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Hidden input elements are HTML controls in the form of 
<input type="hidden"></input>
They are not displayed in the form, but can be used to retrieve values to be used in the context of the form (e.g., using Angular bindings).

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Binding a Hidden Element to a Process Variable

A hidden input can be bound to a process variable using the cam-variable-type and cam-variable-name directives: 
<input type="hidden"
       cam-variable-name="CUSTOMER_ID"
       cam-variable-type="String"
       value="testuser" />
In the example above, the hidden input field is bound to the variable named CUSTOMER_ID of type String and contains the value testuser.

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Supported Variable Types for Hidden Elements

The hidden input field supports the same variable types as the single line text input <input type="text"></input>. See the section on Supported Variable Types for details.