Fabonacci series with number of elements by input number



Output here 
<html>
<head>
<title></title>
</head>
<body>
<input type="text" name="t1" id="t1">
<input type="button" value="Submit" onclick="fabonacci_series()">
<div id=d1></div>
<script type="text/javascript">
function fabonacci_series(){
x=document.getElementById("t1").value
x=parseInt(x)
if(Number.isInteger(x)){
str='';
i=0
a=0
b=1
while(i<x){
	element=a+b
	a=b
	b=element
    str=str+ element+","
	i=i+1
}
document.getElementById('d1').innerHTML="Series is :  " + str
}else{
document.getElementById('d1').innerHTML="Enter an Integer  "	
}	
}
</script>
</body>
</html>
isInteger()Checking if input number is integer or not
parseInt()function to convert string to number

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