FIX: Multi-Select List Box Does Not Retain Selected Items

The information in this article applies to:

• Microsoft Visual FoxPro for Windows, versions 3.0, 3.0b

SYMPTOMS

A List Box that has the Multi-Select property set to True does not always retain the selected items.

WORKAROUND

Listed below are two workarounds:

• Create a mover-type list box to move the items from one list to another.

  -or-

• Populate the list box using the AddItem method, and set the RowSourceType to None, instead of basing the list box on fields.

   ARTICLE-ID: Q136588
   TITLE     : PRB: List Boxes and Combo Boxes Lose Item Properties

Steps Populate the List Box Using AddItem Method

The following steps can be used to fix the sample listed later in this article, under the "Steps to Reproduce Problem" section, assuming that the customer table from Testdata.dbc has first been added to the data environment.

1. Change the following properties of the list box:

         RowSourceType=none - 1
         RowSource=(empty)
   

2. Place the following in the Init Method of the list box:

         SCAN
         THIS.ADDITEM(cust_id, RECNO(), 1)
         THIS.LIST(RECNO(), 2)=address
         ENDSCAN
   

3. In the RightClick Method of the list box add the following:

         FOR i= 1 to THIS.LISTCOUNT
           IF THIS.SELECTED(i)
           ? THIS.LIST(i)
           ENDIF
         ENDFOR
   
   

STATUS

Microsoft has confirmed this to be a problem in the Microsoft products listed at the beginning of this article. This problem has been fixed in Visual FoxPro 5.0 for Windows.

MORE INFORMATION

Steps to Reproduce Problem

1. Create a form, and place a list box on it.

2. Set the list box properties as follows:

   ColumnCount = 2 ColumnWidths=50,200 Multi-Select = .T. RowSource=customer.customer_id,address RowSourceType=6-Fields

3. Run the form, and select the first item. Hold down the SHIFT key, and use the elevator bar to go to the bottom of the list and select the last item.

4. Scroll from the bottom of the list to the top to verify that all of the items are still selected. You will see that some of the items are no longer selected. The items that are no longer selected are not always the same items; they may vary from trial to trial.