List Box

[enak]

I need to be able to move (or copy) data from one list box to another when
a button is clicked.

I am having a problem with the recognition of the Options object. Here is
the code below:

<script>

function fromPartiesToPlaintiff()
{

var index = document.frmRelatedParties.selParties.selectedIndex;
var text = document.frmRelatedParties.selParties.options[index].text;
var value = document.frmRelatedParties.selParties.options[index].value;
var len = document.frmRelatedParties.selPlaintiff.length;

var new_element= document.createElement(&quot;option&quot;
new_element.text = text;
new_element.value = value;
new_element.selected=true;
document.frmRelatedParties.selPlaintiff.options[len]=new_element;

}

</script>

<form name=frmPlaintiff>
<input type=button name=addPlaintiff value=&quot;Add Plaintiff --->>>&quot; onClick=&quot;fromPartiesToPlaintiff()&quot;>
</form>

I get an error in the function when this line is reached:
document.frmRelatedParties.selPlaintiff.options[len]=new_element;

Any ideas????

TIA
Nate

 

[wray]

As written, the problem line is trying to add an item to an array. In context, however, it should be trying to append an

option

element to an existing

select

element. Try --

document.frmRelatedParties.selPlaintiff.appendChild(new_element)

 

[enak]

That does not work. I get an error message of &quot;Object doesn't support this property or method&quot;

I have tried add(new_element) with the same results.

Thanks
Nate

 

[starway]

Use this:
var new_element = new Option();

instead of this:
var new_element= document.createElement(&quot;option&quot;

 

[wray]

What is

document.frmRelatedParties.selPlaintiff

? Context implies something like --

<select id=&quot;selPlaintiff&quot;>
  <option value=&quot;mad&quot;>Charles Manson</option>
  <option value=&quot;eccentric&quot;>Winona Ryder</option>
</select>

inside of

<form id=&quot;frmRelatedParties&quot;>

The form can also be

name

'd &quot;frmRelatedParties&quot;.