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JavaScript - Simple String Conversion

In this tutorial we will create a Simple String Conversion using JavaScript. This code will dynamically change the text properties when the user click a button. The code use onclick() function to convert the given text by binding the id of an element in order to change the properties by adding a dot notation toUpperCase() or toLowerCase() on the string. This is a free user-friendly kind of program, you can modify it and apply to your working application. 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

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 href="" class="navbar-brand">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 - Simple String Conversion</h3>
  15. <hr style="border-top:1px dotted #ccc;"/>
  16. <div class="col-md-3">
  17. <button type="button" class="btn btn-primary" onclick="UpperCase()"><span class="glyphicon glyphicon-arrow-up"></span> Uppercase</button>
  18. <br /><br />
  19. <a href="index.html" class="btn btn-success"><span class="glyphicon glyphicon-refresh"></span> Revert</a>
  20. <br /><br />
  21. <button type="button" class="btn btn-danger" onclick="LowerCase()"><span class="glyphicon glyphicon-arrow-down"></span> Lowercase</button>
  22. </div>
  23. <div class="col-md-9">
  24. <form>
  25. <div class="form-group">
  27. <div id="string"/>
  28. There was a forest with many birds and animals. Once, a bull wandering in the forest came upon a cave. Near the cave was a big pond and lush green grass. “This is an ideal place for me to settle down," the bull thought. So, he made the cave his home. Many days passed. The bull became quite healthy, grazing in the meadows. The bull was happy and peaceful living in that cave. He had made many friends in that forest.
  29. </div>
  30. </div>
  31. </form>
  32. </div>
  33. </div>
  34. </body>
  35. <script src="js/script.js"></script>
  36. </html>

Creating the Script

This code contains the script of the application. This code will convert a strong 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 UpperCase(){
  2. var string=document.getElementById('string').innerText;
  3. string= string.toUpperCase();
  4. document.getElementById('string').innerHTML=string;
  5. }
  7. function LowerCase(){
  8. var string=document.getElementById('string').innerText;
  9. string= string.toLowerCase();
  10. document.getElementById('string').innerHTML=string;
  11. }
There you have it we successfully created a Simple String Conversion 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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