JavaScript - Validate Email Value

Submitted by razormist on Tuesday, December 10, 2019 - 09:08.
In this tutorial we will create a Validate Email Value using JavaScript. This code will dynamically validate the email input when user submit the value in the textbox. The code itself use onclick() to call a function that will validate the email if it can be use as a username. This code is free to use, you can modify it as your own, We will be using JavaScript as a server-side scripting language because It allows greater control of your web page behavior than HTML alone. It is embedded in HTML that responsible to allow user to interact with the computer .

Getting started:

First you have to download bootstrap framework, this is the link for the bootstrap that I used for the layout design https://getbootstrap.com/.

The Main Interface

This code contains the interface of the application. To create this just write these block of code inside the text editor and save this as index.html. 
  1. <!DOCTYPE html>
  2. <html lang="en">
  3. 	<head>
  4. 		<meta charset="UTF-8" name="viewport" content="width=device-width ,initial-scale=1"/>
  5. 		<link rel="stylesheet" type="text/css" href="css/bootstrap.css" />
  6. 	</head>
  7. <body>
  8. 	<head>
  9. 		<nav class="navbar navbar-default">
  10. 			<div class="container-fluid">
  11. 				<a class="navbar-brand" href="https://sourcecodester.com">Sourcecodester</a>
  12. 			</div>
  13. 		</nav>
  14. 	</head>
  15. 	<div class="col-md-3"></div>
  16. 	<div class="col-md-6 well">
  17. 		<h3 class="text-primary">JavaScript - Validate Email Value</h3>
  18. 		<hr style="border-top:1px dotted #ccc;"/>
  19.  
  20. 		<div class="col-md-4">
  21. 			<form>
  22. 				<div class="form-group">
  23. 					<label>Enter email:</label>
  24. 					<input type="text" class="form-control" id="email" />
  25. 				</div>
  26. 				<center><button type="button" class="btn btn-primary" onclick="validateEmail();">Validate</button></center>
  27. 			</form>
  28. 		</div>
  29. 		<div class="col-md-8">
  30. 			<div id="result"></div>
  31. 		</div>
  32. 	</div>
  33. <script src="js/script.js"></script>	
  34. </body>	
  35. </html>

Creating the Script

This code contains the script of the application. This code will automatically validate the email input when the the button is click. To do this just copy and write these block of codes inside the text editor, then save it as script.js inside the js folder. 
  1. function validateEmail(){
  2. 	var email=document.getElementById('email').value;
  3.  
  4. 	if(email==""){
  5. 		alert("Please enter something first!");
  6. 	}else{
  7. 		var emailValidate=/^[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?$/i;
  8. 		if(emailValidate.test(email)){
  9. 			document.getElementById('result').innerHTML="<center><h2 class='text-success'>This email can be use!</h2></center>";
  10. 		}else{
  11. 			document.getElementById('result').innerHTML="<center><h2 class='text-danger'>This email cannot be use!</h2></center>";
  12. 		}
  13. 	}	
  14. }
There you have it we successfully created a Validate Email Value using JavaScript. I hope that this simple tutorial help you to what you are looking for. For more updates and tutorials just kindly visit this site. Enjoy Coding!

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