Populate a field with a value depending on dropdown selected

I have created a dropdown in my Gravity Form and I have also created a seperate hidden field.

If the user selects option One from the dropdown I would like a value e.g “10001” to be placed in the hidden field and if option two is selected I would like the value “10009” to be placed in the hidden field.

Does anyone know if this is possible without buying another add-on. If so, can someone point me in the right direction?

Hi Jason. Without buying another add-on, you would have to do this with some JavaScript or jQuery, to write the value to the hidden field after a selection is made.

The paid plugin route is to use Gravity Wiz Populate Anything, and their live merge tag feature:

Live Merge Tags.
Add auto-updating merge tags anywhere inside your form (e.g. labels, descriptions, choices, values, HTML content).

Give an ID “selectBox” to selectbox And “textField” to the text box. By using Jquery then you can populate its value.

$(document).on('change', 'select#selectBox', function(){

Also make small change in your loop, add quotes " " to value.

@foreach ($payments as $p)
      <option value ="{{$p->item}}">{{$p->item}}</option>