Dropdown dependent on another dropdown

[Fouad Mokhtar]

Hi,

I need to create two dropdown field and to be dependent to the each other..

Example

Dropdown list #1 has value of cities

Cairo
Alex

And dropdown list #2 has value of area

Nasrcity (belong to cairo)
Somoha (belomg to alex)

I need when user select Cairo in source field (#1) it only show areas related to the selection in the target field (#2)...etc

is there any module to do that or how I can achieve that please.

Thanks

[Ress]

You can use jQuery for this.
Specifically, you can use the "change" event for the first dropdown to populate the other input.
https://www.w3schools.com/jquery/event_change.asp

Now it also depends on where you have the data for the values in the second input. Do you load it from the database?
https://www.tutorialspoint.com/how-to-populate-select-list-with-jquery

[ps8modules.com]

First of all, you have to have the data stored somewhere.
You can have them either in CSV or XML or JSON or in a database.
Then it's easy to program.
If you don't give us the exact data, we can only speculate.

Edited July 22, 2022 by 4you.software (see edit history)