Reverse A Number Using JavaScript

Submitted by razormist on Wednesday, May 20, 2020 - 09:12.

This code will tackle about Reverse A Number using JavaScript. The program will reverse the position of any number that you enter in the form. The logic of this code is that the number is loop one by one and multiplied by base 10. To learn more about this, just follow the steps below.

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.

<!DOCTYPE html>
<html>
        <head>
                <meta charset="UTF-8" name="viewport" content="width=device-width, initial-scale=1"/>
                <link rel="stylesheet" type="text/css" href="css/bootstrap.css"/>
        </head>
<body>
 <nav class="navbar navbar-default">
        <div class="container-fluid">
                <a class="navbar-brand" href="https://sourcecodester.com">Sourcecodester</a>
        </div>
 </nav>
 <div class="col-md-3"></div>
 <div class="col-md-6 well">
        <h3 class="text-primary">Reverse A Number Using JavaScript</h3>
        <hr style="border-top:1px dotted #ccc;"/>
        <div class="col-md-6">
                <div class="form-group">
                        <label>Enter a number</label>
                        <input type="number" min="0" class="form-control" id="digit"/>
                        <br />
                        <center><button class="btn btn-primary" onclick="reverseDigit();">Reverse</button> <button class="btn btn-success" onclick="reset();">Reset</button></center>
                        <br />
                        <div id="result"></div>
                </div>
        </div>
 </div>
<script src="js/script.js"></script>
</body>
</html>

Creating the Script

This code contains the script of the application. The code will reverse a number that is inputted in the form. 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.

function reverseDigit(){
        var reverse=0;
        var input = document.getElementById("digit").value;
        if(input != 0){
                var digit = parseInt(input);
                while(digit){
                        reverse = parseInt(reverse * 10);
                        reverse = parseInt(reverse + (digit%10));
                        digit = parseInt(digit/10);
                }
                document.getElementById("digit").setAttribute('readonly', 'readonly');
                document.getElementById("result").innerHTML = "<center><h3 style='font-size:25px:' class='text-primary'>"+reverse+"</h3></center>";
        }else{
                alert("Please complete the required field!");
        }
        
}
 
function reset(){
        document.getElementById("digit").value = "";
        document.getElementById('digit').removeAttribute('readonly');
        document.getElementById("result").innerHTML = "";
}

There you have it we successfully created a Reverse 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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