在React中隐藏和显示文本
在React中隐藏和显示文本
提问于 2016-11-10 14:32:38
我很难想明白这件事。我试图在我的一个组件中显示/隐藏文本，但是我不能这样做。我收到I was clicked!消息，所以我知道函数正在被传递。我遗漏了什么？
我是否还需要声明一个visibility CSS声明，也许这就是我所缺少的？
SnippetList.jsx
import React, { Component, PropTypes } from 'react'
import { createContainer } from 'meteor/react-meteor-data';
import Snippet from './snippet'
import { Snippets } from '../../../api/collections/snippets.js'
class SnippetList extends React.Component {
constructor(props) {
super(props);
this.state = { visible: false }
this.toggleVisible = this.toggleVisible.bind(this);
}
toggleVisible() {
this.setState( { visible: !this.state.visible } )
console.log('I was clicked');
}
renderSnippets() {
return this.props.snippets.map( (snippet) => (
<Snippet
key={snippet._id}
title={snippet.title}
content={snippet.content}
onClick={this.toggleVisible}
/>
));
}
render() {
const snippets = Snippets.find({}).fetch({});
return (
snippets.length > 0
?
<ul>{this.renderSnippets()}</ul>
:
<p>No Snippets at this time</p>
)
}
}
SnippetList.propTypes = {
snippets: PropTypes.array.isRequired,
}
export default createContainer(() => {
Meteor.subscribe('snippets');
return {
snippets: Snippets.find({}).fetch()
};
}, SnippetList);Snippet.jsx
import React, { Component, PropTypes } from 'react'
export default class Snippet extends React.Component {
render() {
const visible = this.props.toggleVisible
return (
<article>
<header>
<h1 className='Snippet-title'>{this.props.title}</h1>
</header>
<div className={visible ? 'show' : 'hidden'} onClick={this.props.onClick}>
<p className='Snippet-content'>{this.props.content}</p>
</div>
</article>
)
}
}
Snippet.propTypes = {
title: PropTypes.string.isRequired,
content: PropTypes.string.isRequired
// toggleVisible: PropTypes.func.isRequired
}回答 1
Stack Overflow用户
回答已采纳
发布于 2016-11-10 15:25:54
问题是你没有通过隐藏部分作为道具。
在代码片段中，你做了const visible = this.props.toggleVisible，但是...toggleVisible不会传递给您的代码片段组件，因此它始终未定义
return this.props.snippets.map( (snippet) => (
<Snippet
key={snippet._id}
title={snippet.title}
content={snippet.content}
onClick={this.toggleVisible}
/>
));添加toggleVisible...也就是更改为这个。
return this.props.snippets.map( (snippet) => (
<Snippet
key={snippet._id}
title={snippet.title}
content={snippet.content}
toggleVisible={this.state.visible}
onClick={this.toggleVisible}
/>
));你可能也应该把你的renderSnippets绑定到这个类上……意思是将此代码添加到构造函数this.renderSnippets = this.renderSnippets.bind(this);中
现在来谈谈您的代码，为什么要将<ul>呈现为<article>的父级？ul的子类应该是一个<li>，我会重构你的组件，使其更像这样。
class SnippetList extends React.Component {
constructor(props) {
super(props);
this.state = { visible: false };
this.toggleVisible = this.toggleVisible.bind(this);
this.renderSnippets = this.renderSnippets.bind(this);
}
toggleVisible() {
this.setState( { visible: !this.state.visible } )
console.log('I was clicked');
}
renderSnippets() {
return this.props.snippets.map( (snippet) => (
<Snippet
key={snippet._id}
title={snippet.title}
content={snippet.content}
toggleVisible={this.state.visible}
onClick={this.toggleVisible}
/>
));
}
render() {
const snippets = Snippets.find({}).fetch({});
return (
snippets.length > 0
? <ul>{this.renderSnippets()}</ul>
: <p>No Snippets at this time</p>
)
}
}
export default class Snippet extends React.Component {
render() {
const {toggleVisible: visible} = this.props;
return (
<li>
<article>
<header>
<h1 className="Snippet-title">{this.props.title}</h1>
</header>
<div onClick={this.props.onClick}>
<p className={visible ? 'show Snippet-content' : 'hidden Snippet-content'}>{this.props.content}</p>
</div>
</article>
</li>
)
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/40521269
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