Wednesday April 28, 2021 By David Quintanilla
How to Preserve the Menu State on Page Load (Using Local Storage)

Final product imageFinal product imageFinal product image
What You will Be Creating

On this tutorial, we’ll create a easy static web site with Tailwind CSS after which discover ways to protect its menu state on web page load.

The primary time we go to the positioning, the menu might be hidden. Nonetheless, as quickly as we open it and shut the browser, we’ll use native storage and JavaScript to maintain the menu will open the subsequent time we go to the positioning. In truth, it’ll keep open till we shut it once more.

Prepared for an additional problem?

1. Create the Mission

As a primary step, we’ve got to arrange the undertaking construction and determine the place we’ll host it.

One possibility is to develop it domestically after which, as soon as prepared, add it to GitHub Pages. I’ve used this technique up to now for various demos. For instance, check out this one that customizes Bootstrap 4 tabs.

An alternate strategy is to make use of CodePen Projects for each the event and internet hosting. It’s value noting that relying in your CodePen plan, you’ll be capable to host a special variety of initiatives.

For this tutorial, as we haven’t accomplished it earlier than, let’s create a CodePen Mission and make the most of all of the highly effective options that include it.

How to create a CodePen ProjectHow to create a CodePen ProjectHow to create a CodePen Project

By default, CodePen offers numerous starter undertaking templates. Right here, we’ll choose essentially the most primary one.

The selected starter template for our CodePen ProjectThe selected starter template for our CodePen ProjectThe selected starter template for our CodePen Project

Our undertaking will embody 4 comparable HTML recordsdata, an SCSS file that may compile to a CSS one, and a JavaScript file, like this:

The project structureThe project structureThe project structure

Final however not least, you may export and run it out of your native machine.

You can export a CodePen ProjectYou can export a CodePen ProjectYou can export a CodePen Project

2. Tailwind CSS

As a substitute of making the types from scratch, we’re going to utilize Tailwind CSS, a preferred new utility-first CSS framework that has gained a whole lot of traction from builders. Created by Adam Wathan, its philosophy is to maneuver all of the complexity to the HTML recordsdata by including pre-existing lessons to the weather.

Tailwind CSS frameworkTailwind CSS frameworkTailwind CSS framework

As I at all times favored this idea, I’ve adopted it up to now for some demos like this one. Study extra right here:

3. The HTML

All HTML recordsdata will comprise a header and a few dummy content material.

Contained in the header we’ll place:

  • The corporate brand
  • The hamburger icon
  • The navigation menu

We’ll additionally want to incorporate the next required recordsdata:

  • The Tailwind CSS file
  • Our personal CSS and JavaScript recordsdata

To make the hamburger icon a bit extra accessible, we’ll use the aria-label, aria-expanded, and aria-controls ARIA attributes. As we’ll see in a while, the values of the primary two attributes will change relying on the menu state.

Right here’s the markup for the index.html web page:

Don’t really feel overwhelmed by the quantity of helper CSS lessons. These are all coming from Tailwind CSS (aside from the toggle-button and menu ones that we’ll use within the JavaScript half to reference the goal components).

As this isn’t a Tailwind tutorial, I’m not going to clarify what every class does. Most of those are self-explanatory, however there are some others like text-5xl that aren’t so clear, so that you’ll must dig into the documentation or browser console and see its precise use.

Simply to provide you an concept, take into account the lessons that we apply to the .menu factor together with the generated CSS:

Utility Class Generated CSS
flex show: flex;
transition-property: remodel;
transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
transition-duration: 150ms;
--tw-translate-x: 0;
--tw-translate-y: 0;
--tw-rotate: 0;
--tw-skew-x: 0;
--tw-skew-y: 0;
--tw-scale-x: 1;
--tw-scale-y: 1;
remodel: translateX(var(--tw-translate-x)) translateY(var(--tw-translate-y)) rotate(var(--tw-rotate)) skewX(var(--tw-skew-x)) skewY(var(--tw-skew-y)) scaleX(var(--tw-scale-x)) scaleY(var(--tw-scale-y));
translate-y-full --tw-translate-y: 100%;

4. Toggle the Menu

Every time we click on on the menu hyperlink, the next actions will occur:

  • We’ll toggle its is-active class. If it incorporates this class, will probably be transformed easily to a minus icon. 
  • We’ll toggle the translate-y-full class of the menu. It is a Tailwind class that may decide whether or not the menu will seem or not.
  • Relying on the menu state, we’ll replace the aria-label and aria-expanded ARIA attributes.

Right here’s the JavaScript code that may implement this performance:

And the associated SCSS types:

Persist Menu State on Web page Load

To this point, our menu works nice. However let’s go a step additional and discover ways to protect its state. That mentioned, the very first time we go to the positioning, the menu might be invisible. Nonetheless, as quickly as we open it and shut the browser, this may stay open the subsequent time we go to the positioning till we shut it once more.

It is a good case for exhibiting how native storage can remedy this type of request.

Let’s be extra particular:

  • Upon hamburger icon click on, we’ll retailer on native storage the menu-state key. Potential values might be open and closed.
Store the menu state in local storageStore the menu state in local storageStore the menu state in local storage
  • When the web page hundreds, we’ll examine the worth of this key. If the person has already opened the menu, the hamburger icon will obtain the is-active class, the menu will not comprise the translate-y-full class, and the ARIA-related attributes will change accordingly.
The open state of the menuThe open state of the menuThe open state of the menu

Let’s take a look at the JavaScript code that may deal with this logic:

After all, as an enchancment, you may forestall the animations from working on web page load. However I’ll depart this from now because it’s of secondary significance.

You’ve Realized The way to Use Native Storage!

We’ve simply completed, of us! In the present day, we realized to construct a CodePen Mission that makes use of Tailwind CSS for its types and persists its menu state on web page load utilizing JavaScript and native storage. I hope you’ve realized one or two new issues and also you’ll quickly have the option apply them to your initiatives.

Be at liberty to boost the demo by making the menu much more accessible or including extra Tailwind options. If that’s the case, don’t overlook to share it with us!

As Tailwind is a sizzling subject in the intervening time, I’m planning to jot down a Tailwind-oriented tutorial that may describe tips on how to customise its default choices or mix it with one other common framework like Bootstrap. If you need one thing particular like this, tell us through social media.

As at all times, thanks for studying!

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