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webharry · Oct 25, 2020 · d6454bd · d6454bd
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diff --git a/.gitignore b/.gitignore
@@ -0,0 +1,23 @@
+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# production
+/build
+
+# misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
diff --git a/README.md b/README.md
@@ -0,0 +1,5 @@
+# 学习背景
+工作中多用的是vue框架，而自己一直没时间学习react，现在有空就把react纳入学习计划了。记录学习心得同时发布一些简单的自定义组件，希望对正在学习react的人有所帮助，一起成长。
+
+# reacr目录
+[实现select组件]()
diff --git a/package-lock.json b/package-lock.json
diff --git a/package.json b/package.json
@@ -0,0 +1,35 @@
+{
+  "name": "my-test",
+  "version": "0.1.0",
+  "private": true,
+  "dependencies": {
+    "@testing-library/jest-dom": "^4.2.4",
+    "@testing-library/react": "^9.5.0",
+    "@testing-library/user-event": "^7.2.1",
+    "classnames": "^2.2.6",
+    "react": "^17.0.1",
+    "react-dom": "^17.0.1",
+    "react-scripts": "3.4.4"
+  },
+  "scripts": {
+    "start": "react-scripts start",
+    "build": "react-scripts build",
+    "test": "react-scripts test",
+    "eject": "react-scripts eject"
+  },
+  "eslintConfig": {
+    "extends": "react-app"
+  },
+  "browserslist": {
+    "production": [
+      ">0.2%",
+      "not dead",
+      "not op_mini all"
+    ],
+    "development": [
+      "last 1 chrome version",
+      "last 1 firefox version",
+      "last 1 safari version"
+    ]
+  }
+}
diff --git a/public/favicon.ico b/public/favicon.ico
diff --git a/public/index.html b/public/index.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <meta name="theme-color" content="#000000" />
+    <meta
+      name="description"
+      content="Web site created using create-react-app"
+    />
+    <link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" />
+    <!--
+      manifest.json provides metadata used when your web app is installed on a
+      user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
+    -->
+    <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
+    <!--
+      Notice the use of %PUBLIC_URL% in the tags above.
+      It will be replaced with the URL of the `public` folder during the build.
+      Only files inside the `public` folder can be referenced from the HTML.
+
+      Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
+      work correctly both with client-side routing and a non-root public URL.
+      Learn how to configure a non-root public URL by running `npm run build`.
+    -->
+    <title>React App</title>
+  </head>
+  <body>
+    <noscript>You need to enable JavaScript to run this app.</noscript>
+    <div id="root"></div>
+    <!--
+      This HTML file is a template.
+      If you open it directly in the browser, you will see an empty page.
+
+      You can add webfonts, meta tags, or analytics to this file.
+      The build step will place the bundled scripts into the <body> tag.
+
+      To begin the development, run `npm start` or `yarn start`.
+      To create a production bundle, use `npm run build` or `yarn build`.
+    -->
+  </body>
+</html>
diff --git a/public/logo192.png b/public/logo192.png
diff --git a/public/logo512.png b/public/logo512.png
diff --git a/public/manifest.json b/public/manifest.json
@@ -0,0 +1,25 @@
+{
+  "short_name": "React App",
+  "name": "Create React App Sample",
+  "icons": [
+    {
+      "src": "favicon.ico",
+      "sizes": "64x64 32x32 24x24 16x16",
+      "type": "image/x-icon"
+    },
+    {
+      "src": "logo192.png",
+      "type": "image/png",
+      "sizes": "192x192"
+    },
+    {
+      "src": "logo512.png",
+      "type": "image/png",
+      "sizes": "512x512"
+    }
+  ],
+  "start_url": ".",
+  "display": "standalone",
+  "theme_color": "#000000",
+  "background_color": "#ffffff"
+}
diff --git a/public/robots.txt b/public/robots.txt
@@ -0,0 +1,3 @@
+# https://www.robotstxt.org/robotstxt.html
+User-agent: *
+Disallow:
diff --git a/src/App.css b/src/App.css
diff --git a/src/App.js b/src/App.js
@@ -0,0 +1,52 @@
+import React, { Fragment } from 'react';
+import './App.css';
+import Select from './components/select/index';
+
+class App extends React.Component {
+    constructor() {
+        super()
+        this.state = {
+            options:[
+                {
+                    label:'option1',
+                    value:1
+                },
+                {
+                    label:'option2',
+                    value:2
+                },
+                {
+                    label:'option3',
+                    value:3
+                },
+                {
+                    label:'option4',
+                    value:4
+                },
+                {
+                    label:'option5',
+                    value:5
+                },
+                {
+                    label:'option6',
+                    value:6
+                }
+            ],
+            labelName:'选择器名称',
+            placeholder: '请选择'
+        }
+    }
+
+    onSelectChange = (val) => {
+        console.log(val);
+    }
+
+    render(h) {
+        const { labelName, options, placeholder } = this.state;
+        return (
+            <Select labelName={labelName} options={options} placeholder={placeholder} onChange={this.onSelectChange}></Select>
+        );
+    }
+}
+
+export default App;
diff --git a/src/App.test.js b/src/App.test.js
@@ -0,0 +1,9 @@
+import React from 'react';
+import { render } from '@testing-library/react';
+import App from './App';
+
+test('renders learn react link', () => {
+  const { getByText } = render(<App />);
+  const linkElement = getByText(/learn react/i);
+  expect(linkElement).toBeInTheDocument();
+});
diff --git a/src/components/select/index.css b/src/components/select/index.css
@@ -0,0 +1,72 @@
+.select-box {
+    width: 50%;
+    height: 50px;
+    display: flex;
+    justify-content: center;
+    align-items: center;
+    box-sizing: border-box;
+    padding: 10px;
+}
+.select {
+    position: relative;
+    flex: 1;
+    height: 100%;
+}
+.select-label {
+    margin-right: 10px;
+    color: #333;
+}
+.select-input {
+    width: 100%;
+    box-sizing: border-box;
+    outline: none;
+    cursor: pointer;
+    margin: 0;
+    display: inline-block;
+    border-radius: 4px;
+    border: 1px solid #dcdfe6;
+    color: #606266;
+    font-size: inherit;
+    height: 40px;
+    line-height: 40px;
+    padding: 0 15px;
+    background-color: #fff;
+    background-image: none;
+    transition: border-color .2s cubic-bezier(.645,.045,.355,1);
+}
+.select-option {
+    position: absolute;
+    top: 40px;
+    left: 0;
+    width: 100%;
+    max-height: 274px;
+    overflow-y: auto;
+    box-sizing: border-box;
+    cursor: pointer;
+    border: 1px solid #e4e7ed;
+    border-radius: 4px;
+    background-color: #fff;
+    box-shadow: 0 2px 12px 0 rgba(0,0,0,.1);
+    margin: 5px 0;
+    padding: 6px 0;
+    z-index: 1001;
+}
+.option-item {
+    text-align: left;
+    font-size: 14px;
+    padding: 0 20px;
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    color: #606266;
+    height: 34px;
+    line-height: 34px;
+    cursor: pointer;
+}
+.option-item:hover {
+    background-color: #f5f7fa;
+}
+.hidden-option {
+    /* opacity: 0; */
+    display: none;
+}
diff --git a/src/components/select/index.jsx b/src/components/select/index.jsx
@@ -0,0 +1,83 @@
+import React,{ Component } from "react";
+import "./index.css";
+import cx from "classnames";
+
+class Select extends Component {
+    constructor(){
+        super();
+        this.state = {
+            value: '',
+            isHidden: true
+        };
+        this.selectBox = React.createRef();
+    }
+
+    componentDidMount(){
+        window.addEventListener("click", this.clickOutsideHandler);
+    }
+
+    componentWillUnmount(){
+        window.removeEventListener("click", this.clickOutsideHandler);
+    }
+
+    clickChange = (val) => {
+        console.log(val);
+        this.setState({
+            value: val.label,
+            isHidden: true
+        });
+        this.props.onChange(val);
+    }
+
+    onClickHandle = (e) => {
+        this.setState({
+            isHidden:!this.state.isHidden
+        });
+    }
+
+    clickOutsideHandler = (e) => {
+        if(
+            !this.isHidden &&
+            !this.selectBox.current.contains(e.target)
+        ) {
+            this.setState({
+                isHidden: true
+            });
+        }
+    }
+
+    render(){
+        const { value, isHidden } = this.state;
+        const { labelName, placeholder, options } = this.props;
+        return (
+            <div className="select-box" ref={this.selectBox}>
+                {labelName && <label className="select-label">{labelName}:</label>}
+                <div className="select">
+                    <input className="select-input" type="text" value={value} placeholder={placeholder} onClick={this.onClickHandle} readOnly></input>
+                    <div 
+                        className="select-option"
+                        className={cx({
+                            "select-option": true,
+                            "hidden-option": isHidden
+                        })}
+                    >
+                        {options && 
+                            options.map((item) => {
+                                return (
+                                    <div 
+                                        className="option-item"
+                                        onClick={this.clickChange.bind(this,item)} 
+                                        key={item.value}
+                                    >
+                                        {item.label}
+                                    </div>
+                                );
+                        })}
+                    </div>
+                </div>
+            </div>
+        );
+    }
+}
+
+export default Select;
diff --git a/src/components/select/index.md b/src/components/select/index.md
@@ -0,0 +1,7 @@
+# 自定义select组件
+实现思路很简单：
+* 首先，需明确组件的功能：要实现下拉选择功能，组件接收参数是一组下拉数据option，组件输出是当前选中数据。
+* 然后，编写DOM结构和样式，通过input、div标签实现选择框和下拉框，把两者包含在一个父div容器中方便实现定位。
+* 最后，完成js交互处理，点击下拉框获取数据回显input中；回传给父组件；下拉框的显示和隐藏等。
+
+详细实现见源码。
diff --git a/src/index.css b/src/index.css
@@ -0,0 +1,13 @@
+body {
+  margin: 0;
+  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
+    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
+    sans-serif;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+code {
+  font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New',
+    monospace;
+}