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: … Read more
reactjs
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 … Read more
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 … Read more
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” /> … Read more
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 … Read more
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 … Read more
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 … Read more
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. … Read more
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 … Read more
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 … Read more