Why I use Alpine.js
Alpine.js is a great little library to add “JavaScript sprinkles of interactivity”.
That’s what JavaScript was created for in the first place: add more life to HTML pages (rather than, for example, run in the browser an entire application framework used to render HTML).
Alpine is concerned with the client-side state, with tiny little bits of JS.
For example tracking the value of an input box, or opening a modal, etc.
You could also just use “vanilla” JavaScript DOM APIs for this, but for some things, Alpine simplifies a lot our job.
I like this a lot paired with server-side HTML generation using Astro, and client-server interactions handled through htmx. Alpine is the perfect fit for this stack.
But why do I use it?
Let me answer with practical examples of how I used it to solve problems.
One need I had was to close a modal defined in a dialog
tag when I clicked outside of it.
Using vanilla JavaScript you’d have to do something like this:
function onClickOutside(element, callback) {
document.addEventListener('click', (event) => {
if (!element.contains(event.target)) {
callback()
}
}, true)
}
const targetElement = document.querySelector('#yourElementId')
onClickOutside(targetElement, () => {
document.querySelector('dialog').close()
})
You need to also come up with a good id
name for your element, and think where to put this JavaScript.
With Alpine.js, all this JavaScript can be turned into 1 line you put directly on the element:
@click.outside.capture="document.querySelector('dialog').close()"
It’s much less code, it’s declarative, I don’t have to create an id
I’ll use just for this, and the logic is local to the HTML element involved (LoB = Locality of Behavior).
Another example is showing/hiding a mobile menu when pressing a “hamburger” icon, kinda typical pattern.
With Alpine you define a showMenu
var on a container element.
I’ll simulate the hamburger icon with a show/hide
button.
<div
x-data='{showMenu : false}'>
<button
@click='showMenu = !showMenu'>
show/hide
</button>
<div x-show='showMenu'>
...the menu
</div>
...the rest of your app
</div>
Click the button to show the menu content, click again to hide it.
Those were just 2 simple examples, but I hope you got the gist.
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