<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<script src="https://code.jquery.com/jquery-3.1.0.js"></script>
<title>Number Pyramid - v1</title>
<style id="jsbin-css">.pyramid, td.occupied { border: 1px solid black;}.occupied { background-color: #00ff00;}
</style>
</head>
<body>
<div id="workarea" >
</div>
<script id="jsbin-javascript">
var num=1;
var tablesize=15;
var maxi=(tablesize -1)/2 +1;
$(document).ready(function () {
console.log("starting");
var workarea=$("#workarea");
var table=$("<table class='pyramid'/>");
for (var i = 1; i<=tablesize;i++) {
renderrow(table,(i<=maxi)?i:(tablesize-i+1));
}
console.log("table");
workarea.append(table);
});
function renderrow(table,i) {
var column;
var row=$("<tr/>");
table.append(row);
for (var j=1;j<=tablesize;j++) {
column=$("<td/>");
if (j>maxi-i && j<=tablesize-(maxi-i)) {
column.html(num);
column.addClass("occupied");
num++;
}
row.append(column);
}
}
</script>
</body>
</html>