jQuery event.which get event parameter
<!DOCTYPE html> <html> <head> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"> </script>/*w w w . j a va 2s . c om*/ <script> $(document).ready(function(){ $("div").mousedown(function(event){ $("div").append("<br>Mouse button pressed: " + event.which); }); }); </script> </head> <body> <div style="border:1px solid black;width:400px;height:400px;"> Press down any mouse buttons inside this div element.</div> </body> </html>