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<!DOCTYPE html> <html> <head> <script src="/lib/jquery-1.12.2.min.js"></script> <script> $(document).ready(function(){ $(".field").change(function(){ $(this).css("background-color", "#D6D6FF"); }); }); </script> </head> <body> <p>Attach a function to run when an element has been changed:</p> Enter your name: <input class="field" type="text"> <p>Write something in the input field, and then press enter or click outside the field.</p> Car: <select class="field" name="cars"> <option value="volvo">Volvo</option> <option value="saab">Saab</option> <option value="fiat">Fiat</option> <option value="audi">Audi</option> </select> <p>Select an option in the drop-down list.</p> </body> </html>