topic Re: ComboBox dropdown resizing issue with lengthy values in Discussions

ComboBox dropdown resizing issue with lengthy values

OddsDeer284888 — Sun, 23 Nov 2025 23:01:10 GMT

I’m running into an issue with the ComboBox in JMP. The dropdown width is automatically adjusted based on the longest value in the list. Since I’m loading data from a database, most values are short, but a few are very lengthy. When those long values are included, the entire dropdown becomes excessively wide.

I haven’t been able to find any documentation on how to control or fix the dropdown size. Is there a way to set a maximum width or otherwise prevent the ComboBox from expanding too much when one value is lengthy?


// Example ComboBox with mixed-length values
New Window( "ComboBox Size Issue",
    <<Background Color( "white" ),
    V List Box(
        Text Box( "Select an option:" ),
        Combo Box(
            {"Cat", "Dog", "Bird", "Elephant", 
             "ThisIsASingleVeryVeryVeryLongValueThatMakesTheDropdownTooWide aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaabbbbbbb"},
            <<Set Function( Function( {this}, 
                Show( this << Get Selected ) 
            ))
        )
    )
);

Re: ComboBox dropdown resizing issue with lengthy values

jthi — Mon, 24 Nov 2025 05:18:28 GMT

I'm not sure if you can force the max size of combo box so you would have to first shorten those values.

Re: ComboBox dropdown resizing issue with lengthy values

OddsDeer284888 — Mon, 24 Nov 2025 09:58:47 GMT

Truncating the data would be costly since the data is in the thousands.

Re: ComboBox dropdown resizing issue with lengthy values

jthi — Mon, 24 Nov 2025 10:02:21 GMT

Have you tried how costly it would be if you do it in JMP either with Transform Each() or with formula column/transform column only on unique values?

Re: ComboBox dropdown resizing issue with lengthy values

jthi — Tue, 25 Nov 2025 17:01:01 GMT

You can "force" Combo Box width at least with Lineup Ruler Box + Lineup Box

Names Default To Here(1);

nw = New Window("",
	Lineup Ruler Box(
		Widths({100}),
		Lineup Box(N Col(1),
			Combo Box({"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"})
		)
	)
);