Checks whether a field is present in the current screen. Use the optional iInd parameter to refer to the instance of a field in a subfile.

Syntax

CHECK_FIELD_EXISTS(sFieldName, [iInd]) 

Parameters

sFieldName

Required. A string that contains the name of the field to check.

iInd

Optional. Integer, must be greater than zero. For subfile fields this is the specific instance of the field.

Return Value

Boolean. Returns one of the following possible values:

true

The field was found in the current screen.

false

The field was not found in the current screen.

Remarks

For subfile fields you may choose not to pass iInd. When passed, iInd must be greater than zero or else it will return false.

Example

Check that that the field named PageMarker is present on this screen:

     if (CHECK_FIELD_EXISTS("PageMarker"))

Read every subfile entry on the page

     for ( Index = 1; CHECK_FIELD_EXISTS("ColGivename", Index);  Index++ )
     {
        var Givename = GETVALUE("ColGivename",Index);
        var Empno = GETVALUE("ColEmpno", Index);
        ...
     }