second attempt to add and remove using dropdown and listboxes

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Please see http://forums.asp.net/p/983898/1264650.aspx#1264650
There is a solution posted at Apr 21, 2006 07:15 PM
I'd like to use this code except that listbox1 needs to be a dropdown box. How do I adapt the code?
To get the code working change
var optionsList = ';
to
var optionsList = '';

Posted 22-Jan-14 2:00am

Alhal

Updated 22-Jan-14 2:05am

v2

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Christian Graus · Answer 1 · 2014-01-22T10:54:00

Solution 1

Please post your question here, if you want to be answered here. Either ask there for more help, or explain here what you've done and where you're stuck, without sending us to another forum.

Posted 22-Jan-14 10:54am

Christian Graus

Comments

Alhal 23-Jan-14 11:37am

This function is OK. However when I pass the name of the listbox to this function it stops working.
For example it will say listBox2.options.length is not recognised.

function ListBox2_onchange()
{
var DropDownList1 = document.getElementById('DropDownList1');
var listBox2 = document.getElementById('ListBox2');

for (var i=0; i<listBox2.options.length; i++)
{
if ( listBox2.options[i].selected )
{
var newOption = window.document.createElement('OPTION');
newOption.text = listBox2.options[i].text;
newOption.value = listBox2.options[i].value;

DropDownList1.options.add(newOption);
listBox2.options.remove(i);
}
}

persistOptionsList();
}

Christian Graus 23-Jan-14 16:23pm

cmbfiletypecode.options is null. So you need to set a break point in Chrome and work out why that is, and fix your code.