Component Party 标志

Component Party 中文版

响应式

声明状态

Svelte 5 标志 Svelte 5

<script>
  let name = $state("张三");
</script>

<h1>你好 {name}</h1>

Ember Octane 标志 Ember Octane

<h1>你好 {{this.name}}</h1>

更新状态

Svelte 5 标志 Svelte 5

<script>
  let name = $state("张三");
  name = "李四";
</script>

<h1>你好 {name}</h1>

Ember Octane 标志 Ember Octane

<h1>你好 {{this.name}}</h1>

计算属性

Svelte 5 标志 Svelte 5

<script>
  let count = $state(10);
  const doubleCount = $derived(count * 2);
</script>

<div>{doubleCount}</div>

Ember Octane 标志 Ember Octane

<div>{{this.doubleCount}}</div>

模板语法

最简模板

Svelte 5 标志 Svelte 5

<h1>你好，世界</h1>

Ember Octane 标志 Ember Octane

<h1>你好，世界</h1>

样式

Svelte 5 标志 Svelte 5

<h1 class="title">我是红色的</h1>
<button style="font-size: 10rem;">我是一个按钮</button>

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

Ember Octane 标志 Ember Octane

/* using: https://github.com/salsify/ember-css-modules */
.title {
  color: red;
}

DOM循环

Svelte 5 标志 Svelte 5

<script>
  const colors = ["红", "绿", "蓝"];
</script>

<ul>
  {#each colors as color (color)}
    <li>{color}</li>
  {/each}
</ul>

Ember Octane 标志 Ember Octane

<ul>
  {{#each (array "红" "绿" "蓝") as |color|}}
    <li>{{color}}</li>
  {{/each}}
</ul>

点击事件

Svelte 5 标志 Svelte 5

<script>
  let count = $state(0);

  function incrementCount() {
    count++;
  }
</script>

<p>计数器: {count}</p>
<button onclick={incrementCount}>+1</button>

Ember Octane 标志 Ember Octane

<p>计数器: {{this.count}}</p>
<button {{on "click" this.incrementCount}}>+1</button>

DOM引用

Svelte 5 标志 Svelte 5

<script>
  let inputElement;

  $effect(() => {
    inputElement.focus();
  });
</script>

<input bind:this={inputElement} />

Ember Octane 标志 Ember Octane

<input {{this.autofocus}} />

条件渲染

Svelte 5 标志 Svelte 5

<script>
  const TRAFFIC_LIGHTS = ["红灯", "黄灯", "绿灯"];
  let lightIndex = $state(0);

  const light = $derived(TRAFFIC_LIGHTS[lightIndex]);

  function nextLight() {
    lightIndex = (lightIndex + 1) % TRAFFIC_LIGHTS.length;
  }
</script>

<button onclick={nextLight}>下一个灯</button>
<p>现在亮着的是: {light}</p>
<p>
  你应该
  {#if light === "红灯"}
    <span>停下</span>
  {:else if light === "黄灯"}
    <span>慢行</span>
  {:else if light === "绿灯"}
    <span>赶紧走</span>
  {/if}
</p>

Ember Octane 标志 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>

生命周期

组件加载时

Svelte 5 标志 Svelte 5

<script>
  let pageTitle = $state("");
  $effect(() => {
    pageTitle = document.title;
  });
</script>

<p>页面标题: {pageTitle}</p>

Ember Octane 标志 Ember Octane

<p>页面标题: {{(this.pageTitle)}}</p>

组件卸载时

Svelte 5 标志 Svelte 5

<script>
  let time = $state(new Date().toLocaleTimeString());

  $effect(() => {
    const timer = setInterval(() => {
      time = new Date().toLocaleTimeString();
    }, 1000);

    return () => clearInterval(timer);
  });
</script>

<p>当前时间: {time}</p>

Ember Octane 标志 Ember Octane

<p>当前时间: {{this.time}}</p>

组件组合

组件Props传参

Svelte 5 标志 Svelte 5

<script>
  import UserProfile from "./UserProfile.svelte";
</script>

<UserProfile
  name="张三"
  age={20}
  favouriteColors={["green", "blue", "red"]}
  isAvailable
/>

Ember Octane 标志 Ember Octane

<UserProfile
  @name="张三"
  @age={{20}}
  @favouriteColors={{array "green" "blue" "red"}}
  @isAvailable={{true}}
/>

向父组件emit事件

Svelte 5 标志 Svelte 5

<script>
  import AnswerButton from "./AnswerButton.svelte";

  let isHappy = $state(true);

  function onAnswerNo() {
    isHappy = false;
  }

  function onAnswerYes() {
    isHappy = true;
  }
</script>

<p>你快乐吗?</p>
<AnswerButton onYes={onAnswerYes} onNo={onAnswerNo} />
<p style="font-size: 50px;">{isHappy ? "😀" : "😥"}</p>

Ember Octane 标志 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

Svelte 5 标志 Svelte 5

<script>
  import FunnyButton from "./FunnyButton.svelte";
</script>

<FunnyButton>点我!</FunnyButton>

Ember Octane 标志 Ember Octane

<FunnyButton> 点我! </FunnyButton>

slot插槽内容

Svelte 5 标志 Svelte 5

<script>
  import FunnyButton from "./FunnyButton.svelte";
</script>

<FunnyButton />
<FunnyButton>这是传到slot的内容!</FunnyButton>

Ember Octane 标志 Ember Octane

<FunnyButton />
<FunnyButton>这是传到slot的内容!</FunnyButton>

上下文

Svelte 5 标志 Svelte 5

<script>
  import { setContext } from "svelte";
  import UserProfile from "./UserProfile.svelte";
  import createUserState from "./createUserState.svelte.js";

  const user = createUserState({
    id: 1,
    username: "abcdefg",
    email: "[email protected]",
  });

  setContext("user", user);
</script>

<h1>欢迎回来, {user.username}</h1>
<UserProfile />

Ember Octane 标志 Ember Octane

<UserProfile />

表单输入

输入框

Svelte 5 标志 Svelte 5

<script>
  let text = $state("你好世界");
</script>

<p>{text}</p>
<input bind:value={text} />

Ember Octane 标志 Ember Octane

<p>{{this.text}}</p>
<input value={{this.text}} {{on "input" this.handleInput}} />

复选框

Svelte 5 标志 Svelte 5

<script>
  let isAvailable = $state(false);
</script>

<input id="is-available" type="checkbox" bind:checked={isAvailable} />
<label for="is-available">这是一个checkbox</label>

Ember Octane 标志 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

Svelte 5 标志 Svelte 5

<script>
  let picked = $state("red");
</script>

<div>你选择了: {picked}</div>

<input id="blue-pill" bind:group={picked} type="radio" value="blue" />
<label for="blue-pill">蓝色</label>

<input id="red-pill" bind:group={picked} type="radio" value="red" />
<label for="red-pill">红色</label>

Ember Octane 标志 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

Svelte 5 标志 Svelte 5

<script>
  let selectedColorId = $state(2);

  const colors = [
    { id: 1, text: "红" },
    { id: 2, text: "蓝" },
    { id: 3, text: "绿" },
    { id: 4, text: "灰", isDisabled: true },
  ];
</script>

<select bind:value={selectedColorId}>
  {#each colors as color}
    <option value={color.id} disabled={color.isDisabled}>
      {color.text}
    </option>
  {/each}
</select>

Ember Octane 标志 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>

Web应用特性

渲染应用

Svelte 5 标志 Svelte 5

<!doctype html>
<html>
  <body>
    <div id="app"></div>
    <script type="module" src="./app.js"></script>
  </body>
</html>

Ember Octane 标志 Ember Octane

缺少代码片段 帮助我们改进 Component Party Component Party 标志
在 Github 上贡献

fetch获取数据

Svelte 5 标志 Svelte 5

<script>
  import useFetchUsers from "./useFetchUsers.svelte.js";

  const response = useFetchUsers();
</script>

{#if response.isLoading}
  <p>正在获取用户信息……</p>
{:else if response.error}
  <p>获取用户信息出错</p>
{:else if response.users}
  <ul>
    {#each response.users as user}
      <li>
        <img src={user.picture.thumbnail} alt="user" />
        <p>
          {user.name.first}
          {user.name.last}
        </p>
      </li>
    {/each}
  </ul>
{/if}

Ember Octane 标志 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}}