[thelist] javscript variables question - easy one

[Chris.Marsh at Callserve.com]

> Brian Delaney / 2005-02-09 17:50
> > so I declared global variables: globalStart globalEnd
> > I pass these to datecheck datecheck(globalStart, globalEnd) 
> from the 
> > main function main()
> > 
> > if both fields are not = NULL then I assign:
> > 
> > globalStart = globaStart + form.txtStartdate.value
> > globalEnd = globalEnd + form.txtEnddate.value
> > 
> > If i use the alert() to display the value of  these in the 
> datecheck() 
> > they are correct.
> > 
> > If i use the alert() in the main() calling function they 
> display NULL - 
> > blank values.
> 
> There is no need to pass the variables like this:
> datecheck(globalStart, globalEnd);
> as they are already available for the function (they are global).
> Just call:
> datecheck();
> and manipulate globalStart and globalEnd there.
> 
> If you define your function like this:
> function datecheck(globalStart, globalEnd)
> then you declare two local variables (globalStart and globalEnd) for 
> that function, and as they have the same names as global 
> variables, the 
> function has no access to those global variables, only to local.

I found this interesting:

<http://c2.com/cgi/wiki?GlobalVariablesAreBad>

Regards

Chris Marsh 

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