A text-input field which will be automatically selected. An attached Barcode-Scanner will enter its output here, and go to the next page in case one is specified.
The selected function will trigger every time the value changes. If 'setState' is selected, it will store the new value in the value store.
A function other than 'setState' should not be selected here.
As this element usually stores its value and immediately proceeds to the next page, it can be made invisible, and designing this element can be neglected.