reactjs React:单击按钮时无法加载页面,加载问号

eufgjt7s  于 2023-02-15  发布在  React
关注(0)|答案(1)|浏览(161)

由于某些未知的原因,我似乎无法访问程序中的下一页,而是在localhost后面显示了这个奇怪的问号。
App.js:

import './App.css';
import Login from './Login.js';
import CommentsForm from './CommentsForm.js';
import ThankYouForm from './ThankYouForm.js';
import { Route, Routes, Router, Navigate, BrowserRoutes, Switch, Redirect, BrowserRouter } from 'react-router-dom';
import React, { useState } from "react";

function App() {
  const [comments, setComments] = useState(); //store the comments
  //routing the application to three pages: A Login page, A Comments form, and Thank you form
  //Phone Number: 6474579858
  return (
    <div>
      <BrowserRouter>
      <Routes>
      
        <Route path = '/' element={<Login/>} />
        <Route path= '/login' element={<Login/>} />
        <Route path= '/comment' element={<CommentsForm/>} />
        <Route path='/thanks' element={<ThankYouForm/>} />
        

        </Routes>
      </BrowserRouter>
      
    </div>
  );
}

export default App;

login.js:

import React, { useState } from 'react';
import { Navigate, useNavigate} from 'react-router-dom';
import CommentsForm from './CommentsForm.js';

export function Login() { 
    const [email, setEmail] = useState('');
    const [password, setPassword] = useState('');
  
    function handleSubmit(){
      
      const navigate = useNavigate;

      navigate('/comment');
    };
  
    return (
      
      <form onSubmit={handleSubmit}>

        
        <div>
         
 
  
          <label htmlFor="email">Email:</label>
          <input
            type="email"
            id="email"
            value={email}
            onChange={(e) => setEmail(e.target.value)}
            required
          />
        </div>
        <div>
          <label htmlFor="password">Password:</label>
          <input
            type="password"
            id="password"
            value={password}
            onChange={(e) => setPassword(e.target.value)}
            required
          />
        </div>
        <button onClick={<CommentsForm/>} >Login</button>
      </form>
    );
  };
  
  export default Login;

我知道所有这些页面都加载了,但唯一的问题是实际加载页面。最终发生的是,页面似乎加载,但它却显示一个“http://localhost:3000/?'。当检查网站本身的错误时,它说没有正确的onClick命令,即使我添加了一个。希望我很快得到这个问题的答案。

oknwwptz

oknwwptz1#

您的代码中存在一些问题,让我们一起解决它们:
1.由于您已经在表单元素中设置了onSubmit事件处理程序函数,因此可以删除onClick处理程序。
1.您忘记在handleSubmit处理程序中调用event.preventDefault(),这将触发页面在单击按钮后重新加载

  1. useNavigate是一个React Hook,只能在顶级调用(请参见Rules of Hooks),而不能在函数内部调用。此外,您需要调用它,而不仅仅是赋值它。
    下面是Login.js组件的工作代码:
import React, { useState } from 'react';
import { useNavigate } from 'react-router-dom';

export function Login() {
  const [email, setEmail] = useState('');
  const [password, setPassword] = useState('');
  const navigate = useNavigate();

  function handleSubmit(event) {
    event.preventDefault();
    navigate('/comment');
  }

  return (
    <form onSubmit={handleSubmit}>
      <div>
        <label htmlFor="email">Email:</label>
        <input
          type="email"
          id="email"
          value={email}
          onChange={(e) => setEmail(e.target.value)}
          required
        />
      </div>
      <div>
        <label htmlFor="password">Password:</label>
        <input
          type="password"
          id="password"
          value={password}
          onChange={(e) => setPassword(e.target.value)}
          required
        />
      </div>
      <button>Login</button>
    </form>
  );
}

export default Login;

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