Reactivity

Declare state

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<h1 x-data="{ name: 'John' }" x-text="name"></h1>

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<h1>Hello ${name}</h1>

Update state

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<h1 x-data="{ name: 'John' }" x-init="name = 'Jane'" x-text="name"></h1>

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<h1>Hello ${name}</h1>

Computed state

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<h1
  x-data="{
  count : 10,
  get doubleCount() { return this.count * 2 }
}"
  x-text="doubleCount"
></h1>

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<div>${doubleCount}</div>

Templating

Minimal template

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<h1>Hello world</h1>

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<h1>Hello world</h1>

Styling

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<h1 class="title">I am red</h1>
<button style="font-size: 10rem">I am a button</button>

<style>
  .title {
    color: red;
  }
</style>

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.title {
  color: red;
}

Loop

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<ul x-data="{ colors: ['red', 'green', 'blue'] }">
  <template x-for="color in colors">
    <li x-text="color"></li>
  </template>
</ul>

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<ul>
  <li repeat.for="color of colors">${color}</li>
</ul>

Event click

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<div x-data="{ count: 0 }">
  <p>Counter: <span x-text="count"></span></p>
  <button x-on:click="count++">+1</button>
</div>

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<p>Counter: ${count}</p>
<button click.trigger="incrementCount">+1</button>

Dom ref

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<input x-init="$el.focus();" />

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<input ref="inputElement" />

Conditional

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<div
  x-data="{
  TRAFFIC_LIGHTS: ['red', 'orange', 'green'],
  lightIndex: 0,
  get light() { return this.TRAFFIC_LIGHTS[this.lightIndex] },
  nextLight() {
    this.lightIndex = (this.lightIndex + 1) % this.TRAFFIC_LIGHTS.length;
  }
}"
>
  <button x-on:click="nextLight">Next light</button>
  <p>Light is: <span x-text="light"></span></p>
  <p>
    You must
    <span x-show="light === 'red'">STOP</span>
    <span x-show="light === 'orange'">SLOW DOWN</span>
    <span x-show="light === 'green'">GO</span>
  </p>
</div>

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<button click.trigger="nextLight()">Next light</button>
<p>Light is: ${light}</p>
<p switch.bind="light">
  You must
  <span case="red">STOP</span>
  <span case="orange">SLOW DOWN</span>
  <span case="green">GO</span>
</p>

Lifecycle

On mount

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<p
  x-data="{ pageTitle: '' }"
  x-init="$nextTick(() => { pageTitle = document.title })"
>
  Page title: <span x-text="pageTitle"></span>
</p>

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<p>Page title is: ${pageTitle}</p>

On unmount

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<p
  x-data="{
  time: new Date().toLocaleTimeString(),
  timer: null,
  init() { this.timer = setInterval(() => (this.time = new Date().toLocaleTimeString()), 1000) },
  destroy() { clearInterval(this.timer) }
}"
>
  Current time: <span x-text="time"></span>
</p>

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<p>Current time: ${time}</p>

Component composition

Props

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<!--Alpine JS suggests using a server-side templating engine or another frontend framework in conjunction with Alpine to do this-->

<div
  x-data="{
  name: 'John',
  age: 20,
  favouriteColors: ['green', 'blue', 'red'],
  isAvailable: true
}"
>
  <p>My name is <span x-text="John"></span></p>
  <p>My age is <span x-text="age"></span></p>
  <p>
    My favourite colors are <span x-text="favouriteColors.join(', ')"></span>
  </p>
  <p>I am <span x-text="isAvailable ? 'available' : 'not available'"></span></p>
</div>

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<user-profile
  name.bind
  age.bind
  favourite-colors.bind="colors"
  is-available.bind="available"
></user-profile>

Emit to parent

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<div
  x-data="{ isHappy: true }"
  x-on:yes="isHappy = true"
  x-on:no="isHappy = false"
>
  <p>Are you happy?</p>
  <div>
    <button x-on:click="$dispatch('yes')">YES</button>
    <button x-on:click="$dispatch('no')">NO</button>
  </div>
  <p style="font-size: 50px" x-text="isHappy ? '😀' : '😥'"></p>
</div>

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<p>Can I come ?</p>
<answer-button action-handler.bind="handleAnswer"></answer-button>
<p style="font-size: 50px">${isHappy ? "😀" : "😥"}</p>

Slot

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<!--Alpine JS suggests using a server-side templating engine or another frontend framework in conjunction with Alpine to do this-->

<button
  x-data
  x-text="'Click me!'"
  style="
    background: rgba(0, 0, 0, 0.4);
    color: #fff;
    padding: 10px 20px;
    font-size: 30px;
    border: 2px solid #fff;
    margin: 8px;
    transform: scale(0.9);
    box-shadow: 4px 4px rgba(0, 0, 0, 0.4);
    transition: transform 0.2s cubic-bezier(0.34, 1.65, 0.88, 0.925) 0s;
    outline: 0;
  "
>
  <span>No content found</span>
</button>

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<funny-button>Click me !</funny-button>

Slot fallback

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<!--Alpine JS suggests using a server-side templating engine or another frontend framework in conjunction with Alpine to do this-->

<button
  x-data
  style="
    background: rgba(0, 0, 0, 0.4);
    color: #fff;
    padding: 10px 20px;
    font-size: 30px;
    border: 2px solid #fff;
    margin: 8px;
    transform: scale(0.9);
    box-shadow: 4px 4px rgba(0, 0, 0, 0.4);
    transition: transform 0.2s cubic-bezier(0.34, 1.65, 0.88, 0.925) 0s;
    outline: 0;
  "
>
  <span>No content found</span>
</button>

<button
  x-data
  x-text="'I got content!'"
  style="
    background: rgba(0, 0, 0, 0.4);
    color: #fff;
    padding: 10px 20px;
    font-size: 30px;
    border: 2px solid #fff;
    margin: 8px;
    transform: scale(0.9);
    box-shadow: 4px 4px rgba(0, 0, 0, 0.4);
    transition: transform 0.2s cubic-bezier(0.34, 1.65, 0.88, 0.925) 0s;
    outline: 0;
  "
>
  <span>No content found</span>
</button>

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<funny-button></funny-button>
<funny-button>Click me !</funny-button>

Context

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<h1>Welcome back, {{ user.username }}</h1>
<user-profile />

Form input

Input text

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<div x-data="{ text: 'Hello World' }">
  <p x-text="text"></p>
  <input x-model="text" />
</div>

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<p>${text}</p>
<input value.bind />

Checkbox

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<div x-data="{ isAvailable: true }">
  <input id="is-available" x-model="isAvailable" type="checkbox" />
  <label for="is-available">Is available</label>
</div>

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<input id="is-available" type="checkbox" checked.bind="isAvailable" />
<label for="is-available">Is available</label>: ${isAvailable}

Radio

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<div x-data="{ picked: 'red' }">
  <div>Picked: <span x-text="picked"></span></div>

  <input id="blue-pill" x-model="picked" type="radio" value="blue" />
  <label for="blue-pill">Blue pill</label>

  <input id="red-pill" x-model="picked" type="radio" value="red" />
  <label for="red-pill">Red pill</label>
</div>

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<div>Picked: ${picked}</div>

<input id="blue-pill" checked.bind="picked" type="radio" value="blue" />
<label for="blue-pill">Blue pill</label>

<input id="red-pill" checked.bind="picked" type="radio" value="red" />
<label for="red-pill">Red pill</label>

Select

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<div
  x-data="{
  selectedColorId: 2,
  colors: [
    { id: 1, text: 'red' },
    { id: 2, text: 'blue' },
    { id: 3, text: 'green' },
    { id: 4, text: 'gray', isDisabled: true }
  ]
}"
>
  <select x-model.number="selectedColorId">
    <template x-for="color in colors" x-bind:key="color.id">
      <option
        x-text="color.text"
        x-bind:value="color.id"
        x-bind:disabled="!!color.isDisabled"
        x-bind:selected="color.id === selectedColorId"
      ></option>
    </template>
  </select>
</div>

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<select value.bind="selectedColorId">
  <option value="">Select A Color</option>
  <option
    repeat.for="color of colors"
    value.bind="color.id"
    disabled.bind="color.isDisabled"
  >
    ${color.text}
  </option>
</select>

Webapp features

Render app

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<h1>Hello world</h1>

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<!doctype html>
<html>
  <head>
    <script type="module" src="./main.ts"></script>
  </head>

  <body>
    <app></app>
  </body>
</html>

Fetch data

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<div
  x-data="
		function fetchUsers() {
			return {
				users: null,
				isLoading: false,
				error: null,
				async init() {
					this.isLoading = true;
					try {
						this.users = (await (await fetch('https://randomuser.me/api/?results=3')).json()).results;
					} catch (err) {
						this.users = [];
						this.error = err
					}
					this.isLoading = false;
				},
			};
		}
	"
>
  <template x-if="isLoading">
    <p>Loading...</p>
  </template>

  <template x-if="error">
    <p>Error fetching users</p>
  </template>
  <template x-if="!error">
    <ul>
      <template x-for="user in users">
        <li>
          <img
            :src="user.picture.thumbnail"
            :alt="`picture of ${user.name.first} ${user.name.last}`"
          />
          <p x-text="`${user.name.first} ${user.name.last}`"></p>
        </li>
      </template>
    </ul>
  </template>
</div>

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<template promise.bind="useFetchUsers.fetchData()">
  <p pending>Fetching users...</p>
  <p catch>An error ocurred while fetching users</p>
  <ul then.from-view="users">
    <li repeat.for="user of users">
      <img src.bind="user.picture.thumbnail" alt="user" />
      <p>${ user.name.first } ${ user.name.last }</p>
    </li>
  </ul>
</template>