You can reset m_mapBounds (by setting LatLngBounds to null) before each new 
call for markers is made:

m_mapBounds = new google.maps.LatLngBounds(null);


On Monday, November 15, 2010 3:58:33 PM UTC-5, CSharp wrote:
>
> I currently set fitBounds for sets of markers so that the map can pan and 
> zoom in or out to fit the set of markers on the map.  But in doing that, 
> when the markers are de-selected from the list and the map is zoomed out 
> based on the fitBounds, I noticed that the fitBounds does not zoom back in 
> on one route that is re-selected and shown again.  It seems that the 
> fitBound on a map occurs as a one time event to try and fit all markers on 
> a map, but not repeated again on re-showing of markers.  Is there a way to 
> make the fitBounds for a map to re-zoom in after the map has zoomed out or 
> make the fitBounds zoom in and out according to the sets of markers that 
> are displayed?
>  
> Here's my page:  http://www.mentoreng.com/testing/maps/public/map2.html
>  
>  
>

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