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<!DOCTYPE html> <html> <head> <script src="/lib/jquery-1.12.2.min.js"></script> <script> $(document).ready(function(){ $("input").change(function(){ alert("The text has been changed."); }); }); </script> </head> <body> <input type="text"> <p>Write something in the input field, and then press enter or click outside the field.</p> </body> </html>