如何解决this.props.history.push 不适用于 onChange 方法
我想要做的是,当用户单击下拉列表中的选项时,它充当过滤器,并将它们带到具有与其过滤匹配的特定查询参数的页面。理论上,当用户选择一个选项时,它应该使用该选项的 target.value 将他们带到该特定页面。但是当我点击不同的选项时,它对 URL 没有任何作用。它不会将用户带到任何地方,它只是停留在同一页面上。如果你手动输入这些查询参数,它会带你到需要的页面,但是带有 this.props.history.push 的方法什么都不做。而且也没有出现错误。我怎样才能让它带我到需要的页面?
App.js -
import React from 'react';
import './style.css';
import { Route,Link,Switch } from 'react-router-dom';
import UserRoute from './components/User.js';
import SelectedAge from './components/SelectAge.js';
import SelectedJob from './components/SelectJob.js';
const users = [
{
name: 'Vasila',age: 16,hobby: 'Reading Trashy Romance Novels',job: 'Programmer',id: 1
},{
name: 'Sheravgan',age: 20,hobby: 'Speaking German',id: 2
},{
name: 'Lola',age: 17,hobby: 'Loving Crickets',job: 'Designer',id: 3
},{
name: 'Jammy',hobby: 'Inventing new words',id: 4
},{
name: 'Amirjan',hobby: 'Being amazing',job: 'Neurosurgeon',id: 5
},{
name: 'Mans',age: 18,hobby: 'Taking aesthetic pics',job: 'Unknown',id: 6
}
];
export default class App extends React.Component {
constructor(props) {
super(props);
this.ageSelect = this.ageSelect.bind(this);
this.jobSelect = this.jobSelect.bind(this);
}
ageSelect(e) {
() => {
this.props.history.push(`filter_age/${e.target.value}`);
};
}
jobSelect(e) {
() => {
this.props.history.push(`/filter_job/${e.target.value}`);
};
}
render() {
return (
<div>
<Switch>
<Route
path="/"
exact
render={() => (
<div>
<h1>Our Users: </h1>
<hr />
<i>
<b>Filter by:</b>
</i>
<br />
<select id="age" placeholder="Age" onChange={this.ageSelect}>
<option value="Age" selected disabled>
Age
</option>
<option value="16">16</option>
<option value="17">17</option>
<option value="18">18</option>
<option value="19">19</option>
<option value="20">20</option>
</select>
<select
style={{ margin: 10 }}
placeholder="Job"
onChange={this.jobSelect}
>
<option value="Job" selected disabled>
Job
</option>
<option value="Programmer">Programmer</option>
<option value="Designer">Designer</option>
<option value="Neurosurgeon">Neurosurgeon</option>
<option value="Unknown">Unknown</option>
</select>
<button>
<Link to="/">Clear</Link>
</button>
<ul>
{users.map(user => (
<h3>
<li key={user.id}>
<Link to={'/user/' + user.id}>{user.name}</Link>
</li>
</h3>
))}
</ul>
</div>
)}
/>
<Route path="/user/:id" component={UserRoute} />
<Route path="/filter_age/:age" component={SelectedAge} />
<Route path="/filter_job/:job" component={SelectedJob} />
<Route path="*" component={App} />
</Switch>
</div>
);
}
}
index.js -
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';
import reportWebVitals from './reportWebVitals';
import { BrowserRouter } from 'react-router-dom';
ReactDOM.render(
<React.StrictMode>
<BrowserRouter>
<App />
</BrowserRouter>
</React.StrictMode>,document.getElementById('root')
);
您可以查看整个项目并在 this stackblitz link.
解决方法
你的函数定义不正确,函数里面的函数..
ageSelect(e) {
this.props.history.push(`filter_age/${e.target.value}`);
}
jobSelect(e) {
this.props.history.push(`/filter_job/${e.target.value}`);
};
您正在声明一个匿名函数。
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