ArcGIS server9.3 dynamically obtains the current map scale

// ArcGIS server9.3 ADF Javascript

VaR scale = "";

If (Map. _ extent! = NULL)

{

// Obtain the coordinates of the MAP range in the current field of view

VaR Maxx = map. _ extent. _ xmax;

VaR Minx = map. _ extent. _ xmin;

VaR Maxy = map. _ extent. _ Ymax;

VaR miny = map. _ extent. _ ymin;

// Width and height of the map control (image)

VaR imagewidth = map. _ mapsize [0];

VaR imageheight = map. _ mapsize [1];

// Map coordinates of the current map's field of view Center
VaR centerpoint = map. get_center ();
VaR centerx = centerpoint. Coordinates [0];
VaR centery = centerpoint. Coordinates [1];

// DPI of the current screen (points per inch)

VaR DPI = 96;

// Number of points on the current screen in meters

VaR dots_per_m = DPI/2.54*100;

// The width of the map control is half (in meters)

VaR width_size_in_m = (imagewidth/2)/dots_per_m;

Scale = (Maxx-centerx)/width_size_in_m;

}