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  • Questions tagged [reactjs]

    React (also known as React.js or ReactJS) is a JavaScript library for building user interfaces. It uses a declarative paradigm and aims to be both efficient and flexible.

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    get parse String inside .then() to outside as JSX element

    In react I import these following libraries import React from "react"; import { Container, Row, Col, Card, CardBody, CardFooter, Badge, Button } from "shards-react"; inside the ...
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    1answer
    13 views

    Syntax question in relation to updating state using setState in a for loop

    I am trying to update a state based on certain conditions that include values given to specific objects in an array. I have tried various syntax which gave me an error such as this.setState(this.state....
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    11 views

    How do I add a background image in React+bootstrap?

    I have been trying to add a background image to my webpage. This is how I am currently trying to do it but it doesn't seem to work. in my App.js file: import React from 'react'; import './App.css'; ...
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    45 views

    in react bind what does 'this' refer to?

    In the following example I'm trying to better understand the bind method. Specifically, what do the two instances of 'this' refer to and why do we need the second one? Also, why don't I need to ...
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    8 views

    layout component does not unmount on server side when children unmounted

    I use next.js. In my index route, according to "step" State, I render some component which has own Layout, when the last condition is true, "FormContainer" without any Layout suppose to render but it ...
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    10 views

    Types for static property of styled-components element

    How can I type a styled-component element that has a static property? interface IMyList { Item: ThemedStyledFunction<"li", any>; } const MyList: IMyList = styled.ul` padding: 0; margin: ...
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    24 views

    is react inconsistent when setting values?

    Confused as to why the first case works but the second case doesn't: this.state{hidden:true} case 1: return ( <div> <input type = 'checkbox' id = "boldCheckbox" hidden={this....
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    15 views

    React native typescript - buidling javascript bundle error

    I'm very new to react and i encountered this problem where i get this error message: but i can't seem to find what the problem means. From what i understand the problem lives in the MovieFocusCard ...
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    25 views

    Using React Router, how do I redirect to a route when there is a parameter in the URL?

    I have a React app using react-router-dom and I'd like to create a <Redirect /> in my top level App component if a condition is met. import { BrowserRouter, Redirect, Route } from 'react-router-...
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    17 views

    How Can I exec a function when user press a key on React using Hooks?

    I need that my react component exec a function when user press a key (keyUp), but i have the next error: react-dom.development.js:55 Uncaught Invariant Violation: Too many re-renders. React limits ...
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    10 views

    Material UI custom text field on date picker

    Alrighty, so I'm using Material UI on my react project and using their suggested Material UI Pickers for a date picker, now the thing is, for it to be in line with the rest of my fields, I'd like to ...
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    39 views

    How to render a component in React without putting it in a render() method?

    I am using Ant Design (antd) in my app, and it has a component called Modal. This Modal is rendered following the standard flow of React, that is, declaring a <Modal/> component on your render() ...
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    How to pass data from React Form -> Flask Backend -> React Component (does it have something to do with CORS)?

    Hi I am a complete React beginner and have a fairly basic question. I am looking to perform the following steps: (1) Provide user a form to input some text (2) Ingest the input into the Flask backend ...
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    1answer
    15 views

    How to remove selected value when click button of Autocomplete Material UI?

    I'm using autocomplete of material-ui, and trying to delete selected value whenever click a button but can not find any way to do that. Any idea? <Autocomplete className={...
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    Architectural design for consuming big volume of data from different data sources

    The current product implementation is: In the back end we are using spring- boot and for the front-end we have React\Redux app. Up until now, we were working with only one database (Oracle) with a ...
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    6 views

    React-native yarn workspaces/wml don't load imported modules that contains an installed package

    I tried to implement react-native with workspaces to share the business logic across mobile and web application, it works well on the web, but it doesn't work or even load files on react-native. I ...
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    1answer
    13 views

    Antd's getFieldDecorator for other packages

    I'd like to integrate react-mapbox-autocomplete with Antd's getFieldDecorator. But it seems to Antd's getFieldDecorator only support for their own components. Is there any way to use it for other ...
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    14 views

    Pulling data from 3° party API to my application with react

    I am trying to pull some data from an api to my app using a react component. I created the component as a function, wrote the code before the return statement, and used reactstrap to let app users ...
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    1answer
    26 views

    Pass props functional components react

    I am new to react and trying to pass props from one functional component to another. Here is component 1: import React from 'react' import TeamItem from './TeamItem' import KKR from '../../assets/...
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    1answer
    30 views

    Exporting functional component does not work

    I'm exporting my screen called Bus as a function instead of a react class component and always receive an error screen saying: 'Invariant Violation: Element type is invalid: expected a string( for ...
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    15 views

    Create-react-app doens't work on local network

    I can't access my server from any other device on the same network (only localhost works). I tried adding --host 0.0.0.0 option to the start script and also setting the following: devServer: { ...
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    1answer
    12 views

    Correctly positioning a Modal without restructuring code React

    I have a class InventoryView which displays a list of stock items and is defined as follows : class InventoryView extends Component { ... render() { ... { consumableItemsArray.map((...
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    1answer
    25 views

    How to get previous value of input in React?

    I have a component with input. Input have an initial value, originalValue which is set from props. Value of input also can be updated on change. But also there is a reset button, which should work ...
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    7 views

    Bulk action capabilities for react-admin's MuiGridList layout

    I am trying to add bulk action capabilities to <MuiGridList> component in react-admin 2.9.7. While rendering table like this: <List> <Datagrid> <TextField source="id" /&...
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    5answers
    32 views

    How do i make this button works

    well i have a function in a folder named auth that contain a auth.js file with this funtion logout() { // Clear Access Token and ID Token from local storage localStorage.removeItem('...
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    1answer
    20 views

    How to pass import as props parameters in React JS

    I use react-lotties and i want to put differents animations in many div changing only the url of lotties I am a react beginner, be kind please :) this is my script : My lotties Component : ...
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    2answers
    19 views

    How can I stop my React app from re-rendering when I change language?

    I have three pages: Home, About, Testimonials. When I navigate to About or Testimonials and change my language from English to Korean (한국어), the page briefly translates the English text to Korean ...
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    8 views

    Gatsby React key property error, despite key is there

    I have the following ul in react: (I know that using index is not always the best idea. Just for simplicity) <ul> {project.topics.map((topic, i) => <li key={i}>{topic}</...
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    1answer
    22 views

    React Typescript - Argument of type is not assignable to parameter of type

    I have a demo here It's a React app using Typescript and hooks to capture entries into form that are simple displayed below. Here in Stackblitz it works but locally I am using VS code and I get an ...
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    21 views

    Button click on a table Cell doesn't return the function value to only first row

    I am new to react and html, we are currently developing a front page where in user can key in some values and based on which REST API (basically a backend service) would return the result. We are ...
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    18 views

    How do I define type for router object which I need to pass to the function component in ReactJS?

    Trying to rewrite ReactJS's config based router example to be used with TypeScript and have an issue in defining an appropriate type. I have the following array of routes in file routes.ts: import ...
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    9 views

    How to convert postgres time format ( timestamp without timezone) to Date object(Sun Dec 01 2019 17:55:25 GMT+0530 (India Standard Time) in React?

    I need to save the timestamp I am getting from database as date object in react. Postgres format of date: timestamp without timezone. Required format: Sun Dec 01 2019 17:55:25 GMT+0530 (India ...
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    1answer
    22 views

    *Help* Convert class to functional component using hooks

    I'm trying to convert EditableTabGroup to a functional component Tags however I can't seem to convert it correctly as I'm trying to remove this. . EditableTabGroup is working correctly but when I ...
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    1answer
    27 views

    setupProxy is not working - http-proxy-middleware

    My react app is up on localhost:3000 and node server is running on localhost:5000. When I am trying to connect to the express API the route is going to 'localhost:3000/auth/google' instead of ...
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    10 views

    Amcharts control horizontal datepoint interval

    How I can stretch chart regarding the timeline like in the first picture? The chart is automatically applying uniform spacing to the yAxis. I need the datapoints to match up with the labels. const ...
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    0answers
    9 views

    how to convert base 64 image to object in react-avatar-editor

    npm packages used import AvatarEditor from "react-avatar-editor"; import Dropzone from "react-dropzone"; step-1 select image using dropzone <Dropzone onDrop={(acceptedFiles)=>...
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    26 views

    Close external Window in React

    I can not seem to close an external Window in React, I have the following HOC: export const WindowContext = createContext<IWindowContext | null>(null); export const WindowProvider: FC = ({ ...
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    18 views

    How can I find problem about my modules not found in react js

    The main problem is that every dependency I install isn't able as a module in my .js file when I want it to be included, so I can use it... I installed react-bootstrap-table-next library and can't use ...
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    0answers
    25 views

    Unable to import CSS module in a react app

    I'm trying to import import '@progress/kendo-theme-material/dist/all.css' but I get the following error: Error in ./~/@progress/kendo-theme-material/dist/all.css Module not found: Cannot resolve ...
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    2answers
    44 views

    Is Redux the same for React and React native?

    I am currently studying RN by myself, without prior knowledge in React. A lot of things seem to exist in both such as Redux and hooks. Many of the resources I find refer to React in the title (e.g "...
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    27 views

    ReactJS context api with axios async

    I'm trying to get data from api with axios (async) in app.js and create a context to access this data in other compontents. class App extends React.Component { constructor(props) { super(...
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    7 views

    multer/filepond upload returning undefined

    i am currently trying to integrate multiple filepond components/instances into my react app, where the images are uploaded on button/form submit. I have it more or less working with the code below, ...
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    0answers
    12 views

    Problem with log out function in a github tutorial

    i wanna be able to log out of my app, i'm following a github tutorial everything good until i found it was incomplete there was a log out function it says that i just have to do a callback the log ...
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    3answers
    31 views

    The “x-auth-token” header in Router.all() returns undefined

    I am currently building an application using React for frontend and Nodejs for backend powered by Express.js. I'm using jsonwebtoken for security method and applying a middleware called auth.js to ...
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    0answers
    14 views

    having Typescript error TS7053 within REACT

    i'm new to typescript and face an error: Element implicitly has an 'any' type because expression of type '"data-direction"' can't be used to index type 'Pick <DetailedHTMLProps<HTMLAttributes&...
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    0answers
    11 views

    TypeError: Invalid attempt to destructure non-iterable instance with CONTEXT API value state on reactjs

    Hi i try to make a simply state managment with context api and hooks on react js. I have a context named UIcontext and one component container called home. when i do the new instance of ...
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    7 views

    react app works at local. not works at hosting

    I am a junior. I am completed the test task of React. It works well locally. https://github.com/anvictor/railtex_user-reg_form But it does not work on hosting. http://webhelp.kiev.ua/railtex_user-...
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    24 views

    $(“<element>”) Equivalent in React Native

    So we can create elements by $("<element>") with jQuery and work with it without showing it on screen. Is there any way like in React Native? Create element, dont show it on screen and get ...
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    1answer
    25 views

    Issue with npm start and compiling in react

    so i have been assigned to maintain a react website. i am facing some problem with running the project.. npm start takes approx 4-5mins and likewise every changes saved takes upto 2-3mins(which is ...
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    1answer
    23 views

    Many components with the same reducer but different initial state

    I tested Redux with creating a little RPG game. I have a component called Monster who move on the map. The position, the direction and the spriteLocation are controlled by the store. The monster ...

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