JavaScript - Simple Find Your Age App

Submitted by razormist on Wednesday, May 22, 2019 - 16:41.
In this tutorial we will create a Simple Find Your Age App using JavaScript. This code will automatically calculate a person age for you without doing it manually. The code use a Date() function to determine the given birthday and by adding a special formula it will calculate the given date into an exact age of a person. 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 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>
  8.         <nav class="navbar navbar-default">
  9.                 <div class="contriner-fluid">
  10.                         <a class="navbar-brand" href="https://sourcecodester.com">Sourcecodester</a>
  11.                 </div>
  12.         </nav>
  13.         <div class="col-md-3"></div>
  14.         <div class="col-md-6 well">
  15.                 <h3 class="text-primary">JavaScript - Simple Find Your Age App</h3>
  16.                 <hr style="border-top:1px dotted #ccc;"/>
  17.                 <div class="col-md-2"></div>
  18.                 <div class="col-md-8">
  19.                         <center><h2 class="text-primary">FIND YOUR AGE</h2></center>
  20.                         <div class="alert-info" style="padding:20px; border-radius:10px;">
  21.                                 <div class="form-group">
  22.                                         <label>ENTER YOUR BIRTHDATE HERE</label>
  23.                                         <input type="date" class="form-control" id="birthday"/>
  24.                                 </div>
  25.                                 <center><button class="btn btn-primary" onclick="findAge();">GENERATE</button></center>
  26.                                 <div id="result" class="text-primary"></div>
  27.                         </div>
  28.                 </div>
  29.         </div>
  30. <script src="js/script.js"></script>   
  31. </body>
  32. </html>

Creating the Script

This code contains the script of the application. This code will calculate your age 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 findAge() {
  2.         var date = document.getElementById('birthday').value;
  3.        
  4.         if(date === ""){
  5.                 alert("Please complete the required field!");
  6.     }else{
  7.                 var today = new Date();
  8.                 var birthday = new Date(date);
  9.                 var year = 0;
  10.                 if (today.getMonth() < birthday.getMonth()) {
  11.                         year = 1;
  12.                 } else if ((today.getMonth() == birthday.getMonth()) && today.getDate() < birthday.getDate()) {
  13.                         year = 1;
  14.                 }
  15.                 var age = today.getFullYear() - birthday.getFullYear() - year;
  16.                
  17.                 if(age < 0){
  18.                         age = 0;
  19.                 }
  20.                 document.getElementById('result').innerHTML = "<center><h2>Congratulation</h2></center> <center><label>You are now "+age+"yrs old today</label></center>";
  21.         }
  22. }
There you have it we successfully created a Simple Find Your Age App 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!
Tags
Javascript
Bootstrap Application
age

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