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 may Be Creating

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

The primary time we go to the positioning, the menu shall 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 reality, it’s going to keep open till we shut it once more.

Prepared for one more problem?

1. Create the Undertaking

As a primary step, now we have to arrange the venture construction and determine the place we’ll host it.

One choice is to develop it domestically after which, as soon as prepared, add it to GitHub Pages. I’ve used this technique previously 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 price noting that relying in your CodePen plan, you’ll be capable of host a distinct variety of initiatives.

For this tutorial, as we haven’t achieved it earlier than, let’s create a CodePen Undertaking 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 gives varied starter venture templates. Right here, we’ll choose probably the most fundamental one.

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

Our venture will embody 4 related HTML information, an SCSS file that can 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 an alternative of making the kinds from scratch, we’re going to utilize Tailwind CSS, a well-liked 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 information 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 previously for some demos like this one. Be taught extra right here:

3. The HTML

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

Contained in the header we are going to place:

  • The corporate emblem
  • The hamburger icon
  • The navigation menu

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

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

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 (other than the toggle-button and menu ones that we’ll use within the JavaScript half to reference the goal parts).

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 need to dig into the documentation or browser console and see its actual use.

Simply to present you an thought, contemplate the lessons that we apply to the .menu ingredient 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 accommodates 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 can 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 can implement this performance:

And the associated SCSS kinds:

Persist Menu State on Web page Load

To this point, our menu works nice. However let’s go a step additional and learn to protect its state. That mentioned, the very first time we go to the positioning, the menu shall be invisible. Nonetheless, as quickly as we open it and shut the browser, it will 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 clear up this sort of request.

Let’s be extra particular:

  • Upon hamburger icon click on, we’ll retailer on native storage the menu-state key. Attainable values will 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 test 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 can deal with this logic:

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

You’ve Realized The best way to Use Native Storage!

We’ve simply completed, of us! At present, we realized to construct a CodePen Undertaking that makes use of Tailwind CSS for its kinds 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 ability apply them to your initiatives.

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

As Tailwind is a scorching matter in the intervening time, I’m planning to write down a Tailwind-oriented tutorial that can describe easy methods to customise its default choices or mix it with one other well-liked 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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