I have below code : In this, iState has Error portion nested within – When I am trying to update the nested state of Error , its not getting updated – I can see it entering within else block , but not updating the state. I also tried with – setstate({…state.Error, EName:”}) EDIT …
Tag: react-hooks
Reactjs custom hook won’t fire using an if/else in useEffect?
I extracted my reducer function in a custom hook. When I try to fire decreaseMinutes from the custom hook nothing happens. The other functions of the hook work great tough – such as toggleActive- (probably because they are in an event handler). Any idea how I can solve this? Reducer + Hook Component: Ma…
Rewrite useEffect hook from componentDidUpdate lifecycle method
Suppose we have an input for buyer id and we want to fetch the buyer details each time the buyerId is changed. The following code looks like this for class components But if we want to use useEffect hook inside a functional component how would we control it. How can we compare the previous props with the new …
I use useState hock to store the value but it did not update
I am new to Reactjs I am trying to build an address form with 3 Select ( country, State, City ) I used React hock so when the page first load it will fetch countries list to country select after that when user select country it will fetch states list to state select and after that when user select state
ReactJS useState hook – asynchronous behaviour
I am building a page to list products. So I’ve one input:file button to select multiple images and then I’m calling an API to upload that images on the server and displaying progress in UI with images. Here’s my code. As the useState is asynchronous, I can’t directly pass that react st…
Unable to increment or decrement my quantity value React JS
So I am building a shopping cart, I am done with most of my code but when I try to increment or decrement the value of a product quantity from cart it just fetches me the value of current quantity it doesn’t get updated. I am unable to understand where I am making the mistake. This is my cart.js file
TypeError: undefined is not an object (evaluating ‘availableMeals.filter’). I don’t why I am getting this error
I am using the useSelector() hook to pass state as a prop but I am getting an error saying: /store/reducers/meals.js: CategoryMealScreen.js: I don’t know why I am getting this error. Answer The issue is with your reducer , You are returning an action instead of state . Please change this to
My React state doesn’t update when setState is called
I’m trying to make a simple animation when the burger element is clicked I’m trying to update the following state with an animation when the burger is clicked but the state doesn’t update no matter what i try. Edit: Someone suggested i post the full code Answer There’s a lot of bad sme…
How to get the correct state in an useEffect hook, after another useEffect hook modifies the same state?
I have two useEffect hooks, which will both run on change in startTime/endTime state. I understand from looking around that this is probably because React does some sort of batching for performance gain such that setState is async in nature. Also, the fetch call would be async too, so it will take time to set…
React email address format validation
I’m building a portal where students from only 6 universities can participate so I need a way to limit the email address type to these 6 universities for example emails ending with @mit.edu How do I implement this in React with the form validation set to characters and on clicking on of these formats fr…