topic feature.attributes syntax in ArcGIS JavaScript Maps SDK Questions

feature.attributes syntax

KeithAnderson — Fri, 30 Jan 2015 20:06:20 GMT

Friends

I have some feature results coming back from a queryTask to populate a grid.

This return gives me the correct data

var data = arrayUtils.map(results.features, function (feature) {

return { "id": feature.attributes["OBJECTID"],

"NAME": feature.attributes["PARCELID"]

{

});

but I would like just the first two fields without explicitly naming them.

Something like this?

return { "id": feature.attributes[outFields[0]],

"NAME": feature.attributes[outFields[1]]

}

Just can't get it.

Any syntax suggestions?

Keith

Re: feature.attributes syntax

ReneRubalcava — Sat, 11 Dec 2021 07:49:20 GMT

A QueryTask returns a couple of pieces of info you could use. It returns a fieldAliases array and a fields array.

The fields array isn't listed in the docs, but it's on the REST spec.

Anyway, you could do something like

return { 
  "id": feature.attributes[featureSet.fields[0].name],   
   "NAME": feature.attributes[featureSet.fields[1].name]
};

It's a little odd, but that could work.

Re: feature.attributes syntax

KeithAnderson — Fri, 30 Jan 2015 20:41:00 GMT

Thanks for the quick response Rene….but that didn’t work.

I did, however, buy your book.

I love it.

I read it every day along with the dojo Toolkit documentation.

Pretty sad life;)

Keith

Re: feature.attributes syntax

ReneRubalcava — Sat, 11 Dec 2021 07:49:23 GMT

Thanks!

Odd it didn't work, but you could hack together that outFields array and try it the way you have in your example.

Something like:

var outFields = Object.keys(feature.attributes);
//var outFields = Object.keys(features[0].attributes); //> I would do this when you first get results
return {
  "id": feature.attributes[outFields[0]],                 
  "NAME": feature.attributes[outFields[1]]
};

If you are using an older version of IE, you could use dojox/lang/functional/object to get the keys.

It's a little odd to do it that way but I think that would definitely work. maybe

Re: feature.attributes syntax

MahtabAlam1 — Fri, 30 Jan 2015 21:04:13 GMT

It's probably not working as you won't be able to read the featureSet object which is assigned outside the scope of arrayUtil.map function. So you need to pass "this" context using lang.hitch.So add module "dojo/_base/lang" as lang and try following:

featureSet = results;

var data = arrayUtils.map(results.features, lang.hitch(this,function (feature) {

return {

"id": feature.attributes[featureSet.fields[0].name],

"NAME": feature.attributes[featureSet.fields[1].name]

{

}));

Re: feature.attributes syntax

KeithAnderson — Fri, 30 Jan 2015 21:04:25 GMT

U r a superstar!

It worked.

Thanks you so much.

Keith

Re: feature.attributes syntax

KeithAnderson — Fri, 30 Jan 2015 21:11:44 GMT

Thank you Mahtab!