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JavaScript – Simple Lower And Upper Case Counter

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In this tutorial we will create a Simple Lower And Upper Case Counter using JavaScript. This code can track and detect the available characters that are in Upper and Lower Case. The code use a special regex function to detect the upper and lower case value within a certain word. This 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.

Getting Started:

This is the link for the bootstrap that i used for the layout design

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. <nav class="navbar navbar-default">
  9. <div class="container-fluid">
  10. <a class="navbar-brand" href="<a href="">Sourcecodester</a>
  11. " rel="nofollow">">Sourcecodester</a>
  12. </a> </div>
  13. </nav>
  14. <div class="col-md-3"></div>
  15. <div class="col-md-6 well">
  16. <h3 class="text-primary">JavaScript - Simple Lower And Upper Case Counter</h3>
  17. <hr style="border-top:1px dotted #ccc;"/>
  18. <div class="col-md-3"></div>
  19. <div class="col-md-6">
  20. <div class="form-group">
  21. <label>Enter a word</label>
  22. <input type="text" id="text" class="form-control" />
  23. </div>
  24. <center><button class="btn btn-primary" onclick="startCount();">Count</button> <button class="btn btn-success" onclick="clearAll();">Clear</button></center>
  25. <br />
  26. <div id="result"></div>
  27. </div>
  28. </div>
  29. <script src="js/script.js"></script>
  30. </body >
  31. </html>

Creating the Script

This code contains the script of the application. This code will count the upper and lower case within the given word. 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 clearAll(){
  2. document.getElementById('text').value = "";
  3. document.getElementById('result').innerHTML = "";
  4. }
  6. function startCount() {
  7. var str = document.getElementById('text').value;
  8. var upper=0
  9. var lower=0;
  10. var len=str.length;
  11. for(var i=0;i<len;i++){
  12. if(/[A-Z]/.test(str.charAt(i))){
  13. upper++;
  14. }else{
  15. lower++;
  16. }
  17. }
  19. document.getElementById('result').innerHTML = "<label style='font-size:20px;'>No of UPPER CASE: <span class='text-primary' style='font-size:30px:'>"+upper+"</span></label><br /><label style='font-size:20px;'>No of LOWER CASE: <span class='text-primary' style='font-size:30px:'>"+lower+"</span></label>";
  20. }

There you have it we successfully created a Simple Lower And Upper Case Counter 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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