Web Form Formula

There is a option in edit form options - Web Form Formula.

This can be used to update a user's custom field value by a constant or answer of current web form (it is highly recommended that users enable the tracking changes option of the custom field).

Example :

@#18230#@=@#18230#@+15

Add 15 to customfield(18230) whenever the user fills current web form.

@#18231#@='@form.cellphone@'

update customfield 18231 with a question, and variable name "cellphone" (variable name must be assigned to a question).

if question type is a combo box like "1=Yes;2=No"

@form.variable.text@ will be replaced with Yes or NO

@form.variable@ or @form.variable.value@ will be replaced with 1 or 2