Re: custom event in IE

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From	Thomas 'PointedEars' Lahn <PointedEars@web.de>
Newsgroups	comp.lang.javascript
Subject	Re: custom event in IE
Date	Wed, 11 Jan 2017 04:09:22 +0100
Organization	PointedEars Software (PES)
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James Kirk wrote:

> Andrew Poulos <ap_prog@hotmail.com> wrote:
>> I used a try/catch and when it fails for IE the "catch" part uses
>> initCustomEvent
>> <https://msdn.microsoft.com/en-us/library/ff975987(v=vs.85).aspx>
>> to create the event:
> 
> I have always tried to avoid using try/catch. So just out of my own
> curiosity, why the try/catch over something liking to the function from:
> 
> [url]https://developer.mozilla.org/en-US/docs/Web/API/CustomEvent/CustomEvent#Polyfill[/url]

If the global object has no CustomEvent property in the MSHTML DOM, then 
such a polyfill would be a possibility.  If on the other hand it has such a 
property but the value of it just cannot be called a constructor, then the 
value would be a reference to a host object, and it would be unwise to try 
to overwrite the value.

> or testing in a similar fashion to that function.

You cannot determine whether a function can be called as a constructor 
unless you try it.

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PointedEars
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Thread

custom event in IE Andrew Poulos <ap_prog@hotmail.com> - 2017-01-10 12:08 +1100
  Re: custom event in IE Andrew Poulos <ap_prog@hotmail.com> - 2017-01-10 12:20 +1100
    Re: custom event in IE Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-01-10 02:45 +0100
      Re: custom event in IE Andrew Poulos <ap_prog@hotmail.com> - 2017-01-10 15:32 +1100
        Re: custom event in IE Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-01-10 12:53 +0100
          Re: custom event in IE Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-01-11 08:25 +0100
        Re: custom event in IE James Kirk <noneya.invalid@gmail.com> - 2017-01-10 21:52 -0500
          Re: custom event in IE Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-01-11 04:09 +0100
            Re: custom event in IE James Kirk <noneya.invalid@gmail.com> - 2017-01-11 21:31 -0500
              Re: custom event in IE Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-01-12 14:22 +0100
            Re: custom event in IE Scott Sauyet <scott@sauyet.com> - 2017-01-14 23:01 +0000
              Re: custom event in IE "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2017-01-15 09:51 -0800
                Re: custom event in IE Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-01-15 22:37 +0100
                Can we recognize Constructor Functions (was: custom event in IE) Scott Sauyet <scott@sauyet.com> - 2017-01-15 23:39 +0000
                Re: custom event in IE Scott Sauyet <scott@sauyet.com> - 2017-01-15 23:15 +0000
                Re: custom event in IE "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2017-01-15 22:36 -0800
                Re: custom event in IE Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-01-16 12:54 +0100
                Re: custom event in IE "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2017-01-16 14:18 -0800
                Re: custom event in IE Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-01-17 00:24 +0100

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