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Javascript form object name from string

I'm having trouble trying to access textfield through javascript by using a string of it name to reference the object. For example

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  1.  function toggle(num){ 
  2. document.form.paragraph_1.readOnly=!document.form.paragraph_1.readOnly;
  3. }
  4.  
When clicking on a link which calls this function, it will toggle a paragraph's readOnly ability. However I'm hardcoding in paragraph_1 as the name of the textfield. I want to be able to pass the id of the paragraph in the num parameter and toggle its related paragraph.

ie.
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  1. document.form."paragraph_"+num.readOnly=!document.form."paragraph_"+num.readOnly;
where I'm contructing the name from the string
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  1. "paragraph_"+num;
I cannot cycle through the elements[] array because I'm using AJAX to dyamically reorded the paragraph text fields, so I believe that would mess with the order of the elements. I think I am limitted to retrieving the object by its name.

Any suggestion?

Greatly appreciate it.
Apr 23 '06 #1
2 3605
Banfa
9,065 Expert Mod 8TB
Try

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  1. function ChangeReadOnly(id)
  2. {
  3.   var elem = document.getElementById(id);
  4.  
  5.   if (elem != NULL)
  6.   {
  7.     elem.readOnly = !elem.readOnly;
  8.   }
  9. }
  10.  
Apr 24 '06 #2
I was having this problem also.

Here is the solution:

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  1. document.form["paragraph_"+num].readOnly 
Reference the the form array using the form object name string representation for the index.

Cheers!
Oct 25 '06 #3

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