Here I am using one textarea and one button.The first textarea is used for user input then click the button and display the value in the alert box.
<html> <head> <script src="../../Scripts/jquery-1.4.1.min.js" type="text/javascript"></script> <script type="text/javascript"> $(document).ready(function () { $("button").click(function () { var dim = $("#txt").val(); alert(dim); }); }); </script> </head> <body> <div> <textarea id="txt" rows="5" cols="20"></textarea> <button type="button" id="btn">Click Here</button> </div> </body> </html>