响应式
更新状态
模板语法
样式
DOM循环
点击事件
条件渲染
Ember Octane
<button {{on "click" this.nextLight}}>下一个灯</button>
<p>现在亮着的是: {{this.light}}</p>
<p>
你应该
{{#if (eq this.light "红灯")}}
停下
{{else if (eq this.light "黄灯")}}
慢行
{{else if (eq this.light "绿灯")}}
赶紧走
{{/if}}
</p><div
x-data="{
TRAFFIC_LIGHTS: ['红灯', '黄灯', '绿灯'],
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">下一个灯</button>
<p>现在亮着的是: <span x-text="light"></span></p>
<p>
你应该
<span x-show="light === '红灯'">停下</span>
<span x-show="light === '黄灯'">慢行</span>
<span x-show="light === '绿灯'">赶紧走</span>
</p>
</div>
生命周期
组件加载时
组件组合
组件Props传参
Ember Octane
<UserProfile
@name="张三"
@age={{20}}
@favouriteColors={{array "green" "blue" "red"}}
@isAvailable={{true}}
/><!--Alpine JS suggests using a server-side templating engine or another frontend framework in conjunction with Alpine to do this-->
<div
x-data="{
name: '张三',
age: 20,
favouriteColors: ['green', 'blue', 'red'],
isAvailable: true
}"
>
<p>我的名字是 <span x-text="张三"></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>
向父组件emit事件
Ember Octane
<p>你快乐吗?</p>
<AnswerButton @onYes={{this.handleYes}} @onNo={{this.handleNo}} />
<p style="font-size: 50px;">{{if this.isHappy "😀" "😥"}}</p>slot插槽
Ember Octane
<FunnyButton> 点我! </FunnyButton><!--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="'点我!'"
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>默认slot内容</span>
</button>
slot插槽内容
Ember Octane
<FunnyButton />
<FunnyButton>这是传到slot的内容!</FunnyButton><!--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>默认slot内容</span>
</button>
<button
x-data
x-text="'这是传到slot的内容!'"
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>默认slot内容</span>
</button>
上下文
Ember Octane
<UserProfile /><!-- x-text 必须用在带有 x-data 的元素或其子元素上。 -->
<!-- 这两个元素可以共用一个带有 x-data 的父元素,也可以像下面这样分别添加 x-data: -->
<h1 x-data>
欢迎回来, <span x-text="$store.user.username">未知用户</span>
</h1>
<div x-data>
<h2>我的简介</h2>
<p>用户名: <span x-text="$store.user.username"></span></p>
<p>邮箱: <span x-text="$store.user.email"></span></p>
<button @click="$store.user.updateUsername('李四')">
更新用户名为 李四
</button>
</div>
<script>
document.addEventListener("alpine:init", () => {
Alpine.store("user", {
id: 1,
username: "abcdefg",
email: "[email protected]",
updateUsername(newUsername) {
this.username = newUsername;
},
});
});
</script>
表单输入
输入框
复选框
Ember Octane
<input
id="is-available"
type="checkbox"
checked={{this.isAvailable}}
{{on "change" this.handleChange}}
/>
<label for="is-available">这是一个checkbox</label>单选框
Ember Octane
<div>你选择了: {{this.picked}}</div>
<input
id="blue-pill"
type="radio"
value="blue"
checked={{eq this.picked "blue"}}
{{on "change" this.handleChange}}
/>
<label htmlFor="blue-pill">蓝色</label>
<input
id="red-pill"
type="radio"
value="red"
checked={{eq this.picked "red"}}
{{on "change" this.handleChange}}
/>
<label htmlFor="red-pill">红色</label>选择器
Ember Octane
<select {{on "change" this.select}}>
{{#each this.colors as |color|}}
<option
value={{color.id}}
disabled={{color.isDisabled}}
selected={{eq color.id this.selectedColorId}}
>
{{color.text}}
</option>
{{/each}}
</select><div
x-data="{
selectedColorId: 2,
colors: [
{ id: 1, text: '红' },
{ id: 2, text: '蓝' },
{ id: 3, text: '绿' },
{ id: 4, text: '灰', 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>
Web应用特性
渲染应用
Ember Octane
缺少代码片段 帮助我们改进 Component Party 
fetch获取数据
Ember Octane
{{#let (this.fetchUsers) as |request|}}
{{#if request.isLoading}}
<p>正在获取用户信息……</p>
{{else if request.error}}
<p>获取用户信息出错</p>
{{else}}
<ul>
{{#each request.users as |user|}}
<li>
<img src={{user.picture.thumbnail}} alt="user" />
<p>{{user.name.first}} {{user.name.last}}</p>
</li>
{{/each}}
</ul>
{{/if}}
{{/let}}<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>正在获取用户信息……</p>
</template>
<template x-if="error">
<p>获取用户信息出错</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>