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<!DOCTYPE html> <html> <head> <script src="/lib/jquery-1.12.2.min.js"></script> <script> $(document).ready(function(){ $("button").click(function(){ $("input:text").val(function(n, c){ return c + " Griffin"; }); }); }); </script> </head> <body> <p>Name: <input type="text" name="user" value="Peter"></p> <button>Set the value of the input field</button> </body> </html>