allow selecting only two items in multiple selection box?

rubyonrails-talk
1

Hi,

I'd like to use 'selection' with :multiple=>true but allow selecting only two items from the list. is there any easy way in RoR or I have to use some javascript testing with onChange event?

Thanks very much

2

If you want to give the user feedback immediately when he selects a second option, you need to use Javascript. It can on the other hand be generated by RoR using RJS (called by a remote_function), but it it probably easier just to put it directly in the onchange-handler as you suggested.

3

http://www.webtricks.com/sourcecode/source_code.cfm?CodeID=16

(3 seconds on google)