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Groups > comp.lang.javascript > #38662

Re: missing image error

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Andrew Poulos wrote:

> let img = new Image();
> 
> img.src = 'images/' + name + '.jpg';
> img.setAttribute("onerror", "this.onerror=null;
  ^^^^^^^^^^^^^^^^^^^^              ^^^^^^^
> this.src='images/imagenotfound.png'");

Yuck.  

  img.onerror = function () {
    this.onerror = null;
    this.src = 'images/imagenotfound.png';
  };

Obviously the compatibility of this is at least as good as the compatibility 
of the original code.

However, for this to work reliably, as always, the event listener has to be 
defined *before* the property is changed that can fire the event:

  img.onerror = …;
  img.src = 'images/' + name + '.jpg';

> Is there a way to trap the 404 so it doesn't show in the console?

Unlikely.
 
> Or is there some other way I can try to get the image and thereby be
> able to trap the 404?

XMLHttpRequest/Fetch API.

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Thread

missing image error Andrew Poulos <ap_prog@hotmail.com> - 2020-08-04 14:58 +1000
  Re: missing image error Arno Welzel <usenet@arnowelzel.de> - 2020-08-04 10:29 +0200
    Re: missing image error James Kirk <noneya.invalid@gmail.com> - 2020-08-04 22:38 -0400
      Re: missing image error Arno Welzel <usenet@arnowelzel.de> - 2020-08-05 07:49 +0200
  Re: missing image error Julio Di Egidio <julio@diegidio.name> - 2020-08-04 02:18 -0700
    Re: missing image error Andrew Poulos <ap_prog@hotmail.com> - 2020-08-05 13:20 +1000
  Re: missing image error Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2020-08-05 08:44 +0200
    Re: missing image error Andrew Poulos <ap_prog@hotmail.com> - 2020-08-05 18:02 +1000
      Re: missing image error Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2020-08-05 10:18 +0200
      Re: missing image error Julio Di Egidio <julio@diegidio.name> - 2020-08-05 02:36 -0700

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