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Using the IdentifyTask with a WebMap from AGOL with the 4.x API

TomFlahive

I have an ArcGIS Online WebMap with 5 web services on it and I would like to run an IdentifyTask so that I can obtain a list of all the features that fall under a clicked point. I know that popups provide this same functionality of being able to identify all the features under a clicked point, but I am looking to present the data in a custom sidebar rather than a popup, so I figured using the IdentifyTask is the way to go.

A similar question has been asked and answered (by Kelly Hutchins) on how this might be done with the 3.x API (here), but I am trying to figure out how to do it with the 4.x API.

The part I am stuck on is what to pass in to the IdentifyTask in place of a service URL, as shown in the Esri example:

<SPAN class="comment token">// Create identify task for the specified map service</SPAN>
identifyTask <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">IdentifyTask</SPAN><SPAN class="punctuation token">(</SPAN>mapServiceURL<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

Can the IdentifyTask be used with an AGOL WebMap, and if so, what needs to be done to accomplish that?

Thanks.

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Accepted answers

rscheitlin

Tom,

That would be as simple as:

<SPAN class="comment token">// get the first layer in the collection of operational layers in the WebMap</SPAN>
<SPAN class="comment token">// when the resources in the MapView have loaded.</SPAN>
<SPAN class="keyword token">var</SPAN> featureLayer <SPAN class="operator token">=</SPAN> webmap<SPAN class="punctuation token">.</SPAN>layers<SPAN class="punctuation token">.</SPAN><SPAN class="token function">getItemAt</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>‍‍‍
identifyTask <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">IdentifyTask</SPAN><SPAN class="punctuation token">(</SPAN>featureLayer<SPAN class="punctuation token">.</SPAN>url<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

All comments

rscheitlin

Tom,

Correct one for each service (not each service layer).

TomFlahive

What about the case where you have a WebMap that has web services that may come from different sources (from different servers), so one web service might have 3 individual layers, and another web service from a different source may have 2 individual layers, and so on. In that situation would I need an IdentifyTask for each service?

rscheitlin

Tom,

The thing to look out for is the IdentifyTask is looking for the mapservice url and not an individual layer url (i.e. http //servername/arcgis/rest/services/servicename/MapServer vs http //servername/arcgis/rest/services/servicename/MapServer/1).

TomFlahive

Thanks Robert. I didn't know it would just be a matter of pulling each individual URL. I was thinking there would be a way to pass in all the layers from the WebMap at once.

So if I want to pull the data back for all 5 services on the WebMap, then I would just iterate through the layers and create a separate identify task for each one, correct?

rscheitlin

Tom,

That would be as simple as:

<SPAN class="comment token">// get the first layer in the collection of operational layers in the WebMap</SPAN>
<SPAN class="comment token">// when the resources in the MapView have loaded.</SPAN>
<SPAN class="keyword token">var</SPAN> featureLayer <SPAN class="operator token">=</SPAN> webmap<SPAN class="punctuation token">.</SPAN>layers<SPAN class="punctuation token">.</SPAN><SPAN class="token function">getItemAt</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>‍‍‍
identifyTask <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">IdentifyTask</SPAN><SPAN class="punctuation token">(</SPAN>featureLayer<SPAN class="punctuation token">.</SPAN>url<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

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