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Message-ID: <1393459.e97MPUDCx7@PointedEars.de>
From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To: Thomas 'PointedEars' Lahn <cljs@PointedEars.de>
Organization: PointedEars Software (PES)
Date: Mon, 17 Dec 2012 15:25:18 +0100
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Subject: Re: To catch an exception
Newsgroups: comp.lang.javascript
References: <50cedccc$0$6950$e4fe514c@news2.news.xs4all.nl> <XnsA12CAE7AFCC69jj@0.0.0.15> <50cf22cc$0$6847$e4fe514c@news2.news.xs4all.nl>
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Tom de Neef wrote:

> "JJ" <jaejunks@nah.meh> schreef […]
>> "Tom de Neef" <tdeneef@qolor.nl> wrote:
>>> Can someone indicate what I do wrong here:
>>> {code}
    ^^^^^^
BTW, this is unnecessary and distracting here.

>>> function removeStyleElement(scope) {
>>>   var sheets = document.styleSheets,k,sheet,rules,j,rule,s;
>>>   scope = scope.toLowerCase();
>>>   for (k=sheets.length-1;k>=0;k--) {  // skip the 'fixed' styles in
>>>   sheet[0]
>>>     sheet = sheets[k];
>>> //    try {
>>>       rules = (sheet.cssRules)?sheet.cssRules:sheet.rules;  //<<=====
>>> //    }
>>> //    catch (err) {return};
>>>     if (rules) {
>>>       for (j=0;j<rules.length;j++) {
>>>          rule = rules[j];
>>>          s = (rule.selectorText)?rule.selectorText:rule;
>>>          if (s.toLowerCase() == scope) {
>>>            if (sheet.removeRule) {sheet.removeRule(j)}
>>>            else { if (sheet.deleteRule) sheet.deleteRule(j) };
>>>          }
>>>       }
>>>     }
>>>   }
>>> }
>>> […]
>> 
>> The statement in the disabled try...catch shouldn't cause problem. What's
>> the exact exception error message when it occurs?
> 
> There is no error message. When FF reaches that line, it jumps out and
> stops execution (doesn't pick up in an enclosing block).

Highly unlikely.

> With the try .. catch included, it will jump to the catch statement. But I
> do not know how to get information from the 'err' object.

By inspecting it?  By document.write()ing, window.alert()ing, 
console.log()ing it before you return?

> The debugger doesn't show it.

It should, and it does, unless its not showing it is related to your bad 
code style (you have the “catch” keyword, its /Block/ statement, and the 
“return” statement in the block on the same line).


PointedEars
-- 
Danny Goodman's books are out of date and teach practices that are
positively harmful for cross-browser scripting.
  -- Richard Cornford, cljs, <cife6q$253$1$8300dec7@news.demon.co.uk> (2004)