I want to update and re-render for loop test condition on hook state update. After I update state hook the state is rerendered but I want to the loop to be rerendered too. I make a form. The length of the form depends on what number I enter on input. Here is what I tried: Answer There is no need
Tag: react-hooks
Uncaught TypeError: Cannot read properties of Undefined (reading ‘getTotalLength’)
I’m trying to animate the SVG with GSAP. But the console.log says “Uncaught TypeError: Cannot read properties of undefined (reading ‘get total length’)”. It reacts project and this is the code I used inside of “useEffect”. Can anyone tell me what’s wrong with my code? I try to search on google but most of the answers were about “null” This
React setState of an object with count
I have an array of integers from 0 to 6 as input I need to return an object with the count of each of those numbers but I can’t do the function for the set of values I am expecting this Can you help me? Thank you very much Answer You can use reduce()
Is it valid to use the “return” keyword in a useEffect to stop code execution?
I was debating with a collegue today about using the “return” key in a useEffect to stop code execution. I have learned that using return should only be done in a cleanup. The issue: The way I see this is that we should perhaps have yet another useEffect that only execute if the state is false and not use the
Unpredictable state change
I am dynamically creating mathlive fields and adding them to the DOM. Though it isn’t a good way but doing it like this because I wasn’t able to add the element as a React component and I needed a workaround quickly Now when I remove an element from array responsible for rendering the elements, it works as expected but when
React rerender component on database change
Im trying to develop a dynamic todoList. I have two components TodoList, and Todo. TodoList fetches with useSWR the data from Mongo and puts the data in a div depending if they’re completed or not. Todo component has a button to mark if the task its completed or not. When you click the input check it changes automatically on mongo.
How do I update dynamic array inside useEffect in Typescript?
I have an array declared as Then set the array with the values as Then I want to update this array from useEffect. I tried below code when displaying subjects array, it is not updating with “Java”. Can anyone help me to solve this? Answer You are not triggering any re-rendering of your component. Re-renders run when props or states
why is MUI CORE basic rating code is giving me setValue as undefined?
i tried using MUI CORE for first time and it’s giving me arror as i wanted to use active first rating and set value is not defined i Answer Ey! The only thing that i can see is that you are trying to use “setValue” in the “onChange” event handler for the “Rating” component, but there is not a “setValue”
Have checked countless times and can’t figure out where my error is: Uncaught TypeError: Cannot read properties of undefined (reading ‘lat’)
I’ve been playing around with the OpenWeatherMap API to learn to code and have run into a series of TypeError issues popping up in my console. My assumption is that my program is attempting to use data from the API before it is finished fetching, but I have set the fetch functions up to wait until receiving a response to
What is a good default value for setting timeout conditionally?
setTimeout returns a number, a timeoutId, which is used by clearTimeout to identify and remove it. However, what value do I use if I want to set the timeout conditionally? Is 0 a safe ID to use? It’s used in a React context where clearing the timeout is generally considered good practice. Or is it perhaps better to wrap the