Q241. What is the \_app.js file in Next.js?
In the Next.js Pages Router, **`pages/_app.js`** (or `_app.tsx`) is the top-level root component that wraps every single page in the application during rendering: ### Key...
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Q242. Who created javascript?
JavaScript was created by Brendan Eich in 1995 during his time at Netscape Communications. Initially it was developed under the name `Mocha`, but later the language was o...
Q243. What is the \_document.js file in Next.js?
In the Next.js Pages Router, **`pages/_document.js`** (or `_document.tsx`) allows developers to augment the server-rendered HTML document skeleton (``, ``, ``). ### Key C...
Q244. What is the use of preventDefault method?
The preventDefault() method cancels the event if it is cancelable, meaning that the default action or behaviour that belongs to the event will not occur. For example, pre...
Q245. What is the difference between \_app.js and \_document.js?
While both are root-level files in the Next.js Pages Router, they operate at fundamentally different layers: | Dimension | `_app.js` | `_document.js` | | :--- | :--- | :-...
Q246. What is the use of stopPropagation method?
The stopPropagation method is used to stop the event from bubbling up the event chain. For example, the below nested divs with stopPropagation method prevents default eve...
Q247. What is the \_error.js file in Next.js?
In the Next.js Pages Router, **`pages/_error.js`** (or `_error.tsx`) is a fallback error page rendered whenever an unhandled HTTP exception (such as a 500 internal server...
Q248. What are the steps involved in return false usage?
The return false statement in event handlers performs the below steps, 1. First it stops the browser's default action or behaviour. 2. It prevents the event from propagat...
Q249. How do you create a 404 page in Next.js?
Creating a customized 404 Not Found page is straightforward in both Next.js routers: ### 1. In App Router (`app/` directory): Create **`app/not-found.tsx`**: ```tsx // ap...
Q250. What is BOM?
The Browser Object Model (BOM) allows JavaScript to "talk to" the browser. It consists of the objects navigator, history, screen, location and document which are children...