A common error which occurs in react-navigation, when using TypeScript, is: Argument of type ‘string’ is not assignable to parameter of type ‘{ key: string; params?: undefined; merge?: boolean | undefined; } | { name: never; key?: string | undefined; params: never; merge?: boolean | undefine…
Tag: react-native
I receive an undefined value when I pass the value of a variable through props from a parent component to a child component
I create a variable pointsFilter in app.js and through props I send the value to a child component in this case the component is Map but when I want to extract the value I get undefined and when i do a console.log in app i get the value but when i do the same in map.js i get undefined app.js
React Native – Assign value from promise to variable
I have a couple repositories containing database calls such as getUser and getUsers. Now I export those repositories as followed: This leads to me having to do things like this: The intellisense says userRepository is: Is there a way how to assign the functions to userRepository without me having to do any th…
Defining hooks inside an array
I would like to create a bunch of filters to pause or play my Video. My implementation is something like as shown below: I know defining hooks inside an if condition is not correct. But how about defining them as above? Could it be done in a better way? Answer In order for React to correctly preserve the stat…
React Native, FlatList does not output my list correctly
I have this quite easy items where I normally loop over with map: The above code works fine, but as I learned, it is better do use FlatList in my components do render something in a loop. So I tried the following: The correct amount of items are rendered, but unfortunately, none of the props gets passed to th…
React native, the useEffect on a object state not working
Here is the code before the render So the state of HHDays stays null and the render shows an error on the frist {HHDays.allWeek.from} TypeError: null is not an object (evaluating ‘HHDays.allWeek’) Answer useEffect is called after the component was rendered. So when the code reaches that line the f…
React execute a function at varying time intervals [closed]
Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 7 months ago. Improve this question I have an API which returns a list of objects. Each of these objects have a field called ti…
Nested Navigation in React Native not compiling
I’m new to nested navigation. I have tried to follow the principles here – however I am getting the error Couldn’t find a navigation object. Is your component inside NavigationContainer? I have brought the ‘Screens’ into the main App.js for ease of debugging and sharing code. Bel…
Why are showing blank page in reactjs?
I am using class and constructor in react-js but this program does not error is thrown in console. show a message only blank. what is wrong? Answer You need to pass it as <Component />. And Still doesn’t work then add your index.html, there might be the issue then. PS: If you want to render only e…
How good is to apply React Context API for all screens
Currently I have four contexts that wrap all my routes (as shown bellow) so that I don’t have lost providers all around my app screens and components. As far as I know, when I modify the value of a context variable, every component that uses it will update too, what can lead to memory problems, but my q…