Store custom field value in Episerver Forms

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In Episerver Forms, you can write your own logic for handling the form submission. 

I'm wondering if this is also possible per element within the form. We would like to have a custom form field with multiple input lements (bound together by javascript and an external service) but the final value of the field will be constructed using all the values of those fields.

I have been looking into the GetValue(), SetValue() and GetSubmittedValue() methods, but they dont seem to store my custom value. 
How can this be achieved?

#171658
Nov 14, 2016 16:00
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