title: I want to concatenate two text fields in html and display the result in other test field
body: <p>I have my code like this</p>
  
  <pre><code>First name : &lt;input type="text" name="txtFirstName" /&gt; &lt;br&gt;&lt;br&gt;
  Last name : &lt;input type="text" name="txtLastName" /&gt; &lt;br&gt;&lt;br&gt;
  Full name : &lt;input type="text" name="txtFullName"  &gt; &lt;br&gt;&lt;br&gt;
  </code></pre>
  
  <p>if i give abc in first name text box and def in last name text box the result should be displayed as abcdef in full name text box. How to do this?</p>