How to create a regular polygon grid in Openlayers?

Question

I am trying to create a grid in my map and do some calculations.

I seen the following links:-

Create regular polygon grid using postgis

Create regular polygon grid inside a polygon using postgis

Here I understood, how to create a polygon grid using postgis spatial query.

Any one, please help me to do the same concept in Openlayers(any client side code).

My arguments are :

1. Bounds value. Example: new OpenLayers.Bounds(77.06173,28.50872,77.40918,28.74567)
2. Distance between the points in the grid. Example : 100

My actual requirements is

1. Create a grid on map.
2. Plot some POINTS.
3. Calculate the number of points in each grid.
4. Get the centroid(x,y) of the grid which have maximum number of points.

I just seen this code..

var points = new OpenLayers.Layer.PointGrid({
 isBaseLayer: true, dx: 15, dy: 15
});
var map = new OpenLayers.Map({
 div: "map",
 layers: [points],
 center: new OpenLayers.LonLat(0, 0),
 zoom: 2
});

Reference: Openlayers Point Grid

My Queries

1. How can I add polygon grid layer.
2. How can I set this layer in a particular bounds/extent.
3. How can I give "select" control to this layer.
4. How can I find out Number of points on a selected grid/polygon.

Note: I am using Openlayers 2.11.