编写评论留言板

4 years ago · 13b6399447
4 changed files with 49 additions and 8 deletions
--- a/.eslintcache
+++ b/.eslintcache
@ -1 +1 @@
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--- a/src/App.js
+++ b/src/App.js
@ -1,12 +1,30 @@
 import './App.css';
+import React from 'react';
+import CommentList from './components/CommentList';
 import CommentBox2 from './components/CommentBox2';

-function App() {
-  return (
-    <div className="App">
-      <CommentBox2 />
-    </div>
-  );
+class App extends React.Component {
+  constructor(props) {
+    super(props);
+    this.state = {
+      comments: ['this is my first line']
+    }
+    this.add = this.add.bind(this);
+  }
+  add(comment) {
+    this.setState({
+      comments: [...this.state.comments, comment]
+    });
+  }
+  render() {
+    const { comments } = this.state;
+    return (
+      <div>
+        <CommentList comments={comments} />
+        <CommentBox2 onAdd={this.add} count={comments.length} />
+      </div>
+    )
+  }
 }

 export default App;
--- a/src/components/CommentBox2.js
+++ b/src/components/CommentBox2.js
@ -6,7 +6,8 @@ class CommentBox2 extends React.Component {
        this.submit = this.submit.bind(this);
    }
    submit(event) {
-        console.log(this.textInput.value);
+        //console.log(this.textInput.value);
+        this.props.onAdd(this.textInput.value);
        event.preventDefault();
    }
    render() {
@ -23,6 +24,7 @@ class CommentBox2 extends React.Component {
                        />
                    </div>
                    <button type="submit" className="btn btn-primary">留言</button>
+                    <p>已有 {this.props.count} 条评论</p>
                </form>
            </div>
        )
--- a/src/components/CommentList.js
+++ b/src/components/CommentList.js
@ -0,0 +1,21 @@
+import React from 'react';
+
+class CommentList extends React.Component {
+    render() {
+        const { comments } = this.props;
+        return (
+            <div className="comment-list-component">
+                <label>评论列表</label>
+                <ul className="list-group mb-3">
+                    {
+                        comments.map((item,index) => 
+                            <li key={index} className="list-group-item">{item}</li>
+                        )
+                    }
+                </ul>
+            </div>
+        )
+    }
+}
+
+export default CommentList;