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Judson

2007-Jul-08 12:03 UTC

Prototype Doesn''t Play Well With Others?

When I call the script below with prototype.js included in the page, I
get a "target has no properties" error message.  If I take out
prototype, it works fine.  Can anyone explain this?


function changeTab(chosen)
      {
      var x;
      var tabs = new Array()
      tabs[0] = "one"
      tabs[1] = "two"
      tabs[2] = "three"
      tabs[3] = "four"
      tabs[5] = "five"
        for (x in tabs)
           {
            target = document.getElementById(tabs[x]);

             if (tabs[x] !== chosen)
                {
                    target.style.backgroundColor = ''#E7F1F8'';
                }
             else if (tabs[x] == chosen)
                {
          target.style.backgroundColor = ''white'';
                 }
      }


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Walter Lee Davis

2007-Jul-08 12:10 UTC

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Re: Prototype Doesn''t Play Well With Others?

Try using a different for loop, maybe for(i = 0; i < tabs.length; i++). 
There has been a ton of discussion on this list lately that for .. in 
loops are specific to objects, and using them on arrays is just wrong. 
You might have better luck with a different format for your loop.

Walter

On Jul 8, 2007, at 8:03 AM, Judson wrote:
>
> When I call the script below with prototype.js included in the page, I
> get a "target has no properties" error message.  If I take out
> prototype, it works fine.  Can anyone explain this?
>
>
> [snip]
>       tabs[5] = "five"
>         for (x in tabs)
>            {

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Judson

2007-Jul-08 12:27 UTC

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Re: Prototype Doesn''t Play Well With Others?

Thanks, Walter!  That really did the trick.

On Jul 8, 7:10 am, Walter Lee Davis
<w...-HQgmohHLjDZWk0Htik3J/w@public.gmane.org>
wrote:> Try using a different for loop, maybe for(i = 0; i < tabs.length; i++).
> Therehasbeen a ton of discussion on this list lately that for .. in
> loops are specific to objects, and using them on arrays is just wrong.
> You might have better luck with a different format for your loop.
>
> Walter
>
> On Jul 8, 2007, at 8:03 AM, Judson wrote:
>
>
>
> > When I call the script below with prototype.js included in the page, I
> > get a "targethasnoproperties" error message.  If I take out
> > prototype, it works fine.  Can anyone explain this?
>
> > [snip]
> >       tabs[5] = "five"
> >         for (x in tabs)
> >            {

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RobG

2007-Jul-09 12:07 UTC

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Re: Prototype Doesn''t Play Well With Others?

On Jul 8, 10:03 pm, Judson
<judsonmitch...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> When I call the script below with prototype.js included in the page, I
> get a "target has no properties" error message.  If I take out
> prototype, it works fine.  Can anyone explain this?
>
> function changeTab(chosen)
>       {
>       var x;
>       var tabs = new Array()
>       tabs[0] = "one"
>       tabs[1] = "two"
>       tabs[2] = "three"
>       tabs[3] = "four"
>       tabs[5] = "five"
Consider using an Array literal:

  var tabs =
["one","two","three","four","five"];

>         for (x in tabs)
Prototype.js extends the built-in Array object''s methods, a for..in
loop will return those methods too.  Use a normal for loop:

  var target;
  for (var i=0, len=tabs.length; i<len; i++){
    target = document.getElementById(tabs[x]);

>            {
>             target = document.getElementById(tabs[x]);
>
>              if (tabs[x] !== chosen)
>                 {
>                     target.style.backgroundColor =
''#E7F1F8'';
>                 }
>              else if (tabs[x] == chosen)
>                 {
>           target.style.backgroundColor = ''white'';
>                  }
You can replace all that with:

    target.style.backgroudColor =
(tabs[x]==chosen)?''white'':''#E7F1F8'';


Though you might try Prototype.js''s Array.prototype.each() method.


--
Rob


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parry.luke-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org

2007-Jul-09 14:26 UTC

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Re: Prototype Doesn''t Play Well With Others?

Hey there,

Looking at the error it seems that document.getElement.byId() isn''t
working, but why aren''t you using the $() helper?, not sure if that
causes conflicts. This may be happening because ever the elements
don''t exist, named wrong,

however you aren''t actually using anything from prototype js, and I
would sincerly recommend you look at the api docs.

Mr Parry.





On Jul 8, 1:03 pm, Judson
<judsonmitch...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> When I call the script below with prototype.js included in the page, I
> get a "target has no properties" error message.  If I take out
> prototype, it works fine.  Can anyone explain this?
>
> function changeTab(chosen)
>       {
>       var x;
>       var tabs = new Array()
>       tabs[0] = "one"
>       tabs[1] = "two"
>       tabs[2] = "three"
>       tabs[3] = "four"
>       tabs[5] = "five"
>         for (x in tabs)
>            {
>             target = document.getElementById(tabs[x]);
>
>              if (tabs[x] !== chosen)
>                 {
>                     target.style.backgroundColor =
''#E7F1F8'';
>                 }
>              else if (tabs[x] == chosen)
>                 {
>           target.style.backgroundColor = ''white'';
>                  }
>       }

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Matt

2007-Jul-10 16:26 UTC

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Re: Prototype Doesn''t Play Well With Others?

When i was looking over your code it looks as though you''re comparing
a literal value where you may be looking for a property of the
document element.
>> if (tabs[x] !== chosen)
chosen is a variable, tabs is an array of string values, how is this
intended to work?

Perhaps you were looking for a conditional more like

if(target.chosen)
     target.style.backGroundColor= "white"

Cheers,
       Matt



On Jul 9, 10:26 am,
"parry.l...-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org"
<parry.l...-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
wrote:> Hey there,
>
> Looking at the error it seems that document.getElement.byId()
isn''t
> working, but why aren''t you using the $() helper?, not sure if
that
> causes conflicts. This may be happening because ever the elements
> don''t exist, named wrong,
>
> however you aren''t actually using anything from prototype js, and
I
> would sincerly recommend you look at the api docs.
>
> Mr Parry.
>
> On Jul 8, 1:03 pm, Judson
<judsonmitch...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> > When I call the script below with prototype.js included in the page, I
> > get a "target has no properties" error message.  If I take
out
> > prototype, it works fine.  Can anyone explain this?
>
> > function changeTab(chosen)
> >       {
> >       var x;
> >       var tabs = new Array()
> >       tabs[0] = "one"
> >       tabs[1] = "two"
> >       tabs[2] = "three"
> >       tabs[3] = "four"
> >       tabs[5] = "five"
> >         for (x in tabs)
> >            {
> >             target = document.getElementById(tabs[x]);
>
> >              if (tabs[x] !== chosen)
> >                 {
> >                     target.style.backgroundColor =
''#E7F1F8'';
> >                 }
> >              else if (tabs[x] == chosen)
> >                 {
> >           target.style.backgroundColor = ''white'';
> >                  }
> >       }

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Rails spinoffs - Jul 2007 - Prototype Doesn't Play Well With Others?

Prototype Doesn''t Play Well With Others?

Re: Prototype Doesn''t Play Well With Others?

Re: Prototype Doesn''t Play Well With Others?

Re: Prototype Doesn''t Play Well With Others?

Re: Prototype Doesn''t Play Well With Others?

Re: Prototype Doesn''t Play Well With Others?