I am making a react application where on click over an item below select box the respective item in next section gets scrolled. Working Example for above said scenario: https://codesandbox.io/s/scroll-into-view-in-react-7xtq9 Eg: Click on Item two, then its respective field set will gets scrolled to top.. Iss…
Tag: reactjs
Is there a well-established way to update local state immediately without waiting for an API response in React/Redux?
TL;DR: Is there some well-known solution out there using React/Redux for being able to offer a snappy and immediately responsive UI, while keeping an API/database up to date with changes that can gracefully handle failed API requests? I’m looking to implement an application with a “card view”…
mapStateToProps & mapActionsToProps not firing in react component
I have a component (SearchFilter.js) and am using connect to trigger mapStateToProps and mapActionsToProps on export. Trouble is, mapStateToProps isn’t firing — no props (neither state nor actions) show up in React DevTools and I can’t even console log from inside mapStateToProps. I’ve…
Compare and add property to array of object
I have two arrays of objects (Obj1 and Obj2). The difference is that Obj2 objects have an extra property called fn. I want to compare both arrays and if an object in Obj1 has fn in Obj2 for the same datakey then want to add fn in Obj1 also (the datakey is unique). I don’t want to change the order
react context provider return undefine as component
this the first time to me with context in Reactjs and have this problem Error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined. You likely forgot to export your component from the file it’s defined in, or you might ha…
React routing to endpoint but not rendering content
I can route to another endpoint, but the component content only appears on manual refresh. I’ve seen this question asked here, here, and I’ve been checking out the reactrouter docs, amongst others. The solution always seems to be “add withRouter” or “make sure you’re wrappi…
How do I properly use useSelector + createSelector (from ‘reselect’) in React app?
I am using reselect lib in my React project. Here is a code: Code for selector: As I mentioned in the App’s code, first commented line (where I destructure the object) works good: I’m fetching tickets from the server, put them in redux state, get them in App’s component and render them. But …
SyntaxError: Unexpected token ‘<' on shallow render with Enzyme and Jest in React
I am running tests with jest and enzyme in my React application, and while my simple sanity check test (2+2 expect 4) works, this error is thrown when I go to shallow render a component. It also throws when I try to replace shallow() with render() Here is the app.test.js file: babel.config.js: EDIT : I added …
I want to change the color of an image inside a image in html5-canvas
I’m using canvas to make a badge. To draw the image I used the code : The preview is like this. canvas-image Now, to color the images, I’ve tried using different blend modes. It works fine when I work it around for the background that is image. I tried to do it for the iconImage the same way, but …
React Input Component is not editable
The problem: my <input> is not editable. I am using React with Next, have a simple login form with just one <input> element of type=”email”, which has been working fine until I moved it to a modal window. So, in order to not trigger the “potential duplicate to…”, let …