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Developer forum

Changing Property Value by Changing Property Option.

Benson Ogayo


I need some help. I'm trying to make an expression based property that changes it's value if I change a value from an option set property. I have an option set 'Unit' with options; (M2, M3, M, KG, Item) and another property 'Quantity'. I'd want when I change the "Unit" option to 'M2', for example, The "Quantity" value reads the Area of an element, and if I change to 'M3', the "Quantity" value reads the Volume of the element.



I'll appreciate your feedbacks. Kind regards.



I would use "IFS" statement and start working the expression around that. Also the data type of the expression I would keep as "string" because there are multiple different types of data that expression must be able to handle with one script. 


Here's the idea. First "Unit=xx" is a logical condition and second is the the retrieved value determined by the logical condition. Just add other unit types to end of the IFS-script with the  same way as m² and m³.  Also use STRCALCUNIT to handle retrieved values as a string.



In the picture above I also used "concat"-function to join measured value and unit of measurement (as a string) together but that function is not necessary if you don't want to show unit of measurement in the end of the calculated value.


Hope this helps!


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