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Returning a weeknumber from the standard calendar lookup form

A customer had a requirement for setting a week number for approximate delivery of purchased goods on shipment as an indication for the sales department of when the goods will be arriving.

An integer field had been introduced on the table in question, and the customer wanted to be able to do a lookup in the standard calendar, but wanted a week number to be returned in stead of a date.

I solved it like this:

1.
For the field that was to contain ETAWeek there was an Extended Data Type called ETAWeek.
On the EDT I put SysDateLookup in the FormHelp property

2.
In the Form SysDateLookup I added a boolean variable in Classdeclaration.

boolean calledFromIntegerField;

3. In the Form SysDateLookup - method init I added check to see if the SysDateLookup form was called from an integer form control.

if (formRun.selectedControl() is FormIntControl) 
    calledFromIntegerField = true;

4.In the Form SysDateLookup - method closeSelect I added an extra else if block in the bottom to handle returning the week number.
else if (calledFromIntegerField)
{
    super(num2str(weekOfYear(selectedValue),0,0,0,0);
}
Now the SysDateLookup works for the ETAWeek field.
UI design wise you can set the "ButtonImage" property on the Extended Data Type ETAWeek mentioned above to the value Calendar to get an calendar icon beside the field.



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