Type event

functions.js

// delay on typing
function delay(callback, ms) {
  let timer = 0;
  return function() {
    let context = this, args = arguments;
    clearTimeout(timer);
    timer = setTimeout(function () {
      callback.apply(context, args);
    }, ms || 0);
  };
}

index.js

const TYPING_TIMER_LENGTH = 700;
const $inputSearch = $('#inputSearch');

$inputSearch.keyup(delay(function (e) {
  let val = this.value;

  // doSimething
  // #

}, TYPING_TIMER_LENGTH));