Technology

  Mastering Email Validation in JavaScript with onchange Event: A Comprehensive Guide <input type="email" id="emailInput" onchange="validateEmail()"> <span id="emailError" style="color: red;"></span> <script> function validateEmail() { const emailInput = document.getElementById("emailInput"); const emailError = document.getElementById("emailError"); const emailPattern = /^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$/; if (!emailPattern.test(emailInput.value)) { emailError.textContent = "Invalid email format"; } else { emailError.textContent = ""; } } </script>

  Use EJS as Template Engine in Node.js Use EJS as Template Engine in Node.js Use EJS as Template Engine in Node.js Use EJS as Template Engine in Node.js  /////////////////////////////// //////////////////////////////////////////// command line npm install ejs etemp.js // Set express as Node.js web application // server framework. // To install express before using it as // an application server by using // "npm install express" command. const express = require ( 'express' ); const app = express (); // Set EJS as templating engine app . set ( 'view engine' , 'ejs' ); app . get ( '/' , ( req , res ) => {       // The render method takes the name of the html     // page to be rendered as input.     // This page should be in views folder       // in the root directory.     let data = {         name : 'Akashdeep' ,         hobbies : [ 'playing football' , 'playing che...

///////////////command line install for express////////////// ////////////express.js////////////// const express = require ( 'express' );  npm install express   const app = express ( '' ); app . get ( '' ,( req , res ) => { res . send ( 'Hello,this is home page' ); }); app . get ( '/about' ,( req , res ) => { res . send ( 'hello this is about page' ); }); app . listen ( 5000 ); run with command PS C:\Users\dell\desktop\node-tut> node .\express.js run in web http://localhost:5000/about v ar http = require ( 'http' ),     fs = require ( 'fs' ); fs . readFile ( './index.html' , function ( err , html ) {     if ( err ) {         throw err ;     }           http . createServer ( function ( request , response ) {           response . writeHeader ( 200 , { "Content-Type" : "text/html" });           response . write ( html );     ...