Q:

Setting Min Zoom without base map using ArcGIS API for JavaScript?

How do I set min zoom for map without defining base map(User can't zoom out beyond that label)?
Set min zoom with base map is working fine.
For example:
map = new Map("map", {
                        basemap : "streets",
                        center : [ 78.00, 21.00 ],
                        sliderPosition : "top-right",
                        maxZoom : 10,
                        minZoom: 5,                             
                    });

But when i am trying minZoom without base map, it's not working
basemap : ""

My main motive is use the min zoom option without base map.
Something like this in the ArcGIS API for JavaScript Sandbox.

A:

You can set minScale instead.  The layer in your example has a Min Scale of 500000000, so you could set the the map's minScale to a smaller value which will disable zooming out beyond that scale.
map = new Map("map", {                            
    center : [ 78.00, 21.00 ],
    sliderPosition : "top-right",
    minScale: 490000000                       
});

You will notice when you don't have a basemap, the map's zoom property is -1, since the zoom value corresponds to the various levels of the basemap. However, the map's scale value increases when you zoom out, and decreases when you zoom in.  

