Component Party 标志

Component Party 中文版

响应式

声明状态

Ember Polaris 标志 Ember Polaris

import Component from "@glimmer/component";

export default class NameComponent extends Component {
  name = "张三";

  <template>
    <h1>你好 {{this.name}}</h1>
  </template>
}

Aurelia 1 标志 Aurelia 1

<template>
  <h1>你好 ${name}</h1>
</template>

更新状态

Ember Polaris 标志 Ember Polaris

import Component from "@glimmer/component";
import { tracked } from "@glimmer/tracking";

export default class CounterComponent extends Component {
  @tracked name = "张三";

  constructor(owner, args) {
    super(owner, args);

    this.name = "李四";
  }

  <template>
    <h1>你好 {{this.name}}</h1>
  </template>
}

Aurelia 1 标志 Aurelia 1

<template>
  <h1>你好 ${name}</h1>
</template>

计算属性

Ember Polaris 标志 Ember Polaris

import Component, { tracked } from "@glimmer/component";

export default class DoubleCount extends Component {
  @tracked count = 10;

  get doubleCount() {
    return this.count * 2;
  }

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

Aurelia 1 标志 Aurelia 1

<template>
  <div>${doubleCount}</div>
</template>

模板语法

最简模板

Ember Polaris 标志 Ember Polaris

<template>
  <h1>你好，世界</h1>
</template>

Aurelia 1 标志 Aurelia 1

<template>
  <h1>你好，世界</h1>
</template>

样式

Ember Polaris 标志 Ember Polaris

<template>
  <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>
</template>

Aurelia 1 标志 Aurelia 1

.title {
  color: red;
}

DOM循环

Ember Polaris 标志 Ember Polaris

const colors = ["红", "绿", "蓝"];

<template>
  <ul>
    {{#each colors as |color|}}
      <li>{{color}}</li>
    {{/each}}
  </ul>
</template>

Aurelia 1 标志 Aurelia 1

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

点击事件

Ember Polaris 标志 Ember Polaris

import Component from "@glimmer/component";
import { tracked } from "@glimmer/tracking";

export default class Counter extends Component {
  @tracked count = 0;

  incrementCount = () => this.count++;

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

Aurelia 1 标志 Aurelia 1

<template>
  <p>计数器: ${count}</p>
  <button click.trigger="incrementCount()">+1</button>
</template>

DOM引用

Ember Polaris 标志 Ember Polaris

import { modifier } from "ember-modifier";

const autofocus = modifier((element) => element.focus());

<template>
  <input {{autofocus}} />
</template>

Aurelia 1 标志 Aurelia 1

<template>
  <input ref="inputElement" />
</template>

条件渲染

Ember Polaris 标志 Ember Polaris

import Component from "@glimmer/component";
import { tracked } from "@glimmer/tracking";

const TRAFFIC_LIGHTS = ["红灯", "黄灯", "绿灯"];

export default class TrafficLight extends Component {
  @tracked lightIndex = 0;

  get light() {
    return TRAFFIC_LIGHTS[this.lightIndex];
  }

  nextLight = () => {
    this.lightIndex = (this.lightIndex + 1) % TRAFFIC_LIGHTS.length;
  };

  <template>
    <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>
  </template>
}

Aurelia 1 标志 Aurelia 1

<template>
  <button click.trigger="nextLight()">下一个灯</button>
  <p>现在亮着的是: ${light}</p>
  <p>
    你应该
    <span if.bind="light === '红灯'">停下</span>
    <span if.bind="light === '黄灯'">慢行</span>
    <span if.bind="light === '绿灯'">赶紧走</span>
  </p>
</template>

生命周期

组件加载时

Ember Polaris 标志 Ember Polaris

const pageTitle = () => document.title;

<template>
  <p>页面标题: {{(pageTitle)}}</p>
</template>

Aurelia 1 标志 Aurelia 1

<template>
  <p>页面标题: ${pageTitle}</p>
</template>

组件卸载时

Ember Polaris 标志 Ember Polaris

import Component from "@glimmer/component";
import { tracked } from "@glimmer/tracking";
import { registerDestructor } from "@ember/destroyable";

export default class Time extends Component {
  @tracked time = new Date().toLocaleTimeString();

  constructor(owner, args) {
    super(owner, args);

    let timer = setInterval(() => {
      this.time = new Date().toLocaleTimeString();
    }, 1000);

    registerDestructor(this, () => clearInterval(timer));
  }

  <template>
    <p>当前时间: {{this.time}}</p>
  </template>
}

Aurelia 1 标志 Aurelia 1

<template>
  <p>当前时间: ${time}</p>
</template>

组件组合

组件Props传参

Ember Polaris 标志 Ember Polaris

import UserProfile from "./user-profile.gjs";

const favoriteColors = ["green", "blue", "red"];

<template>
  <UserProfile
    @name="张三"
    @age={{20}}
    @favouriteColors={{favoriteColors}}
    @isAvailable={{true}}
  />
</template>

Aurelia 1 标志 Aurelia 1

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

向父组件emit事件

Ember Polaris 标志 Ember Polaris

<template>
  <button {{on "click" @onYes}}> 是的！ </button>
  <button {{on "click" @onNo}}> 不是！ </button>
</template>

Aurelia 1 标志 Aurelia 1

<template>
  <require from="./answer-button"></require>
  <p>你快乐吗?</p>
  <answer-button action-handler.call="handleAnswer(reply)"></answer-button>
  <p style="font-size: 50px">${isHappy ? "😀" : "😥"}</p>
</template>

slot插槽

Ember Polaris 标志 Ember Polaris

import FunnyButton from "./funny-button";

<template>
  <FunnyButton>点我!</FunnyButton>
</template>

Aurelia 1 标志 Aurelia 1

<template>
  <require from="./funny-button"></require>

  <funny-button>点我!</funny-button>
</template>

slot插槽内容

Ember Polaris 标志 Ember Polaris

import FunnyButton from "./funny-button";

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

Aurelia 1 标志 Aurelia 1

<template>
  <require from="./funny-button"></require>

  <funny-button></funny-button>
  <funny-button>这是传到slot的内容!</funny-button>
</template>

上下文

Ember Polaris 标志 Ember Polaris

import UserProfile from "./user-profile";

<template>
    <UserProfile />
</template>

Aurelia 1 标志 Aurelia 1

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

表单输入

输入框

Ember Polaris 标志 Ember Polaris

import Component from "@glimmer/component";
import { tracked } from "@glimmer/tracking";

export default class InputHello extends Component {
  @tracked text = "你好世界";

  handleInput = (event) => (this.text = event.target.value);

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

Aurelia 1 标志 Aurelia 1

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

复选框

Ember Polaris 标志 Ember Polaris

import Component from "@glimmer/component";
import { tracked } from "@glimmer/tracking";

export default class InputHello extends Component {
  @tracked isAvailable = false;

  handleChange = (event) => (this.isAvailable = event.target.checked);

  <template>
    <input
      id="is-available"
      type="checkbox"
      checked={{this.isAvailable}}
      {{on "change" this.handleChange}}
    />
    <label for="is-available">这是一个checkbox</label>
  </template>
}

Aurelia 1 标志 Aurelia 1

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

单选框

Ember Polaris 标志 Ember Polaris

import Component from "@glimmer/component";
import { tracked } from "@glimmer/tracking";

export default class PickPill extends Component {
  @tracked picked = "red";

  handleChange = (event) => (this.picked = event.target.value);

  <template>
    <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>
  </template>
}

Aurelia 1 标志 Aurelia 1

<template>
  <div>你选择了: ${picked}</div>

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

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

选择器

Ember Polaris 标志 Ember Polaris

import Component from "@glimmer/component";
import { tracked } from "@glimmer/tracking";

export default class ColorSelect extends Component {
  @tracked selectedColorId = 2;

  select = (event) => (this.selectedColorId = event.target.value);

  isSelected = (colorId) => this.selectedColorId === colorId;

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

  <template>
    <select {{on "change" this.select}}>
      {{#each this.colors as |color|}}
        <option
          value={{color.id}}
          disabled={{color.isDisabled}}
          selected={{this.isSelected color.id}}
        >
          {{color.text}}
        </option>
      {{/each}}
    </select>
  </template>
}

Aurelia 1 标志 Aurelia 1

<template>
  <select value.bind="selectedColorId">
    <option value="">选择一个颜色</option>
    <option
      repeat.for="color of colors"
      value.bind="color.id"
      disabled.bind="color.isDisabled"
    >
      ${color.text}
    </option>
  </select>
</template>

Web应用特性

渲染应用

Ember Polaris 标志 Ember Polaris

<!doctype html>
<html>
  <body>
    <script type="module" src="./index.js"></script>
  </body>
</html>

Aurelia 1 标志 Aurelia 1

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

Ember Polaris 标志 Ember Polaris

import Component from "@glimmer/component";
import { tracked } from "@glimmer/tracking";

class State {
  @tracked isLoading = false;
  @tracked error = null;
  @tracked data = null;
}

function fetchUsers() {
  let state = new State();
  
  async function fetchData() {
    try {
      let response = await fetch("https://randomuser.me/api/?results=3");
      let { results: users } = await response.json();
      state.data = users;
      state.error = null;
    } catch (err) {
      state.data = null;
      state.error = err;
    }
    state.isLoading = false;
  }
  
  fetchData();
  return state;
}

export default class App extends Component {
  <template>
    {{#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.data as |user|}}
            <li>
              <img src={{user.picture.thumbnail}} alt="user" />
              <p>{{user.name.first}} {{user.name.last}}</p>
            </li>
          {{/each}}
        </ul>
      {{/if}}
    {{/let}}
  </template>
}

Aurelia 1 标志 Aurelia 1

<template>
  <p if.bind="isLoading">正在获取用户信息……</p>
  <p if.bind="error">获取用户信息出错</p>
  <ul if.bind="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>