With below Javascript code you can easily create diamond pattern up to your desire number.
<html>
<head>
<!-- http://www.codingforums.com/javascript-programming/242014-making-diamond-number-stars-user-inputs.html -->
<title>Diamond Pattern</title>
</head>
<body>
<script type = "text/javascript">
function diamond(n) {
n = parseInt(n,10);
if (n% 2 == 0 ) {
alert( "Odd numbers only!" );
return false;
}
document.write("<pre>");
// top
for(i=1; i<=n; i+=2) {
for (s=0; s<(n-i/2-n/2); s++) { // -n/2 positions diamond pattern at left hand edge of page
document.write(" ");
}
for (j=1; j<=i; j++) {
document.write("*");
}
document.write("<br>");
}
// bottom
for (i=n-2; i>=0; i=i-2) {
for (s=0; s<(n-i/2-n/2); s++) {
document.write(" ");
}
for (j=1; j<=i; j++) {
document.write("*");
}
document.write("<br>");
}
document.write("</pre>");
}
diamond(7);
</script>
</body>
</html>
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