Multi-Select List Box

[Elena]

Hi, 

 

Is there a way to put a limit to the number of items that can be selected in a list box? 

I have a list box in an update form. It is not for search purposes, rather for adding values to a data base.

 

Any help or attention will be greatly appreciated. 

 

Best, 

Elena

 

[Jan]

Hi Elena,

 

I think, you can use the following script, if it works for you:

function check_listbox() {
var the_listbox = document.getElementById("EditRecordFIELDNAME");
var max_number = 3;
var checked = 0;
for (var i=0 ; i < the_listbox.options.length; i++ ) 
 {
   if (the_listbox.options[i].selected) {checked++;}
   if (checked > max_number)
   {
      alert("The maximum of choices is 3!");
      return false;
    }
  }
}
document.getElementById("caspioform").onsubmit = check_listbox;

Please, enter the name of your field instead of FIELDNAME; enter your maximum number and your message.

 

The script will not allow to save the record, if a user selects too many items.

 

I hope, it helps.