title: submit form does not stop in jquery ajax call
body: <p>I got following code :</p>
  
  <pre><code>$.ajax({
      type: "POST",
      async: false,              
      url: "CheckIdExist",
      data: param,
      success: function(result) {
          if (result == true){
              return false;
          }                                 
      },
      error: function(error) {
          alert(error);
          return false;
      }
  });
  </code></pre>
  
  <p>if ajax return value is true, form needs to stop submit.</p>
  
  <p>but it does not stopping submit form. </p>
  
  <p>any help please.</p>