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 08:25:24 +0100
Organization	PointedEars Software (PES)
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Thomas 'PointedEars' Lahn wrote:

> Because not only “new CustomEvent(theEvent)” may throw an exception, you 
> should not simply handle all exceptions caused by this statement with the 
> catch code, but only the specific one.  Since there is no compatible way 
> to catch only a specific type of exception (AFAIK only Mozilla JavaScript
> has a way, see the ES Matrix), you should rethrow the exception if it is
> not the one that you want to handle.  For example:
> 
>   try {
>     elem.dispatchEvent(new CustomEvent(theEvent));
>   } catch (err) {
>     if (!(err instanceof TypeError)) throw err;
> 
>     var evt = document.createEvent("CustomEvent");
>     evt.initCustomEvent(theEvent, true, false, {});
>     elem.dispatchEvent(evt);
>   }

Also, DRY:

  var evt = null;

  try {
    evt = new CustomEvent(eventType);
  } catch (err) {
    if (!(err instanceof TypeError)) throw err;

    evt = document.createEvent("CustomEvent");
    if (evt) evt.initCustomEvent(eventType, true, false, {});
  }

  if (evt) {
    try {
      elem.dispatchEvent(evt);
    } catch (e) {
      console.error(e);
    }
  }

-- 
PointedEars
FAQ: <http://PointedEars.de/faq> | <http://PointedEars.de/es-matrix>
<https://github.com/PointedEars> | <http://PointedEars.de/wsvn/>
Twitter: @PointedEars2 | Please do not cc me./Bitte keine Kopien per E-Mail.

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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