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Groups > comp.lang.javascript > #31279

Re: restore window alert

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On Thursday, September 8, 2016 at 6:47:29 AM UTC-5, JJ wrote:
> On Thu, 8 Sep 2016 10:39:16 +1000, Andrew Poulos wrote:
> > A third party elearning output I'm required to modify has, in a giant 
> > JavaScript file, overridden window.alert. The original value for 
> > window.alert has not been stored.
> > 
> > I cannot modify the JavaScript file directly (each time the elearning is 
> > published it recreates the file with whatever it deems necessary) so I 
> > have to add a new file.
> > 
> > Any custom JavaScript I add can only go after their JavaScript.
> > 
> > Is there any way to reference the native window.alert once its been 
> > overridden?
> > 
> > Andrew Poulos
> 
> Use:
> 
>   window.constructor.prototype.alert
> 
> e.g.:
> 
>   window.constructor.prototype.alert.call(window, "the message");
> 
> or restore it as a different name for easy access later e.g.:
> 
>   window.alert2 = window.constructor.prototype.alert;
>   window.alert2("the message");


I like this solution better than mine, but I'm paranoid about using "window.constructor". I see it in my mind as: 
[host object].constructor

Is this "safe" to us like this?

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restore window alert Andrew Poulos <ap_prog@hotmail.com> - 2016-09-08 10:39 +1000
  Re: restore window alert "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2016-09-07 18:00 -0700
  Re: restore window alert JJ <jj4public@vfemail.net> - 2016-09-08 18:47 +0700
    Re: restore window alert "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2016-09-08 06:43 -0700
      Re: restore window alert Martin Honnen <martin.honnen@gmx.de> - 2016-09-08 16:32 +0200
        Re: restore window alert Andrew Poulos <ap_prog@hotmail.com> - 2016-09-09 14:49 +1000
          Re: restore window alert "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2016-09-09 06:20 -0700
      Re: restore window alert Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-09-10 16:26 +0200
        Re: restore window alert Ram Tobolski <ramtob@gmail.com> - 2016-09-11 00:17 -0700
          Re: restore window alert Andrew Poulos <ap_prog@hotmail.com> - 2016-09-11 17:57 +1000
          Re: restore window alert Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-09-11 11:19 +0200
        Re: restore window alert Andrew Poulos <ap_prog@hotmail.com> - 2016-09-11 19:00 +1000
          Re: restore window alert Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-09-11 13:24 +0200

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