I have an array of objects which I want to map it and set the objects into the messagesList state, but only the last object is set. Actually, I want the setting to be done as soon as the map is executed but here it is done only once and the last item of the array is set. You can
Tag: reactjs
Default value is not displaying in select drop down box of react hooks app
In my react hooks select drop down, the default value is not displaying. On page load I would like to display Select Position in the drop down. Could someone please advise why it is not displaying the default value ? code sandbox link: https://codesandbox.io/s/sad-diffie-kx9h49?file=/src/App.js:0-991 Answer C…
Spread objects into a state array
I am trying to spread values as objects into a state array in react, but this code causes this error: Error: TypeError: Invalid attempt to spread non-iterable instance. In order to be iterable, non-array objects must have a [Symbol.iterator]() method. Is there a chance I can spread values from the data array …
React/Redux Toolkit render issue when deleting state from an array
Problem: Component render starts to drift from actual state Desired Output: Component render matches state. So. I’m going to give a bit of a high-level overview with pseudocode as this issue is quite complex, and then I’ll show the code. I have a main form, and this form has an array of filter-sta…
How to stop ReactJS countdown timer from re-rendering?
I’m currently using a simple Countdown Timer component. This is the code of the component: My issue is that everytime I refresh my page, the timer starts again. I understand this has something to do with react re-rendering the components and I need to move this to a higher level to save state, but IR…
how to create a dynamic div on a React JS, and second is how to give that div a dynamic ID, this code below is JS code?
How to rewrite this code with React.js? Full code: Answer You can actually do this in your components render function, it would look something like this Assume that div with id board is your board where you append created elements. Also I’m not sure what updateTile do, so if you would need some help wit…
Date.getTime() in Next.js returns weird numbers
I am trying to make a page transition in Next.js. As the transition is slower than the page load, I need to calculate the missing time for the animation to finish. The transition should last at least 2 seconds, 1s for a fade in of the loading screen, 500ms so that the loading screen stays a little, and 500ms …
React Testing with Jest and useParams-hook, tried with MemoryRouter
How do I test a component which needs the parameter from react-router to work? Carousel.js component Carousel.test.js The test works if I comment the line with useParams out and just declare const id = 1;. Then I’ve tried to use MemoryRouter. Carousel.test.js v2 And the test failed with this output It s…
How can I toggle styles (background-color to be specific) on multiple buttons with the same class (react.js)
So I have multiple setting buttons and I need them to individually toggle their background colors here’s a simplified jsx example CSS but of course this won’t work because the style would be applied to all the buttons at once. How can I identify which one is clicked and style that specific button …
The tag is unrecognized in this browser. If you meant to render a React component, start its name with an uppercase letter
MyIcons.tsx MyFile.tsx Errors: The tag <ICONCAR> is unrecognized in this browser. If you meant to render a React component, start its name with an uppercase letter The tag <ICONHOME> is unrecognized in this browser. If you meant to render a React component, start its name with an uppercase letter.…