reactjs

问题 I am working of a Guessing Game for 'React Native' where the user enters a number and the phone tries to guess it. Each time the phone generates a guess the user can click Greater/Lower. When the user entered number and the computer made guess equal each other we are taken to the game over screen. The game over screen is not rendering. The logic to render the game over screen is placed inside of a useEffect() Problem useEffect is only fired once during the mounting phase and never again?

问题 What's the difference between 1 const [state, setState] = useState(0) setState(state+1) 2 const [state, setState] = useState(0) setState(...prevState => prevState+1) 回答1: In the first option, based on the documentation: The setState function is used to update the state. It accepts a new state value and enqueues a re-render of the component. In the second option, called functional update: If the new state is computed using the previous state, you can pass a function to setState . The function

问题 What's the difference between 1 const [state, setState] = useState(0) setState(state+1) 2 const [state, setState] = useState(0) setState(...prevState => prevState+1) 回答1: In the first option, based on the documentation: The setState function is used to update the state. It accepts a new state value and enqueues a re-render of the component. In the second option, called functional update: If the new state is computed using the previous state, you can pass a function to setState . The function

问题 I have the following GRAPHQL subscription: Schema.graphql type Subscription { booking: SubscriptionData } type SubscriptionData { booking: Booking! action: String } And this is the resolver subsrciption file Resolver/Subscription.js const Subscription = { booking: { subscribe(parent, args, { pubsub }, info) { return pubsub.asyncIterator("booking"); } } }; export default Subscription; Then I have the following code on the Mutation in question pubsub.publish("booking", { booking: { booking },

问题 I have two collections namely CURRENCY_PAIR and CURRENCY_PAIR_LIMIT . The CURRENCY_PAIR collection has the following fields in each document: CurrencyPair_Name CurrencyPair_id Currency_AskPrice Currency_BidPrice and the CURRENCY_PAIR_LIMIT collection contain the following fields in each document: Limit_id Limit_Buy_Price_Threshhold Limit_Sell_Price_Threshhold Limit_Currency_Pair_Id (references to the Currencypair_Id in the CURRENCY_PAIR collection) I wanted to map each CurrencyPair_Name to

问题 I am trying to construct react components in sublime text, but the syntax highlighting is suggesting that I didn't do everything properly. Where is wrong? 回答1: You are most likely using the Javascript syntax definition, which does not recognize inline HTML like this. To fix this, try the JSX.sublime-syntax definition from Sublime Text 4, which is in development now. To install it, copy the .sublime-syntax file from the above link to your Packages/User directory, where Packages is the one

问题 I am trying to call a webapi from react and I get this error responseJson = {Message: "An error has occurred.", ExceptionMessage: "Can't bind multiple parameters ('tenant' and 'certificateFile') to the request's content.", ExceptionType: "System.InvalidOperationException", StackTrace: " at System.Web.Http.Controllers.HttpActionBindin…tpControllerDispatcher.d__1.MoveNext()"} my react code is like this: import React, { Component } from 'react'; import { Row, Col } from 'antd'; import PageHeader

问题 I am trying to call a webapi from react and I get this error responseJson = {Message: "An error has occurred.", ExceptionMessage: "Can't bind multiple parameters ('tenant' and 'certificateFile') to the request's content.", ExceptionType: "System.InvalidOperationException", StackTrace: " at System.Web.Http.Controllers.HttpActionBindin…tpControllerDispatcher.d__1.MoveNext()"} my react code is like this: import React, { Component } from 'react'; import { Row, Col } from 'antd'; import PageHeader

问题 I followed https://zellwk.com/blog/publish-to-npm/ to create my custom npm package (https://www.npmjs.com/package/demo-to-publish). The folder structure of my custom package is as follows: src -> index.js node_modules List item Lable.js package.json webpack.config.js Content of my package.json is as follows: { "name": "demo-to-publish", "version": "1.0.5", "description": "testing publishing to npm", "main": "./src/index.js", "scripts": { "test": "echo \"Error: no test specified\" && exit 1",

问题 After migrating from material-ui v3 to v4, noticed the react component/function name in the class attribute inside the HTML. Is that expected? Might this somehow affect overriding class properties already noticing issues when trying to override with new styles which do not apply. Also is there a possibility to remove those? The component names are: WrapperComponent, withRouter, CustomerDetailsContainer among others. 回答1: Material-UI uses class name generator to generate unique class names for