Field operators
In 4gl, there are operators which deal with the form fields and used to check the cursor position or trace the changes in form fields:
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tests whether any values were changed in a field or fields of the form. Returns TRUE after the data was displayed to the specified fields by the DISPLAY statement. |
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tests whether its operand is the identifier of the current field in the form |
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returns the contents of a field or fields in the current form |
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