Prime Numbers upto the input 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


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