redux

Session Storage not being retrieved on mobile browser

由 丶灬走出姿态 提交于 2020-02-06 07:30:10
问题 I have a create-react-app and I'm storage some state inside of sessionStorage to persist some redux state during the user's session. Everything works fine in Desktop browsers but while debugging on a mobile device inside of Safari or Chrome the state isn't be retrieved on refresh. This causes errors since the state is no longer there. Any idea why this would only happen on a mobile browser? This is how I'm saving and retrieving the state with sessionStorage: export function saveToLocalStorage

first time getting undefined props from mapStateToProps

由 被刻印的时光 ゝ 提交于 2020-02-06 07:24:05
问题 how can i get asynchronous reducers data ,i search but didn't get solution Booking component cutPick = () => { this.props.pickup(false); } action creator export function pickup(latlng) { return function (dispatch) { dispatch({type:PICKUP_STATE,payload:latlng}); } } reducer import {PICKUP_STATE} from '../actions/types'; export default function (state={},action) { switch(action.type) { case PICKUP_STATE: return {...state,pickup:action.payload} } return state; } Map component import React from

Redux store does not create

由 ☆樱花仙子☆ 提交于 2020-02-06 06:40:27
问题 src/components/reducers/index.js import {combineReducers} from 'redux'; const tasksReducer =(state=[] , action)=>{ switch(action.type){ case 'ADD_TASK': state=state.concat(action.payload); break; case 'DELETE_TASK': state=state.slice(); state.splice(action.payload,1); break; } return state; }, reducers=combineReducers({ tasks:tasksReducer }); export default reducers; (mapStateToProps() in Connect(Taskbar) must return a plain object. Instead received undefined.) 回答1: src/index.js here's how I

Testing React component onClick event with multiple actions in it

由 巧了我就是萌 提交于 2020-02-06 05:16:15
问题 Can't figure it out how to test onClick function with multiple actions in it. onButtonClick = function(action){ this.props.otherAction(); action(); } ... <Button bsStyle="success" bsSize="small" onClick={onButtonClick.bind(this,someAction}> Something </Button> And the test I currently have is like this. const onButtonClick = function (action) { actions.otherAction(); action(); }; it('Should include a button with multiple actions on onClick event.', function () { const button =

Flutter: redux简单使用

由 我的未来我决定 提交于 2020-02-05 05:21:08
Pub redux flutter_redux import 'package:flutter/material.dart'; import 'package:redux/redux.dart'; import 'package:flutter_redux/flutter_redux.dart'; // 一个简单的动作：增量 enum Actions { Increment } void main() { // reducer + initState = store final store = Store<int>((int state, dynamic action) { if (action == Actions.Increment) { return state + 1; } return state; }, initialState: 0); runApp(new MyApp(store: store)); } class MyApp extends StatelessWidget { MyApp({Key key, this.store}) : super(key: key); final Store<int> store; @override Widget build(BuildContext context) { return StoreProvider<int>(

How to write a Redux Saga Test by mocking selectors and / or redux store

由 女生的网名这么多〃 提交于 2020-02-05 04:08:05
问题 Context: I'm brand new to writing Redux Saga tests and have been using the React Boilerplate to develop an app, which uses Jest for testing. The boilerplate is extremely modular and complex and I am having trouble figuring out how to even begin writing a test to mock selectors and state for my Saga to use within the test. In the Saga, I'm using Reselect (within the './selectors' file) to grab the 'Username' and "Password' from the reducer, assign them to a constant using yield select , and

react入门

由 天涯浪子 提交于 2020-02-05 03:10:49
react入门 react 入门 前端 用vue做了一些项目后，有一些疑惑的地方。学习下react对比一下，加深自己对前端框架的了解。学习的时候发现 大多网上的教程都不是最新的，例如：react router v4的react-router-dom。所以最好还是到官网上面去看，英文虽然有的看不懂，但是看懂示例代码就行了。react作为目前端最火热的框架，理应学习和掌握。 react技术栈预览 推荐看下 阮一峰的React 技术栈系列教程 ，有的写的比较老，可以大致过下概念，有个大致了解，然后去官网看具体写法 1. react react官网 gitbook-react gitbook入门 2. react-router,路由 react-router gitbook(老) react-router(新) 3. Redux状态管理 redux中文文档 Redux是一个JavaScript app的可预测state容器。 如果你觉得需要Flux或者相似的解决方案，你应该了解一下redux，并学习Dan Abramov的redux入门指南，来强化你的开发技能。 Rudux发展了Flux的思想，同时降低了其复杂度。 4. Flux 阮一峰Flux 架构入门教程 Flux gitbook Flux 是一种应用架构，或者说是一种思想，它跟 React 本身没什么关系，它可以用在 React 上

“Error: Cannot find module 'internal/util/types'” while installing node packages in a react-redux project

由 可紊 提交于 2020-02-04 06:21:21
问题 I am learning Redux and am running into this error anytime I try to install a node package during my initial project setup: `Error: Cannot find module 'internal/util/types' at Function.Module._resolveFilename (module.js:547:15) at Function.Module._load (module.js:474:25) at Module.require (module.js:596:17) at require (internal/module.js:11:18) at evalmachine.<anonymous>:31:26 at Object.<anonymous> (/usr/local/lib/node_modules/npm/node_modules/graceful-fs/fs.js:11:1) at Module._compile

change to new value of state using mapDispatchToProps

由 谁都会走 提交于 2020-02-04 03:37:29
问题 Profile.js The Profile screen fetches its data from the WebApi using redux and displayes the Image according to the imageUrl. The SelectImage() calls a function for users to open up the gallery and choose a new image. After choosing the Image, I would like the image to be shown on the screen and replace current value of this.props.items.imageUrl . I just started redux and implemented it to my application. I would like to update the state of redux and be accessed on other screens as well, as

change to new value of state using mapDispatchToProps

由 僤鯓⒐⒋嵵緔 提交于 2020-02-04 03:35:20
问题 Profile.js The Profile screen fetches its data from the WebApi using redux and displayes the Image according to the imageUrl. The SelectImage() calls a function for users to open up the gallery and choose a new image. After choosing the Image, I would like the image to be shown on the screen and replace current value of this.props.items.imageUrl . I just started redux and implemented it to my application. I would like to update the state of redux and be accessed on other screens as well, as
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