问题
I have a form created by Form Builder and I want to display the values of request headers in a label control, could I please know where to add xxf:get-request-header()? Is it on the initial value box of the control and are there configurations I need to make in the properties-local.xml file in order to make this work?
回答1:
You can use formulas, and more specifically a calculated value to set the value of a field, but at this point Form Builder doesn't support setting the label of a field using a formula.
If possible, I'd recommend you use a Calculated Value value field, and show the value somewhere else in the form.
来源：https://stackoverflow.com/questions/37063122/orbeon-http-headers