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Perfect Number Checker in JavaScript

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Submitted on: 9/25/2015 1:34:07 PM
By: Jake R. Pomperada  
Level: Beginner
User Rating: Unrated
Compatibility: JavaScript
Views: 8617
author picture
 
     This program if the given number value by the user is perfect number or not. I added a function for checking invalid entry values. If you have some questions please send me an email at jake.r.pomperada@gmail.com and jakerpomperada@yahoo.com. My mobile number here in the Philippines is 09173084360.

 
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'**************************************
' Name: Perfect Number Checker in JavaScript
' Description:This program if the given number value by the user is perfect number or not. I added a function for checking invalid entry values.
If you have some questions please send me an email at jake.r.pomperada@gmail.com and jakerpomperada@yahoo.com. My mobile number here in the Philippines is 09173084360.
' By: Jake R. Pomperada
'**************************************

<html>
<head>
<style>
body {
 background-color:lightgreen;
 font-family:arial;
 font-size:25px;
 color:blue;
 }
 label {
float: left;
width: 30%;
text-align: left;
margin-right: 1em;
white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;
-o-text-overflow: ellipsis;
}
.form-field-no-caption {
margin-le
input[type="radio"]{
 float:left;
}
</style>
<meta charset="UTF-8">
<title>Prime Number Checker in JavaScript</title>
 
 <script type="text/javascript">
 
function check_prime() {
	 var input = document.getElementById("userInput").value;
 var number = parseInt(input);
if (isNaN(number)) {
alert("Please enter a number.");
document.getElementById("userInput").value="";
document.getElementById("result").innerHTML = "";
document.getElementById("userInput").focus();
}
 
else if (input.length === 0) {
alert("Please enter a valid input");
document.getElementById("userInput").focus();
}
else if (!isNaN(number)) {
if (is_perfect(number)) {
document.getElementById("result").innerHTML = number + " is a PERFECT number.";
}
else {
document.getElementById("result").innerHTML = number + " is NOT a PERFECT number.";
}
}
else {
document.getElementById("result").innerHTML = "Please enter a number.";
}
}
function is_perfect(number) 
{ 
var temp = 0; 
for(var i=1;i<=number/2;i++) 
 { 
 if(number%i === 0) 
 { 
temp += i; 
 } 
 } 
 
 if(temp === number) 
{ 
return true; 
}
 else 
{ 
return false;
} 
 }
function clear_textbox(){
 document.getElementById("result").innerHTML = "";
 document.getElementById("userInput").value="";
 document.getElementById("userInput").focus();
 
}
</script>
</head>
<body>
<h2> Perfect Number Checker in JavaScript </h2>
 Enter a Number 
<input type="text" id="userInput" autofocus value = "" />
<input type="submit" value="Check" 
title="Click here to check if the given number is an perfect number or not."
onclick="check_prime()" />
<input type="submit" value="Clear" 
 title="Click here to clear the text box."
onclick="clear_textbox()" />
	<br><br>
	<p id="result"></h1>
</body>
</html>


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