Description
Occurs when the user clicks a button. This event occurs before the ButtonClicked event.
PowerBuilder event information
Event ID: pbm_dwnbuttonclicking
|
Argument |
Description |
|---|---|
|
row |
Long by value. The number of the row the user clicked. |
|
dwo |
DWObject by value. A reference to the control within the DataWindow under the pointer when the user clicked. |
Return Values
Set the return code to affect the outcome of the event:
0 -- Execute the action assigned to the button, then trigger the ButtonClicked event
1 -- Prevent the action assigned to button from executing and the ButtonClicked event from firing
For information on setting the return code in a particular environment, see About return values for DataWindow events.
Usage
Use the ButtonClicking event to execute code before the action assigned to the button occurs. If the return code is 0, the action assigned to the button is then executed and the ButtonClicked event is fired. If the return code is 1, the action and the ButtonClicked event are inhibited.
This event is fired only if you have not selected Suppress Event Processing for the button.
The Clicked event is fired before the ButtonClicking event.
Do not use a message box in the Clicked event
If you call the MessageBox function in the Clicked event, the action assigned to the button is executed, but the ButtonClicking and ButtonClicked events are not executed.
Returning the row number
When you place a button in the DataWindow and use the window's ButtonClicking event to return the row number, you will get different results depending on where you place the button. If the button is in the Detail band, it returns the number of the row. If the button is in the Header band, it returns the number of the first row displayed in the DataWindow control. If the button is in the Summary band, it returns the number of the final row in the list. If the button is in the Footer band, it returns the number of the last row displayed in the DataWindow control.
Examples
This statement in the ButtonClicking event displays a message box before proceeding with the action assigned to the button:
MessageBox(" ", "Are you sure you want to proceed?")See also
