- import PropTypes from 'prop-types'
Navbar.prototype = {
title: PropTypes.string.isRequired
}
- These are used to set datatype, to avoid mistakes
- These are set as default Props value, when props are not passed
Navbar.defaultProps = {
aboutText: 'About'
}
- useState helps us to use class feature, witout creating class in functions
// Declare a new state variable, which we'll call "text"
const [text, setText] = useState('Enter the text here');
- The initial value of text is set to 'Enter the text here', to change the state, we use setText()
- We simiply can't change state value with assign value to text directly.
- Text is state and useState hooks is used,helps to create a state variable.
- onChange event listener comes with an event
value is followed by onChange event.
const handleOnChange = (event)=>{
console.log('On Change')
setText(event.target.value)
}
<div>
<textarea value={text} onChange={handleOnChange}></textarea>
</div>