Passing values from Java script API to GP Service and reading it in custom GP Tool

CyrilCherian — Tue, 05 Feb 2013 03:12:17 GMT

Hi,
Not sure this is to be posted in JavaScript API or Geoprocessing.

I have an ESRI Javascript application that uses a geoprocessing service that uses a cutsom GP tool.
Since I have a set of values to be passed to the GP service I am planning to pass in it as a record set instead of string values. These are just attributes and no geometry associated with it. I think I can use FeatureSet in Javascript to pass GP input parameters.

Something like this. Let me know if this is the right way to pass record sets. I will have several records.
var attr = {"OBJETID:1", "Name":"Test", "Address:"Value2"};
var graphic = new esri.Graphic(null,null,attr,null);
var features= [];
features.push(graphic);
var featureSet = new esri.tasks.FeatureSet();
featureSet.features = features;

Now inside the custom GP function tool how do I set the paramaters to read the input? Following is what I am trying to do. Is this the correct approach?

IGPParameterEdit gpParameterEdit = new GPParameterClass();
            IGPDataType gpDataType = new GPRecordSetTypeClass();// GPStringTypeClass();
            IGPValue gpValue = new GPRecordSetClass();// GPStringClass(); ;
            gpParameterEdit.Name = "legal_desc";
            gpParameterEdit.DisplayName = "Legal Description";
            gpParameterEdit.DataType = gpDataType;
            gpParameterEdit.Value = gpValue;
            gpParameterEdit.Direction = esriGPParameterDirection.esriGPParameterDirectionInput;
            gpParameterEdit.ParameterType = esriGPParameterType.esriGPParameterTypeRequired;

Then while Casting the value, How do I cast and read the values from the input featureset? Following is what I am trying to do and it is returning null for gpRecordSet.
IGPValue gpValue = parameterValueArray.GetGPValue(_parameterIndex);
            IGPRecordSet gpRecordSet = (IGPRecordSet)gpValue;

Basically I am trying to see how to pass in set of attributes from JavaScript and read it in custom GP Tool.

Now the return value I expect in the JavaScript application is a polygon graphic and no attributes. What is the best way to return the polygon? What I understand from my research is that I need to create in-memory featurecalss and return the polygon as feature. Is there a better way.

All help appreciated.

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Passing values from Java script API to GP Service and reading it in custom GP Tool