我在渲染页面时遇到这些错误。我的项目基于 NodeJs + React。
我正在使用这些版本。反应版本：^16.5 反应圆顶：^16.5 @material-ui/core：^4.9.1 @material-ui/icons：^4.9.1"
第一个错误：
Tooltip.js:479 Uncaught TypeError: Cannot read property 'className' of undefined
at Tooltip (Tooltip.js:479)
at renderWithHooks (react-dom.development.js:14803)
at updateForwardRef (react-dom.development.js:16816)
at beginWork (react-dom.development.js:18645)
at HTMLUnknownElement.callCallback (react-dom.development.js:188)
at Object.invokeGuardedCallbackDev (react-dom.development.js:237)
at invokeGuardedCallback (react-dom.development.js:292)
at beginWork$1 (react-dom.development.js:23203)
at performUnitOfWork (react-dom.development.js:22157)
at workLoopSync (react-dom.development.js:22130)
第二个错误：
The above error occurred in the <ForwardRef(Tooltip)> component:
in ForwardRef(Tooltip) (created by WithStyles(ForwardRef(Tooltip)))
in WithStyles(ForwardRef(Tooltip)) (created by Block)
in div (created by Block)
in Block (created by BlockAnimation)
in div (created by PoseElement)
in PoseElement (created by Context.Consumer)
in Unknown (created by BlockAnimation)
in Transition (created by PoseGroup)
in PoseGroup (created by BlockAnimation)
in div (created by BlockAnimation)
in BlockAnimation (created by Route)
in Route (created by withRouter(BlockAnimation))
in withRouter(BlockAnimation) (created by Navigation)
in div (created by Navigation)
in div (created by Navigation)
in div (created by ForwardRef(Toolbar))
in ForwardRef(Toolbar) (created by WithStyles(ForwardRef(Toolbar)))
in WithStyles(ForwardRef(Toolbar)) (created by Navigation)
in header (created by ForwardRef(Paper))
in ForwardRef(Paper) (created by WithStyles(ForwardRef(Paper)))
in WithStyles(ForwardRef(Paper)) (created by ForwardRef(AppBar))
in ForwardRef(AppBar) (created by WithStyles(ForwardRef(AppBar)))
in WithStyles(ForwardRef(AppBar)) (created by Navigation)
in div (created by Navigation)
in Navigation (created by Connect(Navigation))
in Connect(Navigation) (created by Route)
in Route (created by withRouter(Connect(Navigation)))
in withRouter(Connect(Navigation)) (created by ReduxWrapper)
in div (created by ReduxWrapper)
in ReduxWrapper (created by Connect(ReduxWrapper))
in Connect(ReduxWrapper) (created by Root)
in div (created by Root)
in Root (created by Route)
in Route
in div
in Router (created by ConnectedRouter)
in ConnectedRouter
in Provider
in AppContainer
我无法弄清楚这是什么意思。
使用这样的工具提示：
import React, { Component } from 'react';
import Tooltip from '@material-ui/core/Tooltip';
import styles from './styles.css';
class Block extends Component
{
state = {tooltipOpen:false};
open = () => {
this.setState({
tooltipOpen: true
});
}
close = () => {
this.setState({
tooltipOpen: false
});
}
render ()
{
const {
state: { tooltipOpen },
props:{num}
} = this;
return (
<div>
<div id={`block${num}`} className={`${styles['bar']} d-inline-flex`} onClick={(i)=>this.props.onClick({num})}></div>
<Tooltip title={`block${num}`} placement="bottom" open={tooltipOpen} onOpen={this.open}
onClose={this.close}
enterDelay={250}>
{`Block: ${num}`}
</Tooltip>
</div>
);
}
}
export default Block;