How to trigger javascript on print event?

Question

Is it possible to trigger a javascript event when a user prints a page? I would like to remove a dependancy on a javascript library, when a user opts to print a page, as the

Answer 1

For anyone coming here looking for an option using Bootstrap as I was, I used the following code to achieve this when a print button is clicked. This won't work when they press CTRL + P.

$("#print_page").click(function(){
$("#print_section").addClass('visible-print-block');
window.print();
$("#print_section").removeClass('visible-print-block');})

You need to add hidden-print to anything you don't want printed and then add an ID (or a class if you have more than one section) of print_section to the bit you want printed! Bit hacky but it works!