[英]ReactJS: Pass Data from child to parent
我刚刚拿起 React 并不能解决这个问题。
我有一个嵌入在主应用程序组件中的搜索组件。 在搜索组合中,我使用搜索栏中的输入值进行 API 调用。 但我不知道如何将数据返回给父级(我目前使用类似于 API 将返回的数据的硬编码状态对象),以将 I 传递给另一个组件。
基本上:从 Child 中的 API 获取数据,将其传递给父级并将其传递给其他 2 个子级
import React, {Component} from 'react';
import GroupItem from './components/GroupItem'
import SearchBar from './components/SearchBar'
class App extends Component {
state = {
views: [
{
name: 'Testname',
description: 'testbeschreibung',
status: 'ok'
},
{
name: 'Ein Anderer Titel',
description: 'lorem ipsum',
status: 'ok'
}
],
commands: [
{
name: 'Wieder etwas',
description: 'testbeschreibung',
status: 'ok'
}
],
search : []
}
render()
{
return (
<div>
<SearchBar/>
<h2>Views </h2>
{this.state.views.map((view) => (<GroupItem data={view} type={'view'} />))}
<h2>Commands</h2>
{this.state.commands.map((command) => (<GroupItem data={command} type={'command'} />))}
</div>
);
}
}
export default App;
import React, {Component} from 'react';
class SearchBar extends Component {
callApi(){
let search = this.refs.search.value;
fetch('http://my-awesome.api/'+search)
.then((result) => {
return result.json();
}).then((jsonResult) => {
console.log(jsonResult);
})
}
render() {
return (
<div class="input-group mb-3" id="search">
<input type="text" class="form-control" ref="search" placeholder="URL" aria-label="URL" />
<div class="input-group-append">
<button class="btn btn-outline-secondary" type="button" onClick={() => this.callApi()}>Search</button>
</div>
</div>
);
}
}
export default SearchBar;
您需要从App Component传递一个处理程序有一个prop并让它更新状态,请检查下面我编辑过的代码。
import React, {Component} from 'react';
import GroupItem from './components/GroupItem'
import SearchBar from './components/SearchBar'
class App extends Component {
state = {
views: [
{
name: 'Testname',
description: 'testbeschreibung',
status: 'ok'
},
{
name: 'Ein Anderer Titel',
description: 'lorem ipsum',
status: 'ok'
}
],
commands: [
{
name: 'Wieder etwas',
description: 'testbeschreibung',
status: 'ok'
}
],
search : []
}
handleSearchFill = (data) =>{
this.setState({search:data})
}
render()
{
return (
<div>
<SearchBar searchFill={this.handleSearchFill}/>
<h2>Views </h2>
{this.state.views.map((view) => (<GroupItem data={view} type={'view'} />))}
<h2>Commands</h2>
{this.state.commands.map((command) => (<GroupItem data={command} type={'command'} />))}
</div>
);
}
}
export default App;
import React, {Component} from 'react';
class SearchBar extends Component {
callApi(){
let search = this.refs.search.value;
fetch('http://my-awesome.api/'+search)
.then((result) => {
this.props.searchFill(result.json());
}).then((jsonResult) => {
console.log(jsonResult);
})
}
render() {
return (
<div class="input-group mb-3" id="search">
<input type="text" class="form-control" ref="search" placeholder="URL" aria-label="URL" />
<div class="input-group-append">
<button class="btn btn-outline-secondary" type="button" onClick={() => this.callApi()}>Search</button>
</div>
</div>
);
}
}
export default SearchBar;
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