Microsoft KB Archive/109582

{| = Alternative to Changing Table Under POPUP...PROMPT FIELD =
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ID: Q109582

The information in this article applies to:


 * Microsoft FoxPro for Windows, versions 2.5, 2.5a, and 2.5b
 * Microsoft FoxPro for MS-DOS, versions 2.5, 2.5a or 2.5b
 * Microsoft FoxPro for Macintosh, version 2.5b

SUMMARY
When a popup is defined with the PROMPT FIELD clause, closing the database file on which the popup is based when the popup is still in memory can cause problems.

MORE INFORMATION
In a program, it is possible to close and delete the database on which a POPUP ... PROMPT FIELDS command is based and then substitute another database in place of the original. The new database can have a different structure, a different number of records, and so on. However, FoxPro is not designed to allow for the deletion and substitution of databases underneath active or defined popups. This practice is not supported and should not be used.

The following program demonstrates a method by which the table that underlies a POPUP ... PROMPT FIELD can be closed and re-created while the popup is in memory.

* When this program is executed, select an option on the * popup and press the ENTER key to call "PROCEDURE popper". * The F5 key should be used to deactivate the popup. * Press the F5 key at any time to deactivate the popup.

CLOSE ALL SET SAFETY OFF

ON KEY LABEL f5 DEACTIVATE POPUP test

CREATE TABLE test (city C(10)) INSERT INTO test (city) VALUES ("Seattle") INSERT INTO test (city) VALUES ("Boston")

DEFINE POPUP test FROM 02,02 PROMPT FIELD city ON SELECTION POPUP test DO popper ACTIVATE POPUP test RELEASE POPUP test

PROCEDURE popper

SELECT test

* At this point, the table is closed. A new table * is created. The active popup is based on a   * different table, and is unaware that these * changes are occurring. Although this type of   * code may appear to function properly, it is    * unsupported and subject to change in the future.

USE CREATE TABLE test (city C(10)) INSERT INTO test (city) VALUES ("Chicago") INSERT INTO test (city) VALUES ("New York")

RETURN If you need to display a new popup to list information from a different table, release the original popup with the RELEASE POPUP command. Then, create a new popup with the DEFINE POPUP command. Additional reference words: FoxMac FoxDos FoxWin 2.50 2.50a 2.50b KBCategory: kbenv kbprg kbcode KBSubcategory: FxenvMemory
 * }