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professional-javascript-11-BlockCharsExample.htm / htm

          <title>Block Characters Example</title>
          <script type="text/javascript" src="detect.js"></script>
          <script type="text/javascript" src="eventutil.js"></script>
          <script type="text/javascript" src="textutil.js"></script>
          <p>Try typing in the textbox. You can only type non-number characters.</p>
          <form method="post" action="javascript:alert('Submitted')">
              <textarea rows="10" cols="25" invalidchars="0123456789" onkeypress="return TextUtil.blockChars(this, event)"></textarea>
              <input type="submit" value="Submit Form" />

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