reactjs

问题 I have recently learned how to set up a simple api in my express server using a localhost mySQL database I have running on a MAMP server. After I set that up I learned how to have React.js fetch that data and display it. Now I want to do the reverse and post data from a form I created in React.js. I would like to continue using the fetch API to post that data. You can view my code below. Below is my express server code for my api. app.get('/api/listitems', (req, res) => { connection.connect()

问题 I am trying to add a custom claims, isRegistered to firebase. My firestore has another user collection to keep register info records. Now I am trying to keep a isRegistered custom claim but I can not seem to get it work. exports.addRegisteredRole = functions.database.ref('/user') .onCreate((snap, context) => { return // **I added this later, but the issue still remains.** admin.auth() .setCustomUserClaims(context.auth.uid, {isRegistered: true}) .then(() => { console.log('done', snap) return {

问题 Are there any side effects of doing a deep copy of state on the appReducer in a Redux application each time a reducer function is called? I'm asking because the Immutable Update Pattern docs for Redux state that to update a nested object on state, you should shallow copy the nested property and update it. I'm curious what the side effects would be for just doing a deep copy on state on every action call. Here is some pseudo code for example export default function appReducer(state =

问题 I've tried by acquiring the quill object like this: got the ref from ReactQuill Component <ReactQuill ref={this.setRef}/> and then in componentDidMount got the quill object itself this.quillRef= this.reactQuillRef.getEditor(); and then I call this.quillRef.history.undo() / this.quillRef.history.redo() But there seems to be a problem with focus, kinda like ReactQuill and Quill are out of sync. When i do undo or redo sometimes it just moves the cursor. But everything works fine on ctrl + z and

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 1 year ago . Improve this question We have this web app that is built using create-react-app and was deployed. Now we get this error in our console. Uncaught SyntaxError: Unexpected token '<' Most of the answers on StackOverflow speaks of webpack and all. We aren't using a webpack. What can be the reason for this?

问题 I've tried by acquiring the quill object like this: got the ref from ReactQuill Component <ReactQuill ref={this.setRef}/> and then in componentDidMount got the quill object itself this.quillRef= this.reactQuillRef.getEditor(); and then I call this.quillRef.history.undo() / this.quillRef.history.redo() But there seems to be a problem with focus, kinda like ReactQuill and Quill are out of sync. When i do undo or redo sometimes it just moves the cursor. But everything works fine on ctrl + z and

问题 I am trying to acheive the clipped under the app bar style temporary drawer. But I can't seem to be able to set the z index on the temporary drawer. The temporary drawer in material-ui has the z-index of the modal component which is 1300 as mentioned in the issue I raised here https://github.com/mui-org/material-ui/issues/22562. So, if I use the approach given in the documentation of setting the appbar zIndex to theme.zIndex.modal + 1 , I can get the 'clipped under the app bar` effect. But

问题 I'm quite new to react and I'm facing a problem I can't solve. Here is my react component: import React from 'react'; import Header from './Header'; import ContestPreview from './ContestPreview'; class App extends React.Component { state = { pageHeader: 'Naming Contests', whatever: 'test' }; render() { return ( <div className="App"> <Header message={this.state.pageHeader} /> <div> {this.props.contests.map(contest => <ContestPreview key={contest.id} {...contest} /> )} </div> </div> ); } }

问题 I just started to learn React and I am trying to figure out how to find a specific value I am looking for. Just like you have the each.do method in Ruby and you can iterate through an array, I'm trying to do that with React. class Gallery extends React.Component { render () { // debugger; return ( <div> <img> {this.props.gallery.thumbnail_url} </img> </div> ) } } I am trying to access the thumbnail._url and when using the debugger, I am not able to access all the objects and images. I thought

问题 I just started to learn React and I am trying to figure out how to find a specific value I am looking for. Just like you have the each.do method in Ruby and you can iterate through an array, I'm trying to do that with React. class Gallery extends React.Component { render () { // debugger; return ( <div> <img> {this.props.gallery.thumbnail_url} </img> </div> ) } } I am trying to access the thumbnail._url and when using the debugger, I am not able to access all the objects and images. I thought