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$store

You can use $store to conveniently access global Alpine stores registered using Alpine.store(...). For example:

<button x-data @click="$store.darkMode.toggle()">Toggle Dark Mode</button>
 
...
 
<div x-data :class="$store.darkMode.on && 'bg-black'">
...
</div>
 
 
<script>
document.addEventListener('alpine:init', () => {
Alpine.store('darkMode', {
on: false,
 
toggle() {
this.on = ! this.on
}
})
})
</script>

Given that we've registered the darkMode store and set on to "false", when the <button> is pressed, on will be "true" and the background color of the page will change to black.

Single-value stores

If you don't need an entire object for a store, you can set and use any kind of data as a store.

Here's the example from above but using it more simply as a boolean value:

<button x-data @click="$store.darkMode = ! $store.darkMode">Toggle Dark Mode</button>
 
...
 
<div x-data :class="$store.darkMode && 'bg-black'">
...
</div>
 
 
<script>
document.addEventListener('alpine:init', () => {
Alpine.store('darkMode', false)
})
</script>

→ Read more about Alpine stores

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