JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" />

JavaScript

var isCtrl = false;
$(document).keyup(function (e) {
 if(e.which == 17) isCtrl=false;
}).keydown(function (e) {
    if(e.which == 17) isCtrl=true;
    if(e.which == 83 && isCtrl == true) {
        alert('you pressed ctrl+s');
    return false;
 }
});