topic Re: Send ID to Geometry Service to link callback? in ArcGIS JavaScript Maps SDK Questions

Send ID to Geometry Service to link callback?

JerryGarcia — Sun, 09 Nov 2014 03:07:55 GMT

Is it possible to send an ID to the Geometry Service so I know which callback links to the original request?

Re: Send ID to Geometry Service to link callback?

RobertScheitlin__GISP — Mon, 10 Nov 2014 03:37:47 GMT

Jerry,

You can do an inline function on the results of the geometryService or use the "then" word like in this Sample

Re: Send ID to Geometry Service to link callback?

JerryGarcia — Mon, 10 Nov 2014 15:20:26 GMT

Thanks for your reply.

Can you provide an example of an inline function that does this?

Re: Send ID to Geometry Service to link callback?

RobertScheitlin__GISP — Mon, 10 Nov 2014 15:47:17 GMT

Jerry,

An inline function would simply be:

      GeometryService.simplify([geoms],lang.hitch(this,function(sgeoms){
        //do something with the sgeoms
        //because you used lang.hitch you have access to the scope of the
        //function that called this async result, which means
        //you have access to variables of the function that called this
      }),lang.hitch(this,function(err){
        //do something
      }));

Re: Send ID to Geometry Service to link callback?

AaronHeyman — Mon, 10 Nov 2014 15:56:11 GMT

Yes you can send more information to the callback using the dojo command lang.partial.

This is a typical query task, which returns a result set:

var someVar = "Test";

listQueryDeferreds = listTask.execute(listQuery, function(results) {

// the code to process the results, someVar will be "Not Test" when this callback executes;

});

someVar = "Not Test";

Now with lang,partial

var someVar = "Test";

listQueryDeferreds = listTask.execute(listQuery, lang.partial( function(someVar, results) {

// the code to process the results. someVar will be "Test";

}, someVar ));

someVar = "Not Test";