如何将React登录组件重构为现有的材料UI登录组件？

分类：编程问答

如何解决如何将React登录组件重构为现有的材料UI登录组件？

我的目标是将现有的登录页面重构为实质性的UI登录页面。

下面是我现有的登录组件，标题为“ Navbar.js”。如您所见，状态是在此文件中管理的，还包括对SQL db /用户身份验证/等的axios调用...

我的目标是将现有的登录页面代码重构为我找到的重要的UI登录页面。我是新来的反应（状态）和实质性用户界面的人，因此非常感谢您的帮助！如果我可以提供更多材料或进行重组，以便更轻松地进行处理，请随时告诉我。谢谢！

Navbar.js（我现有的登录页面） 

import React,{ useState } from "react";
import axios from "axios";

async function attemptLogin(un,pw,setSignedIn,signedIn) {
  try {
    if (signedIn) {
      window.localStorage.setItem("jwt","");
      setSignedIn(false);
      return;
    }

    const response = await axios.post("http://localhost:4000/login",{
      username: un,password: pw,});
    console.log(response);
    if (response.data.jwt) {
      setSignedIn(true);
      window.localStorage.setItem("jwt",response.data.jwt);
    }
  } catch (error) {
    console.log(error);
  }
}
export default function Navbar({
  signedIn,setAllPlaylists,allPlaylists,fetchPlaylists,}) {
  const defaultValue = {
    un: "",pw: "",};
  const [signInForm,setSignInForm] = useState(defaultValue);

  return (
    <>
      Username:
      <input
        value={signInForm.un}
        onChange={(event) =>
          setSignInForm({ ...signInForm,un: event.target.value })
        }
      />
      Password:
      <input
        value={signInForm.pw}
        onChange={(event) =>
          setSignInForm({ ...signInForm,pw: event.target.value })
        }
        type="password"
      />
      <button
        onClick={() => {
          attemptLogin(signInForm.un,signInForm.pw,signedIn);
          setSignInForm({ ...defaultValue });
        }}
      >
        {signedIn ? "Sign Out" : "Sign In"}
      </button>
      <button onClick={fetchPlaylists}>
        {!allPlaylists ? "Show only my playlists" : "Show all playlists"}
      </button>
    </>
  );
}

SignIn.js（一个包含重要的UI登录布局的新文件） 

import React from "react";
import Avatar from "@material-ui/core/Avatar";
import Button from "@material-ui/core/Button";
import CssBaseline from "@material-ui/core/CssBaseline";
import TextField from "@material-ui/core/TextField";
import FormControlLabel from "@material-ui/core/FormControlLabel";
import Checkbox from "@material-ui/core/Checkbox";
import Link from "@material-ui/core/Link";
import Grid from "@material-ui/core/Grid";
import Box from "@material-ui/core/Box";
import LockOutlinedIcon from "@material-ui/icons/LockOutlined";
import Typography from "@material-ui/core/Typography";
import { makeStyles } from "@material-ui/core/styles";
import Container from "@material-ui/core/Container";

const useStyles = makeStyles((theme) => ({
  paper: {
    marginTop: theme.spacing(8),display: "flex",flexDirection: "column",alignItems: "center",},avatar: {
    margin: theme.spacing(1),backgroundColor: theme.palette.secondary.main,form: {
    width: "100%",// Fix IE 11 issue.
    marginTop: theme.spacing(1),submit: {
    margin: theme.spacing(3,2),}));

export default function SignIn() {
  const classes = useStyles();

  return (
    <Container component="main" maxWidth="xs">
      <CssBaseline />
      <div className={classes.paper}>
        <Avatar className={classes.avatar}>
          <LockOutlinedIcon />
        </Avatar>
        <Typography component="h1" variant="h5">
          Sign in
        </Typography>
        <form className={classes.form} noValidate>
          <TextField
            variant="outlined"
            margin="normal"
            required
            fullWidth
            id="email"
            label="Username"
            name="username"
            autoComplete="username"
            autoFocus
          />
          <TextField
            variant="outlined"
            margin="normal"
            required
            fullWidth
            name="password"
            label="Password"
            type="password"
            id="password"
            autoComplete="current-password"
          />
          <FormControlLabel
            control={<Checkbox value="remember" color="primary" />}
            label="Remember me"
          />
          <Button
            type="submit"
            fullWidth
            variant="contained"
            color="primary"
            className={classes.submit}
          >
            Sign In
          </Button>
          <Grid container>
            {/* <Grid item xs>
              <Link href="#" variant="body2">
                Forgot password?
              </Link>
            </Grid> */}
            <Grid item>
              <Link href="#" variant="body2">
                {"Don't have an account? Sign Up"}
              </Link>
            </Grid>
          </Grid>
        </form>
      </div>
      <Box mt={8}>
        <Copyright />
      </Box>
    </Container>
  );
}

解决方法

用不完整的代码很难测试。我尽力重构它。可以对其进行更多重构。还更新了沙箱。

    import React,{ useState } from "react";
    import axios from "axios";
    import Avatar from "@material-ui/core/Avatar";
    import Button from "@material-ui/core/Button";
    import TextField from "@material-ui/core/TextField";
    import FormControlLabel from "@material-ui/core/FormControlLabel";
    import Checkbox from "@material-ui/core/Checkbox";
    import Link from "@material-ui/core/Link";
    import Grid from "@material-ui/core/Grid";
    // import Box from "@material-ui/core/Box";
    import LockOutlinedIcon from "@material-ui/icons/LockOutlined";
    import Typography from "@material-ui/core/Typography";
    import { makeStyles } from "@material-ui/core/styles";
    import Container from "@material-ui/core/Container";
    
    const useStyles = makeStyles((theme) => ({
      paper: {
        marginTop: theme.spacing(8),display: "flex",flexDirection: "column",alignItems: "center"
      },avatar: {
        margin: theme.spacing(1),backgroundColor: theme.palette.secondary.main
      },form: {
        width: "100%",// Fix IE 11 issue.
        marginTop: theme.spacing(1)
      },submit: {
        margin: theme.spacing(3,2)
      }
    }));
    
    async function attemptLogin(un,pw,setSignedIn,signedIn) {
      try {
        if (signedIn) {
          window.localStorage.setItem("jwt","");
          setSignedIn(false);
          return;
        }
    
        const response = await axios.post("http://localhost:4000/login",{
          username: un,password: pw
        });
        console.log(response);
        if (response.data.jwt) {
          setSignedIn(true);
          window.localStorage.setItem("jwt",response.data.jwt);
        }
      } catch (error) {
        console.log(error);
      }
    }
    
    export default function SignIn({
      signedIn,setAllPlaylists,allPlaylists,fetchPlaylists
    }) {
      const classes = useStyles();
      const defaultValue = {
        un: "",pw: ""
      };
      const [signInForm,setSignInForm] = useState(defaultValue);
      return (
        <Container component="main" maxWidth="xs">
          <div className={classes.paper}>
            <Avatar className={classes.avatar}>
              <LockOutlinedIcon />
            </Avatar>
            <Typography component="h1" variant="h5">
              Sign in
            </Typography>
            <form className={classes.form} noValidate>
              <TextField
                variant="outlined"
                margin="normal"
                required
                fullWidth
                id="email"
                label="Username"
                name="username"
                autoComplete="username"
                autoFocus
                value={signInForm.un}
                onChange={(event) =>
                  setSignInForm({ ...signInForm,un: event.target.value })
                }
              />
              <TextField
                variant="outlined"
                margin="normal"
                required
                fullWidth
                name="password"
                label="Password"
                type="password"
                id="password"
                autoComplete="current-password"
                value={signInForm.pw}
                onChange={(event) =>
                  setSignInForm({ ...signInForm,pw: event.target.value })
                }
              />
              <FormControlLabel
                control={<Checkbox value="remember" color="primary" />}
                label="Remember me"
              />
              <Button
                type="submit"
                fullWidth
                variant="contained"
                color="primary"
                className={classes.submit}
                onClick={() => {
                  attemptLogin(signInForm.un,signInForm.pw,signedIn);
                  setSignInForm({ ...defaultValue });
                }}
              >
                {signedIn ? "Sign Out" : "Sign In"}
              </Button>
              <Grid container>
                {/* <Grid item xs>
                  <Link href="#" variant="body2">
                    Forgot password?
                  </Link>
                </Grid> */}
                <Grid item>
                  <Link href="#" variant="body2">
                    {"Don't have an account? Sign Up"}
                  </Link>
                </Grid>
              </Grid>
            </form>
          </div>
        </Container>
      );
    }

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