reactjs

问题 I am trying to implement select/unselect all functionality in reactJs but couldn't make it happen. I have made select/unselect all main header checkbox functional and the single elements can also be selected or unselected. My work link: import React, { Component } from 'react' import ReactDOM from 'react-dom' class Box extends Component{ constructor(props){ super(props); this.state = { allChecked: false, list: [ {id:1, name: "item1", isChecked: false}, {id:2, name: "item2", isChecked: false},

问题 how to delete user data while deleting the macos electron app? It seems we need to write a daemon to listen to the folders change, but how to do? do you have more clear or easier methods to handle it? packaging used electron-builder. 回答1: I use electron-localstorage to set one flag into app, while everytime you start app, which will check if the flag can get from app, if not, this was new installed and opend first time, so it will clear the old userdata. const userDataPath = app.getPath(

问题 Suppose I have an App.js that puts two components on the screen. I now want to have one component (the MyButton) trigger function in the other component (MyCanvas) in this example. If MyCanvas would include MyButton, I probably could throw from MyButton something up into MyCanvas that changes a state there. But how do I do it if both components are on the same level? I basically want to have the structure like this, MyCanvas displays something while MyButton represents a component (or

问题 I found what i need on this link https://material-ui.com/components/lists/#simple-list using material-ui. On this link there is chapter "Nested list items". This chapter have only one nested list item with method for expand more/less. I have two nested items in my sidebar. Both of them call a method handleClick for expand more/less options. I want to expand only one (clicked) nested item per click. I also want to expand less on previous item. Here is my sidebar: import React from "react";

问题 I found what i need on this link https://material-ui.com/components/lists/#simple-list using material-ui. On this link there is chapter "Nested list items". This chapter have only one nested list item with method for expand more/less. I have two nested items in my sidebar. Both of them call a method handleClick for expand more/less options. I want to expand only one (clicked) nested item per click. I also want to expand less on previous item. Here is my sidebar: import React from "react";

问题 I'm trying to style my renderItem in FlatList but elevation not working properly. Is there anything I'm wrong or this is a React Native issue? I tested ListView too but it still not working properly This is TodoItem component import React, { Component } from 'react' import { Text, View, StyleSheet } from 'react-native' const styles = StyleSheet.create({ container: { height: 60, backgroundColor: 'white', borderRadius: 10, shadowColor: '#000', shadowOffset: { width: 2, height: 2 },

问题 I'm trying to style my renderItem in FlatList but elevation not working properly. Is there anything I'm wrong or this is a React Native issue? I tested ListView too but it still not working properly This is TodoItem component import React, { Component } from 'react' import { Text, View, StyleSheet } from 'react-native' const styles = StyleSheet.create({ container: { height: 60, backgroundColor: 'white', borderRadius: 10, shadowColor: '#000', shadowOffset: { width: 2, height: 2 },

问题 I'm trying to style my renderItem in FlatList but elevation not working properly. Is there anything I'm wrong or this is a React Native issue? I tested ListView too but it still not working properly This is TodoItem component import React, { Component } from 'react' import { Text, View, StyleSheet } from 'react-native' const styles = StyleSheet.create({ container: { height: 60, backgroundColor: 'white', borderRadius: 10, shadowColor: '#000', shadowOffset: { width: 2, height: 2 },

问题 I'm trying to style my renderItem in FlatList but elevation not working properly. Is there anything I'm wrong or this is a React Native issue? I tested ListView too but it still not working properly This is TodoItem component import React, { Component } from 'react' import { Text, View, StyleSheet } from 'react-native' const styles = StyleSheet.create({ container: { height: 60, backgroundColor: 'white', borderRadius: 10, shadowColor: '#000', shadowOffset: { width: 2, height: 2 },

问题 Goal: I'm trying to loop a video infinitely on a React gatsby site. I have a mp4 file locally under assets, but it doesn't show up on my screen. What I've tried: I thought it might be a CSS issue so I set it and it's clearly width and height 100% of the window but video is still not showing up. JS: import React from "react" import "./index.css" export default () => ( <div> <video id="background-video" loop autoPlay> <source src="..\assets\video\Cenote_Squad_Cinemagraph_1500x840_Final.mp4"