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copied!<p>In the above code, you haven't included the jquery and jquery-ui libraries. For example, put the following in the <code><head></code> section of your page:</p> <pre><code><script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js" type="text/javascript"></script> <script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.18/jquery-ui.min.js" type="text/javascript"></script> </code></pre> <p>Also, you should add <code><head></code> and <code><body></code> tags around the appropriate content, so your page would look more like this:</p> <pre><code><html> <head> <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js" type="text/javascript"></script> <script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.18/jquery-ui.min.js" type="text/javascript"></script> <script type="text/javascript"> var count = 1; $(function(){ $('#add_item').click(function(){ count++; $('#container').append('<li id="item_' + count +'">' + count + '° posto: '+ '<input type="text" id="item_' + count + '" name="items[]" type="text" /><input type="submit" class="del_item" value="Elimina" /><br /></li>'); return false; }); $('form').on('click', '.del_item', function(){ count--; $(this).parent().remove(); return false; }); $('#container').sortable(); }); </script> </head> <body> <ul id="container"> <li id="item_1">1° posto: <input type="text" id="item_1" name="items[]" /> <input type="submit" class="del_item" value="Elimina" /><br /></li> </ul> <input type="submit" name="add_item" id="add_item" value="Aggiungi" /><br /> </body> </html> </code></pre>

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