topic Re: How do I get individual values back from FeatureLayers on a click event? in ArcGIS JavaScript Maps SDK Questions

How do I get individual values back from FeatureLayers on a click event?

ChrisSergent — Tue, 28 Apr 2015 17:31:34 GMT

I want to be able to get individual values to populate this application: http://maps.decaturil.gov Currently when I click on a point on the map, its displays this:

How would I get just the value of the field OBJECTID for example?

Re: How do I get individual values back from FeatureLayers on a click event?

TimWitt2 — Tue, 28 Apr 2015 17:34:21 GMT

When you create the layer you can specify it in the outfield property

   layer = new FeatureLayer("//sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer/2", {
            "id": "Washington",
            "infoTemplate": popupTemplate,
            "mode": FeatureLayer.MODE_SNAPSHOT,
            "outFields": [OBJECTID],
            "opacity": 0.8
         });

Re: How do I get individual values back from FeatureLayers on a click event?

TimWitt2 — Tue, 28 Apr 2015 17:36:23 GMT

Or you can create a infotemplate for each layer if you want to make your popups look different.

Custom info window | ArcGIS API for JavaScript

Re: How do I get individual values back from FeatureLayers on a click event?

ChrisSmith7 — Tue, 28 Apr 2015 18:52:32 GMT

Here's an example of using a custom template:

var serviceUrl = "https://myserviceurl.com/arcgis/rest/services/etc ...";

var outFields = ["OBJECTID", "FIELD1", "FIELD2", "FIELD3"];

var content = "<tr>" + $("#ff_formVal").val() + ": <td>{FIELD3}</td></tr>"

var infoTemplate = new esri.InfoTemplate("{FIELD3}", content);

var fl = new FeatureLayer(serviceUrl, {

id: "featLayer",

mode: FeatureLayer.MODE_ONDEMAND,

outFields: outFields,

infoTemplate: infoTemplate,

wkid: 102100

});

I made some code mods after pasting, so hopefully I didn't foobar something (updates not tested)!

Re: How do I get individual values back from FeatureLayers on a click event?

ChrisSergent — Tue, 28 Apr 2015 19:37:54 GMT

This is close but I don't want a template, I know how to do that. What I want is to get the individual values so I can take the values and write them to the form below. If I had a line of code as an example, I could write the code for the other values. Any ideas? :

Re: How do I get individual values back from FeatureLayers on a click event?

TimWitt2 — Fri, 10 Dec 2021 22:00:56 GMT

You can use the onclick event of your feature layer to get any attribute you want:

yourlayer.on("click", function (evt){
  theAttributeYouWant = evt.graphic.attributes.OBJECTID;
});

Tim

Re: How do I get individual values back from FeatureLayers on a click event?

ChrisSergent — Tue, 28 Apr 2015 19:54:27 GMT

I think I am doing it wrong. I wrote this:

app.citizenRequestLayer.on("click", function (evt) {

myObject = evt.graphic.attributes.OBJECTID;

});

and I get: Uncaught ReferenceError: myObject is not defined

Re: How do I get individual values back from FeatureLayers on a click event?

TimWitt2 — Tue, 28 Apr 2015 20:02:22 GMT

What happens if you leave app. off. just have it as citizenRequestLayer.on?

Re: How do I get individual values back from FeatureLayers on a click event?

ChrisSergent — Tue, 28 Apr 2015 20:04:56 GMT

That won't work. app is an object for the purpose of unobtrusive JavaScript, so it's needed.

Re: How do I get individual values back from FeatureLayers on a click event?

KenBuja — Tue, 28 Apr 2015 20:08:39 GMT

Where are you defining the variable "myObject" and where do you get the error? Is it in the click callback or somewhere else?

Re: How do I get individual values back from FeatureLayers on a click event?

TimWitt2 — Tue, 28 Apr 2015 20:09:48 GMT

You need to make sure that myObject is globally defined.

Re: How do I get individual values back from FeatureLayers on a click event?

ChrisSergent — Tue, 28 Apr 2015 20:27:30 GMT

It is.

Re: How do I get individual values back from FeatureLayers on a click event?

ChrisSergent — Tue, 28 Apr 2015 20:32:40 GMT

I just have the click event. Here is the full code: https://github.com/csergent45/streetSigns/blob/master/app/main.js

and here is an excerpt:

app.citizenRequestLayer = new FeatureLayer(config.citizenRequestLayerUrl, {

mode: FeatureLayer.MODE_ONEDEMAND,

//infoTemplate: new InfoTemplate(config.infoTemplate),

outFields: ["*"]

});

app.map.addLayer(app.citizenRequestLayer);

app.citizenRequestLayer.on("click", function (evt) {

myObject = evt.graphic.attributes.OBJECTID;

});

Re: How do I get individual values back from FeatureLayers on a click event?

NicholasHaney — Tue, 28 Apr 2015 20:57:53 GMT

Chris, I took a look at your code on GitHub. You declare the variable myobject on line 89 but then try to use the variable myObject on line 137. Variables are case sensitive in Javascript. Change the variable on line 137 to myobject and it should work.

Re: How do I get individual values back from FeatureLayers on a click event?

KenBuja — Tue, 28 Apr 2015 20:59:16 GMT

You defined "myobject" (line 89) but attempt to use "myObject"

Re: How do I get individual values back from FeatureLayers on a click event?

ChrisSergent — Tue, 28 Apr 2015 21:05:04 GMT

Yea Nicholas Haney and Ken Buja, I feel like an idiot. I know that JavaScript is case sensitive. Should've checked my case when I received those errors. Thanks for getting me back on track. And this is my easy question.