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<!DOCTYPE html> <html> <head> <script src="/lib/jquery-1.12.2.min.js"></script> <script> $(document).ready(function(){ $("input").keydown(function(){ $("input").css("background-color", "lightblue"); }); $("input").keyup(function(){ $("input").css("background-color", "lavender"); }); $("#btn1").click(function(){ $("input").keydown(); }); $("#btn2").click(function(){ $("input").keyup(); }); }); </script> </head> <body> <input type="text"> <p><button id="btn1">Trigger keydown event for input field</button></p> <p><button id="btn2">Trigger keyup event for input field</button></p> </body> </html>