inconsistent Behavior this morning with the Deferred object

MarkAndrews — Thu, 05 Feb 2015 15:19:02 GMT

A while back I wrote a function with a deferred object that has been working successfully for several months.

This morning, it fails and I am not sure why.

I am using the 3.11 ESRI Javascript Library:

Here is the function call with the deferred object (it is in a helper class, so it can be called over mulitple pages):

addTract: function () {

var d = new Deferred();

var layer = new FeatureLayer(tractFeatureurl, { mode: FeatureLayer.MODE_ONDEMAND, outFields: ["*"] });

layer.setDefinitionExpression("tract_id = " + this.tractid);

this.mapObj.map.addLayer(layer);

this.tracts = layer;

var q = new Query();

q.returnGeometry = true;

q.outFields = ["*"];

var cb = layer.queryFeatures(q);

cb.then(lang.hitch(this, function (results) {

this.tractFeature = results.features[0];

console.debug(this.tractFeature);

this.mapObj.zoomToFeatures(results.features);

d.resolve(this.tractFeature);

return d.promise;

}));

}

It is being class on a page like this:

var res = utils.addTract();

console.debug(res);

if (res == undefined) {

alert("undefined");

return;

}

res.then(function (tract) {

// do more processing....

});

Up until this morning, it was working fine, but now the response back from the addTract function is undefined.

Re: inconsistent Behavior this morning with the Deferred object

JohnGrayson — Thu, 05 Feb 2015 15:36:48 GMT

The following line should be outside if the async 'then' function.

return d.promise;

John