Article ID: 129571
Article Last Modified on 2/12/2000
APPLIES TO
- Microsoft Visual FoxPro 3.0 Standard Edition
This article was previously published under Q129571
SYMPTOMS
When a form set contains a Data Environment, the BeforeOpenTables event and the OpenTables method of the Data Environment are triggered before the Load event of the form set. This article explains the reason behind this implementation and offers a workaround if you want the Load event to execute before the tables are opened.
CAUSE
The Load event of a form set usually sets the environment of a form. In particular, it can be used to bind data to controls on a form. Therefore, in most cases, tables and views must be loaded before the LOAD event of a form set is executed. Thus, the OpenTables method of the data environment is, by default, called before the Load event of the form set is executed.
WORKAROUND
If you do not want the tables or views to be opened when the Load event of a form set is executed, set the AutoOpenTables property of the form to .F.. You can then call the OpenTables method of the data environment to open the tables automatically. For example, use the following command in any method of the form:
THISFORMSET.DataEnvironment.Opentables
STATUS
This behavior is by design.
MORE INFORMATION
Following is the sequence of events that are executed when a form set created in Visual FoxPro version 3.0 is loaded or unloaded. The order of events might differ if the form is converted from a FoxPro version 2.x screen. In this example, the form set is named FORMSET1 and contains a form named FORM1 and a data environment called DATAENVIRONMENT. This list was generated by executing the following code for the following events and methods:
ACTIVATE SCREEN
?PROGRAM()
FORMSET1.LOAD
.DATAENVIRONMENT.OPENTABLES
.DATAENVIRONMENT.BEFOREOPENTABLES
FORMSET1.FORM1.LOAD
FORMSET1.DATAENVIRONMENT.INIT
FORMSET1.FORM1.INIT
FORMSET1.INIT
FORMSET1.SHOW
FORMSET1.ACTIVATE
FORMSET1.FORM1.ACTIVATE
FORMSET1.FORM1.GOTFOCUS
FORMSET1.FORM1.QUERYUNLOAD
FORMSET1.DESTROY
FORMSET1.FORM1.DESTROY
FORMSET1.FORM1.UNLOAD
FORMSET1.UNLOAD
FORMSET1.DATAENVIRONMENT.CLOSETABLES
FORMSET1.DATAENVIRONMENT.AFTERCLOSETABLES
FORMSET1.DATAENVIRONMENT.DESTROY
NOTE: The OPENTABLES method calls the BEFOREPOPENTABLES event before the tables are actually opened. However, the code in the event handler is executed before the tables are opened, and this is the reason why OPENTABLES prints before BEFOREOPENTABLES prints.
For more information about the sequence of events that are triggered when a form runs, execute the sample program called EVENTS.SCX located in the SAMPLES\CONTROLS\EVENTS directory.
Additional query words: VFoxWin
Keywords: KB129571
