[Javascript] Check boxs and table row back ground colors

[mdougherty at pbp.com (Mike Dougherty)]

You solution works fine in your example.

the regexp is a handy way to generalize the solution to work on elements that already have a 
className that you might not even know about - or if the element is being acted on by multiple 
classes, each of which correspond to javascript behaviors.

I agree that you should use what you know - it makes debugging easier when things go wrong.  If 
your apps start to scale up, knowing about the generalized solution reminds you what to look up at 
google.

On Wed, 26 Apr 2006 08:29:01 +1000
  "Abyss - Information" <Info@xxxxxxxx> wrote:
> hey all thank you for all your great help...
> 
> This is the function which I eventually end up with for the question on..
> 
> 
> 
> function jsfncCheckboxBackgroundColor(chkRow)
> {
>  var theRow = chkRow.parentNode;
>  //Make sure you are on the row element
>  while (theRow.nodeName != "TR")
>   {
>      theRow = theRow.parentNode;
> 
>   }
>  if(chkRow.checked)
>   {
>    theRow.className = "TableCheckboxChecked";
>   }
>  else
>   {
>    theRow.className = "TableCheckboxUnChecked";
>   }
> }
> 
> 
> why would i want to put in a regular expression in it? rather not why..i understand why- as 
>such...but where to put it? and would it make that much more of a difference if i didn't put it 
>in?
> 
> 
> ----- Original Message ----- From: "Nick Fitzsimons" <nick@xxxxxxxxxxxxxx>
> To: "[JavaScript List]" <javascript@xxxxxxxxxx>
> Sent: Wednesday, April 26, 2006 2:00 AM
> Subject: Re: [Javascript] Check boxs and table row back ground colors
> 
> 
>> Steve Clay wrote:
>>> Tuesday, April 25, 2006, 11:06:32 AM, Mike Dougherty wrote:
>>>
>>>>loTR.className = loTR.className.replace(/\shighlighted/g,""); /* remove the class */
>>>>Note:  that regexp is probably not 100% right (sorry)
>>>
>>>
>>> /\s*\bhighlighted\b/g
>>>
>>> \s* = zero or more whitespace chars
>>> \b = word boundaries ensure not inside another word
>>>
>>> invaluable regular expression workbench:
>>> http://osteele.com/tools/rework/
>>>
>>> Steve
>>
>> Unfortunately word boundaries can occur within classNames, as they include 
>> hyphens, meaning the above would incorrectly find a match on
>>
>> class="highlighted-blob"
>>
>> instead of just
>>
>> class="highlighted".
>>
>> Use:
>> /(^|\\s)highlighted(\\s|$)/g
>>
>> which will match "highlighted" in the cases of:
>>
>> 1. At start of string followed by whitespace;
>> 2. At end of string preceded by whitespace;
>> 3. At start and end of string - that is, there is no whitespace anywhere.
>>
>> Not my own work - see the comments in Robert Nyman's "Ultimate 
>> getElementsByClassName", particularly:
>> <http://www.robertnyman.com/2005/11/07/the-ultimate-getelementsbyclassname/#comment-1583>
>>
>> Cheers,
>>
>> Nick.
>> -- 
>> Nick Fitzsimons
>> http://www.nickfitz.co.uk/
>>
>>
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>> https://lists.LaTech.edu/mailman/listinfo/javascript
>> 
> 
> 
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> 6:31:22 PM ET - 4/25/2006