Searching within XX km. radius of Google Maps with markers and Info window

After looking at how to find the location within a Google Map using a textbox, now, let's move on to a slightly more complex application called a "Resturant finder application". This application is a simple but a powerful one. When the user enters a place in the textbox, the application looks for the restaurants within the radius of the specified number of kilometers from the searched location. We will use the Haversine formula to find the circular distance. You can read more about it from here: http://en.wikipedia.org/wiki/Haversine_formula.

Now, let's have a look at the details of how this application looks and how to create it.

Getting ready

After looking at what the application looks like, now let's look at the background knowledge required like the Haversine formula and database structure and data required for this application.

Haversine formula for calculating circular distance

Before getting into the code, first...