Javascript 自定义反应下拉菜单未正确打开或关闭
目前,我有一个表中的3行。每行有两列:文件名和按钮Javascript 自定义反应下拉菜单未正确打开或关闭,javascript,reactjs,menu,use-effect,Javascript,Reactjs,Menu,Use Effect,目前,我有一个表中的3行。每行有两列:文件名和按钮 文件名只是一个虚拟链接 按钮将隐藏并显示菜单 我的要求如下: 单击一个按钮,它将切换菜单。i、 e.如果prev it关闭,则应打开。如果prev打开,则关闭 当您单击此按钮时,如果其他菜单处于打开状态,则它们应处于关闭状态 每次仅打开一个菜单 git克隆、npm安装、npm启动 我有以下代码 import React, {useState, useEffect} from 'react'; function Menu({butto
- 文件名只是一个虚拟链接
- 按钮将隐藏并显示菜单
- 单击一个按钮,它将切换菜单。i、 e.如果prev it关闭,则应打开。如果prev打开,则关闭
- 当您单击此按钮时,如果其他菜单处于打开状态,则它们应处于关闭状态
- 每次仅打开一个菜单
git克隆、npm安装、npm启动
我有以下代码
import React, {useState, useEffect} from 'react';
function Menu({buttonName, menuIndex, currRowInd, setCurrRowInd}) {
// inside menu
const [open, setOpen] = useState(false);
const [showMenu, setShowMenu] = useState(false);
const menuItems = {download: 'download', view: 'view', delete: 'delete'};
useEffect(() => {
if (open && menuIndex === currRowInd) {
setShowMenu(true);
} else {
setShowMenu(false);
}
}, [open, currRowInd]);
return (
<div>
<button
onClick={event => {
// it is mouse click
if (event.pageX !== 0 && event.pageY !== 0) {
// toggle
setOpen(!open);
setCurrRowInd(menuIndex);
}
}}
>
{buttonName}
</button>
{showMenu && (
<ul style={{padding: '5px', margin: '10px', border: '1px solid #ccc'}}>
{Object.keys(menuItems).map((item, itemIndex) => {
return (
<li
tabIndex="0"
key={itemIndex}
style={{
listStyle: 'none',
padding: '5px',
backgroundColor: 'blue'
}}
>
{item}
</li>
);
})}
</ul>
)}
</div>
);
}
function TableElement() {
const [currRowInd, setCurrRowInd] = useState('');
const items = [
{
file: 'file1',
button: 'button1'
},
{
file: 'file2',
button: 'button2'
},
{
file: 'file3',
button: 'button3'
}
];
return (
<table style={{borderCollapse: 'collapse', border: '1px solid black'}}>
<tbody>
{items.map((item, index) => {
return (
<tr key={index}>
<td style={{border: '1px solid black'}}>
<a href="#">{item.file}</a>
</td>
<td style={{border: '1px solid black'}}>
<Menu
buttonName={item.button}
menuIndex={index}
currRowInd={currRowInd}
setCurrRowInd={setCurrRowInd}
/>
</td>
</tr>
);
})}
</tbody>
</table>
);
}
function App() {
return (
<>
<TableElement />
</>
);
}
export default App;
import React,{useState,useffect}来自“React”;
功能菜单({buttonName,menuIndex,currRowInd,setcurrowind}){
//内部菜单
const[open,setOpen]=useState(false);
const[showMenu,setShowMenu]=使用状态(false);
const menuItems={download:'download',view:'view',delete:'delete'};
useffect(()=>{
如果(打开和菜单索引===currowind){
设置显示菜单(真);
}否则{
设置显示菜单(假);
}
},[open,Currowind]);
返回(
{
//这是鼠标点击
如果(event.pageX!==0&&event.pageY!==0){
//拨动
setOpen(!open);
设置当前索引(menuIndex);
}
}}
>
{buttonName}
{showMenu&&(
{Object.keys(menuItems).map((项,项索引)=>{
返回(
-
{item}
);
})}
)}
);
}
函数TableElement(){
const[currowind,setcurrowind]=useState(“”);
常数项=[
{
文件:'file1',
按钮:“按钮1”
},
{
文件:'file2',
按钮:“按钮2”
},
{
文件:“file3”,
按钮:“按钮3”
}
];
返回(
{items.map((项,索引)=>{
返回(
);
})}
);
}
函数App(){
返回(
);
}
导出默认应用程序;
我有一个错误:
有什么想法吗?您不需要菜单组件中的所有状态,这只会增加很多复杂性。您的问题只需移除它,并更换一些道具即可解决
功能菜单({buttonName,showMenu,handleClick}){
const menuItems={download:'download',view:'view',delete:'delete'};
返回(
{
//这是鼠标点击
如果(event.pageX!==0&&event.pageY!==0){
//拨动
handleClick();
}
}}
>
{buttonName}
{showMenu&&(
{Object.keys(menuItems).map((项,项索引)=>{
返回(
-
{item}
);
})}
)}
);
}
函数TableElement(){
//数字是更好的默认值。-1永远不会匹配
const[currowind,setcurrowind]=useState(-1);
常数项=[
{
文件:'file1',
按钮:“按钮1”
},
{
文件:'file2',
按钮:“按钮2”
},
{
文件:“file3”,
按钮:“按钮3”
}
];
返回(
{items.map((项,索引)=>{
返回(
{
//拨动
如果(索引!==currowind)设置currowind(索引)
else setcurrowind(-1)
}}
/>
);
})}
);
}
您不需要菜单组件中的所有状态,这只会增加很多复杂性。您的问题只需移除它,并更换一些道具即可解决
功能菜单({buttonName,showMenu,handleClick}){
const menuItems={download:'download',view:'view',delete:'delete'};
返回(
{
//这是鼠标点击
如果(event.pageX!==0&&event.pageY!==0){
//拨动
handleClick();
}
}}
>
{buttonName}
{showMenu&&(
{Object.keys(menuItems).map((项,项索引)=>{
返回(
-
{item}
);
})}
)}
);
}
函数TableElement(){
//数字是更好的默认值。-1永远不会匹配
const[currowind,setcurrowind]=useState(-1);
常数项=[
{
文件:'file1',
按钮:“按钮1”
},
{
文件:'file2',
按钮:“按钮2”
},
{
文件:“file3”,
按钮:“按钮3”
}
function Menu({buttonName, showMenu, handleClick}) {
const menuItems = {download: 'download', view: 'view', delete: 'delete'};
return (
<div>
<button
onClick={event => {
// it is mouse click
if (event.pageX !== 0 && event.pageY !== 0) {
// toggle
handleClick();
}
}}
>
{buttonName}
</button>
{showMenu && (
<ul style={{padding: '5px', margin: '10px', border: '1px solid #ccc'}}>
{Object.keys(menuItems).map((item, itemIndex) => {
return (
<li
tabIndex="0"
key={itemIndex}
style={{
listStyle: 'none',
padding: '5px',
backgroundColor: 'blue'
}}
>
{item}
</li>
);
})}
</ul>
)}
</div>
);
}
function TableElement() {
// number is a better default. -1 will never match
const [currRowInd, setCurrRowInd] = useState(-1);
const items = [
{
file: 'file1',
button: 'button1'
},
{
file: 'file2',
button: 'button2'
},
{
file: 'file3',
button: 'button3'
}
];
return (
<table style={{borderCollapse: 'collapse', border: '1px solid black'}}>
<tbody>
{items.map((item, index) => {
return (
<tr key={index}>
<td style={{border: '1px solid black'}}>
<a href="#">{item.file}</a>
</td>
<td style={{border: '1px solid black'}}>
<Menu
buttonName={item.button}
showMenu={index === currRowInd}
handleClick={() => {
// toggle
if (index !== currRowInd) setCurrRowInd(index)
else setCurrRowInd(-1)
}}
/>
</td>
</tr>
);
})}
</tbody>
</table>
);
}
import React, { useState } from 'react';
const Menu = ({
buttonName,
menuIndex,
opened,
handleClickButton
}) => {
const menuItems = {
download: 'download',
view: 'view',
delete: 'delete'
};
return (
<div>
<button onClick={(e) => handleClickButton(menuIndex, e)}>
{buttonName}
</button>
{opened && (
<ul style={{padding: '5px', margin: '10px', border: '1px solid #ccc'}}>
{Object.keys(menuItems).map((item, itemIndex) => {
return (
<li
tabIndex="0"
key={itemIndex}
style={{
listStyle: 'none',
padding: '5px',
backgroundColor: 'blue'
}}
>
{item}
</li>
);
})}
</ul>
)}
</div>
);
}
const TableElement = _ => {
const [currRowInd, setCurrRowInd] = useState(null);
const items = [
{
file: 'file1',
button: 'button1'
},
{
file: 'file2',
button: 'button2'
},
{
file: 'file3',
button: 'button3'
}
];
const handleButtonClick = (menuIndex, e) => {
setCurrRowInd(menuIndex);
}
return (
<table style={{borderCollapse: 'collapse', border: '1px solid black'}}>
<tbody>
{items.map((item, index) => {
return (
<tr key={index}>
<td style={{border: '1px solid black'}}>
<a href="#">{item.file}</a>
</td>
<td style={{border: '1px solid black'}}>
<Menu
buttonName={item.button}
menuIndex={index}
opened={currRowInd === index}
handleClickButton={handleButtonClick}
/>
</td>
</tr>
);
})}
</tbody>
</table>
);
}
const App = _ => {
return (
<>
<TableElement />
</>
);
}
export default App;