Spatial Reference undefined error when trying to buffer polygon

[sholyoak]

I'm trying to buffer a polygon in my map, and I keep getting an "_a94[0].spatialReference is undefined" error from the 2.8 api js file. I've verified that the spatialRef var is an actual spatial reference object. I've verified that I have a valid geometry in that same spatial reference. I've verified that my geometry service actually will return a polygon when buffering (though I've admittedly only tested a point that way). My geoms var in my callback function always returns undefined. I don't understand what's going on. My code is below:

I call initializeBuffer on load. Then bufferSelectedFeatures is called when the toolbar button is clicked.

Please help!

function initializeBuffer() {
	bufferSymbol = new esri.symbol.SimpleFillSymbol(esri.symbol.SimpleFillSymbol.STYLE_SOLID, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_DASHDOT, new dojo.Color("#234483")), new dojo.Color([0,255,0],0.25));
	geomSvc = esri.config.defaults.geometryService;
	
	bufferParams = new esri.tasks.BufferParameters();
	bufferParams.unionResults = true;
	bufferParams.unit = esri.tasks.GeometryService.UNIT_FOOT;
}

function bufferSelectedFeatures() {
	bufferParams.bufferSpatialReference = spatialRef;
	bufferParams.outSpatialReference = spatialRef;
	bufferParams.geometries = selectedFeatures;
	var distances = [];
	//TODO:change this to get the distance from the user
	distances[0] = 200;
	bufferParams.distances = distances;
	geomSvc.buffer(bufferParams, bufferComplete);
}

function bufferComplete(geoms) {
	//convert geometries to graphics
	dojo.forEach(geoms, function(geom){
		var graphic = new esri.Graphic(geom, bufferSymbol);
		map.graphics.add(graphic);
	});
}

[swingley]

What do you see in firebug or chrome dev tools if you put this in your bufferSelectedFeatures function:

console.log("selected features: ", selectedFeatures);

selectedFeatures needs to be an array. Also confirm that each selected feature has a spatial reference and please post the JSON for that represents your spatial reference.

[sholyoak]

I get [object Object] in the console. I've verified my selected feature has the exact same wkid spatial reference as the bufferParams, 2276. I'm not sure what you mean by posting the JSON for my spatial reference. I'm setting it on load

spatialRef = new esri.SpatialReference({wkid:2276});

[swingley]

Sounds like you're using IE...Chrome and Firefox + Firebug give you more detailed info.

For the spatialReference JSON, you can do something like this in the console:

dojo.toJson(spatialRef)

But it sounds like your spatial reference is correct.

Is selectedFeatures an array? bufferParameters.geometries has to be an array.

[sholyoak]

Actually, I'm using Firefox and Firebug. The JSON is

{"wkid":2276,"wkt":null,"_info":{"3857":{"wkTemplate":"PROJCS[\"WGS_1984_Web_Mercator_Auxiliary_Sphere\",GEOGCS[\"GCS_WGS_1984\",DATUM[\"D_WGS_1984\",SPHEROID[\"WGS_1984\",6378137.0,298.257223563]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Mercator_Auxiliary_Sphere\"],PARAMETER[\"False_Easting\",0.0],PARAMETER[\"False_Northing\",0.0],PARAMETER[\"Central_Meridian\",${Central_Meridian}],PARAMETER[\"Standard_Parallel_1\",0.0],PARAMETER[\"Auxiliary_Sphere_Type\",0.0],UNIT[\"Meter\",1.0]]","valid":[-20037508.342788905,20037508.342788905],"origin":[-20037508.342787,20037508.342787],"dx":0.00001},"4326":{"wkTemplate":"GEOGCS[\"GCS_WGS_1984\",DATUM[\"D_WGS_1984\",SPHEROID[\"WGS_1984\",6378137.0,298.257223563]],PRIMEM[\"Greenwich\",${Central_Meridian}],UNIT[\"Degree\",0.0174532925199433]]","altTemplate":"PROJCS[\"WGS_1984_Plate_Carree\",GEOGCS[\"GCS_WGS_1984\",DATUM[\"D_WGS_1984\",SPHEROID[\"WGS_1984\",6378137.0,298.257223563]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Plate_Carree\"],PARAMETER[\"False_Easting\",0.0],PARAMETER[\"False_Northing\",0.0],PARAMETER[\"Central_Meridian\",${Central_Meridian}],UNIT[\"Degrees\",111319.491]]","valid":[-180,180],"origin":[-180,180],"dx":0.00001},"102100":{"wkTemplate":"PROJCS[\"WGS_1984_Web_Mercator_Auxiliary_Sphere\",GEOGCS[\"GCS_WGS_1984\",DATUM[\"D_WGS_1984\",SPHEROID[\"WGS_1984\",6378137.0,298.257223563]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Mercator_Auxiliary_Sphere\"],PARAMETER[\"False_Easting\",0.0],PARAMETER[\"False_Northing\",0.0],PARAMETER[\"Central_Meridian\",${Central_Meridian}],PARAMETER[\"Standard_Parallel_1\",0.0],PARAMETER[\"Auxiliary_Sphere_Type\",0.0],UNIT[\"Meter\",1.0]]","valid":[-20037508.342788905,20037508.342788905],"origin":[-20037508.342787,20037508.342787],"dx":0.00001},"102113":{"wkTemplate":"PROJCS[\"WGS_1984_Web_Mercator\",GEOGCS[\"GCS_WGS_1984_Major_Auxiliary_Sphere\",DATUM[\"D_WGS_1984_Major_Auxiliary_Sphere\",SPHEROID[\"WGS_1984_Major_Auxiliary_Sphere\",6378137.0,0.0]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Mercator\"],PARAMETER[\"False_Easting\",0.0],PARAMETER[\"False_Northing\",0.0],PARAMETER[\"Central_Meridian\",${Central_Meridian}],PARAMETER[\"Standard_Parallel_1\",0.0],UNIT[\"Meter\",1.0]]","valid":[-20037508.342788905,20037508.342788905],"origin":[-20037508.342787,20037508.342787],"dx":0.00001}},"declaredClass":"esri.SpatialReference"}

selectedFeatures is an array. I checked in Chrome and I get a bit more information on the error. It says

Uncaught TypeError: Cannot read property 'wkid' of undefined
dojo.declare.toJson                     serverapi.arcgisonline.com:48
dojo.declare.buffer                      serverapi.arcgisonline.com:48
bufferSelectedFeatures                buffer.js:30
bufferFeatures                           layout.js:403
onClick
dojo.declare._onClick                   serverapi.arcgisonline.com:48
dojo.declare._onButtonClick          serverapi.arcgisonline.com:48
dojo.hitch

[swingley]

Thanks. What does this show:

console.log("first feature's wkid: ", selectedFeatures[0].spatialReference.wkid);

[sholyoak]

Undefined, if I use

console.log("First feature's spatial reference: " + selectedFeatures[0].spatialReference.wkid);

If I use

console.log("First feature's spatial reference: " + selectedFeatures[0].geometry.spatialReference.wkid);

I get 2276.

[swingley]

OK, cool, we're getting somewhere . It looks like selectedFeature is an array of graphics, not geometries. Try this:

var geoms = dojo.map(selectedFeatures, function(graphic) {
  return graphic.geometry;
});
bufferParams.geometries = geoms;

[sholyoak]

Indeed, that was it. I'm going to research why that is, but at least I now have a buffer around my selected feature. Thanks for your help!

[swingley]

Glad to help! Thanks for marking this thread answered as well.