entity.indexOf( )

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4D v17.4

entity.indexOf( )

Description

The entity.indexOf( ) method returns the position of the entity in an entity selection.

By default if the entitySelection parameter is omitted, the method returns the entity's position within its own entity selection. Otherwise, it returns the position of the entity within the specified entitySelection.

The resulting value is included between 0 and the length of the entity selection -1.

If the entity does not have an entity selection or does not belong to entitySelection, the method returns -1.
If entitySelection is Null or does not belong to the same dataclass as the entity, an error is raised.

Example

 C_OBJECT($employees;$employee)

 $employees:=ds.Employee.query("lastName = :1";"H@") //This entity selection contains 3 entities

 $employee:=$employees[1] //This entity belongs to an entity selection

 ALERT("The index of the entity in its own entity selection is "+String($employee.indexOf())) //1

 

 C_OBJECT($employee)

 $employee:=ds.Employee.get(725) //This entity does not belong to an entity selection

 ALERT("The index of the entity is "+String($employee.indexOf())) // -1