JavaScript - Get the Square Root of a Number

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In this tutorial we will create a Get the Square Root of a Number using JavaScript. JavaScript is a scripting or programming language that allows you to implement complex things on web pages. It is widely used in designing a stunning website. It is an interpreted programming language that has a capabilities of Object-Oriented. So Let's do the coding...

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. <nav class="navbar navbar-default">
  8. <div class="container-fluid">
  9. <a class="navbar-brand" href="https://sourcecodester.com">Sourcecodester</a>
  10. </div>
  11. </nav>
  12. <div class="col-md-3"></div>
  13. <div class="col-md-6 well">
  14. <h3 class="text-primary">JavaScript - Get the Square Root of a Nunber</h3>
  15. <hr style="border-top:1px dotted #ccc;"/>
  16. <div class="col-md-2"></div>
  17. <div class="col-md-8">
  18. <div class="form-inline">
  19. <label>Enter a number:</label>
  20. <input type="number" id="num" style="width:30%;" class="form-control"/>
  21. <button class="btn btn-primary btn-sm" onclick="getSquareRoot()">Get Square Root</button>
  22. <br /><br />
  23. <div id="result"></div>
  24. </div>
  25. </div>
  26. </div>
  27. <script src="js/script.js"></script>
  28. </body>
  29. </html>

Creating the Script

This code contains the script of the application. This code will automatically calculate the square root of the number. To do this just copy and write these block of codes as shown below inside the text editor and save it as script.js inside the js folder.

  1. function getSquareRoot(){
  2. var num = document.getElementById('num');
  3. if(num.value == ""){
  4. alert("Please enter a number first!");
  5. }else{
  6. var squareRoot = Math.sqrt(parseInt(num.value));
  7. document.getElementById('result').innerHTML = '<div class="alert alert-success">The Square Root of '+num.value+' is '+squareRoot+'</div>';
  8. }
  9. }

There you have it we successfully created a Get the Square Root of a Number 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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