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Is there any way to get a count of the number of features in a FeatureLayer?

JohnAdams

I have a FeatureLayer map service from which I would like to get a count of the number of features. I would have thought such a thing would be a basic kind of functionality, but looking through the Javascript API for FeatureLayer, I can find nothing that looks like it does that. Unless I'm missing something?

What I would like to do is something like this:

var myLayer = new FeatureLayer("service url here with maybe a filter");

var count = myLayer.count;

Seems to be a basic thing to have - right? I guess not?

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RobertScheitlin__GISP

John,

You just do a queryCount.

FeatureLayer | API Reference | ArcGIS API for JavaScript 3.18 | queryCount

and use a where clause like 1=1

JohnAdams

Yeah I just discovered that. Not really what I want, since the feature layers I'm using have already been created using a filter/query, so it's pretty redundant to have to ask the exact same query again on a layer that's already been created using that same query. Would be much simpler to just have something like myLayer.count.

I noticed the 4.1 API has the query as an optional input, but unfortunately I have to use 3.18. I guess it'll have to do.

RobertScheitlin__GISP

John,

If you already have a definition query applied and the number of features returned is less then the max feature count then you can just use this simple line of code:

<SPAN class="keyword token">var</SPAN> len <SPAN class="operator token">=</SPAN> FeatureLayer<SPAN class="punctuation token">.</SPAN>graphics<SPAN class="punctuation token">.</SPAN>length<SPAN class="punctuation token">;</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN></SPAN>

You need to be sure that the featurelayer is fully loaded before calling this line though

JohnAdams

Thanks. But when I try that is always returns 0, even though I know there should be either 2 or 5, depending on one of my inputs. Got the other one to work using those same inputs.

I'll play around with it and see if I can get it to work.

RobertScheitlin__GISP

John,

You have to ensure that the layer is done loading and has the definition query applied:

on<SPAN class="punctuation token">.</SPAN><SPAN class="token function">once</SPAN><SPAN class="punctuation token">(</SPAN>FeatureLayer<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"update-end"</SPAN><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;&nbsp; <SPAN class="keyword token">var</SPAN> len <SPAN class="operator token">=</SPAN> FeatureLayer<SPAN class="punctuation token">.</SPAN>graphics<SPAN class="punctuation token">.</SPAN>length<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>

JohnAdams

OK, follow-up to everything here. I'm using the query method - is there any way to get it to return a value? I want to do something like:

var query = new Query();
query.where = "Zip = '" + SelectedZip + "'";
featLayer.queryCount(query, function(count) {
}, newfunction(count));

Then later in my code ...

function newfunction(number)

{

return number;

}

... so that I have access to whatever "count" was. Or maybe:

var query = new Query();
query.where = "Zip = '" + SelectedZip + "'";
featLayer.queryCount(query, function(count) {

var num = count;
}, newfunction(num));

... and then again, same "newfunction" as above. I've also tried something like:

var query = new Query();
query.where = "Zip = '" + SelectedZip + "'";
var num = featLayer.queryCount(query, function(count) {

return count;
});

So that, once again, I can access "count" elsewhere. Whenever I try to assign a variable within the queryCount function, it disappears into thin air after the function is over and done with, even if I declared that variable globally.

Hope that made sense.

JohnAdams

Almost forgot ... I realize I have double-inner function calls and thus need to do a double-return, so I've also tried something like this:

var query = new Query();
query.where = "Zip = '" + SelectedZip + "'";

var num;
num = featLayer.queryCount(query, num = function(count) {
return count;
} return count;);

And variations thereof. But I can't do the "num = function(count)" without getting a syntax error.

RobertScheitlin__GISP

John,

Here is a sample of how I recommended to get the count using the FeatureLayer graphics length:

<SPAN class="operator token"><</SPAN><SPAN class="operator token">!</SPAN>DOCTYPE html<SPAN class="operator token">></SPAN>
<SPAN class="operator token"><</SPAN>html<SPAN class="operator token">></SPAN>
<SPAN class="operator token"><</SPAN>head<SPAN class="operator token">></SPAN>
<SPAN class="operator token"><</SPAN>meta charset<SPAN class="operator token">=</SPAN><SPAN class="string token">"utf-8"</SPAN><SPAN class="operator token">></SPAN>
<SPAN class="operator token"><</SPAN>meta name<SPAN class="operator token">=</SPAN><SPAN class="string token">"viewport"</SPAN> content<SPAN class="operator token">=</SPAN><SPAN class="string token">"initial-scale=1,maximum-scale=1,user-scalable=no"</SPAN><SPAN class="operator token">></SPAN>
<SPAN class="operator token"><</SPAN>title<SPAN class="operator token">></SPAN>FeatureLayer<SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>title<SPAN class="operator token">></SPAN>

<SPAN class="operator token"><</SPAN>link rel<SPAN class="operator token">=</SPAN><SPAN class="string token">"stylesheet"</SPAN> href<SPAN class="operator 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%2Fjs.arcgis.com%2F3.18%2Fesri%2Fcss%2Fesri.css" target="_blank">https://js.arcgis.com/3.18/esri/css/esri.css</A><SPAN>"</SPAN></SPAN><SPAN class="operator token">></SPAN>
<SPAN class="operator token"><</SPAN>script src<SPAN class="operator 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%2Fjs.arcgis.com%2F3.18%2F" target="_blank">https://js.arcgis.com/3.18/</A><SPAN>"</SPAN></SPAN><SPAN class="operator token">></SPAN><SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>script<SPAN class="operator token">></SPAN>

<SPAN class="operator token"><</SPAN>style<SPAN class="operator token">></SPAN>
html<SPAN class="punctuation token">,</SPAN> body<SPAN class="punctuation token">,</SPAN> #map <SPAN class="punctuation token">{</SPAN>
&nbsp; padding<SPAN class="punctuation token">:</SPAN> <SPAN class="number token">0</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp; margin<SPAN class="punctuation token">:</SPAN> <SPAN class="number token">0</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp; height<SPAN class="punctuation token">:</SPAN> <SPAN class="number token">100</SPAN><SPAN class="operator token">%</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp; width<SPAN class="punctuation token">:</SPAN> <SPAN class="number token">100</SPAN><SPAN class="operator token">%</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="punctuation token">}</SPAN>
<SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>style<SPAN class="operator token">></SPAN>

<SPAN class="operator token"><</SPAN>script<SPAN class="operator token">></SPAN>
<SPAN class="token function">require</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">[</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"esri/map"</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"esri/layers/FeatureLayer"</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"dojo/on"</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"dojo/domReady!"</SPAN>
&nbsp; <SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp; <SPAN class="keyword token">function</SPAN><SPAN class="punctuation token">(</SPAN>
&nbsp;&nbsp;&nbsp; Map<SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp; FeatureLayer<SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp; on
&nbsp; <SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">var</SPAN> map <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">Map</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"map"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; basemap<SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"hybrid"</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; center<SPAN class="punctuation token">:</SPAN> <SPAN class="punctuation token">[</SPAN><SPAN class="operator token">-</SPAN><SPAN class="number token">82.44109</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">35.6122</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; zoom<SPAN class="punctuation token">:</SPAN> <SPAN class="number token">17</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="comment token">// Carbon storage of trees in Warren Wilson College.</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">var</SPAN> featureLayer <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">FeatureLayer</SPAN><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%2FV6ZHFr6zdgNZuVG0%2Farcgis%2Frest%2Fservices%2FLandscape_Trees%2FFeatureServer%2F0" target="_blank">https://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/Landscape_Trees/FeatureServer/0</A><SPAN>"</SPAN></SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="string token">"outFields"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="punctuation token">[</SPAN><SPAN class="string token">"*"</SPAN><SPAN class="punctuation token">]</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; featureLayer<SPAN class="punctuation token">.</SPAN><SPAN class="token function">setDefinitionExpression</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"Tree_Age > 5"</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; map<SPAN class="punctuation token">.</SPAN><SPAN class="token function">addLayer</SPAN><SPAN class="punctuation token">(</SPAN>featureLayer<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; on<SPAN class="punctuation token">.</SPAN><SPAN class="token function">once</SPAN><SPAN class="punctuation token">(</SPAN>featureLayer<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"update-end"</SPAN><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;&nbsp;&nbsp;&nbsp;&nbsp; console<SPAN class="punctuation token">.</SPAN><SPAN class="token function">info</SPAN><SPAN class="punctuation token">(</SPAN>featureLayer<SPAN class="punctuation token">.</SPAN>graphics<SPAN class="punctuation token">.</SPAN>length<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp; <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>script<SPAN class="operator token">></SPAN>
<SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>head<SPAN class="operator token">></SPAN>

<SPAN class="operator token"><</SPAN>body<SPAN class="operator token">></SPAN>
&nbsp; <SPAN class="operator token"><</SPAN>div id<SPAN class="operator token">=</SPAN><SPAN class="string token">"map"</SPAN><SPAN class="operator token">></SPAN><SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>div<SPAN class="operator token">></SPAN>
<SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>body<SPAN class="operator token">></SPAN>

<SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>html<SPAN class="operator 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>‍</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><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>

And here is a sample for doing it using the query from a function:

<SPAN class="operator token"><</SPAN><SPAN class="operator token">!</SPAN>DOCTYPE html<SPAN class="operator token">></SPAN>
<SPAN class="operator token"><</SPAN>html<SPAN class="operator token">></SPAN>
<SPAN class="operator token"><</SPAN>head<SPAN class="operator token">></SPAN>
<SPAN class="operator token"><</SPAN>meta charset<SPAN class="operator token">=</SPAN><SPAN class="string token">"utf-8"</SPAN><SPAN class="operator token">></SPAN>
<SPAN class="operator token"><</SPAN>meta name<SPAN class="operator token">=</SPAN><SPAN class="string token">"viewport"</SPAN> content<SPAN class="operator token">=</SPAN><SPAN class="string token">"initial-scale=1,maximum-scale=1,user-scalable=no"</SPAN><SPAN class="operator token">></SPAN>
<SPAN class="operator token"><</SPAN>title<SPAN class="operator token">></SPAN>FeatureLayer<SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>title<SPAN class="operator token">></SPAN>

<SPAN class="operator token"><</SPAN>link rel<SPAN class="operator token">=</SPAN><SPAN class="string token">"stylesheet"</SPAN> href<SPAN class="operator 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%2Fjs.arcgis.com%2F3.18%2Fdijit%2Fthemes%2Fclaro%2Fclaro.css" target="_blank">https://js.arcgis.com/3.18/dijit/themes/claro/claro.css</A><SPAN>"</SPAN></SPAN><SPAN class="operator token">></SPAN>
<SPAN class="operator token"><</SPAN>link rel<SPAN class="operator token">=</SPAN><SPAN class="string token">"stylesheet"</SPAN> href<SPAN class="operator 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%2Fjs.arcgis.com%2F3.18%2Fesri%2Fcss%2Fesri.css" target="_blank">https://js.arcgis.com/3.18/esri/css/esri.css</A><SPAN>"</SPAN></SPAN><SPAN class="operator token">></SPAN>
<SPAN class="operator token"><</SPAN>script src<SPAN class="operator 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%2Fjs.arcgis.com%2F3.18%2F" target="_blank">https://js.arcgis.com/3.18/</A><SPAN>"</SPAN></SPAN><SPAN class="operator token">></SPAN><SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>script<SPAN class="operator token">></SPAN>

<SPAN class="operator token"><</SPAN>style<SPAN class="operator token">></SPAN>
html<SPAN class="punctuation token">,</SPAN> body<SPAN class="punctuation token">,</SPAN> #map <SPAN class="punctuation token">{</SPAN>
&nbsp; padding<SPAN class="punctuation token">:</SPAN> <SPAN class="number token">0</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp; margin<SPAN class="punctuation token">:</SPAN> <SPAN class="number token">0</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp; height<SPAN class="punctuation token">:</SPAN> <SPAN class="number token">100</SPAN><SPAN class="operator token">%</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp; width<SPAN class="punctuation token">:</SPAN> <SPAN class="number token">100</SPAN><SPAN class="operator token">%</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="punctuation token">}</SPAN>
<SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>style<SPAN class="operator token">></SPAN>

<SPAN class="operator token"><</SPAN>script<SPAN class="operator token">></SPAN>
<SPAN class="keyword token">var</SPAN> featCnt<SPAN class="punctuation token">;</SPAN>
<SPAN class="token function">require</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">[</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"esri/map"</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"esri/layers/FeatureLayer"</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"dojo/on"</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"esri/tasks/query"</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"dojo/parser"</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"dojo/dom"</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"dojo/Deferred"</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"dijit/form/Button"</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"dojo/domReady!"</SPAN>
&nbsp; <SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp; <SPAN class="keyword token">function</SPAN><SPAN class="punctuation token">(</SPAN>
&nbsp;&nbsp;&nbsp; Map<SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp; FeatureLayer<SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp; on<SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp; Query<SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp; parser<SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp; dom<SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp; Deferred
&nbsp; <SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp; parser<SPAN class="punctuation token">.</SPAN><SPAN class="token function">parse</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">var</SPAN> map <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">Map</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"map"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; basemap<SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"hybrid"</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; center<SPAN class="punctuation token">:</SPAN> <SPAN class="punctuation token">[</SPAN><SPAN class="operator token">-</SPAN><SPAN class="number token">82.44109</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">35.6122</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; zoom<SPAN class="punctuation token">:</SPAN> <SPAN class="number token">17</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="comment token">// Carbon storage of trees in Warren Wilson College.</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">var</SPAN> featureLayer <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">FeatureLayer</SPAN><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%2FV6ZHFr6zdgNZuVG0%2Farcgis%2Frest%2Fservices%2FLandscape_Trees%2FFeatureServer%2F0" target="_blank">https://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/Landscape_Trees/FeatureServer/0</A><SPAN>"</SPAN></SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="string token">"outFields"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="punctuation token">[</SPAN><SPAN class="string token">"*"</SPAN><SPAN class="punctuation token">]</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; featureLayer<SPAN class="punctuation token">.</SPAN><SPAN class="token function">setDefinitionExpression</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"Tree_Age > 5"</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; map<SPAN class="punctuation token">.</SPAN><SPAN class="token function">addLayer</SPAN><SPAN class="punctuation token">(</SPAN>featureLayer<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="comment token">// on.once(featureLayer, "update-end", function() {</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="comment token">//&nbsp;&nbsp; console.info(featureLayer.graphics.length);</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="comment token">// })</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="token function">on</SPAN><SPAN class="punctuation token">(</SPAN>dijit<SPAN class="punctuation token">.</SPAN><SPAN class="token function">byId</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"cntBtn"</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"click"</SPAN><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;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="token function">getFeatureCnt</SPAN><SPAN class="punctuation token">(</SPAN><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>evt<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="token function">alert</SPAN><SPAN class="punctuation token">(</SPAN>evt<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">,</SPAN><SPAN class="keyword token">this</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">function</SPAN> <SPAN class="token function">getFeatureCnt</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&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;&nbsp;&nbsp;&nbsp;&nbsp; query<SPAN class="punctuation token">.</SPAN>where <SPAN class="operator token">=</SPAN> featureLayer<SPAN class="punctuation token">.</SPAN><SPAN class="token function">getDefinitionExpression</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">var</SPAN> def <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">Deferred</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; featureLayer<SPAN class="punctuation token">.</SPAN><SPAN class="token function">queryCount</SPAN><SPAN class="punctuation token">(</SPAN>query<SPAN class="punctuation token">,</SPAN> <SPAN class="keyword token">function</SPAN><SPAN class="punctuation token">(</SPAN>count<SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; def<SPAN class="punctuation token">.</SPAN><SPAN class="token function">resolve</SPAN><SPAN class="punctuation token">(</SPAN>count<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN> def<SPAN class="punctuation token">;</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="operator token"><</SPAN><SPAN class="operator token">/</SPAN>script<SPAN class="operator token">></SPAN>
<SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>head<SPAN class="operator token">></SPAN>

<SPAN class="operator token"><</SPAN>body <SPAN class="keyword token">class</SPAN><SPAN class="operator token">=</SPAN><SPAN class="string token">"claro"</SPAN><SPAN class="operator token">></SPAN>
&nbsp; <SPAN class="operator token"><</SPAN>div id<SPAN class="operator token">=</SPAN><SPAN class="string token">"map"</SPAN><SPAN class="operator token">></SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="operator token"><</SPAN>button data<SPAN class="operator token">-</SPAN>dojo<SPAN class="operator token">-</SPAN>type<SPAN class="operator token">=</SPAN><SPAN class="string token">"dijit/form/Button"</SPAN> type<SPAN class="operator token">=</SPAN><SPAN class="string token">"button"</SPAN> id<SPAN class="operator token">=</SPAN><SPAN class="string token">"cntBtn"</SPAN><SPAN class="operator token">></SPAN>Get Count<SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>button<SPAN class="operator token">></SPAN>
&nbsp; <SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>div<SPAN class="operator token">></SPAN>
<SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>body<SPAN class="operator token">></SPAN>

<SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>html<SPAN class="operator 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>‍</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><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>‍</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>

RobertScheitlin__GISP

Or using a global var:

<SPAN class="operator token"><</SPAN><SPAN class="operator token">!</SPAN>DOCTYPE html<SPAN class="operator token">></SPAN>
<SPAN class="operator token"><</SPAN>html<SPAN class="operator token">></SPAN>
<SPAN class="operator token"><</SPAN>head<SPAN class="operator token">></SPAN>
<SPAN class="operator token"><</SPAN>meta charset<SPAN class="operator token">=</SPAN><SPAN class="string token">"utf-8"</SPAN><SPAN class="operator token">></SPAN>
<SPAN class="operator token"><</SPAN>meta name<SPAN class="operator token">=</SPAN><SPAN class="string token">"viewport"</SPAN> content<SPAN class="operator token">=</SPAN><SPAN class="string token">"initial-scale=1,maximum-scale=1,user-scalable=no"</SPAN><SPAN class="operator token">></SPAN>
<SPAN class="operator token"><</SPAN>title<SPAN class="operator token">></SPAN>FeatureLayer<SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>title<SPAN class="operator token">></SPAN>

<SPAN class="operator token"><</SPAN>link rel<SPAN class="operator token">=</SPAN><SPAN class="string token">"stylesheet"</SPAN> href<SPAN class="operator 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%2Fjs.arcgis.com%2F3.18%2Fdijit%2Fthemes%2Fclaro%2Fclaro.css" target="_blank">https://js.arcgis.com/3.18/dijit/themes/claro/claro.css</A><SPAN>"</SPAN></SPAN><SPAN class="operator token">></SPAN>
<SPAN class="operator token"><</SPAN>link rel<SPAN class="operator token">=</SPAN><SPAN class="string token">"stylesheet"</SPAN> href<SPAN class="operator 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%2Fjs.arcgis.com%2F3.18%2Fesri%2Fcss%2Fesri.css" target="_blank">https://js.arcgis.com/3.18/esri/css/esri.css</A><SPAN>"</SPAN></SPAN><SPAN class="operator token">></SPAN>
<SPAN class="operator token"><</SPAN>script src<SPAN class="operator 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%2Fjs.arcgis.com%2F3.18%2F" target="_blank">https://js.arcgis.com/3.18/</A><SPAN>"</SPAN></SPAN><SPAN class="operator token">></SPAN><SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>script<SPAN class="operator token">></SPAN>

<SPAN class="operator token"><</SPAN>style<SPAN class="operator token">></SPAN>
html<SPAN class="punctuation token">,</SPAN> body<SPAN class="punctuation token">,</SPAN> #map <SPAN class="punctuation token">{</SPAN>
&nbsp; padding<SPAN class="punctuation token">:</SPAN> <SPAN class="number token">0</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp; margin<SPAN class="punctuation token">:</SPAN> <SPAN class="number token">0</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp; height<SPAN class="punctuation token">:</SPAN> <SPAN class="number token">100</SPAN><SPAN class="operator token">%</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp; width<SPAN class="punctuation token">:</SPAN> <SPAN class="number token">100</SPAN><SPAN class="operator token">%</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="punctuation token">}</SPAN>
<SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>style<SPAN class="operator token">></SPAN>

<SPAN class="operator token"><</SPAN>script<SPAN class="operator token">></SPAN>
<SPAN class="keyword token">var</SPAN> featCnt<SPAN class="punctuation token">;</SPAN>
<SPAN class="token function">require</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">[</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"esri/map"</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"esri/layers/FeatureLayer"</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"dojo/on"</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"esri/tasks/query"</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"dojo/parser"</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"dijit/form/Button"</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">"dojo/domReady!"</SPAN>
&nbsp; <SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp; <SPAN class="keyword token">function</SPAN><SPAN class="punctuation token">(</SPAN>
&nbsp;&nbsp;&nbsp; Map<SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp; FeatureLayer<SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp; on<SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp; Query<SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp; parser
&nbsp; <SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp; parser<SPAN class="punctuation token">.</SPAN><SPAN class="token function">parse</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">var</SPAN> map <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">Map</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"map"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; basemap<SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"hybrid"</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; center<SPAN class="punctuation token">:</SPAN> <SPAN class="punctuation token">[</SPAN><SPAN class="operator token">-</SPAN><SPAN class="number token">82.44109</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">35.6122</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; zoom<SPAN class="punctuation token">:</SPAN> <SPAN class="number token">17</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="comment token">// Carbon storage of trees in Warren Wilson College.</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">var</SPAN> featureLayer <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">FeatureLayer</SPAN><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%2FV6ZHFr6zdgNZuVG0%2Farcgis%2Frest%2Fservices%2FLandscape_Trees%2FFeatureServer%2F0" target="_blank">https://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/Landscape_Trees/FeatureServer/0</A><SPAN>"</SPAN></SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="string token">"outFields"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="punctuation token">[</SPAN><SPAN class="string token">"*"</SPAN><SPAN class="punctuation token">]</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; featureLayer<SPAN class="punctuation token">.</SPAN><SPAN class="token function">setDefinitionExpression</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"Tree_Age > 5"</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; map<SPAN class="punctuation token">.</SPAN><SPAN class="token function">addLayer</SPAN><SPAN class="punctuation token">(</SPAN>featureLayer<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="token function">getFeatureCnt</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="token function">on</SPAN><SPAN class="punctuation token">(</SPAN>dijit<SPAN class="punctuation token">.</SPAN><SPAN class="token function">byId</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"cntBtn"</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"click"</SPAN><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;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="token function">alert</SPAN><SPAN class="punctuation token">(</SPAN>featCnt<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">,</SPAN><SPAN class="keyword token">this</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">function</SPAN> <SPAN class="token function">getFeatureCnt</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&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;&nbsp;&nbsp;&nbsp;&nbsp; query<SPAN class="punctuation token">.</SPAN>where <SPAN class="operator token">=</SPAN> featureLayer<SPAN class="punctuation token">.</SPAN><SPAN class="token function">getDefinitionExpression</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; featureLayer<SPAN class="punctuation token">.</SPAN><SPAN class="token function">queryCount</SPAN><SPAN class="punctuation token">(</SPAN>query<SPAN class="punctuation token">,</SPAN> <SPAN class="keyword token">function</SPAN><SPAN class="punctuation token">(</SPAN>count<SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; featCnt <SPAN class="operator token">=</SPAN> count<SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</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="operator token"><</SPAN><SPAN class="operator token">/</SPAN>script<SPAN class="operator token">></SPAN>
<SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>head<SPAN class="operator token">></SPAN>

<SPAN class="operator token"><</SPAN>body <SPAN class="keyword token">class</SPAN><SPAN class="operator token">=</SPAN><SPAN class="string token">"claro"</SPAN><SPAN class="operator token">></SPAN>
&nbsp; <SPAN class="operator token"><</SPAN>div id<SPAN class="operator token">=</SPAN><SPAN class="string token">"map"</SPAN><SPAN class="operator token">></SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="operator token"><</SPAN>button data<SPAN class="operator token">-</SPAN>dojo<SPAN class="operator token">-</SPAN>type<SPAN class="operator token">=</SPAN><SPAN class="string token">"dijit/form/Button"</SPAN> type<SPAN class="operator token">=</SPAN><SPAN class="string token">"button"</SPAN> id<SPAN class="operator token">=</SPAN><SPAN class="string token">"cntBtn"</SPAN><SPAN class="operator token">></SPAN>Get Count<SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>button<SPAN class="operator token">></SPAN>
&nbsp; <SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>div<SPAN class="operator token">></SPAN>
<SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>body<SPAN class="operator token">></SPAN>

<SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>html<SPAN class="operator 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>‍</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><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>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

JohnAdams

Your examples aren't working. I think you have a problem with the feature layers (they don't seem to be loading at all).

My attempts to use a global variable are essentially the same you have above. I declare the variable in the same spot you do, and assign it in basically the same queryCount function you have, but whenever I try to access it *outside* the queryCount function, it returns as undefined.

RobertScheitlin__GISP

John,

I am not sure what going wrong on your end as all three of those samples work fine for me. Can you access the url that is in the samples just from you browser address bar?

JohnAdams

The first two are working now, but that's not what I want to do. Just the last one with the global variable still doesn't work - which unfortunately is what I want to do. The button loads but then it just hangs there. I need to have several variables which I need to access outside of the queryCount function, and even outside of the button handler. The variables would be created via the queryCount function, so basically I need that function to return a value. Every time I assign my global variables inside the queryCount function, the value disappears once you get outside the function (again, even though they're declared globally).

ImtiazSyed

Using ArcGIS API for Python

<SPAN class="keyword token">from</SPAN> arcgis<SPAN class="punctuation token">.</SPAN>gis <SPAN class="keyword token">import</SPAN> GIS

gis <SPAN class="operator token">=</SPAN> GIS<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"https://site.maps.arcgis.com"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"username"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"password"</SPAN><SPAN class="punctuation token">)</SPAN>

feature_layer_item <SPAN class="operator token">=</SPAN> gis<SPAN class="punctuation token">.</SPAN>content<SPAN class="punctuation token">.</SPAN>search<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"<item-id>"</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN>
flayers <SPAN class="operator token">=</SPAN> feature_layer_item<SPAN class="punctuation token">.</SPAN>layers

flayer <SPAN class="operator token">=</SPAN> flayers<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN>

count <SPAN class="operator token">=</SPAN> flayer<SPAN class="punctuation token">.</SPAN>query<SPAN class="punctuation token">(</SPAN>return_count_only<SPAN class="operator token">=</SPAN>true<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>

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