Say I have a variable arr that is either type [number, ‘number’] or [null, ‘null’]. Is it possible to infer the type of arr[0] based on the value of arr[1]? Here is the issue, I don’t think my use case works with function overloads since the value of arr[1] is a side effect of th…
Tag: reactjs
Not able to get the res.json() value from nodejs server
I am using react.js as frontend and nodejs for the backend. My client-side code is And My server-side code is Front-end output In the server-side code, you can see that I am returning the res.json. but On the client-side, I am not getting the value that I have returned from the server. Please, can anyone help…
Should I use connect or hooks for react redux and which has better performance?
I am using react-redux for my react project, apparently, there are 2 ways to use the redux state connect or useSelector, My redux store has a reducer for each page, For Home Page > homePageReducer For Message Page > messagePageReducer For Authentication > authReducer For User’s blog > blogRe…
add block-input from sanity.io to next.js blog post
I’m developing a blog on next.js with sanity.io, and I’m having trouble using the code-input plugin. What I do have I’m able to use the code component block on sanity, which looks something like this: Everything good on the sanity side. My problem comes with using it on the next.js [slug].js…
How to use an async database call to set a variable with useState() and useEffect()?
I’m trying to set a variable with a simple GET database call. The database call is returning the data correctly, but the variable remains undefined after every re-render. Code is below… the getMyThing() function in the useState() function is working correctly and returning the data I want. My thin…
How to get borders for the react-leaflet map and check markers inside the map?
My code is here: My question is, how can I use bbox to check if some of my markers is inside the map? When I try to apply: or this: I faced the error: bbox is not defined I don’t know how to return bbox from function LocationMarker(). I would be grateful for any help. Thank you. Answer You need
Undefined parameter used within function
I am reading Redux tutorial and in a code snipped there is ‘prevCounter’ variable used without being initialized – ‘()’ has no param within it. How is it possible that prevCounter can be used within setCounter call? Is prevCounter by default initialized with counter state thanks …
How can I do to disable geolocalization?
I am working using react.js and the module useposition but I would like to know how can I do to disable the popup of geolocalization if I go directlry to this path : http://localhost:3000/activation I mean if I go to this route : http://localhost:3000/activation => I don’t have the popup of geolocali…
ReactJs: TypeError: Cannot read property ‘length’ of undefined
I need to setup rich text box in my content body section, so I like to use npm react-quill It’s install succesfully then I have used a bubble them form react-quill It’s also warking succesfully. But when I try to show my post then display like this: But I need to plain text with rich text editor. …
How to define React component with conditional props interface?
i need to define “Field” component that renders textarea or input depends on prop multiline I trying to do this like that: But typescript provide several errors like: Playground here How can i define such component? Answer Problem: No T in Field You have defined a generic type Props that depends o…