topic Re: How to apply "Max Selected" to a check box list in Discussions

How to apply "Max Selected" to a check box list

ALopez — Fri, 09 Jun 2023 22:03:41 GMT

Hi, Is it possible to apply the "Max Selected" filter to limit the number of Check Boxes that a User can select?

I will appreciate your suggestions.

Names Default To Here( 1 );
New Window( "Example",
	cb = Check Box(
		{"One", "Two", "Three"}, Max Selected(2),
		Print(
			"Selected: " ||
			Concat Items( cb << Get Selected(), ", " )
		)
	)
);

Re: How to apply "Max Selected" to a check box list

txnelson — Tue, 19 Jan 2021 17:31:42 GMT

There is not a Max Selected message that can be set, however one can write a script to do it. Here is my way of handling it

Names Default To Here( 1 );
New Window( "Example",
	cb = Check Box(
		{"One", "Two", "Three"},
		curSelected = cb << get selected;
		If( N Items( curSelected ) > 2, 
			// Determine the one just selected
			For( i = 1, i <= N Items( cb << get items ), i++,
				If(
					Contains( curSelected, (cb << get items)[i] ) > 0 & 
						Contains( prevSelected, (cb << get items)[i] ) == 0,
						dialog("Too many selections");
						cb << set(i,0);
						Break();
				)
			);
		,
			prevSelected = curSelected;
		);
	)
);

Re: How to apply "Max Selected" to a check box list

ALopez — Tue, 19 Jan 2021 18:06:26 GMT

Thanks @txnelson, I was afraid that the answer was going to be: No. Very nice your work-around, I will try to implement it in my code.

Re: How to apply "Max Selected" to a check box list

txnelson — Tue, 19 Jan 2021 19:16:09 GMT

All you need to do for such items as your "Max Selected" message you suggested, is to go to the Scripting Index and look at the CheckBox entry. And if you don't see a message that will do what you are suggesting, then there isn't such a capability directly from the object