Here’s how you can do it without helper libs: handleChange: function (e) { // 1. Make a shallow copy of the items let items = […this.state.items]; // 2. Make a shallow copy of the item you want to mutate let item = {…items[1]}; // 3. Replace the property you’re intested in item.name=”newName”; // 4. Put … Read more
If you’ve previously installed create-react-app globally via npm install -g create-react-app, we recommend you uninstall the package using npm uninstall -g create-react-app to ensure that npx always uses the latest version. Docs Use either one of the below commands: npx create-react-app my-app npm init react-app my-app yarn create react-app my-app if npm uninstall -g create-react-app … Read more
The edit you posted was valid for an older version of React-router (v0.13) and doesn’t work anymore. React Router v1, v2 and v3 Since version 1.0.0 you define optional parameters with: <Route path=”to/page(/:pathParam)” component={MyPage} /> and for multiple optional parameters: <Route path=”to/page(/:pathParam1)(/:pathParam2)” component={MyPage} /> You use parenthesis ( ) to wrap the optional parts of … Read more
This is due to this.delta not being bound to this. In order to bind set this.delta = this.delta.bind(this) in the constructor: constructor(props) { super(props); this.state = { count : 1 }; this.delta = this.delta.bind(this); } Currently, you are calling bind. But bind returns a bound function. You need to set the function to its bound … Read more
There are multiple ways of doing this, since state update is a async operation, so to update the state object, we need to use updater function with setState. 1- Simplest one: First create a copy of jasper then do the changes in that: this.setState(prevState => { let jasper = Object.assign({}, prevState.jasper); // creating copy of … Read more
The curly braces are inside the string, so it is being evaluated as string. They need to be outside, so this should work: <div className={“btn-group pull-right ” + (this.props.showBulkActions ? ‘show’ : ‘hidden’)}> Note the space after “pull-right”. You don’t want to accidentally provide the class “pull-rightshow” instead of “pull-right show”. Also the parentheses needs … Read more
I suggest to look at Dan Abramov (one of the React core maintainers) answer here: I think you’re making it more complicated than it needs to be. function Example() { const [data, dataSet] = useState<any>(null) useEffect(() => { async function fetchMyAPI() { let response = await fetch(‘api/data’) response = await response.json() dataSet(response) } fetchMyAPI() }, … Read more
Edit: Things change fast and this is outdated – see update Do you want to fetch and execute the script again and again, every time this component is rendered, or just once when this component is mounted into the DOM? Perhaps try something like this: componentDidMount () { const script = document.createElement(“script”); script.src = “https://use.typekit.net/foobar.js”; … Read more
Check out this link (Running react-native run-ios occurs an error?). It appears to be a problem with the location of Command line tools. In Xcode, select Xcode menu, then Preferences, then Locations tab. Select your Xcode version from the dropdown and exit Xcode.
componentDidMount() This method is called once after your component is rendered. So your code would look like so. var AppBase = React.createClass({ componentDidMount: function() { var $this = $(ReactDOM.findDOMNode(this)); // set el height and width etc. }, render: function () { return ( <div className=”wrapper”> <Sidebar /> <div className=”inner-wrapper”> <ActionBar title=”Title Here” /> <BalanceBar balance={balance} … Read more