javascript - Yii - Retrieve Drop Down Value before form submit. -

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I have a web page with the menu drop down and many other stuff I want to retrieve the value of the dropdown menu , I know that $ _POST can be used after submission. But I want to get it before the presentation and so I want to use the javascript code. 

  document.getElementById (). Value;   
 I am confused about how to write this code in my form page.  
  $ form-> Dropdown list ($ model2, 'anonymous' CHtml :: listData (lists :: model () - & gt; search (), 'anonymous', 'anonymous'));   
 How do I call JavaScript in the form page?   
 
 
 dropdown id like  yourModelname_ename   
 of your dropdown Get the ID and use this code  
  var dom = document.getElementById ("idofyourdropdown"); Var results = dom option [DOM SelectedIndex]. Text; // Give selected text

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