reactjs Archives - Page 6 of 9

How to combine multiple inline style objects?

In React you can clearly create an object and assign it as an inline style. i.e.. mentioned below. var divStyle = { color: ...

May 18, 2022
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What does the error “JSX element type ‘…’ does not have any construct or call signatures” mean?

I wrote some code: function renderGreeting(Elem: React.Component<any, any>) { return <span>Hello, <Elem />!</span>; } I’m getting an error: JSX element type Elem does ...

May 17, 2022
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Having services in React application

I’m coming from the angular world where I could extract logic to a service/factory and consume them in my controllers. I’m trying to ...

May 17, 2022
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Get form data in ReactJS

I have a simple form in my render function, like so: render : function() { return ( <form> <input type="text" name="email" placeholder="Email" /> ...

May 17, 2022
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ReactNative: how to center text?

How to center Text in ReactNative both in horizontal and vertical? I have an example application in rnplay.org where justifyContent=”center” and alignItems=”center” is ...

May 16, 2022
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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 ...

May 16, 2022
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How to compare oldValues and newValues on React Hooks useEffect?

Let’s say I have 3 inputs: rate, sendAmount, and receiveAmount. I put that 3 inputs on useEffect diffing params. The rules are: If ...

May 15, 2022
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Cannot use JSX unless the ‘–jsx’ flag is provided

I have looked around a bit for a solution to this problem. All of them suggest adding "jsx": "react" to your tsconfig.json file. ...

May 15, 2022
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Invalid Host Header when ngrok tries to connect to React dev server

I’m trying to test my React application on a mobile device. I’m using ngrok to make my local server available to other devices ...

May 15, 2022
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Typescript input onchange event.target.value

In my react and typescript app, I use: onChange={(e) => data.motto = (e.target as any).value} How do I correctly define the typings for ...

May 14, 2022
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