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Problem in Multiple Select of drop down

mahadevan raja
Ranch Hand

Joined: Apr 11, 2001
Posts: 96
hi all,
i have a multiple select drop down
which has the following values
1.All (Users)
2.User1
3.User2
4.User3
now what i want to do is when i select "All" then the other values i.e
a.User1,User2,User3,should automatically get selected.
b.If i select All and then any other User then i should show the user that u have selected All already,so cant select other users
Plz reply soon,me in trouble.
Thanx in Advance.


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Anonymous
Ranch Hand

Joined: Nov 22, 2008
Posts: 18944
For the record, there is no HTML multi-select drop-down. There is only the multi-select list box. If you are getting the "drop-down" functionality in a select, then it isn't multi-select.
As for the "All" option, you will have to put an onChange() event handler in your <SELECT> tag. This event will be fired when the user selects/deselects an option in your list box. From there you will have to write some logic to determine if "All" has been selected or if it was already selected. If it was chosen then you can force the selection of all the available options. If it was already selected and the user chooses something else, you can then return false from your function, cancelling the change event.
Vijay S. Rathore
Ranch Hand

Joined: Oct 29, 2001
Posts: 449
Check and customize this as per your needs
http://www.geocities.com/rathorev/TestDrop.html


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mahadevan raja
Ranch Hand

Joined: Apr 11, 2001
Posts: 96
thanx vijay rathore,
the link u gave me was very useful,thanx a lot again,u solved my problem.
 
It is sorta covered in the JavaRanch Style Guide.
 
subject: Problem in Multiple Select of drop down