querying based on map extent

[ArshadAhmed]

Hi,

I'm using a QueryTask that takes a Query and it is querying by the geometry. Basically, I have an event listener that listens for extent change of the US topo map and then takes the map extent and gives it as an input to the Query. But I would like to make sure that the map is zoomed atleast to the state level before I execute the query. How can I find out if the map extent is atleast at the state level or lower and then execute the query? I hope this question is clear.

Thank you,
Arshad.

[FaizanTayyab]

If you know the extent of the state layer, then on each extent change on you can check whether that extent has been reached. If so perform the query.

[ArshadAhmed]

I would like to limit the geometry to the size of a state, so that when a user is panning the map on the state border, it would still return the results. The requirement is the limit the geometry of the query to a size, say the size of the state of virginia. Thank you for your time.

[FaizanTayyab]

Have you looked at:

http://resources.esri.com/help/9.3/arcgisserver/apis/flex/apiref/com/esri/ags/tasks/Query.html

especially at the constants. that might be what you are looking for

SPATIAL_REL_CONTAINS constant

public static const SPATIAL_REL_CONTAINS:String = "esriSpatialRelContains"
Part or all of a feature from feature class 1 is contained within a feature from feature class 2.

SPATIAL_REL_CROSSES constant  

public static const SPATIAL_REL_CROSSES:String = "esriSpatialRelCrosses"
The feature from feature class 1 crosses a feature from feature class 2.

SPATIAL_REL_ENVELOPEINTERSECTS constant  

public static const SPATIAL_REL_ENVELOPEINTERSECTS:String = "esriSpatialRelEnvelopeIntersects"
The envelope of feature class 1 intersects with the envelope of feature class 2.

SPATIAL_REL_INDEXINTERSECTS constant  

public static const SPATIAL_REL_INDEXINTERSECTS:String = "esriSpatialRelIndexIntersects"
The envelope of the query feature class intersects the index entry for the target feature class.

SPATIAL_REL_INTERSECTS constant  

public static const SPATIAL_REL_INTERSECTS:String = "esriSpatialRelIntersects"
Part of a feature from feature class 1 is contained in a feature from feature class 2.

SPATIAL_REL_OVERLAPS constant  

public static const SPATIAL_REL_OVERLAPS:String = "esriSpatialRelOverlaps"
Features from feature class 1 overlap features in feature class 2.

SPATIAL_REL_TOUCHES constant  

public static const SPATIAL_REL_TOUCHES:String = "esriSpatialRelTouches"
The feature from feature class 1 touches the border of a feature from feature class 2.

SPATIAL_REL_WITHIN constant  

public static const SPATIAL_REL_WITHIN:String = "esriSpatialRelWithin"
The feature from feature class 1 is completely enclosed by the feature from feature class 2.