Im trying to create a drawing application in react, its working for the most part. But when i try add an undo button it doesnt work. I try make the undo button with this finishDrawing() function, where i use getImageData and store it in an array called restore_array then when a Undo button is clicked i try to reload this
Tag: use-effect
useEffect with many dependencies
I am trying to fetch employees and here is what I am trying to do using useEffect Here I want to achieve 2 goals: fetch adminEmployees if (adminEmployees===’unAuthorized’) then go to loginPage but when doing this as in the code, it creates infinite loop. How can I achieve the desired functionality? Answer Easy dirty path: split useEffect into 2 Better
Refactor React UseEffect removing repeating else if
I have the following useEffect I want to refactor it, removing all these else if lines See the code As you can see the country: GB, DE, FR, BR, US, IT, US, ES and MX sharing the same setIsDisable(false) How would you write in 1 line of code whitout repeating the same else if ? Answer if you want to
redux is not re-rendering component with React 18
I have a custom hook which handles global data fetching based on user authentication. the hook is like this: but since I am using React 18 strict mode (in NextJS), the useEffect only runs twice with userState === “loading” value and won’t run when state updates. I’m not sure if I should give more details of my code. If you
SetState inside useEffect is causing side effects on select input functionality
Each select menu comes with a help text inside a box. Similar to a tooltip. User can close them when clicking ‘close button’ or clicking outside. My solution works and they are being closed each time you click outside them. The problem is that setState inside the useEffect has a side effect on the select menus. The issue is when
How to update my useEffect hook when State change happen in a different .js file’s component in ReactJS?
I am trying to make an API call in useEffect() and want useEffect() to be called everytime a new data is added in the backend. I made a custom Button(AddUserButton.js) which adds a new user in backend. I am importing this button in the file (ManageUsers.js) where I am trying to display all the users. I just wanted to make
Custom use effect comparator : ReactJS
I am having a state variable that is defined as follows where done has the following structure I want to run the useffect when some changes are made to the done and also values array under each object. In my case, useEffect gets triggered when I remove/add an objects to the done. But not when some changes happen inside values
UseState renders me the previous state
I have two inputs that change the text of a P tag at the same time, but the problem is that the render that shows me is always the previous value that was saved. I understand that I have to use a useEffect to render the component again and show the current value, but in the inputs handleChange if or
React useEffect dependency not triggering from async callback
I’ve tried to break this down to it’s simplest components to understand why the useEffect in ButtonStatus is not updating when the state of eventDataId is updated in the processClickButton function of the ButtonView React Component. In this example, I’m making calls to ethereum’s smart contract on my local Ganache instance, and that is working fine and returning a vew
Changing object in an array does not trigger change in html React
The object I want to edit gets edited in JSON format, but only previous data gets displayed in the browser. I use these hooks to get a list of products from local storage Then I map all of the objects incrementAmount() function looks like that: From what I see in the console, the array looks fine and the object I