回答編集履歴
3
a
answer
CHANGED
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@@ -16,12 +16,12 @@
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16
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class App extends Component {
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render() {
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-
const
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const sizes = [
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{ id: 'aaa' },
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{ id: 'bbb' },
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{ id: 'ccc' }
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]
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-
return <SizeContainer
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return <SizeContainer sizes={sizes} />
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}
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}
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@@ -42,12 +42,10 @@
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}
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render() {
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-
const {
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sizeList
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-
} = this.props;
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const { sizes } = this.props;
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return (
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-
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+
sizes.map((size) => {
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return (
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<SizeButton
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key={size.id}
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@@ -75,4 +73,5 @@
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render(<App />, document.getElementById('root'));
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+
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```
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2
あ
answer
CHANGED
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@@ -1,5 +1,9 @@
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1
1
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2
2
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3
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+
上位のコンポーネントにどのボタンが今、選択されているかのstateを持たせるのがポイントになってきます。
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4
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+
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5
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+
４，５パターンくらい実装方法がありそうですが、一番基礎的なやり方で、かつ、掲載されているコードを元にする方法だと、以下のような感じになると思います。
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3
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# Demo Code
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[https://codesandbox.io/s/k96yvnw77v](https://codesandbox.io/s/k96yvnw77v)
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1
a
answer
CHANGED
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@@ -6,9 +6,21 @@
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6
6
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7
7
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```
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9
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-
import React, { Component
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9
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import React, { Component } from 'react';
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import { render } from 'react-dom';
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12
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class App extends Component {
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render() {
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const sizeList = [
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{ id: 'aaa' },
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{ id: 'bbb' },
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{ id: 'ccc' }
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]
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return <SizeContainer sizeList={sizeList} />
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}
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}
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class SizeContainer extends Component {
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constructor(props) {
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@@ -26,27 +38,21 @@
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}
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render() {
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const {
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sizeList
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} = this.props;
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return (
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-
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sizeList.map((size) => {
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return (
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-
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<SizeButton
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-
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key={size.id}
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-
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id={size.id}
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-
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isSelected={this.state.selectedButtonId === size.id}
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-
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onClick={this.handleButtonClick}
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/>
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-
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)
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key='bbb'
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id='bbb'
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isSelected={this.state.selectedButtonId === 'bbb'}
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onClick={this.handleButtonClick}
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})
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<SizeButton
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key='ccc'
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id='ccc'
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isSelected={this.state.selectedButtonId === 'ccc'}
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onClick={this.handleButtonClick}
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/>
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</Fragment>
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)
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}
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}
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@@ -64,5 +70,5 @@
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render(<
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render(<App />, document.getElementById('root'));
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```
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