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 value is tied to react state, the initial
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 component to show or hide using a ternary statement with with display: ‘inline’ or ‘none’.
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 triggers even though the
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 the navbar and the component below
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 after I press the “Delete from Cart”
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 return before <option value={symbol}>symbol</option> or delete {} wrapped outside
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 Try not to declare unnecessary states. timerCheck state
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 fine, But when I try to copy
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 approach. I’m getting syntax errors trying to access
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 personAmount