[Javascript] variable undefined problem

[walter at torres.ws (Walter Torres)]

sure, increament *after* you get the item needed.

You are doing it *before*

This means you will *never* get 'item0' and you will always ask for ONE past
the end.

walter


> -----Original Message-----
> From: javascript-bounces@xxxxxxxxxx
> [mailto:javascript-bounces@xxxxxxxxxx]On Behalf Of hypersdc@xxxxxxx
> Sent: Friday, May 23, 2003 11:48 AM
> To: [JavaScript List]
> Subject: Re: [Javascript] variable undefined problem
>
>
> Ok. But how should I fix that. Any recommendations?
> I'm trying to get the variable values from the external file
> without knowing
> how many items are in the list.
>
> Thanks
> ----- Original Message -----
> From: "Rodney Myers" <rodney@xxxxxxxxxxxxxxxx>
> To: "[JavaScript List]" <javascript@xxxxxxxxxx>
> Sent: Saturday, May 24, 2003 2:10 AM
> Subject: Re: [Javascript] variable undefined problem
>
>
> > Hello,
> >
> > As the while loop starts with a valid itemCheck variable it should cycle
> > until the last valid variable.
> > But inside the loop you have
> >
> > x = "item" + i;
> > itemCheck =eval(x);
> >
> >
> > if itemN was the last valid item, and so permitted entry to the loop
> > the N+1 is guaranteed to be undefined.
> >
> > hth
> >
> > Rodney
> >
> >
> > hypersdc@xxxxxxx wrote:
> >
> > >I'm having problems with a variable undefined error.
> > >
> > >I'm grabbing a set of variables from a file (.js file). I'm cycling
> through
> > >the variables with a while statement. The problem I'm having
> is the last
> > >variable is getting an undefined. How can I fix the code so
> this doesn't
> > >happen.
> > >
> > >//Start Code:
> > >
> > >var i = 0;
> > >var itemCheck = item0;
> > >while(window.itemCheck)
> > >{
> > >
> > >  document.write("<A HREF=" + itemCheck + ">" + itemCheck +
> "<BR></A>" );
> > >
> > >   i++;
> > >x = "item" + i;
> > >itemCheck =eval(x);
> > >
> > >if (typeof eval(x) == 'undefined')
> > >    alert('2 Undefined');
> > >else
> > >    alert('2 okay');
> > >itemCheck =eval(x);
> > >
> > >
> > >}
> > >
> > >
> > >//End code
> > >
> > >//js content
> > >var item0 = "name 1";
> > >var item1 = "name 2";
> > >
> > >//end js file content
> > >
> > >Thanks in advance
> > >
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> > >
> > >
> > >
> >
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> >
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