redux

Firebase child_added for new items only

由 北城以北 提交于 2019-12-18 03:05:31
问题 I am using Firebase and Node with Redux. I am loading all objects from a key as follows. firebaseDb.child('invites').on('child_added', snapshot => { }) The idea behind this method is that we get a payload from the database and only use one action to updated my local data stores via the Reducers. Next, I need to listen for any NEW or UPDATED children of the key invite. The problem now, however, is that the child_added event triggers for all existing keys, as well as newly added ones. I do not

React-Router: how to wait for an async action before route transition

由 ▼魔方 西西 提交于 2019-12-18 02:47:57
问题 Is it possible to call an async redux action known as a thunk on a particular route and not perform the transition until the response has succeeded or failed? Use Case We need to load data from the server and fill a form with initial values. These initial values don't exist until the data is fetched from the server. some syntax like this would be great: <Route path="/myForm" component={App} async={dispatch(loadInitialFormValues(formId))}> 回答1: To answer the original question of preventing the

Redux Form: How to handle multiple buttons?

由 蓝咒 提交于 2019-12-18 02:09:08
问题 I am trying to add a second submit button to a redux-form. Both buttons should dispatch an action that saves the data but depending on the button pressed the user should be routed to different pages. So I defined a handler that I pass as onSubmit prop to the form. But as far as I can see only the form data is passed to this handler: The docs on handleSubmit note: A function meant to be passed to <form onSubmit={handleSubmit}> or to <button onClick={handleSubmit}> . It will run validation,

redux和react-redux小记

由 本秂侑毒 提交于 2019-12-18 01:09:25
一开始接触 redux 时对于它的数据 state 和 react 本身的数据 state 还有点容易打结（它们是完全不同的两个东西，后面会讲到）现在搞清楚一点了，来小结一下。 在此之前，还是先讲一下redux是干嘛的，也就是说它是解决什么需求的，这里举一个小例子。 先来看看React里面的数据是怎样传递的（ 下图中并不是说 this.state 只能在“团长”处，这里只是为了简便，所以才这样写，其实营长，连长都可以有自己的this.state ）： React数据流： 1. 可以看到，一般都是团长等高级干部商量好对策之后（ this.state 设置好） 2 . 把命令一层层的传递下去执行（ this.props 渲染） 3 . 要是哪里发生了什么新的敌情了（想更新页面内容了） 4 .就得一层层往上报告（通过回调一层层把数据传上去），此过程也必须一层层往上传递，不能越级，下面有解释 5 . 团长做出决断后再发布命令传下去执行（通过 setState 修改数据并重新渲染） 这个过程是不能越级的 ，比如说你一连长发现了敌情就不能直接报告团长，而必须先报告给一营长，一营长再报告给团长，这里层级还不是特别深，你再来个排长，班长什么的，按照这种模式，等团长知道敌情，敌人都打到家门口啦，又或者说一连长想找三连长喝个酒，还得先把这个消息传给营长，再传给团长，再传给二营长再传给三连长，这……

how to get onUploadProgress in axios?

由 不想你离开。 提交于 2019-12-17 23:37:31
问题 I am little bit confused that how to upload progress evt with axios.Actually I am storing huge number files into aws s3.For that how to get uploaded progress I need this function onUploadProgress Currently my Post request is like this export function uploadtoCdnAndSaveToDb(data) { return dispatch => { dispatch(showUnderLoader(true)); return axios.post('/posttodb',{data:data}, ).then((response) => { console.log(response.data) }) } } 回答1: The Axios repository has a clear example on how to do

How to set activeClassName for wrapper element of Link or IndexLink in react-router?

由 ◇◆丶佛笑我妖孽 提交于 2019-12-17 23:21:36
问题 I am new to the ReactJS world, and would like to know how can I pass active class name to the <li> element instead of <a>(Link) element. Now I have this kind of code. The anchor class changes when clicked. <li><IndexLink to='/' activeclassName='active'>A</IndexLink></li> <li><Link to='/b' activeclassName='active'>B</Link></li> <li><Link to='/c' activeclassName='active'>C</Link></li> But I would like to get something similar to: <li activeclassName='active'><IndexLink to='/'>A</IndexLink></li>

Redux-Form initial values from

由 浪子不回头ぞ 提交于 2019-12-17 22:56:09
问题 I'm trying to fill the profile form with data from API. Unfortunately redux-form doesn't want to cooperate with me in this case. For some reason fields stays empty whatever I do. Setting the fixed values instead of values passed from reducer work well for some reason. Maybe this is because I'm using redux-promise for API calls inside the action creators? How can I live with it and get rid of this. Here is my form component. import React, { Component } from 'react'; import { reduxForm, Field }

How to update a value of a nested object in a reducer?

由 无人久伴 提交于 2019-12-17 22:23:44
问题 I have built my state like so const list = { categories: { Professional: { active: false, names: [ { id: 1, name: "Golf", active: false }, { id: 2, name: "Ultimate Frisbee", active: false } ] }} In my action I have added an ID option so I would like to change the active status when the user clicks the option to do so I am using Immutable JS though not married to it. I am wondering how I could target the id of the object and update its active status in a reducer? I am also open to feedback on

Redux: what is the correct way to filter a data array in reducer?

由 霸气de小男生 提交于 2019-12-17 21:55:27
问题 i want to filter an array on search SEARCH_TEXT is an on change action what I'm confused with is how i return the state when the delete key is pressed and the text now becomes empty, i figure i could use initial state in the else statement but my inclination is this is wrong? when i return just state it has all ready been manipulated in the if statement. simple example. thanks in advance. const initialState = ['hello', 'wahhh', 'yo']; export default function searchSimple(state = initialState,

React-Redux complex (deep) state objects

由 ぃ、小莉子 提交于 2019-12-17 21:53:20
问题 Given my initial redux state is : const state = { currentView: 'ROOMS_VIEW', navbarLinks: List([ {name: 'Rooms', key: 'ROOMS_VIEW'}, {name: 'Dev', key: ''} ]), roomListsSelected: {group: 0, item: 0}, roomLists: [ { name: "Filters", expanded: true, listItems: [ { icon: 'images/icon-warning.svg', name: 'Alerts', filter: room => room.hasAlert }, { icon: 'images/icon-playlist.svg', name: 'In Progress', filter: room => room.progress > 20 }, { icon: 'images/icon-playlist.svg', name: 'Almost Done',
订阅 redux