Component Party 标志

Component Party 中文版

响应式

声明状态

Mithril 标志 Mithril

import m from "mithril";

export default function Name() {
  let name = "张三";

  return {
    view: () => m("h1", `你好 ${name}`),
  };
}

Aurelia 2 标志 Aurelia 2

<h1>你好 ${name}</h1>

更新状态

Mithril 标志 Mithril

import m from "mithril";

export default function Name() {
  let name = "张三";
  name = "李四";
  return {
    view: () => m("h1", `你好 ${name}`),
  };
}

Aurelia 2 标志 Aurelia 2

<h1>你好 ${name}</h1>

计算属性

Mithril 标志 Mithril

import m from "mithril";

export default function DoubleCount() {
  let count = 10;
  let doubleCount = count * 2;
  return {
    view: () => m("div", doubleCount),
  };
}

Aurelia 2 标志 Aurelia 2

<div>${doubleCount}</div>

模板语法

最简模板

Mithril 标志 Mithril

import m from "mithril";

export default function HelloWorld() {
  return {
    view: () => m("h1", "你好，世界"),
  };
}

Aurelia 2 标志 Aurelia 2

<h1>你好，世界</h1>

样式

Mithril 标志 Mithril

import "./style.css";
import m from "mithril";

export default function CssStyle() {
  return {
    view: () =>
      m(
        "div",
        m("h1.title", "我是红色的"),
        m("button", { style: { fontSize: "10rem" } }, "我是一个按钮"),
      ),
  };
}

Aurelia 2 标志 Aurelia 2

.title {
  color: red;
}

DOM循环

Mithril 标志 Mithril

import m from "mithril";

export default function Colors() {
  const colors = ["红", "绿", "蓝"];
  return {
    view: () =>
      m(
        "ul",
        colors.map((color, idx) => m("li", { key: idx }, color)),
      ),
  };
}

Aurelia 2 标志 Aurelia 2

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

点击事件

Mithril 标志 Mithril

import m from "mithril";

export default function Counter() {
  let count = 0;
  const incrementCount = () => (count = count + 1);
  return {
    view: () =>
      m(
        "div",
        m("p", `计数器: ${count}`),
        m("button", { onclick: incrementCount }, "+1"),
      ),
  };
}

Aurelia 2 标志 Aurelia 2

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

DOM引用

Mithril 标志 Mithril

import m from "mithril";

export default function InputFocused() {
  let value = "";
  return {
    view: () =>
      m("input", {
        oncreate: ({ dom }) => dom.focus(),
        type: "text",
        value,
        oninput: (e) => (value = e.target.value),
      }),
  };
}

Aurelia 2 标志 Aurelia 2

<input ref="inputElement" />

条件渲染

Mithril 标志 Mithril

import m from "mithril";
const TRAFFIC_LIGHTS = ["红灯", "黄灯", "绿灯"];

export default function TrafficLight() {
  let lightIndex = 0;
  let currentLight = () => TRAFFIC_LIGHTS[lightIndex];

  const nextLight = () => (lightIndex + 1) % TRAFFIC_LIGHTS.length;

  const instructions = () => {
    switch (currentLight()) {
      case "红灯":
        return "停下";
      case "黄灯":
        return "慢行";
      case "绿灯":
        return "赶紧走";
    }
  };

  return {
    view: () =>
      m(
        "div",
        m("button", { onclick: nextLight }, "下一个灯"),
        m("p", `现在亮着的是: ${currentLight()}`),
        m("p", "你应该 ", m("span", instructions())),
      ),
  };
}

Aurelia 2 标志 Aurelia 2

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

生命周期

组件加载时

Mithril 标志 Mithril

import m from "mithril";

export default function PageTitle() {
  return {
    view: () => m("p", `页面标题: ${document.title}`),
  };
}

Aurelia 2 标志 Aurelia 2

<p>页面标题: ${pageTitle}</p>

组件卸载时

Mithril 标志 Mithril

import m from "mithril";

export default function Time() {
  let time = new Date().toLocaleTimeString();

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

  return {
    view: () => m("p", `当前时间: ${time}`),
    onremove: () => clearInterval(timer),
  };
}

Aurelia 2 标志 Aurelia 2

<p>当前时间: ${time}</p>

组件组合

组件Props传参

Mithril 标志 Mithril

import m from "mithril";
import UserProfile from "./UserProfile.js";

export default function App() {
  return {
    view: () =>
      m(UserProfile, {
        name: "张三",
        age: 20,
        favouriteColors: ["green", "blue", "red"],
        isAvailable: true,
      }),
  };
}

Aurelia 2 标志 Aurelia 2

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

向父组件emit事件

Mithril 标志 Mithril

import m from "mithril";
export const AnswerButton = ({ attrs: { onYes, onNo } }) => ({
  view: () =>
    m(
      "div",
      m("button", { onclick: onYes }, "是的！"),
      m("button", { onclick: onNo }, "不是！"),
    ),
});

Aurelia 2 标志 Aurelia 2

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

slot插槽

Mithril 标志 Mithril

import m from "mithril";
import { FunnyButton } from "./FunnyButton.jsx";

export default function App() {
  return {
    view: () => m(FunnyButton, "点我!"),
  };
}

Aurelia 2 标志 Aurelia 2

<funny-button>点我!</funny-button>

slot插槽内容

Mithril 标志 Mithril

import m from "mithril";
import FunnyButton from "./FunnyButton.jsx";

export default function App() {
  return {
    view: () => m("", m(FunnyButton), m(FunnyButton, "这是传到slot的内容!")),
  };
}

Aurelia 2 标志 Aurelia 2

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

上下文

Mithril 标志 Mithril

import m from "mithril";
import UserProfile from "./UserProfile";

export default function App() {
  const user = {
    id: 1,
    username: "abcdefg",
    email: "[email protected]",
  };

  const updateUsername = (username) => (user.username = username);

  return {
    view: () =>
      m(
        "",
        m("h1", `欢迎回来, ${user.username}`),
        m(UserProfile, { user, updateUsername }),
      ),
  };
}

Aurelia 2 标志 Aurelia 2

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

表单输入

输入框

Mithril 标志 Mithril

import m from "mithril";

export default function InputHello() {
  let text = "你好世界";
  const handleChange = ({ target: { value } }) => (text = value);

  return {
    view: () =>
      m("", m("p", text), m("input", { value: text, onchange: handleChange })),
  };
}

Aurelia 2 标志 Aurelia 2

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

复选框

Mithril 标志 Mithril

import m from "mithril";

export default function IsAvailable() {
  let isAvailable = false;
  const onUpdate = () => (isAvailable = !isAvailable);

  return {
    view: () =>
      m(
        "",

        m("input", {
          id: "is-available",
          type: "checkbox",
          checked: isAvailable,
          onchange: onUpdate,
        }),
        m("label", { for: "is-available" }, "这是一个checkbox"),
      ),
  };
}

Aurelia 2 标志 Aurelia 2

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

单选框

Mithril 标志 Mithril

import m from "mithril";

export default function PickPill() {
  let picked = "red";
  let pills = ["red", "green", "blue"];
  const handleChange = ({ target: { value } }) => (picked = value);

  return {
    view: () =>
      m(
        "",
        m("", `你选择了: ${picked}`),
        pills.map((pill) =>
          m(
            ".",
            m("input", {
              id: pill,
              checked: picked == pill,
              type: "radio",
              value: pill,
              onchange: handleChange,
            }),
            m("label", { for: pill }, pill),
          ),
        ),
      ),
  };
}

Aurelia 2 标志 Aurelia 2

<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>

选择器

Mithril 标志 Mithril

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

export default function ColorSelect() {
  let selectedColorId = 2;

  const handleSelect = ({ target: { value } }) => (selectedColorId = value);

  return {
    view: () =>
      m(
        "select",
        { value: selectedColorId, onchange: handleSelect },
        colors.map(({ id, text, isDisabled }) =>
          m("option", { key: id, id, disabled: isDisabled, value: id }, text),
        ),
      ),
  };
}

Aurelia 2 标志 Aurelia 2

<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>

Web应用特性

渲染应用

Mithril 标志 Mithril

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

Aurelia 2 标志 Aurelia 2

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

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

fetch获取数据

Mithril 标志 Mithril

import m from "mithril";

export default function App() {
  let isLoading = false;
  let error = null;
  let users = [];

  async function fetchUsers() {
    isLoading = true;
    try {
      const { results } = await m.request(
        "https://randomuser.me/api/?results=3",
      );
      users = results;
    } catch (err) {
      error = err;
    }
    isLoading = false;
  }

  return {
    oninit: fetchUsers,
    view() {
      if (isLoading) return m("p", "正在获取用户信息……");
      if (error) return m("p", "获取用户信息出错");
      return users.map((user) =>
        m(
          "li",
          { key: user.login.uuid },
          m("img", { src: user.picture.thumbnail, alt: "user" }),
          m("p", `${user.name.first} ${user.name.last}`),
        ),
      );
    },
  };
}

Aurelia 2 标志 Aurelia 2

<template promise.bind="useFetchUsers.fetchData()">
  <p pending>正在获取用户信息……</p>
  <p catch>获取用户信息出错</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>