[英]this.props.history.push() not working in ReactJS
在 ReactJS fetch() 示例中嘗試我的手。 如前所述 this.props.history.push() 不起作用,它沒有給出錯誤,但它根本沒有重定向。 試圖在 StackOverflow 上閱讀這個問題的其他答案,但其中很多要么太復雜(有些人炫耀)要么不太清楚。
索引.js:
import React from "react";
import ReactDOM from "react-dom";
import "./index.css";
import App from "./App";
import { BrowserRouter as Router, NavLink, Switch, Route, useHistory } from "react-router-dom";
import reportWebVitals from "./reportWebVitals";
ReactDOM.render(
<React.StrictMode>
<Router>
<App />
</Router>
</React.StrictMode>,
document.getElementById("root")
);
應用程序.js:
import "./App.css";
import React from "react";
import { BrowserRouter as Router, NavLink, Switch, Route, useHistory } from "react-router-dom";
import RouterPage1 from "./RouterPage1";
import RouterPage2 from "./RouterPage2";
export default function App(props) {
let history = useHistory();
return (
<div>
<nav>
<ol>
<li>
<NavLink to="/RouterPage1">RouterPage1</NavLink>
</li>
<li>
<NavLink to="/RouterPage2">RouterPage2</NavLink>
</li>
<li>
<NavLink to="/RouterPageBoth">RouterPageBoth</NavLink>
</li>
</ol>
</nav>
<Switch>
<Route exact path="/RouterPage1">
<RouterPage1 history={history} />
</Route>
<Route exact path="/RouterPage2">
<RouterPage2 history={history} />
</Route>
</Switch>
</div>
);
}
RouterPage2.js(只粘貼了必要的代碼,為簡潔起見沒有粘貼整個組件):
addastakeholder = () => {
let newstakeholder = JSON.stringify(this.state.newstakeholder);
fetch("http://localhost:8080/OneToOneMappingPractice/add", {
method: "POST",
headers: { "Content-type": "application/json" },
body: newstakeholder,
}).then((r) => {
if (r.ok) {
//window.location.href = "/RouterPage2";
this.setState({ newstakeholder: { name: "", address: { house_number: "", streetName: "" } } });
this.props.history.push("/RouterPage2");
}
});
};
當我使用 addastakeholder() 時,它發布成功,數據正在輸入數據庫,但它沒有給我一個錯誤,也沒有重定向。 在 App.js 中,如果我使用 props 而不是 useHistory(),它會給我“this.props.history not defined”錯誤,即使我在 index.js 的 BrowserRouter 組件中包含了 App 組件。 為什么會這樣?
其次,如果我使用注釋掉的 window.location.href = "/RouterPage2",它可以工作(POST 成功),但我無法在開發工具:網絡選項卡(Firefox)中看到 POST 日志。 為什么會這樣?
嘗試了 this.context.history.push("/RouterPage2"),不起作用,同樣的未定義錯誤。
PS:編輯1:
完整的 RouterPage2.js(請忽略結果變量和相關代碼。只考慮 result2。):
import React from "react";
export default class RouterPage2 extends React.Component {
constructor(props) {
super(props);
this.state = {
stakeholders: [],
errorString: "",
newstakeholder: { name: "", address: { house_number: "", streetName: "" } },
};
}
componentDidMount() {
fetch("http://localhost:8080/OneToOneMappingPractice/getAll")
.catch((error) => this.setState({ errorString: error }))
.then((result) => result.json())
.then((result) => this.setState({ stakeholders: result }));
}
addastakeholder = () => {
let newstakeholder = JSON.stringify(this.state.newstakeholder);
fetch("http://localhost:8080/OneToOneMappingPractice/add", {
method: "POST",
headers: { "Content-type": "application/json" },
body: newstakeholder,
}).then((r) => {
if (r.ok) {
//window.location.href = "/RouterPage2";
this.setState({ newstakeholder: { name: "", address: { house_number: "", streetName: "" } } });
this.props.history.push("/RouterPage2");
}
});
};
render() {
let result, result2;
let error = false;
if (this.state.stakeholders.length > 0)
result = (
<ol>
{this.state.stakeholders.map((stakeholder) => (
<li key={stakeholder.stakeholder_id}>
{stakeholder.stakeholder_name} | {stakeholder.stakeholder_type} |
{stakeholder.stakeholder_email_id} | {stakeholder.stakeholder_contactno} |
{stakeholder.stakeholder_bankname} | {stakeholder.stakeholder_bankBranch} |
{stakeholder.stakeholder_IFSC} | {stakeholder.stakeholder_AccNo} |
{stakeholder.stakeholder_AccType} | {stakeholder.stakeholder_PAN}
</li>
))}
</ol>
);
else result = false;
if (this.state.stakeholders.length > 0)
result2 = (
<ol>
{this.state.stakeholders.map((stakeholder) => (
<li key={stakeholder.id}>
{stakeholder.name}|{stakeholder.address.house_number}|{stakeholder.address.streetName}
</li>
))}
</ol>
);
else result2 = false;
if (this.state.errorString !== "undefined") error = this.state.errorString;
let blank = false;
if (result == false) blank = <h5>There are no records to display.</h5>;
return (
<div>
<h1>Stakeholder details :</h1>
{result2}
{error}
{blank}
<form>
Name :{" "}
<input
type="text"
placeholder="Name"
value={this.state.newstakeholder.name}
onChange={(e) => {
this.setState({ newstakeholder: { ...this.state.newstakeholder, name: e.target.value } });
}}
/>
<br></br>
StreetName :{" "}
<input
type="text"
placeholder="StreetName"
value={this.state.newstakeholder.address.streetName}
onChange={(e) => {
this.setState({
newstakeholder: {
...this.state.newstakeholder,
address: { ...this.state.newstakeholder.address, streetName: e.target.value },
},
});
}}
/>
<br></br>
HouseNumber :{" "}
<input
type="text"
placeholder="HouseNumber(Digits Only)"
value={this.state.newstakeholder.address.house_number}
onChange={(e) => {
this.setState({
newstakeholder: {
...this.state.newstakeholder,
address: { ...this.state.newstakeholder.address, house_number: e.target.value },
},
});
}}
/>
<br></br>
<button type="button" onClick={this.addastakeholder}>
Add Stakeholder
</button>
</form>
</div>
);
}
}
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