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jQueryUI Event Management on Dialog Box

<!doctype html>
<html lang = "en">
   <head>
      <meta charset = "utf-8">
      <title>jQuery UI Dialog functionality</title>
      <link href = "https://code.jquery.com/ui/1.10.4/themes/ui-lightness/jquery-ui.css"
         rel = "stylesheet">
      <script src = "https://code.jquery.com/jquery-1.10.2.js"></script>
      <script src = "https://code.jquery.com/ui/1.10.4/jquery-ui.js"></script>
      
      <!-- CSS -->
      <style>
         .ui-widget-header,.ui-state-default, ui-button {
            background:#b9cd6d;
            border: 1px solid #b9cd6d;
            color: #FFFFFF;
            font-weight: bold;
         }
         .invalid { color: red; }
         textarea {
            display: inline-block;
            width: 100%;
            margin-bottom: 10px;
         }
      </style>
      
      <!-- Javascript -->
      <script type = "text/javascript">
         $(function() {
            $( "#dialog-6" ).dialog({
	       autoOpen: false, 
               buttons: {
                  OK: function() {
                     $( this ).dialog( "close" );
                  }
               },
               beforeClose: function( event, ui ) {
                  if ( !$( "#terms" ).prop( "checked" ) ) {
                     event.preventDefault();
                     $( "[for = terms]" ).addClass( "invalid" );
                  }
               },
               width: 600
            });
            $( "#opener-5" ).click(function() {
               $( "#dialog-6" ).dialog( "open" );
            });
         });
      </script>
   </head>
   
   <body>
      <div id = "dialog-6">
         <p>You must accept these terms before continuing.</p>
         <textarea>This Agreement and the Request constitute the entire agreement of the 
         parties with respect to the subject matter of the Request. This Agreement shall be 
         governed by and construed in accordance with the laws of the State, without giving 
         effect to principles of conflicts of law.</textarea>
         <div>
            <label for = "terms">I accept the terms</label>
            <input type = "checkbox" id = "terms">
         </div>
      </div>
      <button id = "opener-5">Open Dialog</button>
   </body>
</html>

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