HI How to query graphiclayer with polygon ? Thank you.

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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Query Graphic

chengyiwang

How to query graphiclayer with polygon ?

Thank you.

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rscheitlin

Chengyi,

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

<SPAN class="token function">require</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">[</SPAN><SPAN class="string token">"esri/geometry/geometryEngine"</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="keyword token">function</SPAN><SPAN class="punctuation token">(</SPAN>geometryEngine<SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN> 
&nbsp; view<SPAN class="punctuation token">.</SPAN>graphics<SPAN class="punctuation token">.</SPAN><SPAN class="token function">forEach</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">function</SPAN><SPAN class="punctuation token">(</SPAN>gra<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN><SPAN class="punctuation token">(</SPAN>geometryEngine<SPAN class="punctuation token">.</SPAN><SPAN class="token function">intersects</SPAN><SPAN class="punctuation token">(</SPAN>gra<SPAN class="punctuation token">,</SPAN> userDrawnGraphic<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="comment token">/* now do something */</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">}</SPAN>
&nbsp; <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

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chengyiwang

Scheitlin

year,this is I needed. thankyou verymuch.

rscheitlin

Chengyi,

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

<SPAN class="token function">require</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">[</SPAN><SPAN class="string token">"esri/geometry/geometryEngine"</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="keyword token">function</SPAN><SPAN class="punctuation token">(</SPAN>geometryEngine<SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN> 
&nbsp; view<SPAN class="punctuation token">.</SPAN>graphics<SPAN class="punctuation token">.</SPAN><SPAN class="token function">forEach</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">function</SPAN><SPAN class="punctuation token">(</SPAN>gra<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN><SPAN class="punctuation token">(</SPAN>geometryEngine<SPAN class="punctuation token">.</SPAN><SPAN class="token function">intersects</SPAN><SPAN class="punctuation token">(</SPAN>gra<SPAN class="punctuation token">,</SPAN> userDrawnGraphic<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="comment token">/* now do something */</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">}</SPAN>
&nbsp; <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

chengyiwang

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?

rscheitlin

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

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