topic Re: Set zoom limit - maximal minimal in ArcGIS JavaScript Maps SDK Questions

Set zoom limit - maximal minimal

MarcelKleinmann — Tue, 09 Nov 2010 06:05:24 GMT

Given a map containing dynamic layers, how does one control the map scales upper and lower limit?

From what I have seen a map that only contains ArcGISDynamicMapServiceLayers can scale from epsilon to infinity but as soon as tiled layers are present the levels of detail (lods) set the scales and with this the limits.
How can I constrain the zoom then, when there are no tiled layers in my map?

Where does one find this sort of information? The online documentation and samples that I know of do not provide such detailed information.

Cheers

Re: Set zoom limit - maximal minimal

JianHuang — Wed, 10 Nov 2010 17:36:05 GMT

Hope the concept of this sample helps.
http://resources.esri.com/arcgisserver/apis/javascript/arcgis/index.cfm?fa=codeGalleryDetails&scriptID=16956

Re: Set zoom limit - maximal minimal

MarcelKleinmann — Fri, 12 Nov 2010 05:09:59 GMT

Hi Jian,

thank you for your example.

Though your handling still bases on the onExtentChange event:

dojo.connect(map, "onExtentChange", YOURFUNCTION);

I did the same, not to constrain the extent but the zoom. The problem is, each time the user zooms in by mousewheel, there will be:

- a zoom in beyond the allowed zoom limit
- a onExtentChange event
- my function, zooming back to the allowed zoom level

I would like to directly access the zoom function of the API to change it. Is this possible?

Cheers

Re: Set zoom limit - maximal minimal

DaveHighness — Tue, 16 Nov 2010 17:01:58 GMT

Hi, I would like to do the oposite of this. In my app I load the "World Street Map" tiled map service from ArcGIS Online and my ArcServer service above it. I need to be able to zoom in further on my service than the "World Street Map" will allow. I would like to remove the "World Street Map" at the higher scales and add it again when the scale zooms back out. I can do this easy enough using the onExtentChange event but the Javascript API will still not let me zoom in any further than allowed by the tiled map service. How do I remove this limit when I remove the "World Street Map"? If never load the "World Street Map" I do not have this problem. I can zoom in at will.

Thanks, Dave

Re: Set zoom limit - maximal minimal

MarcelKleinmann — Wed, 17 Nov 2010 06:23:25 GMT

Hi Dave,

I didn't work with tiled layers yet. Isn't it possible to zoom beyond the limit, by setting the zoom steps through lods? If this doesn't work out, try a workaround by adding another (empty) tiled layer, which allows the zoom in.

Cheers

Re: Set zoom limit - maximal minimal

MarcelKleinmann — Fri, 19 Nov 2010 08:44:31 GMT

Has any one another idea for the initial zoom problem?

Re: Set zoom limit - maximal minimal

AxelSchaefer — Mon, 22 Nov 2010 17:33:24 GMT

...

Grab it as an esri.layers.ArcGISDynamicMapServiceLayer.