Tejal,
The number of datapoints that can be displayed in 200px width chart could depends on factors like type of chart, height of the chart, etc. As an ideal scenario, you can render chart with few datapoints (lets say 10-15 datapoints) and then update it based on zoom-level with the help on rangeChanging event. Please take a look at this JSFiddle for an example on the same.
—
Shashi Ranjan
Team CanvasJS
