我本质上是完全按照语义UI响应上的example(第二个),除了我将道具向下传递两个级别。我将默认的活动状态设为“家”,但是当我单击任何链接时,都会出现此错误:
import PropTypes from 'prop-types'
import React, { Component } from 'react'
import {
Button,
Container,
Icon,
Menu,
Responsive,
Segment,
Sidebar,
Visibility,
} from 'semantic-ui-react'
import { connect } from 'react-redux'
import { bindActionCreators } from 'redux'
import { logInUser, logOutUser } from '../../store'
import Link from 'next/link';
var comparator;
const GenericIsUserLoggedInLink = React.memo(({ isHomeButton, isLoggedIn, logOutUser, route, anchorText, mobile, name, active, handleItemClick }) => {
comparator = (prevProps, nextProps) => {
if (prevProps.isHomeButton !== nextProps.setProps.isHomeButton) {
return true;
}
if (prevProps.isLoggedIn !== nextProps.setProps.isLoggedIn) {
return true;
}
if (prevProps.mobile !== nextProps.setProps.mobile) {
return true;
}
if (prevProps.active !== nextProps.setProps.active) {
return true;
}
return false;
}
function currentNav(route, name, active, handleItemClick) {
console.log("handleItemClick ", handleItemClick);
console.log("active ", active);
console.log("name ", name);
return (
<Link href={route}>
<Menu.Item
key={name}
name={name}
active={active === name}
onClick={handleItemClick} // Should I be passing name into here? i.e. handleItemClick(name)
>
</Menu.Item>
</Link>
);
}
if (isHomeButton) {
return currentNav(route, name, active, handleItemClick)
}
if (isLoggedIn) {
if (anchorText === undefined) {
return <Link href="/"><a onClick={() => logOutUser()}>Log out!</a></Link>
}
else if (mobile) {
return currentNav(route, name, active, handleItemClick)
}
else if (!(mobile)) {
return currentNav(route, name, active, handleItemClick)
}
else if (anchorText) {
return <Link href={route}><a>{anchorText}</a></Link>
}
} else {
if (route === "/login") {
return <Link href="/login"><a>Log in!</a></Link>
}
return null
}
}, comparator);
class DesktopContainer extends Component {
state = {activeItem : 'home'}
handleItemClick = (e, { name }) => this.setState({ activeItem: name })
logOutUser = () => {
const { logOutUser } = this.props
logOutUser()
}
render() {
const { GenericHeadingComponent, children, getWidth, isLoggedIn, logOutUser } = this.props
const { fixed, activeItem } = this.state
return (
<Responsive getWidth={getWidth} minWidth={Responsive.onlyTablet.minWidth}>
<Container>
<GenericIsUserLoggedInLink
isHomeButton={true}
route="/"
name='home'
active={activeItem}
handleItemClick={this.handleItemClick}
mobile={false}
/>
<GenericIsUserLoggedInLink
isLoggedIn={isLoggedIn}
route="/profile"
anchorText="Profile"
name='profile'
active={activeItem}
handleItemClick={this.handleItemClick}
mobile={false}
/>
<GenericIsUserLoggedInLink
isLoggedIn={isLoggedIn}
route="/dashboard"
anchorText="Dashboard"
name='dashboard'
active={activeItem}
handleItemClick={this.handleItemClick}
mobile={false}
/>
任何帮助将不胜感激!
UPDATE
按照柴油机的建议,我尝试过:
<GenericIsUserLoggedInLink
isHomeButton={true}
route="/"
name='home'
active={activeItem}
onClick={(e) => this.handleItemClick(e, { name })}
mobile={false}
/>
然后在呈现链接的我的函数中:
function currentNav(route, name, active) {
console.log("active ", active);
console.log("name ", name);
return (
<Link href={route}>
<Menu.Item
key={name}
name={name}
active={active === name}
>
</Menu.Item>
</Link>
);
}
但是没有骰子!
onClick={handleItemClick}
不发送第二个参数。因此,您的第二个对象是未定义的。因此,您的secondObject.name
也未定义。
您的错误说第二个参数是未定义的……什么都没有传递。
查看handling events上的文档。
有此示例:
<button onClick={(e) => this.deleteRow(id, e)}>Delete Row</button>
尝试:
onClick={(e) => this.handleItemClick(e, {name})}
您还可以重写handleItemClick,以使第二个参数不成为对象,而直接传递名称字符串。