I’m new in react and I’m a bit confused about how React runs update on every new input’s keystroke, for exapmpe, this is the form and I want to update the state on every keystroke What I don’t understand here is the update cycle, my understanding is the following: As the input’s …
Tag: use-state
Show/Hide Component by passing useState Value React
I’m building a website with React and Bootstrap which would have a static footer. The footer will contain two buttons – Back, and Next. Clicking ‘back’ decrements an index, and clicking ‘next’ would increment the index. Ideally this index would keep track of which js compon…
Reactjs: Why doesn’t state boolean lock on event listener?
React Noob – thought I’d ask here for a quick answer before I spend hours digging. In the example below I have an event listener inside useEffect that listens for scroll position on a container and fires a trigger after a point if it hasn’t done so already. I want to know why the event still…
How to update texts in React
Good evening everyone, I am trying to create an online application to take quizzes in order to practice for exams. My problem is as follows: I have the following ‘App’ component: And its output is the following image: Where as we can see, the active navbar element and the Home sign that is between…
When a button in React is clicked, the component renders twice
I’m pretty new to React, and I’m making an ecommerce website for practice. I have a cart component that dynamically renders cart items from an API, but I narrowed the problem 100% down to the front end. On the initial render, it works fine, everything that is in the database cart appears, however …
React TypeScript select field does not display
I got useState with a list of strings (currencies symbols like “USD”, “EUR” etc.) And I need to display it into the select field, right now I’m using this: It says the bug is in {symbols.map((symbol) =>…, but I have no idea what to do with it. Full Error: Answer add retu…
ReactJS counter or timer with Start or Stop Button
Need help to understand in useEffect, if I don’t put counter and timerCheck in useEffect dependency then what it will effect here. And if I put timerCheck dependency in useEffect then counter increasing 100 time faster Also how can i run this code without any error or warning code in codesandbox Answer …
Adding items in the nested array of React state
I’m trying to add new items to an array of an object that resides in another object of a state. Pretty nested. So I tried the following way… Now I want to add another object inside the object of series array with useEffect(). And I tried: The way I’m copying …options works absolutely f…
Maintaining react state with a hierarchical object using react hooks (add or update)
I have an a state object in React that looks something like this (book/chapter/section/item): I have code that adds or inserts a new chapter object that is working. I am using: And for the chapter update, this is working: But for my update/create for the sections, I’m having trouble using the same appro…
How to sum, divide values of multiple inputs using onChange event | ReactJS
i try make my first App in react, everything works, but i try take amoun of bill and number of people and divide te bill for person, and add Tip. I know for somebody probably its 5 min solution but i start working with that yesterday and still can’t find solution. I wanna take bill amount and divide by …