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• This is a method of the text box, which basically forces the cursor to be at the specified text box. onsubmit Unlike onblur, onsubmit handler is inserted inside the <form> tag, and not inside any one element.
• For example:
  
  <script>
  <!--
  function validate()
  {
  if(document.login.userName.value=="")
  {
  alert ("Please enter User Name")
  document.login.userName.focus()
  return false
  }
  if(document.login.password.value=="")
  {
  alert ("Please enter Password")
  document.login.password.focus()
  return false
  }
  }
  //-->
  </script>
  
  <form name="login" onsubmit="return validate()">
  Enter your name: <input name="userName" />
  
  Enter your Password: <input name="password" />
  
  <input name="submit" type="submit" /></form>