topic Re: Perform query based in existing map graphics in ArcGIS JavaScript Maps SDK Questions

Perform query based in existing map graphics

TiagoRibeiro — Mon, 28 Nov 2011 15:41:18 GMT

Hi there,

I'm trying to create a function that performs a query on the map based in the current map.graphics.
Is there an easy way to add map.graphics to the geometry parameter, besides going trough the map.graphics.graphics array to find the extents?

Thanks

Re: Perform query based in existing map graphics

HemingZhu — Sat, 11 Dec 2021 13:23:26 GMT

Hi there,

I'm trying to create a function that performs a query on the map based in the current map.graphics.
Is there an easy way to add map.graphics to the geometry parameter, besides going trough the map.graphics.graphics array to find the extents?

Thanks

geometries = esri.getGeometries(map.graphics);
geometryService.union(geometries, function(geometry){
        query.geometry =geometry;
        ...
});

Re: Perform query based in existing map graphics

TiagoRibeiro — Sat, 11 Dec 2021 13:23:28 GMT

geometries = esri.getGeometries(map.graphics);
geometryService.union(geometries, function(geometry){
        query.geometry =geometry;
        ...
});

Thanks for your response, but I accomplished the some thing (I think) using:

esri.graphicsExtent(map.graphics.graphics)

It seems to work fine, but can you tell me the difference between this solutions and yours?

Re: Perform query based in existing map graphics

HemingZhu — Mon, 28 Nov 2011 17:20:06 GMT

Thanks for your response, but I accomplished the some thing (I think) using:
esri.graphicsExtent(map.graphics.graphics)
It seems to work fine, but can you tell me the difference between this solutions and yours?

your approach used the extent of map.graphics.graphics as query.geometry while mine merged map.graphics.graphics into one geometry and used that geometry as query.geometry.

Re: Perform query based in existing map graphics

TiagoRibeiro — Tue, 29 Nov 2011 10:19:13 GMT

your approach used the extent of map.graphics.graphics as query.geometry while mine merged map.graphics.graphics into one geometry and used that geometry as query.geometry.

Ok, I understood that part, but I was wondering what's the best approach, and if the final result will be the same.

Re: Perform query based in existing map graphics

HemingZhu — Tue, 29 Nov 2011 13:58:04 GMT

Ok, I understood that part, but I was wondering what's the best approach, and if the final result will be the same.

The result may or may not be the same. For example a point which may be within the extend of a polygon may actually outside that polygon.

Re: Perform query based in existing map graphics

TiagoRibeiro — Tue, 29 Nov 2011 14:13:25 GMT

The result may or may not be the same. For example a point which may be within the extend of a polygon may actually outside that polygon.

That's what I thought. As I see it for better performance use the extents, because you don't need the geometry service, and for accuracy use the join (right?).
By the way, is there a way to perform geometry operations (buffer, intersects, joins, etc) on the client side, without using the geometry services?