Problem with javascript validation in rails

Rails
1

Hi all,

I have a form for adding new entries in my “dev” model.
I need to check empty fields in that using javascript function. but in
my
form im having combo box and other fields in rails code.

my query is : does javascript function identify rails code and validate
the
fields like it does for html?

my code is given below… but it doesnt work… please help me with this:

view:

Add Device

<%= "Fields marked with * are required" %>

Device Info
  1. Device Name : <%= text_field "dev", "name", :size => 20%> <%= "*" %>
Location Details
  1. Lab : <%= collection_select(:labt, :id, @labts, :id, :name,:prompt=>"Select a Lab") %><%="*"%>

javascript function:

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