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To set the height of a Div in React to cover the entire screen, set its height to 100vh, for example div style={{height: 100vh}}.../div . When the element's height is set to 100vh, it covers 100% of the viewport height. const App = () = { return...

To handle onChange event on select element in React: Set onChange attribute on select element. Save the value of selected option in state variable. Every time user changes the selected option, update the state variable. import {useState} from react...

Generate option tags for select from array in React: Iterate the array using map() method. In each iteration, return an option element. Pass a unique key attribute to each option element. const App = () = { const arr = [ { value...

To modify the value of a text area using onChange in React: Add an onChange property to the text area, setting it to a function. Store the value of the text area in the state via the useState hook. Update the state every time the user types in the tex...

To call a child function from a parent component in React: Wrap the Child component in forwardRef. Use the useImperativeHandle hook in child to add a function to Child. Use ref to call the Child function from Parent, e.g. childRef.current....

Use the addEventListener method in React's functional components: Set the ref attribute on the element. Use the current attribute on the ref to access the element. Add the event listener in the useEffect hook. import {useRef, useEffect} from react ; c...

The react-hooks/exhaustive-deps rule warns us when dependencies are missing in effect hooks. To get rid of the warning, move the function or variable declaration inside the useEffect hook, remember arrays and objects that change on each render, or dis...

To set a background image with inline styles in React: Set the style attribute on the img element. Set the backgroundColor property in the style object. For example, backgroundImage: url(${MyBackgroundImage}) . // ?️ import the image import M...

Passing data from child to parent in React: Pass a function as a prop to the Child component. Call the function in the Child component and pass the data as an argument. Access the data in the Parent function. import {useState} from react ; funct...

To select a radio button by clicking its text in React: Add a label element for each radio button. The htmlFor attribute of each label should be set to the ID of each radio button. Click the label element to select the radio button. import React , {us...

To check if an element contains a class in React: Set the ref attribute on the element. Use the classList.contains() method on the ref object to check if the class exists. The method returns true if the element's class list contains the class....

Handle onScroll events on div elements in React Handle onScroll events in React: Set the onScroll property on the element to listen for scroll events. Provide an event handling function. Access the event.currentTarget.scrollTop property to get the ver...

To reset a file input in React, set the input's value to null in the handleChange function, e.g. event.target.value = null . Setting the element's value attribute to null resets the file input. const App = () = { const handleFileChange =...

To remove an element from the state array in React: Iterate the array using the filter() method. In each iteration, check if the condition is met. Set the state to the new array returned by the filter method. import {useState} from react ; export defa...

Applying multiple classes to a JSX element works a little differently than in HTML. Let's look at how it works....