Recent questions tagged ReactJs

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reactjs - Axios get in url works but with second parameter as object it doesn't

I'm trying to send GET request as second parameter but it doesn't work while it does as url. This works, ... $_POST it doesn't work either. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - How to avoid using relative path imports (/../../../redux/action/action1) in create-react-app

I've been using create-react-app package for creating a react website. I was using relative paths throughout my ... '@resource/css/style.css' See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - How do you programmatically update query params in react-router?

I can't seem to find how to update query params with react-router without using <Link/>. hashHistory.push(url ... way that param changes are? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - How to declare a global variable in React?

I initialized i18n translation object once in a component (a first component that loads in the app ). That ... and not i18n specific solution. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - React hooks useEffect only on update?

If we want to restrict useEffect to run only when the component mounts, we can add second parameter of ... is updated except initial mount? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - How to get the width of a react element

Im trying to create a range input that displays a tooltip right above the slider thumb. I went through some ... method $(element).width() See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - How to create unique keys for React elements?

I am making a React app that allows you to make a list and save it, but React has been giving me a warning that ... class="center"></div> </div> See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - Using React-Router with a layout page or multiple components per page

I am adding react router to an existing project. At present a model is passed in to a root component which ... the layout code in both? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - How to create helper file full of functions in react native?

Though there is a similar question I am failing to create a file with multiple functions. Not sure if the method ... way to do this please? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - Why do I keep getting Delete 'cr' [prettier/prettier]?

I am using vscode with Prettier 1.7.2 and Eslint 1.7.0. After every newline I get: [eslint] Delete 'cr' [ ... How can I get rid of this error? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - Difference between declarative and imperative in React.js?

Recently I've been studying a lot about the functionality and the ways to use the Facebook JavaScript library ... the difference between both? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - How to resolve the error on 'react-native start'

I just installed node.js & cli installed node.js installed react-native-cli npm -g react-native-cli ... ode_modulescommanderindex.js:651:12) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - What's the difference between useCallback and useMemo in practice?

Maybe I misunderstood something, but useCallback Hook runs everytime when re-render happens. I passed inputs - as a ... .min.js"></script> See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - Trace why a React component is re-rendering

Is there a systematic approach to debug what is causing a component to re-render in React? I put a ... components tree renders and order? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - react app showing empty page when redirecting on production build

I have a reactJs app which is running on a server that has nginx on it. The problem is that when I try to ... urls in .env? Thanks in advance. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - Is it possible to override material-ui components default props?

Lets say I want every Button component from material-ui to have default props of variant="contained" color="secondary". Is this possible? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - Nested Routes not rendering with React Router v4

I am trying to group some of my routes together with React Router v4 to clean up some of my components. ... Tools these two routes return Null. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - Can getDerivedStateFromProps be used as an alternative to componentWillReceiveProps

getDerivedStateFromProps is being added as a safer alternative to the legacy componentWillReceiveProps. This is what the 16. ... a name change? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - Can't send a post request when the 'Content-Type' is set to 'application/json'

I am working on a React application and I am using fetch to send a request. I have made a Sign Up form ... kind of help will be appreciated. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - deploying create-react-app to heroku with express backend returns invalid host header in browser

The title says it all. I've built a minimal working example here: https://github.com/sehailey/proxytest ... threads asking this question. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - Why React useState with functional update form is needed?

I'm reading React Hook documentation about functional updates and see this quote: The + and - buttons ... capturing the most recent count. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - class vs className in React 16

I saw that React 16 allows for attributes to be passed through to the DOM. So, that means 'class' can ... with previous versions of React. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - forEach() in React JSX does not output any HTML

I have a object that I want to output via React: question = { text: "Is this a good question?", answers ... but is not outputted into HTML. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - react router v4 default page(not found page)

This is common purpose, directing unmatch request to notfound page. making this with react-router v4 looks like ... for valid url path? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - You should not use <Link> outside a <Router>

I'm trying to set up react-router in an example application, and I'm getting the following error: You ... link to demonstrate the problem. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - Set loading state before and after an action in a React class component

I have function which dispatched an action. I would like to display a loader before and after the action. I ... to the component-state only. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - Clear and reset form input fields

I have a form containing various input fields and two buttons; one for submitting and one for cancelling. <form id="create ... =text]').val(''); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - React Router Pass Param to Component

const rootEl = document.getElementById('root'); ReactDOM.render( <BrowserRouter> <Switch> <Route exact path="/"> ... ID on to the DetailsPage ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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