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Message-ID: <2529079.e95EOKG17B@PointedEars.de>
From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To: Thomas 'PointedEars' Lahn <usenet@PointedEars.de>
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Date: Wed, 26 Jun 2013 02:34:30 +0200
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Subject: Re: How can javascript detect a fieldset in an array of elements
Newsgroups: comp.lang.javascript
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Xref: csiph.com comp.lang.javascript:20447

bugbuster wrote:

> I have a javascipt function which I use to erase all the field in a
> <FORM>. On those forms where yhere is a <fieldset> tag the script
> encounters a problem.
> 
> my laptop is a win 7 laptop and I use the IE browser.

IE 9 or 10?
 
> Here is my javascript function

There is no javascript: <http://PointedEars.de/es-matrix>

> function clearForm(oForm)
> {
> var elements = oForm.elements;
> var count = elements.length;
> 
> //	oForm.reset();
> 
> for ( i = 0 ; i < elements.length ; i++ )

You should declare those identifiers variables, and avoid repeated property 
access.  It is safer, and a lot faster:

  for (var i = 0, len = elements.length; i < len; ++i)

> {
> 
> field_type = elements[i].type.toLowerCase();

    var field_type = elements[i].type.toLowerCase();

> switch(field_type)
> {
> case "text":
> case "password":
> case "textarea":
> case "hidden":
> elements[i].value = "";
> break;
> 
> case "radio":
> case "checkbox":
> if ( elements[i].checked ) {
> elements[i].checked = false;
> }
> break;
> 
> case "select-one":
> case "select-multiple":
> elements[i].selectedIndex = -1;
> break;
> 
> default:
> break;
> } // SWITCH
>     } // FOR
> }
> 
> When i use this function on a FORM that has a fieldset then the line
> 
> field_type = elements[i].type.toLowerCase();
> 
> 
> errors out. IE reports that "type" is undefined/has no value.
> 
> How can I modify the function to overcome this issue ?

The reason of the error is most likely not that there is a “fieldset” 
element, but that there are several controls that have the same name.  For 
example, it is common to put a radiobutton group into a “fieldset” element.  
All radiobuttons of a group must have the same name to be dependent on one 
another.

In that case,

  elements[i]

refers to a NodeList of references to those controls.  An object 
implementing the NodeList interface does not have a “type” property.
As the property does not exist, accessing it results in “undefined”,
and “undefined” has no properties.

You can use the fact above to your advantage to find out whether there is a 
group of same-named controls that need to be processed differently:

  var control = elements[i];
  if (typeof control.type == "undefined")
  {
    /* iterate over NodeList */
    for (var j = 0, len2 = control.length; j < len2; ++j)
    {
      // …
    }

    // …
  }


Please post using your real name next time.

-- 
PointedEars

Twitter: @PointedEars2
Please do not Cc: me. / Bitte keine Kopien per E-Mail.