topic Re: Query Graphic in ArcGIS JavaScript Maps SDK Questions

Query Graphic

chengyiwang — Thu, 28 Dec 2017 03:11:15 GMT

How to query graphiclayer with polygon ?

Thank you.

Re: Query Graphic

RobertScheitlin__GISP — Thu, 28 Dec 2017 03:46:15 GMT

To query a graphics layer you have to loop through the layers graphics and perform your operation on each graphic.

You can use GeometryEngine methods like intersects:

https://developers.arcgis.com/javascript/3/jsapi/esri.geometry.geometryengine-amd.html#intersects

Or if the geometry you want to check is a point geometry, to check if it is inside a polygon then you can use Polygon.contains

https://developers.arcgis.com/javascript/3/jsapi/polygon-amd.html#contains

Re: Query Graphic

chengyiwang — Thu, 28 Dec 2017 06:46:45 GMT

Thank you very much !

Let me explain. Many ploygon are drawn on the graphic when the map is initialized,then I want to draw a new ploygon to search the old ploygon with 4.5 arcgis api for javascript . How to do?

Re: Query Graphic

RobertScheitlin__GISP — Sat, 11 Dec 2021 07:49:28 GMT

Chengyi,

Well then you need to do exactly what I mentioned then.

require(["esri/geometry/geometryEngine"], function(geometryEngine) { 
  view.graphics.forEach(function(gra){
    if(geometryEngine.intersects(gra, userDrawnGraphic)){
      /* now do something */
    }
  });
});
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Re: Query Graphic

chengyiwang — Fri, 29 Dec 2017 07:46:34 GMT

Scheitlin

year,this is I needed. thankyou verymuch.