How to fill select box with the names of the states corresponding to the country name selected in d

Rails
1

hi all ,

can any body guide me, i have to fill the dropdown box with the name
of the states of the country at run time which is dependent on the
name of the country you selected.

is their any helper exists for this.

thanks
sachin

2

Hi Sachin,

Something like this:

in your controller

@states = State.find_by_country(params[:country])

then in your view

<%= form.collection_select :state_id, @states, :id, :state %>

This example is based on form_for, so if you are using form_tag,
you’ll need the additional parameter at the beginning

<%= collection_select :person, :state_id, @states, :id, :state %>

Something like that anyway.

Peace,
Phillip

3

Oy. I just realized that I didn’t read the message closely enough.
I see now that you are needing to do one of two things:

  1. post the form when the country is selected, use the code I
    mentioned earlier (or something similiar) and render the form again, or
  2. use AJAX to query the database and repopulate the state select
    when the country changes.

I, personally, would go with #2. There is the argument that your app
should degrade gracefully if the user doesn’t have JavaScript
enabled, but I ignore that since my whole app depends on JavaScript
and I doubt that very many people actually have it disabled these
days. But that’s an architectural decision that I’ve made. Not
everyone would be comfortable with it.

I can provide an example of #2 if you like.

Sorry for the seeming incompetence on my part. I’ll try to read more
closely in the future.

Peace,
Phillip

Begin forwarded message:

4

please forward me the example if it is possible for you thanks

5

one more thing in your code what i realize is that i must have state
table in my database, which contains the name of the states for the
respective country or it is rails helper kind of thing

please confirm

thanks

6

Use render :inline to populate the values for the state dropdown.

Summarize:

  1. Post the AJAX request to the controller by using Observe_field
  2. Populate the state dropdown values using render :inline. You can
    write the logic in the controller action where you posted the AJAX
    requset.
7

[email protected] wrote:

one more thing in your code what i realize is that i must have state
table in my database, which contains the name of the states for the
respective country or it is rails helper kind of thing

please confirm

thanks

Probably, you can use observe_field to post the ajax request when
country is getting changed