使用受控组件完成表单

4 years ago · a9d7608f53
5 changed files with 83 additions and 7 deletions
--- a/.eslintcache
+++ b/.eslintcache
@ -1 +1 @@
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--- a/src/App.js
+++ b/src/App.js
@ -1,13 +1,10 @@
-import logo from './logo.svg';
 import './App.css';
-import NameCard from './components/NameCard';
-import LikesButton from './components/LikesButton';
-const tags = ['php','cpp','js'];
+import CommentBox from './components/CommentBox';
+
 function App() {
  return (
    <div className="App">
-      <NameCard name="blobt" number={15920229676} isHuman={1} tags={tags}/>
-      <LikesButton />
+      <CommentBox />
    </div>
  );
 }
--- a/src/components/CommentBox.js
+++ b/src/components/CommentBox.js
@ -0,0 +1,43 @@
+import React from 'react';
+
+
+class CommentBox extends React.Component {
+    constructor(props) {
+        super(props);
+        this.state = {
+            value: ''
+        }
+        this.change = this.change.bind(this);
+        this.submit = this.submit.bind(this);
+    }
+    change(event) {
+        this.setState({
+            value: event.target.value
+        });
+    }
+    submit(event){
+        console.log(this.state.value);
+        event.preventDefault();//阻止默认的提交行为
+    }
+    render() {
+        return (
+            <div>
+                <form className="p-5" onSubmit={this.submit}>
+                    <div className="form-group">
+                        <label>留言内容</label>
+                        <input
+                            type="text"
+                            className="form-control"
+                            placeholder="请输入内容"
+                            value={this.state.value}
+                            onChange={this.change}
+                        />
+                    </div>
+                    <button type="submit" className="btn btn-primary">留言</button>
+                </form>
+            </div>
+        )
+    }
+}
+
+export default CommentBox;
--- a/src/components/DigitalClock.js
+++ b/src/components/DigitalClock.js
@ -0,0 +1,35 @@
+import React from 'react';
+
+class DigitalClock extends React.Component{
+    constructor(props){
+        super(props);
+        this.state = {
+            date: new Date()
+        }
+    }
+    //这个是react的生命周期函数，插件挂载成功时候被调用
+    componentDidMount(){
+        this.timer = setInterval(() => {
+            this.setState({
+                date: new Date()
+            });
+        },1000);
+    }
+    //生命周期函数，组件发生改变时候被调用
+    componentDidUpdate(currentProps, currentState){
+        console.log(currentState);
+    }
+    //生命周期函数，组件卸载时候被调用
+    componentWillUnmount(){
+        clearInterval(this.timer);
+    }
+    render(){
+        return(
+            <div className="digital-clock-component jumbotron">
+                <h1>{this.state.date.toLocaleTimeString()}</h1>
+            </div>
+        )
+    }
+}
+
+export default DigitalClock;
--- a/src/components/LikesButton.js
+++ b/src/components/LikesButton.js
@ -10,6 +10,7 @@ class LikesButton extends React.Component {
        this.increase = this.increase.bind(this)
    }
    increase(){
+        //state的值是不能直接修改的，只能使用setState方法去修改
        this.setState({
            count: ++this.state.count
        })