JavaScript - Generate Even And Odd Numbers

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In this tutorial we will create a Generate Even And Odd Numbers using JavaScript. This code will use onclick() to call a specific function that can separate the given numbers into two parts the even and odd number by using conditional statement when looping the numbers. You can apply this script to your code, it is a user-friendly program feel free to modify it.

We will use JavaScript to add some new feature to the website interface by actually written into an HTML page. It is what gives your page a different interactive elements and animation that engage a user.
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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="<a href="https://sourcecodester.com">Sourcecodester</a>
  10. " rel="nofollow">https://sourcecodester.com">Sourcecodester</a>
  11. </a> </div>
  12. </nav>
  13. <div class="col-md-3"></div>
  14. <div class="col-md-6 well">
  15. <h3 class="text-primary">JavaScript - Generate Even And Odd Numbers</h3>
  16. <hr style="border-top:1px dotted #ccc;"/>
  17. <div class="col-md-3">
  18. <form>
  19. <div class="form-group">
  20. <label>Enter a number</label>
  21. <input type="number" id="num" class="form-control"/>
  22. </div>
  23. <center><button type="button" onclick="generateNumbers();" class="btn btn-primary">Generate Number</button></center>
  24. </form>
  25. </div>
  26. <div class="col-md-9">
  27. <center><h4 class="text-info">Numbers</h4></center>
  28. <div class="col-md-6">
  29. <h4 class="text-info">EVEN</h4>
  30. <div id="even"></div>
  31. </div>
  32. <div class="col-md-6">
  33. <h4 class="text-info">ODD</h4>
  34. <div id="odd"></div>
  35. </div>
  36. </div>
  37. </div>
  38. <script src="js/script.js"></script>
  39. </body>
  40. </html>

Creating the Script

This code contains the script of the application. This code will generate even and odd numbers when the button is clicked. 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 directory

  1. function generateNumbers(){
  2. var number=document.getElementById('num').value;
  3.  
  4. if(number == "" || number <= 0){
  5. alert('Please enter something first');
  6. }else{
  7. var num=parseInt(number);
  8. var even=[];
  9. var odd=[];
  10. for(var i=1; i<=num; i++){
  11. if (i % 2 == 0){
  12. even.push(i);
  13. }else{
  14. odd.push(i);
  15. }
  16.  
  17. }
  18.  
  19. document.getElementById('even').innerHTML=even.join(' ,');
  20. document.getElementById('odd').innerHTML=odd.join(' ,');
  21.  
  22. }
  23. }

There you have it we successfully created a Generate Even And Odd Numbers 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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