reactjs

问题 I have these increment and decrement buttons that will add or subtract. I will import the default values from props and then want to allow the user to make adjustments. So when I update the state (series) for the appropriate group it appears to update just fine... but the input value remains '14' in the HTML although I have it set to value={this.state[mppt_number].series} . Shouldn't it automatically update when the state changes? It probably has to do with the [mppt_number] variable.... if

问题 Closed. This question needs debugging details. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 8 months ago . Improve this question I'll be thankful if you can assist me on an issue with Clarifai API. I made a simple application of Face Detection using the API. I've followed the documentation and from my client I ran the following code snippet: app.models .predict(Clarifai.FACE_DETECT_MODEL, this.state.input

问题 I am using Firebase in a React web app and I need to use firebase.firestore.FieldValue.serverTimestamp() and some other methods. However to get a firebase reference I import import * as firebase from "firebase"; Doing this import gives me the following console warning: It looks like you're using the development build of the Firebase JS SDK. When deploying Firebase apps to production, it is advisable to only import the individual SDK components you intend to use. For the module builds, these

问题 I am making a custom textinput with different focus and normal colors, for this i am using withStyles function and i am overriding the control colors. below is the code const CustomTextInput = withStyles({ root: { '& label.Mui-focused': { color: "gray", }, '& .MuiInput-underline:after': { borderBottomColor: "#00ff00", }, '& .MuiInput-underline:before': { borderBottomColor: 'gray', }, }, })(TextField); export default function CustomTextInput(props) { ----- } But in above i have hard coded the

问题 My app has multiple pages labelled 'Red', 'Green', 'Blue' and 'Pink'. To allow the user to navigate between the pages, I use React Router (v5.2.0). The routes are wrapped in a TransitionGroup (v4.4.1) so that when the user navigates to a new page, a fade-in transition effect is applied to the page that makes it slowly fade into view. The duration of this transition is 5000ms. **Problem** The app initialises on page 'Red'. Say the user clicks on page 'Blue' and then on page 'Pink' while Blue's

问题 I have been trying to enable SSL on my MERN heroku-deployed app. I have been stuck at this step far more than necessary: I am following this tutorial to set-up SSL certificate on my website. After, generating the certificate using this command locally: sudo certbot certonly --manual I was asked to do this by the terminal: Create a file containing just this data: dC9Ry5Ps_qgkOheuWnxCXFobim8vshqMqbDC9FQS4ic.noFTXhkC3HFnZ-RC9djrM6FpWGRy2AFSB17xz59apDA And make it available on your web server at

问题 Creating a new React app in E:\rn-starter\my-app. Installing packages. This might take a couple of minutes. Installing react, react-dom, and react-scripts with cra-template... 'sh' is not recognized as an internal or external command, operable program or batch file. Aborting installation. npm install --save --save-exact --loglevel error react react-dom react-scripts cra-template has failed. Deleting generated file... package.json Deleting my-app/ from E:\rn-starter Done. This error pops-up

问题 I have been trying to enable SSL on my MERN heroku-deployed app. I have been stuck at this step far more than necessary: I am following this tutorial to set-up SSL certificate on my website. After, generating the certificate using this command locally: sudo certbot certonly --manual I was asked to do this by the terminal: Create a file containing just this data: dC9Ry5Ps_qgkOheuWnxCXFobim8vshqMqbDC9FQS4ic.noFTXhkC3HFnZ-RC9djrM6FpWGRy2AFSB17xz59apDA And make it available on your web server at

问题 My app has multiple pages labelled 'Red', 'Green', 'Blue' and 'Pink'. To allow the user to navigate between the pages, I use React Router (v5.2.0). The routes are wrapped in a TransitionGroup (v4.4.1) so that when the user navigates to a new page, a fade-in transition effect is applied to the page that makes it slowly fade into view. The duration of this transition is 5000ms. **Problem** The app initialises on page 'Red'. Say the user clicks on page 'Blue' and then on page 'Pink' while Blue's

问题 In the project with react Material Ui is used. The theme is being overriden, but the colors of buttons and inputs do not change. Here is the theme.js where Material Ui theme is created // @flow import { createMuiTheme } from '@material-ui/core'; import type { Theme, } from '@material-ui/core'; const theme: Theme = createMuiTheme({ palette: { primary: { main: '#ffa300', light: '#ffd449', dark: '#c67400', contrastText: '#000000', }, secondary: { main: '#ff8500', light: '#ffb644', dark: '#c55600