Recent questions tagged ReactJS

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reactjs - How do you change a style of a child when hovering over a parent using material-ui jss styles

I'm using material-ui in react. Let's say I have this component with these styles const ... b1gcd?fontsize=14&hidenavigation=1&theme=dark 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 "Cannot use import statement outside a module" in jest

I have a React application (not using Create React App) built using TypeScript, Jest, Webpack, and Babel. When trying ... to not go that route. See Question&Answers more detail:os...

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

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880 views

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reactjs - draftjs how to initiate an editor with content

Stumbled on this cool text editor, draft.js by Facebook. I tried to follow the example in Github, but I ... .getBlockMap is not a function". 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: Updating state when state is an array of objects

I have an array of objects in state: this.state = { items: [ {id: 1, someattr: "a string", ... object returned by the initial find operation? 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 long press event

Is there a way to add long press event in react-web application? I have list of addresses. On long press ... address followed by a confirm box. 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 - SyntaxError with Jest and React and importing CSS files

I am trying to get my first Jest Test to pass with React and Babel. I am getting the following error: SyntaxError: ... }, So what am I missing? 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 - Preset files are not allowed to export objects

I have a carousel file in which I want to get index.js and build block.build.js, so my webpack.config.js ... anyone know how to solve this? 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-Redux: Actions must be plain objects. Use custom middleware for async actions

Unhandled Rejection (Error): Actions must be plain objects. Use custom middleware for async actions. I wanted to add ... , postId } }) } 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 remove the hash from the url in react-router

I'm using react-router for my routing and I use the hashHistory option so that I could refresh the page ... .getElementById('app-container')); 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: Why component's constructor is called only once?

In the following example, when Item 2 is clicked, Second 1 is shown instead of Second 2. Why? How would you fix that? ... ()} </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 - Callback when DOM is loaded in react.js

I want to have a callback invoked on my react.js component when it's DOM element (including all child nodes) is ... like <body> and <img>. See Question&Answers more detail:os...

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

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692 views

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reactjs - onKeyDown event not working on divs in React

I want to use a keyDown event on a div in React. I do: componentWillMount() { document.addEventListener("keydown", ... Codepen How can I do it? See Question&Answers more detail:os...

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

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557 views

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reactjs - Binding vs Arrow-function (in JavaScript, or for react onClick)

So I am trying to learn JavaScript and/or react and got a little mixed up with understanding .bind(this) in the ... 'this' refers to the class } See Question&Answers more detail:os...

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

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678 views

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reactjs - Generating a PDF file from React Components

I have been building a polling application. People are able to create their polls and get data regarding the ... approach should I follow ? See Question&Answers more detail:os...

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

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645 views

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reactjs - Inserting the iframe into react component

I have a small problem. After requesting a data from a service I got an iframe code in response. <iframe src=" ... html in react or using JSX? See Question&Answers more detail:os...

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

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846 views

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reactjs - How to submit a form using Enter key in react.js?

Here is my form and the onClick method. I would like to execute this method when the Enter button of keyboard is ... }>Comment</button> </form> See Question&Answers more detail:os...

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

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775 views

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reactjs - Set types on useState React Hook with TypeScript

I'm migrating a React with TypeScript project to use hooks features (React v16.7.0-alpha), but I cannot figure ... props. Thanks for your help. See Question&Answers more detail:os...

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

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693 views

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reactjs - react-router vs react-router-dom, when to use one or the other?

Both have Route, Link, etc. When to use one or the other? I'm really confused on where to use each one. ... or the other, any help 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 - Inline CSS styles in React: how to implement a:hover?

I quite like the inline CSS pattern in React and decided to use it. However, you can't use the :hover and ... span). Is there a simpler way? See Question&Answers more detail:os...

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

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601 views

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reactjs - How to minimize the size of webpack's bundle?

I'm writing a web app using react and webpack as my module bundler. My jsx code is really light so far, the size of ... bcrypt": "~0.8.5" } } See Question&Answers more detail:os...

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

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896 views

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reactjs - How to unmount, unrender or remove a component, from itself in a React/Redux/Typescript notification message

I know this question has been asked a couple of times already but most of the time, the solution is to ... , and manipulate it only internally? See Question&Answers more detail:os...

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

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668 views

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reactjs - React vs ReactDOM?

I'm a bit new to react. I see we have to import two things to get started, React and ReactDOM, can ... documentation, but it doesn't say. See Question&Answers more detail:os...

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

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587 views

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reactjs - React passing parameter via onclick event using ES6 syntax

How to pass extra parameters to an onClick event using the ES6 syntax? For instance: handleRemove = (e) => ... this.handleRemove(id)}></button> 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 - Re-initializing class on redirect

I am currently at http://example.com/parentdir/module/2/ This URL actually loads the Module.js class as ... just a matter of preference? See Question&Answers more detail:os...

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

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655 views

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reactjs - Getting error Cannot read property 'setState' of undefined

I'm new with Reactjs. I'm trying to do something very simple: update a div inside a render function ... document.getElementById('container') ); See Question&Answers more detail:os...

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

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555 views

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reactjs - What does the colon mean in Javascript after function?

I saw the Facebook F8 app code there is a ":" after the function function setup(): React.Component { ... } What does this mean? Inheritance? See Question&Answers more detail:os...

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

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774 views

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reactjs - React Router 4 Nested Routes not rendering

I'm trying to do nested routing in one of my components. Here's the parent component: const App = () => ( ... page. Any idea why this might be? See Question&Answers more detail:os...

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

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1.0k views

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reactjs - React: Hide a Component on a specific Route

New to React: I have a <Header /> Component that I want to hide only when the user visit a specific page. The way ... ={Contact} /> </Switch> ); See Question&Answers more detail:os...

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

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