Prime numbers less than one input number by using JavaScript

Prime numbers are having only two factors, one is 1 and other one is the number itself.

These are the first 5 prime numbers 2, 3, 5, 7, 11

Prime numbers are divisible by exactly two natural numbers.

Enter any number

Output here

<html>
<head>
<title></title>
</head>
<body>
<input type="text" name="t1" id="t1">
<input type="button" value="Submit" onclick="show_prime()">
<div id=d1></div>
<script type="text/javascript">
function show_prime(){
x=document.getElementById("t1").value
x=parseInt(x)
if(Number.isInteger(x)){
str='';
for (i=2;i<x;i++){
  flag=0;
	
  for(j=2;j<i;j++){
	if(i%j == 0){
	flag=1;
	break;
	}
	
  }	
 if(flag==0){
	str= str + i + ","
}

}
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

Next lower value of any decimal number JavaScript Basic JavaScript variable
JavaScript Math Reference

Subhendu Mohapatra

Author & Instructor at plus2net

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Prime Numbers upto the input number

Subhendu Mohapatra