Page triggers allow you to use C/AL code to control the behavior of the system as a result of an event on the page, such as a page opening or a field changing its value. You typically use page triggers for advanced validation and logic.
Page triggers can be divided into three categories:
General page triggers that apply to the entire page
Field page triggers that apply to a field control on a page
Action triggers that apply to an action on a page.
|If you define two functions that have the same name, one defined in a page and the other in a table that is referenced by the page, you cannot invoke the function defined in the page directly. By default, a call to the function invokes the function that is defined in the table. This behavior occurs when the function is called from a source expression or a trigger.|
The following table lists triggers that apply to the entire page.
|Page trigger name||Executed|
When the page is loaded, but before the controls are available.
When the page is initialized and the controls are available.
When the page about to close and after OnQueryClosePage Trigger trigger.
When the page is opened and a record is retrieved from a table.
When the page changes from displaying one record to another record in a table. For example, on a Customer card page, this happens when a user selects Next (Ctrl+Page Down) or Previous (Ctrl+Page Up).
After the current record is retrieved from the table.
When a record has been retrieved but not yet displayed.
When a new record has been initialized but not yet displayed.
When a new record is about to be inserted in the table.
When a record is about to be modified in the table.
When a record is about to be deleted from the table.
When the page is about to close, but before the OnClosePage Trigger.
The following table describes the triggers that are available on field controls.
When the user changes the value in a field and then selects away from the field so that the field loses focus.
When the user requests a lookup by clicking a field's lookup button or pressing F4.
When the user requests a drill-down by choosing the field's drill-down button or pressing Shift+F8.
When the user requests assist-edit by choosing an AssistEdit button or by pressing Shift+F4.
When a control add-in is initiated on a page.
The following table lists triggers that apply to actions on a page.
When an action is initiated on a page.