用RJS写的检测用户名和email是否存在

1， Client的check url

<%=link_to_remote 'Check Availability',
  :submit   => "signupForm",
  :url => {:controller => 'users', :action => 'check_avaiable' },
  :html => {:class => 'smallText'} %>

2, Controller的action

def check_avaiable
  respond_to do |format|
    format.html { redirect_to '/' }
    format.js
  end
end

3, RJS 文件

exist_user  = User.find_by_username(params[:username])

if exist_user.nil? then
  page.replace_html :check_username, :partial => 'check_avaiable', :locals=>{:check_value => params[:username]}
else
  page.replace_html :check_username, :partial => 'check_not_avaiable', :locals=>{:check_value => params[:username]}
end

exist_email = User.find_by_email(params[:email])

if exist_email.nil? then
  page.replace_html :check_email, :partial => 'check_avaiable', :locals=>{:check_value => params[:email]}
else
  page.replace_html :check_email, :partial => 'check_not_avaiable', :locals=>{:check_value => params[:email]}
end