[Javascript] dynamic variables names

[Chris Tifer]

Use the images collection. Avoid eval whenever possible...

Did my posts not make it to the list?


----- Original Message -----
From: "Marcelo Simon" <grillo at lazzuri.com.br>
To: "[JavaScript List]" <javascript at LaTech.edu>
Sent: Tuesday, June 24, 2003 2:55 PM
Subject: Re: [Javascript] dynamic variables names


> Almost !!!
>
> using eval(); i got the first part correct, now alert(eval("nt_0"+i).src)
> traces to the correct image, but now when I mouse over, the browser is
> showing me an syntax error that I can't find.
>
> sorry to bother again, but does anyone has a clue, on how to fix it ?
>
> function nota(numero){
>  for ( var i=1; i < 6; i++){
>   if ( i <= numero ){
>    eval("nt_0"+i).src = eval("../_img/1_nota_0"+i+"_on.gif");
>   } else {
>    eval("nt_0"+i).src = eval("../_img/1_nota_0"+i+"_on.gif");
>   }
>  }
> }
>
> Thanks again to everyone for their patience :)
> Marcelo Simon
>
> ----- Original Message -----
> From: "Peter Brunone" <peter at brunone.com>
> To: "[JavaScript List]" <javascript at LaTech.edu>
> Sent: Tuesday, June 24, 2003 3:38 PM
> Subject: Re: [Javascript] dynamic variables names
>
>
> > Marcelo,
> >
> >    I'm not sure if this will completely answer your question, but you
can
> create Javascript code from a string using the eval() function... so if
you
> want to refer to an image called 'myGif', you can set a variable equal to
> eval('myGif') and then call that variable's .src property.  Of course, you
> can also use the available collections and getElementByID as Chris has
shown
> below.
> >
> > Regards,
> >
> > Peter
> >
> > ---------- Original Message ----------------------------------
> > From: "Marcelo Simon" <grillo at lazzuri.com.br>
> > Reply-To: "[JavaScript List]" <javascript at LaTech.edu>
> > Date:  Tue, 24 Jun 2003 14:44:25 -0300
> >
> > >Thanks for the answers, but they didn't solve my problem.
> > >
> > >I didn't post the entire function, and that's why I think you say that
I
> don't have a dynamic variable name. ( or maybe I'm wrong ), here's the
> function
> > >
> > >function note(number){
> > > for ( var i=1; i < 6; i++){
> > >  if ( i <= number ){
> > >  alert(['nt_0'+i].src); // it's tracing undefined
> > >   ['nt_o'+i].src = '../_img/1_note_0'+i+'_on.gif';
> > >  } else {
> > >   ['nt_o'+i].src = '../_img/1_note_0'+i+'_off.gif';
> > >  }
> > > }
> > >}
> > >
> > >what I'm trying to accomplish, is to change some images from 1 to i
based
> on the number I pass to the function (ie. if I pass 3, I want images 1,2
and
> 3 to be on and 4 and 5 to be off ), so if someone has a different approach
> to this please share.
> > >
> > >Thanks again
> > >Marcelo Simon
> > >
> > >  ----- Original Message -----
> > >  From: Chris Tifer
> > >  To: [JavaScript List]
> > >  Sent: Tuesday, June 24, 2003 1:10 PM
> > >  Subject: Re: [Javascript] dynamic variables names
> > >
> > >
> > >  Do you have a dynamic variable name? I would never use a
> > >  dynamic variable to be honest with you - or at least haven't ever
> > >  found the need for one yet, but from the looks of it below, you
> > >  don't have a dynamic variable, but rather you're trying to build
> > >  a reference to an image dynamically.
> > >
> > >  To do that, use the document.images collection and
> > >  build your string when targeting a specific element in that
> > >  collection:
> > >
> > >  document.images["nt_o" + i].src = "path/to/image.gif"
> > >
> > >  That's not a dynamic variable name - just so you're aware.
> > >
> > >  Chris Tifer
> > >  http://emailajoke.com
> > >
> > >    ----- Original Message -----
> > >    From: Marcelo Simon
> > >    To: * Yahoo / Javascript
> > >    Sent: Tuesday, June 24, 2003 11:50 AM
> > >    Subject: [Javascript] dynamic variables names
> > >
> > >
> > >    Hi list,
> > >
> > >    It's me again, and I need some help again please.
> > >
> > >    how can I use dynamic variables name in JS ?
> > >
> > >    I mean, how do I evaluate the 2 parts so they work ?
> > >
> > >    if ( i <= number ){
> > >       ['nt_o'+i].src = '../_img/1_nota_0'+i+'_on.gif';
> > >    }
> > >
> > >    thanks in advance
> >
> > _______________________________________________
> > Javascript mailing list
> > Javascript at LaTech.edu
> > https://lists.LaTech.edu/mailman/listinfo/javascript
> >
> >
>
>
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