function to image.onload event. 

			var Card = function(url,c){
				this.url = url;
				this.ctx = c;
				this.img = new Image();
				this.posxCurr = 0;
				this.posyCurr = 0;
				this.widthCurr = 100;
				this.heightCurr = 100;
				this.img.onload = this.imageLoaded.bind(this);
				this.img.src = this.url;

			Card.prototype = {
				imageLoaded : function(){
					//my goal is to initialize this.widthCurr and this.heightCurr
					this.widthCurr = this.img.width;
					this.heightCurr = this.img.height;

Basically I am trying to set widthCurr and heightCurr to actual size of the image after it is loaded. The function imageLoaded() seems not to be executed at all - there is no alert and when I draw the image, it is 100x100. What am I doing wrong?


Thanks for answers.


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Well, I was doing it without bind (just 

  1. this.img.onload = this.imageLoaded;

but it was not working so some guy gave me advice to to use bind. I looked it up but I can't make it work properly :( .

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