Questions about selection-box

[Chaw]

Hi everyone，
Some days ago i raised a question about linkage,but there is no reply.
It was possible to feel puzzle by giving details about that issue.
Now please allow me to re-raise this question and I will describe the question clearly this time.
Question: How to build the relation between two selection-box?

e.g.: [Owner] and [End User]

Description:

First i create the two module ‘Owner’ and ‘End User’ like this.

In the Owner exist the datas like this:Company_A, Company_B,Company_C

And in the End User exist the datas like this:
Person_A_01,Person_A_02,Person_A_03,
Person_B_01,Person_B_02,Person_B_03,
Person_C_01,Person_C_02,Person_C_03,

To the selection-box，when i select one value in [Owner]，i wish to select the corresponding value，not all values in [End User].Such like this.

Whether it can be achieved through back-end code.
In Ralph source code there is no such example to refer to learning that.
If you have any ideas to help me,i will greatly appreciate.Thank you!

[marcin.kliks]

We do that through some javascript.

For example, when you’re adding new Data Center asset, and choose its Model, we populate “Deprecation rate” field with a default deprecation rate set in model configuration.

Here’s the code:

allegro/ralph/blob/ng/src/ralph/admin/templates/admin/includes/depreciation_rate.html

[Chaw]

Hello Marcin Kliks，

This problem has been solved.Thanks for your reply.
I used the JavaScript to do that as well.

Thanks again for your support.