Hidden Form with Javascript

To get my Javascript into a regular form I would type:
<input type="hidden" name="longitude" id="getlon" />
​
If using the "Hidden Field" in Chronoform, what would I type in "Value" to get id="getlon" in to the hidden field for the form?

I do not understand your question, the hidden field in Chronoforms has a value setting which you can use to set the field value, is this what you need ?