How to do calculation in Mendix

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 i want to know 1,how to use drop-down in mendix ..  2, how to get values from data-grid and use for manipulation and to store them in table.  
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2 answers
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For question one see documentation here: https://docs.mendix.com/refguide/drop_down

For the second question I advise you to follow the starting course you can find here: https://gettingstarted.mendixcloud.com/index3.html

Regards,

Ronald

 

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I think you'll need to be more specific:

1. Drop down is typically used for either an enumeration value or a reference selector. Enumeration being an attribute sourced by an enumeration list and a reference selector being a value from an associated entity. This would be the 1 of the 1 to many association.

 

2. Typically values in a datagrid are already stored in a table. What are you trying to achieve specifically?

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