質問編集履歴
5
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// property initializerを呼び出す該当箇所の４つのonClick={}
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// 以下はreturn内にあるコード
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<button
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</div>
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```
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### 前提・実現したいこと
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ありきたりなReactのリストアプリで
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ありきたりなReactのTodoリストアプリで
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onClickに関してJavaScriptの書き方によって結果が変わってくるのですが、動作するものと動作しないものとエラーを出すものの違いがいまいちわからないので説明いただければありがたいです(_ _)
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classname関係ないので省略
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<button
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className="content-button"
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onClick={() => this.confirmTodo()} // work
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onClick={this.confirmTodo} // work
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2
余分なcode省略
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```
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import React, {Component} from 'react';
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class TodoList extends Component {
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constructor(props) {
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super(props)
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this.state={
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value: '',
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todoList: []
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}
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}
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setTodo = (event) => {
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this.setState({value: event.target.value});
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}
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confirmTodo = () => {
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配列をconcatしてstateに保持する処理
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todoList: this.state.todoList.concat(this.state.value),
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value: ""
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});
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render() {
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const todoListOutputs = this.state.todoList.map(
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(todo, HelloTodoList) => {
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return(
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<li key={HelloTodoList}>{todo}</li>
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)
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}
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)
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return (
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<div className="contents">
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<h1 className="content-title">
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Todo List
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</h1>
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<ul>
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{todoListOutputs}
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</ul>
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<input
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className="content-form"
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type="text"
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value={this.state.value}
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onChange={(event) => this.setTodo(event)}
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/>
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// 該当箇所の４つのonClick={}
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// property initializerを呼び出す該当箇所の４つのonClick={}
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1
typo修正
test
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@@ -11,12 +11,6 @@
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```
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import React, {Component} from 'react';
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import ReactDOM from 'react-dom';
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import './index.css';
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import * as serviceWorker from './serviceWorker';
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@@ -44,7 +38,7 @@
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}
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confirmTodo = () => {
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this.setState({
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className="content-button"
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onClick={() => this.co
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onClick={() => this.confirmTodo()} // work
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onClick={this.co
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onClick={this.confirmTodo} // work
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onClick={() => this.co
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onClick={() => this.confirmTodo} // No respond
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onClick={this.co
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onClick={this.confirmTodo()} // Error Maximum update depth exceeded.
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>
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@@ -142,20 +136,4 @@
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ReactDOM.render(
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<TodoList />,
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document.getElementById('root')
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);
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serviceWorker.unregister();
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```
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