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How to return QueryTask results?

Anonymous User

How to return QueryTask results? I read the QueryTask returns a promise and this has to be resolved asynchronous way. I looked at other similar posting and one of them said QueryTask uses Deferred, but I am new to Dojo and I couldn't quite understand how Deferred works. I searched references online as much as I can, but unfortunately, I couldn't find one that displays examples similar to my case. I would appreciate any of your help.

Thank you,

Makiko

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Accepted answers

Drew

After looking a little closer i can see you are really asking how to get your buildingAttributes variable out...

So it would be more like this..

 _test:function()
{
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;queryTask.execute(query, addPointsToMap).then(lang.hitch(this, this._onQueryComplete));
&nbsp;&nbsp; 
},

_onQueryComplete:function(results)
{
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;console.debug(results)
}<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

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Anonymous User

Hi Andrew,

Thank you so much!! I need to familiar with lang.hitch. Your answer is very useful!!

Thanks!!

rscheitlin

Line 18 below is where you need to add you console statement.

_getFeatureLayerAttributes<SPAN class="punctuation token">:</SPAN> <SPAN class="keyword token">function</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">{</SPAN>
&nbsp; <SPAN class="comment token">// Add Building Footprint layer</SPAN>
&nbsp; <SPAN class="keyword token">var</SPAN> queryTask <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">QueryTask</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp; url<SPAN class="punctuation token">:</SPAN> <SPAN class="string token"><SPAN>"</SPAN><A class="jive-link-external-small" href="https://community.esri.com/external-link.jspa?url=https%3A%2F%2Fservices.arcgis.com%2F...%2Farcgis%2Fservices%2F...FeatureServer%2F0" target="_blank">https://services.arcgis.com/.../arcgis/services/...FeatureServer/0</A><SPAN>"</SPAN></SPAN>
&nbsp; <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp; <SPAN class="keyword token">var</SPAN> buildingAttributes <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">[</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp; <SPAN class="keyword token">var</SPAN> query <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">Query</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp; query<SPAN class="punctuation token">.</SPAN>where <SPAN class="operator token">=</SPAN> <SPAN class="string token">'Building_Height > -1'</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp; query<SPAN class="punctuation token">.</SPAN>outFields <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">[</SPAN><SPAN class="string token">'OBJECTID'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Building_Height'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Z_Min'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'Z_Max'</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp; 
&nbsp; queryTask<SPAN class="punctuation token">.</SPAN><SPAN class="token function">execute</SPAN><SPAN class="punctuation token">(</SPAN>query<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">.</SPAN><SPAN class="token function">then</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">function</SPAN><SPAN class="punctuation token">(</SPAN>results<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">for</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">var</SPAN> i <SPAN class="operator token">=</SPAN> <SPAN class="number token">0</SPAN><SPAN class="punctuation token">;</SPAN> <SPAN class="number token">1</SPAN> <SPAN class="operator token"><</SPAN> results<SPAN class="punctuation token">.</SPAN>features<SPAN class="punctuation token">.</SPAN>length<SPAN class="punctuation token">;</SPAN> i<SPAN class="operator token">++</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">var</SPAN> feature <SPAN class="operator token">=</SPAN> results<SPAN class="punctuation token">.</SPAN>features<SPAN class="punctuation token">[</SPAN>i<SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>attributes<SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">var</SPAN> attr <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">{</SPAN>OBJECTID<SPAN class="punctuation token">:</SPAN> feature<SPAN class="punctuation token">.</SPAN>OBJECTID<SPAN class="punctuation token">,</SPAN> Building_Height<SPAN class="punctuation token">:</SPAN> feature<SPAN class="punctuation token">.</SPAN>Building_Height<SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Z_Min<SPAN class="punctuation token">:</SPAN> feature<SPAN class="punctuation token">.</SPAN>Z_Min<SPAN class="punctuation token">,</SPAN> Z_Max<SPAN class="punctuation token">:</SPAN> feature<SPAN class="punctuation token">.</SPAN>Z_Max<SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; buildingAttributes<SPAN class="punctuation token">.</SPAN><SPAN class="token function">push</SPAN><SPAN class="punctuation token">(</SPAN>attr<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN> <SPAN class="comment token">// <--- How to return this???</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">}</SPAN>
&nbsp;&nbsp;&nbsp; console<SPAN class="punctuation token">.</SPAN><SPAN class="token function">log</SPAN><SPAN class="punctuation token">(</SPAN>buildingAttributes<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN> <SPAN class="comment token">// <--- Right here is where you need to add it</SPAN>
&nbsp; <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp; <SPAN class="comment token">//console.log(buildingAttributes) ---> This is not printed</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>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

Drew

After looking a little closer i can see you are really asking how to get your buildingAttributes variable out...

So it would be more like this..

 _test:function()
{
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;queryTask.execute(query, addPointsToMap).then(lang.hitch(this, this._onQueryComplete));
&nbsp;&nbsp; 
},

_onQueryComplete:function(results)
{
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;console.debug(results)
}<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

Drew

Your code looks fine (assuming your query is valid) and your results are in the ' results' object..

Do a console.debug on that and you can see the result.

 queryTask.execute(query, addPointsToMap).then(function(results){
 
 console.debug(results)
 
 }));<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

Drew

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