Thomas Portelange
LeKoala Dev Blog

LeKoala Dev Blog

Getting rid of jQuery

Getting rid of jQuery

With the upcoming arrival of Bootstrap 5 , more and more sites will be able to do without jQuery. For a long time I used jQuery, I found it convenient, but with today's performance requirements that directly impact SEO, every little ms is a ms gained.

Dom ready or not

A classic example is the use of the document.ready..., which is actually useless. I f you use a defer on your scripts (hint: you should!), they are already executed when the dom is ready... no need to add a layer.

$.each in vanilla js

One thing that we often find ourselves doing, is to loop on a list of elements of the dom. In modern native javascript (IE11+) nothing could be easier:

document
.querySelectorAll(selector)
.forEach(function (item) {
  item.addEventListener("click", function (e) {
    e.preventDefault();
    console.log(item);
  });
});

Classy without jQuery

Another classic example is sticky headers. Why use jQuery when a few lines are enough?

if (window.pageYOffset > sticky) {
  header.classList.add("sticky");
} else {
  header.classList.remove("sticky");
}

Or do you just want to show or hide a block? Here is another example

item.addEventListener("click", function (e) {
  e.preventDefault();
  var t = document.querySelector(this.getAttribute("href"));
  if (window.getComputedStyle(t).display === "none") {
    t.style.display = "block";
  } else {
    t.style.display = "none";
  }
});

Note the "getComputedStyle" that lets you know whether the element is visible or hidden, whether it is via the style attribute or a css class.

Attaching behaviours

What would jQuery be without its famous plugins! Fortunately more and more javascript components take a multi framework approach and are essential written in "pure" javascript with just a wrapper around it to react, view, angular... Well, not all of them unfortunately, there are still some components that are written only for a given library.

I recently published ModularBehaviour.js which allows to attach a javascript behavior to a given node. Currently, it also works with jQuery plugins, but eventually when I will have found alternatives for all my plugins, I plan to do this in "pure" js.

Happy coding to all of you!

 
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