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Re: To catch an exception

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"Tom de Neef" <tdeneef@qolor.nl> wrote:
> Can someone indicate what I do wrong here:
> {code}
> 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) };
>          }
>       }
>     }
>   }
> }
> 
> {/code}
> 
> The aim of the function is to remove style rules and it does what it
> is meant to do in IE and Chrome. Not so in FF. When the indicated
> statement is executed, FF will just give up. It jumps out of the
> function and out of the calling functions when the k-loop has reached
> the bottom sheet (with the 'fixed' styles loaded from an external
> stylesheet). Try..catch around help since then the function terminates
> properly and execution will continue. But why are they necessary? I
> have no idea how to read 'err' in FF.
> TIA
> Tom 

The statement in the disabled try...catch shouldn't cause problem. What's 
the exact exception error message when it occurs?

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Thread

To catch an exception "Tom de Neef" <tdeneef@qolor.nl> - 2012-12-17 09:50 +0100
  Re: To catch an exception Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-12-17 10:44 +0100
    Re: To catch an exception JJ <jaejunks@nah.meh> - 2012-12-17 10:07 +0000
    Re: To catch an exception "Tom de Neef" <tdeneef@qolor.nl> - 2012-12-17 15:23 +0100
      Re: To catch an exception Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-12-17 15:33 +0100
        Re: To catch an exception John G Harris <john@nospam.demon.co.uk> - 2012-12-17 15:28 +0000
          Re: To catch an exception Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-12-17 17:32 +0100
            Re: To catch an exception John G Harris <john@nospam.demon.co.uk> - 2012-12-18 17:01 +0000
              Re: To catch an exception Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-12-29 14:41 +0100
                Re: To catch an exception Dr J R Stockton <reply1252@merlyn.demon.co.uk.invalid> - 2012-12-30 16:23 +0000
            Re: To catch an exception Dr J R Stockton <reply1251@merlyn.demon.co.uk.invalid> - 2012-12-18 16:35 +0000
              Re: To catch an exception Andrew Poulos <ap_prog@hotmail.com> - 2012-12-19 22:15 +1100
      Re: To catch an exception Patricia Shanahan <pats@acm.org> - 2012-12-17 07:18 -0800
  Re: To catch an exception JJ <jaejunks@nah.meh> - 2012-12-17 10:04 +0000
    Re: To catch an exception "Tom de Neef" <tdeneef@qolor.nl> - 2012-12-17 14:48 +0100
      Re: To catch an exception Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-12-17 15:25 +0100
  Re: To catch an exception Tim Streater <timstreater@greenbee.net> - 2012-12-17 16:03 +0000
  Re: To catch an exception Scott Sauyet <scott.sauyet@gmail.com> - 2012-12-18 08:26 -0800
  Re: To catch an exception Bart Van der Donck <bart@nijlen.com> - 2012-12-30 08:42 -0800

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