Progressive data rendering with zoom event
Large data sets may well include more data than can be presented, given the pixel size of the display. When a user zooms in on the data, more information would then be needed to display detail data.
A progressive mechanism would be useful to allow more detail to be requested and sent to the client via an ajax call, triggered from a zoom event. This progressive rendering might show a lag on zoom, but in some cases this lag would be preferred to a long delay for initial data display for very large data sets. It might also perform better with large data sets.
Saiful Islam commented
This is excellent idea need to apply.
YOU'RE RIGHT !