How to determine whether the user has already selected an option from a multi select list

[Patrick Olurotimi Ige]

I would like to capture when a user has already selected an option from
a multi select list / or Textbox
So for example if a user selects a value 3 using a dropdown list or by
inputing a value it shouldn't be allowed to select 3 again only values 2
and 1.
using a rated 1 to 3 in order of preference)
*** Sent via Developersdex http://www.developersdex.com ***
Don't just participate in USENET...get rewarded for it!

[MasterGaurav]

No. You cannot disable selection of any specific items in Multi-Select
ListBox.

However, you can do a lengthy trick:

1. Add an onchange (client-side) event to the DDL
2. Whenever the value is changed, repopulate the Multi-Select ListBox
with all items except the one selected in DDL.

^^ This can also be done on server side -- use autopost back.

It's a little tricky and lengthy. I would suggest you handle it on the
serverside by manipulating the selected value.
--
Cheers,
Gaurav Vaish
http://www.mastergaurav.org
http://mastergaurav.blogspot.com
--------------------------------

[Patrick Olurotimi Ige]

About doing this with Client Side scripting i.e Jscript?


*** Sent via Developersdex http://www.developersdex.com ***
Don't just participate in USENET...get rewarded for it!

[MasterGaurav]

JScript or Javascript?

In anycase, the whole idea is... the MultiSelect ListBox does not
support disabling of any one entry. This is not in HTML specifications.

So, it doesn't matter how you try, it will never happen.

--
Cheers,
Gaurav Vaish
http://www.mastergaurav.org
http://mastergaurav.blogspot.com
--------------------------------

[Patrick Olurotimi Ige]

Hi Gaurav,
But is it possible if it isn't MultiSelect?
It could be a dropdown list or even a textbox.

*** Sent via Developersdex http://www.developersdex.com ***
Don't just participate in USENET...get rewarded for it!

[MasterGaurav]

No. None of the multiple-items / list allow this.

--
Cheers,
Gaurav Vaish
http://www.mastergaurav.org
http://mastergaurav.blogspot.com
--------------------------------

[Niceman]

Why not use OnChange, if the user chooses the already selected alternative
there is no change...
/N

"Patrick Olurotimi Ige" wrote:

I would like to capture when a user has already selected an option from
a multi select list / or Textbox
So for example if a user selects a value 3 using a dropdown list or by
inputing a value it shouldn't be allowed to select 3 again only values 2
and 1.
using a rated 1 to 3 in order of preference)
*** Sent via Developersdex http://www.developersdex.com ***
Don't just participate in USENET...get rewarded for it!