javascript - Disable send button -

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I am using this code to check if the value is selected in the Open drop down. 

  $ (document) .ready (function () {$ ("send") Click (function () {if (document.getElementById ('dropdown1'). SelectedIndex == 0) $ ("# Msg_dropdown1") HTML ("required");}); $ ('# dropdown1') .changes (function () {$ ('# msg_dropdown1'). Hide ()})});   
 Is there a way to disable the SUBMIT button until a value is selected?  
  & lt; Input type = "submit" id = "send" value = "send" class = "gb btn" />    
 
 
 change  $ (click "send") (function () { Click  $ (# "send") from  (function () {

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