redux

问题 I'm having issues adding a property when I create a new Redux Store in Typescript: const bindMiddleware = middleware => { if (process.env.NODE_ENV !== 'production') { const { composeWithDevTools } = require('redux-devtools-extension') return composeWithDevTools(applyMiddleware(...middleware)) } return applyMiddleware(...middleware) } function configureStore (initialState = exampleInitialState) { const sagaMiddleware = createSagaMiddleware() const store = createStore( rootReducer, initialState

问题 I'm using react-redux, and I'm trying to clear part of my redux state when a component unmounts, this actually does work, but the problem is that once userProfile is cleared and next component mounts it is unmounted and then mounted again. useEffect(() => { getProfileByUsername(match.params.username, user && user.id); return () => clearUserProfile(); }, [match.params.username]) I can see my clear action is being called before any mount of the next component occurs, but the data is not cleared

问题 For a learning and test project, I'm trying to return immutable redux data from reducer because safe data for component. this is my reducer code : function itemsReducer(state = [], action) { switch(action.type) { case 'ITEMS': return [...action.data] default: return state } } And this is my loop code : <ul> { this.props.items.map((item) => ( <li>{item.name.first} {item.name.last}</li> )) } </ul> now every things work right, but after change on props with this method : change() { this.props

问题 I have a functional component in which I want to save the data in my inputs form sending them with saveForm method to my java API. How can I read the response of this promise props.saveForm (in order to look for potentials server errors) in a functional component ? I've read that in these cases it must be used useEffect hooks..but If I move my handleSubmitForm() inside useEffect than I can't call it when the onSubmit event is thrown. Please enlight me. Thank you for your wisdom. Code I found

问题 I have a functional component in which I want to save the data in my inputs form sending them with saveForm method to my java API. How can I read the response of this promise props.saveForm (in order to look for potentials server errors) in a functional component ? I've read that in these cases it must be used useEffect hooks..but If I move my handleSubmitForm() inside useEffect than I can't call it when the onSubmit event is thrown. Please enlight me. Thank you for your wisdom. Code I found

问题 well, I have this reducer which has 2 actions: add an item and remove the item. add item work fine but the problem is with remove item, when I use filter method it will remove all items with the same name(duplicate), but I want to remove only the clicked element. I tried to use splice method by passing the item index as payload instead of a name, creating new array same as basket items and applying splice method to this array but the problem is when I assign the new array to basket items it

问题 I use the firebase cloud for DB. Here is the link from Github Repo. (It's Gmail Clone) https://github.com/Pijano97/gmail-clone You can check all files on Github, but most important are : EmailList.js EmailRow.js Sidebar.js sectionSlicer.js Store.js If you need to see how the site looks like here it is. https://clone-3857a.web.app/ I do not know why it renders "emails" (all emails) instead of starred(when I am on the starred section and try to remove star). When I remove the star it should

问题 I worked with ReactJS and flux. They are to used to build web based applications. And flux is used to enhance the way to data flow providing bidirectional data flow. I start learning react native and wants to know ─ Can I use flux into react-native ? OR ─ Is there any other libraries or framework available to use in react native. I came across Redux. Is that only option in react native ? Please help me to clarify what to use in react native. 回答1: Yes, you can use Flux in your react native app

问题 I followed the tutorial, however, am getting the console error: " Error : Expected the reducer to be a function " Here is my ( relevant ) configuration: WEBPACK.CONFIG.JS: ... const TARGET = process.env.npm_lifecycle_event; process.env.BABEL_ENV = TARGET; ... if( TARGET === "start" || !TARGET ) { module.exports = merge( common, { devtool : "inline-source-map", devServer : { contentBase : PATHS.build, hot : true, progress : true, stats : "errors-only" }, plugins : [ new webpack

问题 I followed the tutorial, however, am getting the console error: " Error : Expected the reducer to be a function " Here is my ( relevant ) configuration: WEBPACK.CONFIG.JS: ... const TARGET = process.env.npm_lifecycle_event; process.env.BABEL_ENV = TARGET; ... if( TARGET === "start" || !TARGET ) { module.exports = merge( common, { devtool : "inline-source-map", devServer : { contentBase : PATHS.build, hot : true, progress : true, stats : "errors-only" }, plugins : [ new webpack