redux

React TypeScript get Data Attribute From Click Event

由 泄露秘密 提交于 2020-12-08 06:15:36
问题 So I have a React component with a button which has a click handler which uses the data-* attribute. If this was straight React then I know how to get the value from the data-* attribute. However I am learning how to use TypeScript so I have no idea how to get access to this attribute. So what is the best way to get access to the data-* attribute using TypeScript? This is my JSX code for the button: <button type="button" className="NavLink" data-appMode={ AppMode.MAIN } onClick={ this

useDispatch() Error: Could not find react-redux context value; please ensure the component is wrapped in a <Provider>

由 强颜欢笑 提交于 2020-12-08 05:30:09
问题 I am trygin to use React-Redux library and I am getting the error on the title. I wrapped my components with Provider but I still get the error, only if I implement the useDispatch() hook. The app worked fine, until I added the useDispatch() line. The rest of lines regarding the dispatch function can be removed and I still get the same error. If you could help me I would really appreciate it. Thanks Here is my code: import 'react-native-gesture-handler'; import {NavigationContainer} from '

redux and react unwanted effect

由 元气小坏坏 提交于 2020-12-06 08:26:09
问题 Hello everyone 👋 I'm trying to make a cart functionality with redux. 2.Description of problem: The problem is that as soon as I want to remove a product that is not the last from my basket. Redux does delete the desired product from the store, but at the frontend I still see the product and react deletes the last product from the list (the one I didn't want to delete). I have to go to another page without reloading and returning to the basket to see react to reset If I remove the last product

redux and react unwanted effect

由 99封情书 提交于 2020-12-06 08:25:47
问题 Hello everyone 👋 I'm trying to make a cart functionality with redux. 2.Description of problem: The problem is that as soon as I want to remove a product that is not the last from my basket. Redux does delete the desired product from the store, but at the frontend I still see the product and react deletes the last product from the list (the one I didn't want to delete). I have to go to another page without reloading and returning to the basket to see react to reset If I remove the last product

React 组件化开发（二）：最新组件api

由 生来就可爱ヽ(ⅴ＜●) 提交于 2020-12-06 03:12:33
学习的过程，就是把已经实现的功能反复地，变着花样地 重构 ，直到找到最合适的点。 如果连这点觉悟都没有，那就不是一个合格的程序员。而雇主的本质是逐利，最忌讳的是重构，这个问题可以请高水平的工程师来得到 缓解 ，但不可能彻底解决。 本文知识要点 Hook 高阶组件 组件通信 上下文 React.cloneElement Hook 文档地址：https://zh-hans.reactjs.org/docs/hooks-intro.html#___gatsby hook是16.8版本新增的特性。它可以让你在不编写 class 的情况下使用 state 以及其他的 React 特性。 它具有如下特点： 在无需修改状态的情况下，复用状态逻辑。 将相关联的部分拆分为更小的函数，复杂组件将更容易理解。 更简洁，更易理解。 状态钩子 State Hook 函数型组件可以使用状态： function Example () { // 声明一个新的叫做 “count” 的 state 变量， // 数组第二个值是变更函数，参数接收的是新状态 // useState参数是初始值。 const [ count , setCount ] = useState ( 0 ); return ( <div> <p> You clicked { count } times </ p > < button

How to pass data from parent to child in react.js

由 一世执手 提交于 2020-12-03 07:13:33
问题 I have a parent component which has 1 child. I am updating my child by passing data through props. initially, it works fine but when I click on a button and update the state using setState the child gets rendered with old values by the time setState is finished. I have solved it using componentWillReceiveProps in the child but is this the right way? In the below code if I do setState in filterResults function it won't update the Emplist component . import React, { Component } from 'react';

How to pass data from parent to child in react.js

由 本小妞迷上赌 提交于 2020-12-03 07:11:39
问题 I have a parent component which has 1 child. I am updating my child by passing data through props. initially, it works fine but when I click on a button and update the state using setState the child gets rendered with old values by the time setState is finished. I have solved it using componentWillReceiveProps in the child but is this the right way? In the below code if I do setState in filterResults function it won't update the Emplist component . import React, { Component } from 'react';

Create dynamic Yup validation schema from JSON

由 ぐ巨炮叔叔 提交于 2020-12-01 09:47:36
问题 I'm trying to use Yup along with Formik in my react form. The form fields are going to be dynamic so as their validations. export const formData = [ { id: "name", label: "Full name", placeholder: "Enter full name", type: "text", required: true, value: "User name", values: [], validations: [ { type: "minLength", value: "5", error_message: "name should be atleast 5 char long" }, { type: "maxLength", value: "10", error_message: "name should be atleast 5 char long" } ] }, { id: "email", label:

昨天我收到了美团和阿里的面试，but…...

由 三世轮回 提交于 2020-11-30 23:37:52
临近毕业，浑浑噩噩了三四年，即将踏出校门，此时的内心说不恐惧和迷茫是假的，但是作为祖国未来栋梁之才的我，还是非常淡定的拿出了“你不知道的JavaScript”，认认真真的学了起来，虽然此时的思绪完全不在学习上… 经理： 小周，你去帮李晴调一下bug，咱们的产品今天要上线，尽快做完，大家早点回家。 我： 好的，没问题，交给我吧！ 晴： 周哥麻烦你了，这个功能实在是太复杂了。 我： 没事，小case，看我的！ 然后我十指在键盘上飞快的奔跑，一行行的代码就像一件完美的艺术品，一点点展示在我的眼前…不到半个小时，搞定！ 晴： 周哥你太厉害了，我一天多都没搞出来，你这么一会就解决了，你帮了我一个大忙，今晚请你吃饭！ 哇咔咔，美女，晚上，请吃饭，是不是会发生点什么…(#^.^#) 叮铃铃…，此时电话突然响了起来，打段了我一辈子的好事(•́へ•́╬) 我： 喂？您好! HR： 您好，请问是周先生吗？ 我： 是的，您是哪位？ HR： 我是美团的HR，看到您有投递给我们前端开发岗的简历，想约您参加我们的电话面试，不知道您现在是否方便？ 我： （此时内心非常的激动，美团啊！！）有时间，有时间，我需要准备什么吗？ HR： 这样的，我先向您了解一下基本情况，稍后通知我们的技术主管负责给您进行技术上的面试。 这样聊了三分钟左右的，在学校表现、是否毕业、发展规划、所学专业等，和HR结束通话后大约五分钟

Rendering GeoJSON with react-leaflet

由 ⅰ亾dé卋堺 提交于 2020-11-30 06:49:29
问题 I've got simple component to pick point on map and then display some GeoJSON data related to this point: import React, { Component } from 'react'; import { Map, Marker, TileLayer, GeoJSON } from 'react-leaflet'; import 'leaflet/dist/leaflet.css'; import { connect } from 'react-redux'; import './style.css'; import { setPoint, fetchData } from '../../actions/map'; @connect(store => { return { map: store.map } }) class MyMap extends Component { mapClick(e) { this.props.dispatch(setPoint(e.latlng
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