QueryTask for dynamicLayer

[tomwang1]

Hi,

I am using ArcGISDynamicMapServiceLayer not FeatureLayer. I am wondering if there a way to query a dynamic layer while user clicks on map? Something likes:

var queryTask =  new QueryTask(dynamicMapServiceUrl + "/dynamicLayer", {
                "source": layerSource
              });
var query = new Query();
query.geometry = clickedMapPoint

[JianHuang · Accepted solution]

Yes, the code snippet that you have should work.

[tomwang1]

Hi Huang Jian,

Nice to talk you again. I am not sure what I have be missing. I got this error message:

Uncaught TypeError: Object [object Object] has no method 'toJson'


If I change "dynamicMapServiceUrl/dynamicLayer" to "dynamicMapServiceUrl/2" to test my code, it works fine. Also the layerSource has no problem to draw on my map. Please advise!

function createQueryDataSourceLayer(mQuery) {
                  var m_queryDataSource = new esri.layers.QueryDataSource();
                  m_queryDataSource.geometryType = "polygon";
                  m_queryDataSource.oidFields = ["OBJECTID"];
                  m_queryDataSource.query = mQuery;
                  m_queryDataSource.spatialReference = new esri.SpatialReference({ wkid: 102100 });
                  m_queryDataSource.workspaceId = "myworkspace";
                  layerSource = new LayerDataSource();
                  layerSource.dataSource = m_queryDataSource;

                  return layerSource;
              }

[JianHuang]

What is the layerSource got returned? Please post the json object.

[tomwang1]

I am not sure how to post json of the layerSource? it is an object. I can see from Chrome console, there are too many object in side.

[JianHuang]

Or, maybe you can create a simple reproducible case and put it on jsfiddle.net.

[tomwang1]

Thanks Huang Jian,

It was my mistake.  QueryTask for dynamicLayer works fine with no problem!