The problem with keyboard not dismissing gets more severe if you have keyboardType=”numeric”, as there is no way to dismiss it. Replacing View with ScrollView is not a correct solution, as if you have multiple textInputs or buttons, tapping on them while the keyboard is up will only dismiss the keyboard. Correct way is to … Read more
Does React re-render all components and sub-components every time setState is called? By default – yes. There is a method boolean shouldComponentUpdate(object nextProps, object nextState), each component has this method and it’s responsible to determine “should component update (run render function)?” every time you change state or pass new props from parent component. You can … Read more
TL;DR npm uninstall node-sass npm install sass Or, if using Yarn yarn remove node-sass yarn add sass Edit3: yes, another edit. Moving to sass (dart-sass) is the best solution. Previous one included locking node-sass to version 4.x.x, which is 2 years old and lacks newer SCSS features. Edit2: sass-loader v10.0.5 fixes it. The problem is … Read more
If you don’t want to set the environment variable, another option is to modify the scripts part of package.json from: “start”: “react-scripts start” to Linux (tested on Ubuntu 14.04/16.04) and MacOS (tested by aswin-s on MacOS Sierra 10.12.4): “start”: “PORT=3006 react-scripts start” or (may be) more general solution by IsaacPak “start”: “export PORT=3006 react-scripts start” … Read more
There is only one reason when one needs to pass props to super(): When you want to access this.props in constructor. Passing: class MyComponent extends React.Component { constructor(props) { super(props) console.log(this.props) // -> { icon: ‘home’, … } } } Not passing: class MyComponent extends React.Component { constructor(props) { super() console.log(this.props) // -> undefined // … Read more
2019: try hooks + promise debouncing This is the most up to date version of how I would solve this problem. I would use: awesome-debounce-promise to debounce the async function use-constant to store that debounced function into the component react-async-hook to get the result into my component This is some initial wiring but you are … Read more
If you aren’t using fetchBusinesses method anywhere apart from the effect, you could simply move it into the effect and avoid the warning useEffect(() => { const fetchBusinesses = () => { return fetch(“theURL”, {method: “GET”} ) .then(res => normalizeResponseErrors(res)) .then(res => { return res.json(); }) .then(rcvdBusinesses => { // some stuff }) .catch(err => … Read more
That is a curried function First, examine this function with two parameters … const add = (x, y) => x + y add(2, 3) //=> 5 Here it is again in curried form … const add = x => y => x + y Here is the same1 code without arrow functions … const add … Read more
The two approaches are not interchangeable. You should initialize state in the constructor when using ES6 classes, and define the getInitialState method when using React.createClass. See the official React doc on the subject of ES6 classes. class MyComponent extends React.Component { constructor(props) { super(props); this.state = { /* initial state */ }; } } is … Read more
Props and state are related. The state of one component will often become the props of a child component. Props are passed to the child within the render method of the parent as the second argument to React.createElement() or, if you’re using JSX, the more familiar tag attributes. <MyChild name={this.state.childsName} /> The parent’s state value … Read more