Is there a way for me to determine if an image created with Image() has had its source modified?

Is there a way to track changes in the src attribute of images created using the Image constructor on a webpage without needing the image to be fully loaded? I have attempted to override the Image.onload method, but it does not log anything:

Image.prototype.nativeOnload = Image.prototype.onload;
Image.prototype.onload  = function() {
  console.log(this.src);
  this.nativeOnload();
};

It seems that the onload property might be causing some issues. How can I achieve this using JavaScript without directly watching for changes?

javascript

Answer №1

THE FIRST CHOICE

The most straightforward option with minimal overhead is to incorporate a callback in the code that can modify the source of an image tag. This approach requires access to and the ability to make changes to the code itself.

A SECOND ALTERNATIVE

Another possibility is to establish a DOM event listener, although not all browsers may support this functionality.

DOMAttrModified

An earlier query on stackoverflow delves into this choice.

AN ADDITIONAL OPTION

A third method involves regularly checking the image source for any alterations compared to the previous assessment using an interval timer.

Explore a jsfiddle demonstration (click "change source" or adjust the source in firebug to test).

HTML

<img id="check" src="yourimagesource">

JavaScript

var check_img=$("#check");
var current_src=check_img.attr("src");


window.setInterval(function(){
    new_src=check_img.attr("src");
    if(current_src!=new_src){
        alert("src changed");
        current_src=new_src;
    }

}, 500);

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