title: prevent Duplicate values using Jquery Validation
body: <p>I have form and form text field which generates dynamically using JSP.
  And I'm using Jquery validation but want to add functionlaty to prevent duplicate entry in the form.</p>
  
  <p>E.g.</p>
  
  <pre><code>&lt;form name="myForm" id="myForm"&gt;
        &lt;input type="text" name="text1" id="text1"&gt;
        &lt;input type="text" name="text2" id="text2"&gt;
        &lt;input type="text" name="text3" id="text3"&gt;
        =
        = 
        N number of form fields
        &lt;input type="text" name="textn" id="textn"&gt;
  
  &lt;/form&gt;
  </code></pre>
  
  <p>I want to check if there is any duplicate value entered in the textfield using jQuery validation.</p>