topic Attribute Expressions in AGOL in Python Questions

Attribute Expressions in AGOL

VishalShah2 — Mon, 18 Sep 2017 19:43:24 GMT

I'm currently looking at/researching how to edit attribute expressions and even change the color of text in the expressions. My problem is, I do not know how to go about it or which language to use that would be best.

Any links to articles/discussion/resources or even solutions are welcome!

Re: Attribute Expressions in AGOL

XanderBakker — Mon, 18 Sep 2017 19:47:16 GMT

The scripting language is called Arcade (ArcGIS Arcade | ArcGIS for Developers ) which is similar to JavaScript (not Python). Use a script to create new results based on multiple attributes. When using Arcade in the pop-up windows, you can get some fancy results. See also this thread: https://community.esri.com/thread/197406-insert-html-with-arcade

Re: Attribute Expressions in AGOL

VishalShah2 — Mon, 18 Sep 2017 19:53:47 GMT

Do you know of any examples where people have tried to change the color of the expressions?

Re: Attribute Expressions in AGOL

Greg_Mattis — Mon, 18 Sep 2017 23:21:27 GMT

Hi Vishal,

Here is the documentation that I think you are looking for. It is at the very bottom talking about using If Then statements to drive font color and it gives you the arcade statement.

Specify text for labels—ArcGIS Pro | ArcGIS Desktop

Re: Attribute Expressions in AGOL

XanderBakker — Sat, 11 Dec 2021 20:43:07 GMT

To show an example of what can be done, your html code for a pop-up could be like this:

<font color="{expression/expr0}"><b>{GRAVEDAD}</b></font>‍

In this case my field is called "GRAVEDAD" with three possible values: SOLO DAÑOS (only material damage), HERIDOS (injuries), MUERTO (diseased). If you would like to vary the color of the text, you can use an Arcade expression inside the color tag (switch to HTML view to reveal the html code).

The expression in my case would be:

// #800080 purple
// #ff0000 red
// #ff8c00 orange
var dct_grav = {"SOLO DAÑOS": "#ff8c00",  "HERIDO": "#ff0000", "MUERTO": "#800080"};

var gravedad = $feature.GRAVEDAD;
var color = dct_grav[gravedad];
Console(color);
return color‍‍‍‍‍‍‍‍‍

This will return the color code (purple, red or orange) depending the field value GRAVEDAD, resulting in:

Re: Attribute Expressions in AGOL

VishalShah2 — Tue, 19 Sep 2017 12:41:45 GMT

Thank you Greg! This is my first time working with Arcade and Attribute Expressions in AGOL!

Re: Attribute Expressions in AGOL

VishalShah2 — Tue, 19 Sep 2017 12:42:09 GMT

Thank you Xander! This is my first time working with Arcade and Attribute Expressions in AGOL!

Re: Attribute Expressions in AGOL

VishalShah2 — Sat, 11 Dec 2021 20:43:10 GMT

// #FAAF41 Primary Color

var primaryColor = "#FAAF41";

var networkID = $feature.NetworkID;
var color = primaryColor[networkID];
Console(color);
return color

<font color="{expression/expr0}"><b>{networkID}</b></font>‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Xander,

In line 10, I get an Unexpected identifier error. Do you know why that is?

Re: Attribute Expressions in AGOL

XanderBakker — Tue, 19 Sep 2017 16:26:52 GMT

Yes, line 10 should not be part of the Arcade expression. It is the html code that should be used in the pop-up configuration.

In the pop-up configuration, select "A custom attribute display" and hit CONFIGURE:

Then switch to HTML with the "View HTML source" button:

and past the HTML here

Re: Attribute Expressions in AGOL

VishalShah2 — Sat, 11 Dec 2021 20:43:13 GMT

Yea removing line 10 took out the error for unexpected identifier, however with this code now for Attribute Expressions, i get the execution error: runtime error: cannot call member property on object of this type. I'm fairly new to Arcade and such and do not understand these errors. Any assistance on this bit then?

// #FAAF41 Primary Color

var primaryColor = "#FAAF41";

var networkID = $feature.NetworkID;
var color = primaryColor[networkID];
Console(color);
return color‍‍‍‍‍‍‍‍

Re: Attribute Expressions in AGOL

XanderBakker — Tue, 19 Sep 2017 19:58:38 GMT

How many colors do you have? In my example y have 3 values, hence the line:

var dct_grav = {"SOLO DAÑOS": "#ff8c00",  "HERIDO": "#ff0000", "MUERTO": "#800080"};‍

When the value is "HERIDO", the text "#ff0000" is returned.

In your case you don't have a dictionary or object, but a single string:

var primaryColor = "#FAAF41";‍

In your case your code should be:

var primaryColor = {"your networkID value": "#FAAF41", "some other networkID value": "#AAAAAA"};‍

When you have a single value you would not need to use Arcade and could just hard code the color in the html code, but I am sure that that is not the case for you.

Can you provide a list of values in the field networkID and the corresponding colors?

Re: Attribute Expressions in AGOL

VishalShah2 — Tue, 19 Sep 2017 20:18:35 GMT

So there are roughly 600 values in the NetworkID field, which is proprietary information to my company, and the color code I provided was the primary color my company uses and is associated with us. I am trying to change the text of the NetworkIDs to be the color of that color code ( #FAAF41). Right now, there is no vision as to where we are going with the attribute expressions capability of AGOL but my company wants me to get familiar with it and test it out on existing data we have to see what I can do with it and if I can get it working while the higher ups decide what they want customized. Hopefully that explanation helps a bit.

Re: Attribute Expressions in AGOL

XanderBakker — Tue, 19 Sep 2017 23:18:18 GMT

If you have a single color, then there is no need to use Arcade to define the color of the text, since it will always be the same. If you insist on using Arcade, it would be enough to have the color hard coded in the html code

Re: Attribute Expressions in AGOL

XanderBakker — Wed, 20 Sep 2017 18:30:19 GMT

Hi vshah6 , in additional to what I said before, it is really a very good thing to start exploring the possibilities of Arcade. Although it is already quite powerful, Arcade will start to play a much larger role in the ArcGIS Platform. There are some big things coming as part of the ArcGIS Utility Network Management extension for Enterprise, like attribute rules.