reactjs

问题 I am currently using DatePicker Component of antd for displaying date but not able to customize the input format and display format. Eg: user would type the date as mmddyy (112119) format, datePicker should display date as 2019-11-21. Please find the sandbox link which I have tried by setting the value to datePicker but its getting overridden by format attribute https://codesandbox.io/s/wonderful-star-75qjq 回答1: Inspect the onOpenChange event and change the format prop can do this. class

问题 I have this code and tried to convert it to functional component and I am stuck. I have a form in return() part that passes the value to the state and then to props? via mapStateToProps as far as I understand... But, switching to function() component, I am lost what I have to do here. class Login extends Component { state = { login: '', password: '', keepLogged: false }; changeValue = event => { event.preventDefault(); const value = event.target.value; const name = event.target.name; this

问题 This is my parent component: import React from 'react'; import ChildModal from 'ChildModal'; const ParentComponent = () => ( <div> <span>Click </span> <a>HERE TO OPEN MODAL</a> <div> ); This is my child component: import React, { useState } from "react"; import { Modal, Backdrop, Fade } from "@material-ui/core"; const ChildModal = () => { const [open, setOpen] = useState(false); const handleOpen = () => { setOpen(true); }; const handleClose = () => { setOpen(false); }; return ( <div> <button

问题 This is my parent component: import React from 'react'; import ChildModal from 'ChildModal'; const ParentComponent = () => ( <div> <span>Click </span> <a>HERE TO OPEN MODAL</a> <div> ); This is my child component: import React, { useState } from "react"; import { Modal, Backdrop, Fade } from "@material-ui/core"; const ChildModal = () => { const [open, setOpen] = useState(false); const handleOpen = () => { setOpen(true); }; const handleClose = () => { setOpen(false); }; return ( <div> <button

问题 Could you please tell me How to make generic function for validation which return error messages? Here is my code https://codesandbox.io/s/react-hook-form-get-started-j39p0 helperText={ (errors.firstName && errors.firstName.type === "required" && "First name is required") || (errors.firstName && errors.firstName.type === "pattern" && "Invalid user") } instead of above line i want to create a function which return error message ( depending on type ) example it is type of required it shows me

问题 I have a file on my server (Node.js + Express). I need to download file from server to computer of user. in React app I call the function which would download file: downloadFileFromServer(file) { // file -- name of file fetch(`${Config.baseUrl}/download-file/${this.props.params.idEvent}/${file}`, { method: 'GET' }) .then((response) => { if (response.status >= 400) { throw new Error('Bad response from server'); } return response; }); } On backend I have this route: app.route('/download-file/

问题 I am interested in best way to present a React Material-UI with icon and text, so it is all vertically aligned. Right now it does not work as expected, especially with conditional rendering. <Typography gutterBottom variant="subtitle2" component="h2" align="center"> <Grid container direction="row" alignItems="center" wrap="nowrap"> {p.numRooms > 0 && ( <Grid item xs={2} alignItems="center"> <HotelRoundedIcon color="secondary" /> {p.numRooms} </Grid> )} {p.area > 0 && ( <Grid item xs={2}>

问题 I am doing some tiny stuffs in reactjs in a blade file of laravel. I just add react cdn and writing code within script tag. All looks good except I stuck at a point of showing image from public/assets/img folder of laravel using reactjs. Any help is appretiated. Thanks 回答1: You need to use the source link of your image. For example, if laravel expose those static files under http://localhost/public/asset/img , then you need to write in your JSX: <img src="http://localhost/public/asset/img

问题 I'm trying to find the best way to implement authorization. At this time, only thing I need is a simple free account, but later I may include user roles for a "premium" account using a payment system like stripe. I have already started reading and experimenting with Auth0 but then found some other ways I can do it. Passport.js + MongoDB, I've seen some examples and work great but I think it is missing a way to control users, rules etc with a friendly panel (like Auth0) Using Auth0 and setting

问题 I am working on a React project in that project I have a form, In that form I am trying to do Validation for an email address, but I don't know how to apply all these. What I am expecting is, In input tag if I type mark, then If I go to another Input tag it has to Show me some kind of message above Input tag like this, please enter a valid email address. This is Form.js import React from 'react'; import './Form.css'; const Form = () => { const validation = (email) => { const result = /^(([^<>