Help needed on Select Form

Rails
1

Dear all,

I am pretty new to ruby on rails and I am supposed to create a form with
a few drop down options. The first drop down option will affect the
result in the data appearing in the drop down option for the second
field. E.g. If user select mobile phone as their device, the next drop
down will show the different OS of the phone such as Android, Symbian
etc… and not OS of a computer.

Hope to receive replies/help on this.

Many Thanks in advance.

2

Deb Liew wrote:

Dear all,

I am pretty new to ruby on rails and I am supposed to create a form with
a few drop down options. The first drop down option will affect the
result in the data appearing in the drop down option for the second
field. E.g. If user select mobile phone as their device, the next drop
down will show the different OS of the phone such as Android, Symbian
etc… and not OS of a computer.

Hope to receive replies/help on this.

Many Thanks in advance.

Hi,

You can use OnChange on the First select Box and call a remote function
like
<%= collection_select :device, :id, @devices, :id , :name, {},
{:onchange => remote_function( :update => “operating_system”, :url => {
:controller => “devices”, :action => “get_os”}, :position => “replace”,
:with => “‘device_id=’+this.value”) } %>
And have an element say div with id=“operating_systems”

In devices controller,action get_os
Find out @os (params[:device_id] will give you the device’s id from
which i suppose you can get the list of OS for the device)

Have a partial called _get_os.html.erb which will have the select box
for the OS
<%= collection_select :os, :id, @os, :id , :name %>

This is one of the many ways you can implement this functioanlity.Hope
You find this useful.

3

Hi,

Thank you for your reply.

Can I assume the method you stated is used when the values are inside
the database? Or does it work the same if it is not?

Thanks, once again.

Charanya N. wrote:

Deb Liew wrote:

Dear all,

I am pretty new to ruby on rails and I am supposed to create a form with
a few drop down options. The first drop down option will affect the
result in the data appearing in the drop down option for the second
field. E.g. If user select mobile phone as their device, the next drop
down will show the different OS of the phone such as Android, Symbian
etc… and not OS of a computer.

Hope to receive replies/help on this.

Many Thanks in advance.

Hi,

You can use OnChange on the First select Box and call a remote function
like
<%= collection_select :device, :id, @devices, :id , :name, {},
{:onchange => remote_function( :update => “operating_system”, :url => {
:controller => “devices”, :action => “get_os”}, :position => “replace”,
:with => “‘device_id=’+this.value”) } %>
And have an element say div with id=“operating_systems”

In devices controller,action get_os
Find out @os (params[:device_id] will give you the device’s id from
which i suppose you can get the list of OS for the device)

Have a partial called _get_os.html.erb which will have the select box
for the OS
<%= collection_select :os, :id, @os, :id , :name %>

This is one of the many ways you can implement this functioanlity.Hope
You find this useful.

4

Hi,

According to my consideration,
You will need the databases to be filled.I assumed that You have a table
called OS and Device.And Os and device tables are associated to each
other like OS belongs to Device
That is how from the device’s id we can get the list of OS for that
device in @os in the controller.

Regards,
Charanya N.

Deb Liew wrote:

Hi,

Thank you for your reply.

Can I assume the method you stated is used when the values are inside
the database? Or does it work the same if it is not?

Thanks, once again.

Charanya N. wrote:

Deb Liew wrote:

Dear all,

I am pretty new to ruby on rails and I am supposed to create a form with
a few drop down options. The first drop down option will affect the
result in the data appearing in the drop down option for the second
field. E.g. If user select mobile phone as their device, the next drop
down will show the different OS of the phone such as Android, Symbian
etc… and not OS of a computer.

Hope to receive replies/help on this.

Many Thanks in advance.

Hi,

You can use OnChange on the First select Box and call a remote function
like
<%= collection_select :device, :id, @devices, :id , :name, {},
{:onchange => remote_function( :update => “operating_system”, :url => {
:controller => “devices”, :action => “get_os”}, :position => “replace”,
:with => “‘device_id=’+this.value”) } %>
And have an element say div with id=“operating_systems”

In devices controller,action get_os
Find out @os (params[:device_id] will give you the device’s id from
which i suppose you can get the list of OS for the device)

Have a partial called _get_os.html.erb which will have the select box
for the OS
<%= collection_select :os, :id, @os, :id , :name %>

This is one of the many ways you can implement this functioanlity.Hope
You find this useful.