React Router v6, using hooks In react-router-dom v6 there’s a new hook named useSearchParams. So with const [searchParams, setSearchParams] = useSearchParams(); searchParams.get(“__firebase_request_key”) you will get “blablabla”. Note, that searchParams is an instance of URLSearchParams, which also implements an iterator, e.g. for using Object.fromEntries etc. React Router v4/v5, without hooks, generic React Router v4 does not … Read more
In my case (using Webpack) it was the difference between: import {MyComponent} from ‘../components/xyz.js’; vs import MyComponent from ‘../components/xyz.js’; The second one works while the first is causing the error. Or the opposite.
The reason is, in state you defined: this.state = { fields: {} } fields as a blank object, so during the first rendering this.state.fields.name will be undefined, and the input field will get its value as: value={undefined} Because of that, the input field will become uncontrolled. Once you enter any value in input, fields in … Read more
React circa 2020 In the onClick callback, call the state hook’s setter function to update the state and re-render: const Search = () => { const [showResults, setShowResults] = React.useState(false) const onClick = () => setShowResults(true) return ( <div> <input type=”submit” value=”Search” onClick={onClick} /> { showResults ? <Results /> : null } </div> ) } … Read more
The following solution uses ES6 and follows best practices for binding as well as setting the ref through a method. To see it in action: Hooks Implementation Class Implementation After React 16.3 Class Implementation Before React 16.3 Hooks Implementation: import React, { useRef, useEffect } from “react”; /** * Hook that alerts clicks outside of … Read more
First off, let me express that this is generally not the way to go about things in React land. Usually what you want to do is pass down functionality to children in props, and pass up notifications from children in events (or better yet: dispatch). But if you must expose an imperative method on a … Read more
Easy Way Use an arrow function: return ( <th value={column} onClick={() => this.handleSort(column)}>{column}</th> ); This will create a new function that calls handleSort with the right params. Better Way Extract it into a sub-component. The problem with using an arrow function in the render call is it will create a new function every time, which … Read more
What is wrong with this approach? Why would I want to use Redux Thunk or Redux Promise, as the documentation suggests? There is nothing wrong with this approach. It’s just inconvenient in a large application because you’ll have different components performing the same actions, you might want to debounce some actions, or keep some local … Read more
@Dhiraj’s answer is correct, and for convenience you can use the autoFocus prop to have an input automatically focus when mounted: <input autoFocus name=… Note that in jsx it’s autoFocus (capital F) unlike plain old html which is case-insensitive.
Introducing npx: an npm package runner NPM – Manages packages but doesn’t make life easy executing any.NPX – A tool for executing Node packages. NPX comes bundled with NPM version 5.2+ NPM by itself does not simply run any package. It doesn’t run any package as a matter of fact. If you want to run … Read more