{"id":74359,"date":"2020-01-17T12:28:13","date_gmt":"2020-01-17T06:58:13","guid":{"rendered":"https:\/\/www.vskills.in\/certification\/tutorial\/?p=74359"},"modified":"2024-04-12T14:23:26","modified_gmt":"2024-04-12T08:53:26","slug":"reactjs-events","status":"publish","type":"page","link":"https:\/\/www.vskills.in\/certification\/tutorial\/reactjs-events\/","title":{"rendered":"ReactJS Events"},"content":{"rendered":"

For the\u00a0 Javascript, when an event occurs, a function will be called to execute. But for the\u00a0 React, when an event occurs, a method of\u00a0 Component is called. This example component renders a div that responds to click events.<\/p>\n

var BannerAd = React.createClass({<\/p>\n

onBannerClick: function(evt) {<\/p>\n

\/\/ codez to make the moneys<\/p>\n

},<\/p>\n

render: function() {<\/p>\n

\/\/ Render the div with an onClick prop (value is a function)<\/p>\n

return <div onClick={this.onBannerClick}>Click Me!<\/div>;<\/p>\n

}<\/p>\n

});<\/p>\n

That’s it. You add onXXX to the nodes you want. Notice how the value of the prop is a function.<\/p>\n

Example<\/strong><\/p>\n

This is a simple example where we will only use one component. We are just adding onClick event that will trigger updateState function once the button is clicked.<\/p>\n

App.jsx<\/u><\/p>\n

import React from ‘react’;<\/p>\n

class App extends React.Component {<\/p>\n

constructor(props) {<\/p>\n

super(props);<\/p>\n

this.state = {<\/p>\n

data: ‘Initial data…’<\/p>\n

}<\/p>\n

this.updateState = this.updateState.bind(this);<\/p>\n

};<\/p>\n

updateState() {<\/p>\n

this.setState({data: ‘Data updated…’})<\/p>\n

}<\/p>\n

render() {<\/p>\n

return (<\/p>\n

<div><\/p>\n

<button onClick = {this.updateState}>CLICK<\/button><\/p>\n

<h4>{this.state.data}<\/h4><\/p>\n

<\/div><\/p>\n

);<\/p>\n

}<\/p>\n

}<\/p>\n

export default App;<\/p>\n

main.js<\/u><\/p>\n

import React from ‘react’;<\/p>\n

import ReactDOM from ‘react-dom’;<\/p>\n

import App from ‘.\/App.jsx’;<\/p>\n

ReactDOM.render(<App\/>, document.getElementById(‘app’));<\/p>\n

Arrow Function<\/strong><\/p>\n

With the Javascript ES6 syntax, you can create an\u00a0 arrow function, which is very short and easy-to-understand:<\/p>\n

\/\/ Normal function with parameters<\/p>\n

var myfunc = function(param1, param2)\u00a0 {<\/p>\n

\/\/ Statements<\/p>\n

};<\/p>\n

\/\/ Arrow function with parameters.<\/p>\n

var arrfunc = (param1, param2) => {<\/p>\n

\/\/ Statements<\/p>\n

};<\/p>\n","protected":false},"excerpt":{"rendered":"

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This example component renders a div that responds to click events. var BannerAd = React.createClass({ onBannerClick: function(evt) { \/\/ codez to make the moneys }, render: function()…<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"categories":[8528],"tags":[8598],"class_list":["post-74359","page","type-page","status-publish","hentry","category-reactjs","tag-reactjs-events"],"acf":[],"yoast_head":"\nReactJS Events - Tutorial<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.vskills.in\/certification\/tutorial\/reactjs-events\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ReactJS Events - Tutorial\" \/>\n<meta property=\"og:description\" content=\"For the\u00a0 Javascript, when an event occurs, a function will be called to execute. 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