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You have a dropdown, let's call it "selected_destination".
Under "events", you want On: change, Actions: reload, Identifier: code
I will assume you already correctly set up the read data actions in your load event to dynamically populate the dropdown (yes it is, I display destination).
[color=rgb(255, 0, 0)][mark]Options : = (line to get an empty line first)
{var:read_data19}

read_data19 : Return an array...
Model name : Liste
Fields to retrieve
code
destination[/mark][/color]

You have a text field, let's call it "code".
Under "advanced", you want Reload event: reload_code

You have a database table called xx_my_data, with three fields: id, name, flavour =>>> id, destination, code.

Under the "Setup" tab at the bottom of the page, create a new event called "reload_code".
in fact I was stucked here because with "New V6.1 mode" you add a Page, not an event. I have looked in old Form they are in "V6 classic mode" and have "add en event"
and it seems there is no way to change it throw front end, so I modified it in the sql table. Seems to work
You then want a Read Data action, with your table selected, and call the model "Destination".
* Where conditions: Destination.id:{data:selected_destination}
* Fields to retrieve: Destination.code [br]* Select type: first matching record[br]I have added a "Rule list" in Where conditions[br]Then you need a PHP action (under "Logic"). Replace "action_name" with the name of the read data action, the text in the black Name box. It should probably be "read_data20" or something along those lines.[br]$this->data("code", $this->get("read_data20.Destination.code", ""), true);[br][br]Lastly, you need a Custom code action, with:[br]{view:field_text58} where text_field_view_name is the Name: in the black label of the field.

in fact I was stucked here because with "New V6.1 mode" you add a Page, not an event. I have looked in old Form they are in "V6 classic mode" and have "add en event"and it seems there is no way to change it throw front end, so I modified it in the sql table. Seems to work

then you need a PHP action (under "Logic"). Replace "action_name" with the name of the read data action, the text in the black Name box. It should probably be "read_data20" or something along those lines.

This probably doesn't apply to your situation.