Draw route between two locations on map in HTML

I have insert static map (image of map) of United States. User will select source and destination by clicking on map and when it click show route button,开发者_高级运维 route is being drawn on the map. How will I draw route between selected locations?

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Your best bet to draw upon the image is to use a canvas element.

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Seems to me that a sensible option would be to use the Google Maps API to get you actual "route" data (as in which roads to take, distances etc):

Google Maps JavaScript API - Routes and steps