topic Re: Update a List Box Based on a Combo Box Selection in Discussions

Update a List Box Based on a Combo Box Selection

Ksrzg01 — Wed, 04 Apr 2018 23:02:29 GMT

Hello all,

So I have a few lists, in this case fruit and vegetables, and based on my selection on the combo box I would like to populate the list box with the new list. For example, if I have "fruit" selected, I want the list box to display oranges, apples, and grapes. The script I have works, but it doesnt evaluate the list AND I also do not want it to keep appending the list box with my selection. Is there a way around this?

TestArray = {"Fruit", "Vegetables"}; //my list of 'stuff'
Fruit = {"Oranges", "Apples", "Grapes"};
Vegetables = {"Corn", "Squash", "Eggplants"};


nw = New Window( "Sample",
	<<Modal,
	vlb = H List Box(
		cb = Combo Box(
			TestArray,
			tb2 << Append(cb << Get Selected);
		),
		tb2 = List Box()
	)
);

Thanks!

Re: Update a List Box Based on a Combo Box Selection

uday_guntupalli — Wed, 04 Apr 2018 23:33:14 GMT

@Ksrzg01,

Try this. The list needs to be evaluated before its elements can be populated into the list box and a way to acheive it is as shown below.

TestArray = {"Fruit", "Vegetables"}; //my list of 'stuff'
Fruit = {"Oranges", "Apples", "Grapes"};
Vegetables = {"Corn", "Squash", "Eggplants"};
MyLists = {Fruit,Vegetables}; 

nw = New Window( "Sample",
	<<Modal,
	vlb = H List Box(
		cb = Combo Box(TestArray,
						MySelection = cb << Get Selected; 
						tb2 << Append(Eval(Parse(Eval Insert("\[^MySelection^]\"))));
					  ),
		tb2 = List Box()
	)
);

Re: Update a List Box Based on a Combo Box Selection

txnelson — Wed, 04 Apr 2018 23:34:35 GMT

The main issue is that what is returned from the

cb << Get Selected

is not a variable name, as you were wanting it to be, but rather a string, "Fruit" or "Vegetables". That is, the names of the 2 list are Fruit and Vegetables, not "Fruit" and "Vegetables".

Below is a script that works the way you want. There are other ways to do this, that others may want to contribute

Names Default To Here( 1 );
TestArray = {"Fruit", "Vegetables"}; //my list of 'stuff'
Fruit = {"Oranges", "Apples", "Grapes"};
Vegetables = {"Corn", "Squash", "Eggplants"};


nw = New Window( "Sample",
	<<modal,
	vlb = H List Box(
		cb = Combo Box(
			TestArray,
			tb2 << remove all;
			If( (cb << Get Selected) == "Fruit",
				tb2 << Append( Fruit ),
				tb2 << Append( Vegetables )
			);
		),
		tb2 = List Box()
	)
);

Re: Update a List Box Based on a Combo Box Selection

Ksrzg01 — Thu, 05 Apr 2018 16:55:01 GMT

Thanks Nelson! One last question, when I do tb2 << Get Selection, I get an output in {"Apples"} format, any way to convert to just "Apples"? Substr and Word function are not working.

Re: Update a List Box Based on a Combo Box Selection

txnelson — Thu, 05 Apr 2018 17:03:32 GMT

1. What has been returned is a List. To get the specific value from a list, all you have to do is to ask for the specific element from the list. In your case, there is only one element being returned, so you just have to specify

(tb2 << Get Selection)[1]

2. Your venture into JSL will remain a mistery until you spend the time reading the Scripting Guide. It describes not just the syntax, but even more impotantly, the language structures( Lists, Matrices, etc. ).

Help==>Books==>Scripting Guide