OBJECT Get subform container value
OBJECT Get subform container value : Mixed
| Parameter | Type | Description | |
|---|---|---|---|
| Function result | Mixed | ← | Current value of the subform container data source |
This command is not thread-safe, it cannot be used in preemptive code.
Description
The OBJECT Get subform container value command returns the current value of the data source bound with the subform container displayed in the parent form.
This command can only be used in the context of a form used as a subform. In any other context, it returns Undefined.
- If the data source is an expression, the command returns the current value of the expression, evaluated since the last form event cycle.
- If the data source is an array, the command returns the array index (integer).
For more information on bound variables and form/subform interaction, see Managing the bound variable on developer.4d.com.
Example
Given a main form and a subform that both have an Input form object:
Inside the main form, the Input object and the Subform object are bound to the Form.numeric expression of type Numeric.
The main form's Input object and the subform's Input object both have the On Data Change property set via the Property list.
The subform's Form Method contains the following code:
If(Form event code=On bound variable change)
Form.displayNumeric:=OBJECT Get subform container value
End if
And inside the subform, the Input text's object method contains the following code:
OBJECT SET SUBFORM CONTAINER VALUE(Form.displayNumeric)
As a result, at runtime, updating the value of the main form's Input object also updates the value of the subform's Input object, and vice versa.