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未捕获的不变量冲突:重新渲染过多。React限制渲染的数量以防止无限循环

material-ui redux reactjs

Slim · 技术社区 · 6 年前

我试图添加一个snackBar,以便在用户登录或不登录时显示消息。

import React from "react";
import PropTypes from "prop-types";
import classNames from "classnames";
import CheckCircleIcon from "@material-ui/icons/CheckCircle";
import ErrorIcon from "@material-ui/icons/Error";
import CloseIcon from "@material-ui/icons/Close";
import green from "@material-ui/core/colors/green";
import IconButton from "@material-ui/core/IconButton";
import Snackbar from "@material-ui/core/Snackbar";
import SnackbarContent from "@material-ui/core/SnackbarContent";
import { withStyles } from "@material-ui/core/styles";

const variantIcon = {
  success: CheckCircleIcon,
  error: ErrorIcon
};

const styles1 = theme => ({
  success: {
    backgroundColor: green[600]
  },
  error: {
    backgroundColor: theme.palette.error.dark
  },
  icon: {
    fontSize: 20
  },
  iconVariant: {
    opacity: 0.9,
    marginRight: theme.spacing.unit
  },
  message: {
    display: "flex",
    alignItems: "center"
  }
});

function SnackbarContentWrapper(props) {
  const { classes, className, message, onClose, variant, ...other } = props;
  const Icon = variantIcon[variant];

  return (
    <SnackbarContent
      className={classNames(classes[variant], className)}
      aria-describedby="client-snackbar"
      message={(
        <span className={classes.message}>
          <Icon className={classNames(classes.icon, classes.iconVariant)} />
          {message}
        </span>
      )}
      action={[
        <IconButton
          key="close"
          aria-label="Close"
          color="inherit"
          className={classes.close}
          onClick={onClose}
        >
          <CloseIcon className={classes.icon} />
        </IconButton>
      ]}
      {...other}
    />
  );
}

SnackbarContentWrapper.propTypes = {
  classes: PropTypes.shape({
    success: PropTypes.string,
    error: PropTypes.string,
    icon: PropTypes.string,
    iconVariant: PropTypes.string,
    message: PropTypes.string,
  }).isRequired,
  className: PropTypes.string.isRequired,
  message: PropTypes.node.isRequired,
  onClose: PropTypes.func.isRequired,
  variant: PropTypes.oneOf(["success", "error"]).isRequired
};

const MySnackbarContentWrapper = withStyles(styles1)(SnackbarContentWrapper);

const CustomizedSnackbar = ({
  open,
  handleClose,
  variant,
  message
}) => {
  return (
    <div>
      <Snackbar
        anchorOrigin={{
          vertical: "bottom",
          horizontal: "left"
        }}
        open={open}
        autoHideDuration={6000}
        onClose={handleClose}
      >
        <MySnackbarContentWrapper
          onClose={handleClose}
          variant={variant}
          message={message}
        />
      </Snackbar>
    </div>
  );
};

CustomizedSnackbar.propTypes = {
  open: PropTypes.bool.isRequired,
  handleClose: PropTypes.func.isRequired,
  variant: PropTypes.string.isRequired,
  message: PropTypes.string.isRequired
};

export default CustomizedSnackbar;

SignInFormContainer.jsx:

import React, { useState } from 'react';
import PropTypes from 'prop-types';
import { connect } from 'react-redux';
import SnackBar from '../../components/SnackBar';
import SignInForm from './SignInForm';

const SingInContainer = ({ message, variant}) => {
    const [open, setSnackBarState] = useState(false);
    const handleClose = (reason) => {
        if (reason === 'clickaway') {
          return;
        }
        setSnackBarState(false)

      };

    if (variant) {
        setSnackBarState(true);
    }
    return (
        <div>
        <SnackBar
            open={open}
            handleClose={handleClose}
            variant={variant}
            message={message}
            />
        <SignInForm/>
        </div>
    )
}

SingInContainer.propTypes = {
    variant: PropTypes.string.isRequired,
    message: PropTypes.string.isRequired
}

const mapStateToProps = (state) => {
    const {variant, message } = state.snackBar;

    return {
        variant,
        message
    }
}

export default connect(mapStateToProps)(SingInContainer);

运行应用程序时出现以下错误:

Invariant Violation: Too many re-renders. React limits the number of renders to prevent an infinite loop.
at invariant (http://localhost:9000/bundle.js:34484:15)
at dispatchAction (http://localhost:9000/bundle.js:47879:44)
at SingInContainer (http://localhost:9000/bundle.js:79135:5)
at renderWithHooks (http://localhost:9000/bundle.js:47343:18)
at updateFunctionComponent (http://localhost:9000/bundle.js:49010:20)
at beginWork (http://localhost:9000/bundle.js:50020:16)
at performUnitOfWork (http://localhost:9000/bundle.js:53695:12)
at workLoop (http://localhost:9000/bundle.js:53735:24)
at HTMLUnknownElement.callCallback (http://localhost:9000/bundle.js:34578:14)
at Object.invokeGuardedCallbackDev (http://localhost:9000/bundle.js:34628:16)

useState 钩子以改变钩条的状态。我应该用一个班级和一个 componentShouldUpdate 为了不渲染多次?

1 回复 | 直到 6 年前

GregL 6 年前

我怀疑问题在于,您正在函数组件体内立即调用您的状态设置器,这迫使React再次调用您的函数,使用相同的道具,最后再次调用状态设置器,触发React再次调用您的函数。。。。等等。

const SingInContainer = ({ message, variant}) => {
    const [open, setSnackBarState] = useState(false);
    const handleClose = (reason) => {
        if (reason === 'clickaway') {
          return;
        }
        setSnackBarState(false)

      };

    if (variant) {
        setSnackBarState(true); // HERE BE DRAGONS
    }
    return (
        <div>
        <SnackBar
            open={open}
            handleClose={handleClose}
            variant={variant}
            message={message}
            />
        <SignInForm/>
        </div>
    )
}

相反,我建议您只使用三元值有条件地设置state属性的默认值,这样您就可以得到:

const SingInContainer = ({ message, variant}) => {
    const [open, setSnackBarState] = useState(variant ? true : false); 
                                  // or useState(!!variant); 
                                  // or useState(Boolean(variant));
    const handleClose = (reason) => {
        if (reason === 'clickaway') {
          return;
        }
        setSnackBarState(false)

      };

    return (
        <div>
        <SnackBar
            open={open}
            handleClose={handleClose}
            variant={variant}
            message={message}
            />
        <SignInForm/>
        </div>
    )
}

综合演示

看这个 CodeSandbox.io demo 对于一个全面的演示,它的工作,加上你的坏组件,你可以在两者之间切换。

Josh Pittman 6 年前

在 SnackbarContentWrapper 你需要改变

<IconButton
          key="close"
          aria-label="Close"
          color="inherit"
          className={classes.close}
          onClick={onClose}
        >

到

<IconButton
          key="close"
          aria-label="Close"
          color="inherit"
          className={classes.close}
          onClick={() => onClose}
        >

相反,你可以用咖喱 handleClose 在里面 SingInContainer

const handleClose = () => (reason) => {
        if (reason === 'clickaway') {
          return;
        }
        setSnackBarState(false)

      };

Elyson Romeiro 5 年前

必须在onClick中链接事件。另外,click函数必须接收事件。看这个例子

export default function Component(props) {

    function clickEvent (event, variable){
        console.log(variable);
    }

    return (
        <div>
            <IconButton
                key="close"
                aria-label="Close"
                color="inherit"
                onClick={e => clickEvent(e, 10)}
            >
        </div>
    )
}