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, $_GET['naam'] returns test: export function ... it's possible. With $_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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938 views

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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 app for importing components, resources, ... import action from '@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) doesn't seem to register query params, ... and reacted-to the 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 same object is required In all other ... for these problems 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 useEffect with []. useEffect(() => { ... moment when the component 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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939 views

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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 vanilla JS examples online and it seems ... equivalent of the JQuery 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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851 views

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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 my elements don't have a unique key prop ( ... <div id="app" 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 contains a navigation component for the ... change without repeating 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 is already outdated or not as RN is ... . What is the correct 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' [prettier/prettier] This is the .eslintrc.json: { ... ": false, } 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 React.js. When speaking of its ... mentionned. What's 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 And created a 'new project'. react ... (D:projects ew_proj 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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778 views

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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 second argument to useCallback - non-ever ... umd/react-dom.production.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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952 views

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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 simple console.log() to see how many time it ... a timeline and/or all 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 redirect from HomePage("/") to / ... add anything other than 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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944 views

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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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979 views

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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. For now I just want to have my non logged ... at the React Dev 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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864 views

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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 16.3 doc says. Is there anything more to ... lifecycle or is it just 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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797 views

1 answer

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 recently and now I am integrating it with ... out the problem. Any 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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1.3k views

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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 I've tried so may things I've lost ... on the dozens of answered 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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792 views

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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 use the functional form, because the updated ... will be called, 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 be used instead of className, ... besides being backwards compatible 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: [ "Yes", "No", "I don't know ... Answers in props, it does itterate 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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835 views

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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 previous versions and I expect this sample ... say hide this component 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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974 views

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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 should not use <Link> outside a <Router> My ... ? Here's a Sandbox 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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887 views

1 answer

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 know that react composing the object ... bring this property 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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877 views

1 answer

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-course-form"> <input type="text" ... -course-form input[type=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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1.2k views

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reactjs - React Router Pass Param to Component

const rootEl = document.getElementById('root'); ReactDOM.render( <BrowserRouter> <Switch> <Route exact path="/"> <MasterPage /> </Route> <Route exact path=" ... how to pass the 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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