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Trying to populate 16 random images using Math.random and a filter ``import React from 'react' import { getCard } from '../redux' import { connect } from 'react-redux' import CardBoard from './CardBoard' class Board extends React.Component{ componentDidMount(){ this.props.getCard() } render(){ let gameCard = Math.floor(Math.random() * (54 - 2) +2); const game = () => { let cards = ; if(cards.length < 16) { cards.push(gameCard); } return cards; }; return( {this.props.cards .filter(one => one.number === gameCard) .map(card => ( ))} ); } } export default connect(state => state, { getCard })(Board)`` Welcome to stackoverflow B L! There is not quite enough information in your q...

reloading a web page and placing page at same place where user was at Is there a way in react or javascript to after reloading a page make that page to be at the same place where the user was looking at? So far, location.reload reloads the page but places that page at its beginning. 3 Answers 3 Add additional true parameter to force reload. document.location.reload(true) document.location.reload() stores the position, document.location.reload() ordinary reload tries to restore the scroll position after reloading the page, while in forced mode (when parameter is set to true) the new DOM gets loaded with scrollTop == 0. Reference : https://developer.mozilla.org/en-US/docs/Web/API/Location/reload My web page is defined by react components and the html page has only with an id tag. It seems this method does not work under these circumstances. – Jose Cab...

SyntaxError: Unexpected token ' { ' while starting the reactjs app in my terminal [duplicate] This question already has an answer here: I tried to run existing clone reactjs app, the following error is accured in terminal, SyntaxError: Unexpected token { at exports.runInThisContext (vm.js:53:16) at Module._compile (module.js:374:25) at Object.Module._extensions..js (module.js:417:10) at Module.load (module.js:344:32) at Function.Module._load (module.js:301:12) at Function.Module.runMain (module.js:442:10) at startup (node.js:136:18) at node.js:966:3 Here my start.js coding from (myappname)/node_modules/react-scripts/scripts/start.js:31 start.js (myappname)/node_modules/react-scripts/scripts/start.js:31 const { choosePort, createCompiler, prepareProxy, prepareUrls, } = require('react-dev-utils/WebpackDevServerUtils'); Then how to solve this problem? This question has been asked before and already has an answer. If those answers do not fully addre...

Wrapping Provider in same component throws Element type is invalid: expected a string (for built-in components) or a class/function but got: object I wrote a simple counter example in both Mobx & Redux & it works Full demo is available https://codesandbox.io/s/nw303w6jxl But if I remove Provider from ./src/index.js Provider ./src/index.js const App = () => ( ); & put it in ./src/redux.js while default exporting it throws an error ./src/redux.js export default ( <Provider store={store}> <ConnectReduxApp /> </Provider> ); Uncaught Error: Invariant Violation: Element type is invalid: expected a string (for built-in components) or a class/function but got: object Its working but I don't know why its happening? I checked the typeof the default exported function from ./src/redux.js ,i.e, typeof ./src/redux.js console.log( typeof( <Provider store={store}> <ConnectReduxApp /> ...

Stop click on child calling method on parent - React/JavaScript I have a modal in React. When you click the background of the modal, the modal should close. The way I have it set up right now, if you click inside* the modal, it closes as well. Because the modal is inside the background> handleClose(e) { e.stopPropagation(); this.props.history.push('/business/dashboard') } render() { return ( <Background onClick={e => this.handleClose(e)} name="BACKGROUND"> <Container onClick={console.log("IT CLICKED")} to={'/business/dashboard'} name="CONTAINER"> .... When I click on Container, the onClick event for Background gets called. I don't want this to happen. This is a form that users will be clicking on all the time. I need the modal to only close when you click outside the modal on Background. while you could use something like npmjs.com/package/react-onc...

React-select shows keyboard when is toggled i'm using react-select ^1.2.1 and i'm facing a weird behaviour. When i toggle the dropdown in mobile view keyboard is opening like the screenshot My component inside is this: render() { return ( + - </div> Any suggestions? Maybe the input tag?? 1 Answer 1 I think you should add the attribute "readonly" on your input to avoid the default behavior on this element. <input id={this.props.id} type="number" name={this.props.input.name} value={this.props.currentTravelersNumber} className="person-selector" readonly /> By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of th...

create-react-app: using non-npm dependencies / libraries I'm using Create React App and I would like to use a JS library that isn't available via npm. How would I go about integrating that into my app? I think I can simply add a script tag for it in public/index.html for development purposes but I'm guessing that won't include it in the final build code. Any suggestions would be welcome. public/index.html 1 Answer 1 You can add your script to the public folder and include it in the public/index.html file. public public/index.html http://%PUBLIC_URL%/my-script.js That appears to work - thanks! However, does that mean when I run npm run build , that this non-npm library will be included in my production ready code? – Bill Jun 29 at 21:44 ...

React props are being evaluated even if the component is still suppose to be rendered I have a wrapper for my components that tells them not to render until they are done loading that looks like this import React from 'react'; import LoadingSpinner from 'vivid.react.components/atoms/LoadingSpinner'; class Wrapper extends React.Component { componentDidMount() { this.props.getInitialState(); } render() { const { error, isLoadingInitialState } = this.props; return ( {!!error && Error: {error.message} } {isLoadingInitialState ? <LoadingSpinner/> : children } </div> ) } }; export default Wrapper; However, when I used this wrapper inside a Context Consumer, the props of the children are still being evaluated even if the LoadingInitialState is true and the children is not supposed to render. const S...

Nested TabNavigator inside StackNavigator: controlling the header I have a setup much like this: let Tabs = createBottomTabNavigator({ screen1: Screen1, screen2: Screen2 }) let Stack = createStackNavigator({ tabs: Tabs otherScreen: OtherScreen }) The stack navigator has a header, and that's fine. What I want is to get different header icons depending on what tab I'm currently on. I'm using the following versions: "react": "16.3.1", "react-native": "~0.55.2", "react-navigation": "^2.2.5" I've considered switching up my setup so that each tab screen has its own StackNavigator but I like having the sliding animation when switching tabs and I don't want the header icons to slide along. The header bar should remain static but simply show different icons depending on the current tab. StackNavigator This question has not received enough attention. 4 Answers ...

React Native display simple Json Data I am trying to create a simple page, in which I want to display the data i get from the Json file. Unfortunately I get "Invariant Violation: Objects are not valid as a React child (found: object with keys {ts, trend, baro, temp, hum, wind, rain, et, forecast, sun}). If you meant to render a collection of children, use an array instead." So it loads the Json but I cant display the data. If tried various methods, but couldnt solve it. App.js import React from 'react' import { AppRegistry, StyleSheet, FlatList, Text, View, Alert, ActivityIndicator, Platform} from 'react-native' export default class Planner extends React.Component { constructor(props) { super(props); this.state = { isLoading: true } } componentDidMount() { return fetch('url') .then((response) => response.json()) .then((responseJson) => { this.setState({ isLoading: false, ...

favicon to react application doesn't work i want to add favicon to my react application but doesn't seem to work. Tried the below: add the code to index.html file in the head section <link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png"> <link rel="icon" type="image/png" sizes="32x32" href="/favicon-32x32.png"> <link rel="icon" type="image/png" sizes="16x16" href="/favicon-16x16.png"> <link rel="manifest" href="/site.webmanifest"> <link rel="mask-icon" href="/safari-pinned-tab.svg" color="#5bbad5"> <meta name="msapplication-TileColor" content="#ffc40d"> <meta name="theme-color" content="#ffffff"> Also placed the icons in the same folder as index.html. Could you please let me know where the problem persists.thanks. ...

Redux action is working but reducer is not Not sure why my reducer is not working. I have a console.log in my actions file. So for example, when I test out a failed login attempt, I see the console log in both the loginFromAPI function and loginFailure function (see in actions.js below) . These are outputting what is expected. But for some reason, the login reducer is not working. When I console.log in the loginReducer.js , I see nothing. This tells me that although the action is working, the reducer is not. My redux props do not change from the initial state (I've checked this by outputting to the console). I'd appreciate any help solving this issue. Here is the file structure: app reducers loginReducer.js rootReducer.js screens Login Login.js index.js actions.js store configureStore.js App.js actionTypes.js File configureStore.js configureStore.js import { createStore, applyMiddleware } from 'redux'; import a...

React populating a dropdown from an input field I have a simple React app that allows you to create multiple "story" components when you click a button. Each "story" has two components - an input field (to edit the story title) and a dropdown list (showing all other story titles). I’m trying to get the story dropdown list to populate with all the story titles (at the moment they are hard coded to a state array called storyOptions). The end idea is - User creates new story > user updates story title > user chooses another story to link to from the dropdown (dropdown shows the titles of all the other stories). My current code is below... class App extends Component { constructor(props) { super(props); this.storyList = ; this.state = {storys: this.storyList}; } addNewStory(e) { this.storyList.push({ id: this.storyList.length, title:"Type your story title here", }); this.setState({storys: this.storyList}); } ...

react js Date-picker(react js date-picker set year range in year drop down list ) how to disable the past years in year drop down list in react date picker? the problem is when we click the drop down list it shows past years as well as future year.I want show the current and future years enter image description here This may be relevant stackoverflow.com/questions/41323221/… – Sterling Archer Jun 29 at 17:23 The code did not disable the years in year drop down but it disable the dates – Abishek Jun 29 at 17:33 1 Answer 1 You can pass the prop minDate to the DatePicker component, and set it to the start of t...

Warning: setState(…): Can only update a mounted or mounting component on a new reactjs app I have the following component: import React, { Component } from 'react'; import { Row, Col } from 'antd'; import PageHeader from '../../components/utility/pageHeader'; import Box from '../../components/utility/box'; import LayoutWrapper from '../../components/utility/layoutWrapper.js'; import ContentHolder from '../../components/utility/contentHolder'; import basicStyle from '../../settings/basicStyle'; import IntlMessages from '../../components/utility/intlMessages'; import { adalApiFetch } from '../../adalConfig'; export default class extends Component { constructor(props) { super(props); this.state = { data: }; this.fetchData(); } getValues() { adalApiFetch(fetch, '/values', {}) .then((response) => { // This is where you deal with your API response. In this case, ...

Native Base two headers I have created the header with title and right icon by using native base. However, there are two headers showing on my simulator. I have no idea what is going on. Can someone help me with this? import React, { Component }from 'react'; import { StyleSheet } from 'react-native'; import { Icon, Button, Container, Header, Content, Left, Right, Body,Text, Title } from 'native-base'; class Landing extends Component { render() { return ( <Container> <Header> <Left /> <Body> <Title> Title </Title> </Body> <Right> <Button transparent> <Icon name="ios-menu" onPress={() => this.props.navigation.navigate('DrawerOpen')} /> </ Button> ...

Typescript image import I found a solution here: Webpack & Typescript image import But i am getting error for this: [ts] Types of property 'src' are incompatible. Type 'typeof import(" .png")' is not assignable to type 'string | undefined'. Type 'typeof import(" .png")' is not assignable to type 'string'. I guess i need to cast import somehow, but cant figure out how. I am doing this in React. I saw that src attribute is defined as string | undefined , that is why error is popping. src string | undefined Here is code: import * as Logo from 'assets/images/logo.png'; HTML: <img src={Logo} alt="" /> And definition based on above mentioned solution: declare module "*.png" { const value: any; export default value; } Tsconfig: { "compilerOptions": { "baseUrl": "./", "jsx": "react", "lib": ["es5",...

name : function(){} or function name (){} | ReactJS I am new to ReactJS and as I am learning I noticed that there's a few ways to declare functions such as, MyFunc : function(){ /// } or function MyFunc(){ /// } I was wondering which one shall i use and why? Those two are not interchangeable the way you posted them. In context where first works the second won't, and vice versa. – dfsq Jun 29 at 11:08 The first one is a syntax error, the second isn't ?! – Jonas W. Jun 29 at 11:08 It's not a react specific – The Reason Jun 29 at 11:08 ...

ReactJS - how do I update nested and “normal” state properties? This is how my state looks like: state constructor(props, context) { super(props, context); this.state = { show: false, btnLabel: 'GO!', car: { owner: false, manufacturer: false, color: false } }; } and this is how I modify state : state handleClickFetchPrice() { this.setState({btnLabel: 'Fetching data...' }); console.log(this.state.fetchPriceBtn); const url = 'some url'; axios.get(url) .then(res => { let car = [...this.state.car]; car.owner = res.data.owner; car.manufacturer = res.data.manufacturer; car.color = res.data.color; this.setState({car}); }) } The attribute car is updated, but fetchPriceBtn is not - the output of console.log(this.state.fetchPriceBtn); is still GO! . car fetchPriceBtn console.log(this.state.fetchPriceBtn); GO! What...

Write data to file from Gatsby I just want to log when a user clicks a button. This site is internal and I can’t use google analytics. Can’t use the fs module in react app. How do I input data for a gatsby site? How could I setup basic analytics? If Google Analytics isn't an option, maybe the open source Matomo f.k.a. Piwik could be? In any event, you'll need a backend/microservice for this. – Fabian Schultz Jun 29 at 13:43 By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.