12/22/2016 - 7:20 PM

Lazy Loading Scripts -

To accomplish this simple lazy load technique, let’s first define a function that we’ll call loadScript:

function loadScript(url) {
  let isLoaded = document.querySelectorAll('.search-script');
  if(isLoaded.length > 0) {

  let myScript = document.createElement("script");
  myScript.src = url;
  myScript.className = 'search-script';

The function first checks if the script has already been loaded, in which case it’ll just return instead of trying to load it multiple times. We then create a script element with document.createElement, give it the passed-in url as the value to it’s src attribute, give it the class name for our check to work, and then append this new script element to the body element.

The last step is to simply setup an event listener on the search input and call our loadScript function with the url to our script:

var searchInput = document.querySelector('.algolia__input');
searchInput.addEventListener('focus', function(e) {

Obviously this mean that in theory there’s a short delay between focusing in the search box and the script being available to use. In most cases it shouldn’t be a problem, and in this case the real time search picks up as soon as the script is fully loaded.