I’m trying to make a Covid-19 tracker App by ReactJS. I want to get data that only an object (a specific province value) from JSON API with ProvinceChange event. Problem : I can’t get data that is only an object (a specific province value). what I tried : I tried a method filter using province.nam…
Tag: react-hooks
React Hook is called in function that is neither a React function component nor a custom React Hook function
I have this following ESLint warning : React Hook “useBuilderFeatureFlagContext” is called in function “Slide.RenderBuilder” that is neither a React function component nor a custom React Hook function. and this is the following component : How do I write a rule that can whitelist this …
Check if button is active then get its value to pass down a button
The search button when clicked will redirect you to a google search based on the value from the input field, below is the site for advanced search, when active the link will add an additional link after “https://google.com/search?q=${input}+site%3A${activepage}.com, how do I check if one or many sites a…
Cannot read property of null when extracting data from state
I’m trying to display a navigation item when a flag is true, but the problem is, when I try to get the following data from it, it returned me undefined, I created the following for that: I did the checkAdmin function, because before that I had userInfo.user.isAdmin and it returned me undefined. Now I wa…
What’s going on with React’s useState?
So here is Piece of Code for onClick EventHandler in React code : Output : before 1st update inside 1st update After 1st update After 2nd update inside 2nd update Expected Output : before 1st update inside 1st update After 1st update inside 2nd update After 2nd update Could Someone Explain? Also, The example …
ReactJS + Typescript: Set component state with context property value without triggering a rerender
I am relatively new to ReactJS and I’m building an app with a Context. At some point I need to get one of the values from the Context, make it available for editing and only after it’s submitted change it’s value in the Context (to avoid refreshing all the other components). I thought of doi…
restoring scroll position in react project(hooks)
I have searched a few answers regarding my issue but found one relevant. Unfortunately, it is even on the class component, so I want to restore the scroll position after navigating back on the functional component. Here I will share the source code link on Stackblitz Answer There are few issues here. First: Y…
React Reconciliation Of Component Instances
I’ve been trying to understand react reconciliation and am getting really confused by some of the details of how the diffing algorithm works. So far, I understand that whenever an update is made, we create a new react element tree and compare it with our previous react element tree. The diffing algorith…
Run set interval when click from another component React
i want to trigger countdown of 60 seconds when user click from another component . so far i didn’t find any solution it is not working i search a lot but did not find.Thanks Answer Remember to clear your interval
Make state related index make true while other state always false
this is my function to make related state true I need to make index related state true while at the same time states not equal to index need make false, How can I achieve that in the same function above as a example – in current condition, if I expand (index 1), then expand (index 2) my array looks like