How To Create Leap Year Checker Using JavaScript

Submitted by alpha_luna on Monday, April 25, 2016 - 16:21.

If you are looking for on How To Create Leap Year Checker Using JavaScript then you are at the right place. This simple program will ask the user to type a year in the textbox then the program will give you a message alert if the given year is a leap year or not. We all know that leap year occurs only every four years. And this year 2016 is a Leap Year. JavaScript Source Code This script will determine the given year if it is a Leap Year or Not.

<script type="text/javascript"> 
function check_year() {
	 var input = document.getElementById("year_input").value;
 var year = parseInt(input);
if (isNaN(year)) {
 alert("Enter a valid year");
document.getElementById("result").innerHTML = "";
document.getElementById("year_input").value="";
document.getElementById("year_input").focus();
}
 else if ((year & 3) == 0 && ((year % 25) != 0 || (year & 15) == 0))
{
document.getElementById("result").innerHTML = 
"The year <b style='color:blue;'>" + year + "</b> is a <b style='color:blue;'>LEAP Year</b>";
}
else {
 document.getElementById("result").innerHTML = 
"The year <b style='color:red;'>" + year + "</b> is <b style='color:red;'>NOT A LEAP Year</b>";
 }
 }
function clear_textbox(){
 document.getElementById("result").innerHTML = "";
 document.getElementById("year_input").value="";
 document.getElementById("year_input").focus();
 
}
</script>

HTML Code This source code where the user types their desired year in the textbox.

<table style="border:blue 1px solid; margin-top: 182px;" width="100%">
	<tr>
		<td colspan="2" style="text-align:center; color:blue;"><h2>Leap Year Checker</h2></td>
	</tr>
	<tr>
		<td style="text-align:center; font-size:18px; font-family:cursive; color:red;">
			Type desired year
			<br />
			<input type="text" id="year_input" style="border:blue 1px solid; width:180px; text-align:center; font-size:18px;" maxlength="4" autofocus>
		</td>
	</tr>
	<tr>
		<td colspan="2" height="15"></td>
	</tr>
	<tr>
		<td colspan="2" style="text-align:center;">
			<input type="submit" value="Check" style="border:blue 1px solid; margin-right:30px; color:blue; background:azure; font-size:18px; width:70px; cursor:pointer;" onclick="check_year()" />     
			<input type="submit" value="Clear" style="border:red 1px solid; color:red; background:azure; font-size:18px; width:70px; cursor:pointer;" onclick="clear_textbox()" />
		</td>
	</tr>
	<tr>
		<td colspan="2" height="20"></td>
	</tr>
</table>
<p id="result"></h1>

Output: This is the output if the user enters an invalid value in the textbox. Invalid

This is the output if the user enters a year and the result is Leap Year.

This is the output if the user enters a year and the result is Not a Leap Year. Not

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How To Create Leap Year Checker Using JavaScript

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