topic Re: centerAndZoom() Zooms all the way out in ArcGIS JavaScript Maps SDK Questions

centerAndZoom() Zooms all the way out

EdwardRozum — Thu, 25 Apr 2013 13:28:48 GMT

Using the 3.3 compact javascript library, I have had an issue using center and zoom when my basemap is dynamic. When it is cached, it seems to work correctly. Has anyone seen this before?

var symbol = new esri.symbol.PictureMarkerSymbol('css/images/Pin.png', 32, 32);
    var point = esri.geometry.geographicToWebMercator(new esri.geometry.Point(attributes.long, attributes.lat));
    var graphic = new esri.Graphic(point, symbol, attributes, infoTemplate);

    //Add to map and zoom
    map.graphics.add(graphic);
    map.centerAndZoom(point, 9);
    map.infoWindow.setFeatures([graphic]);

Re: centerAndZoom() Zooms all the way out

ReneRubalcava — Thu, 25 Apr 2013 14:10:52 GMT

The Map::centerAndZoom method behaves differently based on your basemap data.
http://help.arcgis.com/EN/webapi/javascript/arcgis/jsapi/map.html#centerAndZoom
So in reference to the second argument in that function:

When using an ArcGISTiledMapServiceLayer, the map is zoomed to the level specified. When using a DynamicMapServiceLayer, the map is zoomed in or out by the specified factor. For example, use 0.5 to zoom in twice as far and 2.0 to zoom out twice as far.

So when you have a Tiled basemap and you use map.centerAndZoom(point, 9), it will zoom to the 9th level of your maps level of details.
When you have a dynamic basemap and use map.centerAndZoom(point, 9), you are zooming out by a factor of 9, that's global status.

So you'll want to adjust how you use it based on your basemap.

Re: centerAndZoom() Zooms all the way out

EdwardRozum — Thu, 25 Apr 2013 14:14:07 GMT

Ok that makes sense to me. I'll adjust as needed. Thanks for the quick reply. I appreciate the help.

Re: centerAndZoom() Zooms all the way out

JohnGravois — Thu, 25 Apr 2013 16:03:21 GMT

perhaps you could mark Rene's post as an answer?