JavaScript - Check If Number Divisible By 3

Submitted by razormist on Thursday, April 11, 2019 - 22:16.
In this tutorial we will create a Check If Number Divisible By 3 using JavaScript. This code will automatically calculate the divisible of a given number. The code itself use onclick() function to launch a specific method in order to calculate the correct divisible for the user inputted numeric value. This is helpful for the student that needed to know the amount of words in their project. 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>
  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. 	<nav class="navbar navbar-default">
  9. 		<div class="container-fluid">
  10. 			<a class="navbar-brand" href="https://sourcecodester.com">Sourcecodester</a>
  11. 		</div>
  12. 	</nav>
  13. 	<div class="col-md-3"></div>
  14. 	<div class="col-md-6 well">
  15. 		<h3 class="text-primary">JavaScript - Check If Number Divisible By 3</h3>
  16. 		<hr style="border-top:1px dotted #ccc;"/>
  17. 		<div class="col-md-3"></div>
  18. 		<div class="col-md-6">
  19. 			<div class="form-group">
  20. 				<label>Enter a number</label>
  21. 				<input type="number" class="form-control" id="digit"/>
  22. 				<br />
  23. 				<center><button class="btn btn-primary" onclick="calculate();">Calculate</button></center>
  24. 			</div>
  25. 			<br />
  26. 			<div id="result"></div>
  27. 		</div>
  28. 	</div>
  29.  
  30. <script src="js/script.js"></script> 
  31. </body>
  32. </html>

Creating the Script

This code contains the script of the application. This code will calculate the given number to find the divisible value when the button is clicked. 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 calculate(){
  2. 	var number = document.getElementById('digit').value;
  3. 	if(number % 3 == 0){
  4. 		document.getElementById('result').innerHTML = "<center><label>The number <span style='font-size:25px;' class='text-danger'>"+number+"</span> is divisible by 3</label></center>";
  5. 	}else{
  6. 		document.getElementById('result').innerHTML = "<center><label>The number <span style='font-size:25px;' class='text-danger'>"+number+"</span> is not divisible by 3</label></center>";
  7. 	}
  8. }
There you have it we successfully created a Check If Number Divisible By 3 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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