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Bug in legend widget? Grouped legend values appear multiple times

StephenLead

In ArcMap, create a Unique Values symbology, select multiple categories, then right-click and Group them.

Publish to ArcGIS Server and add as a dynamic map service. Using the new JS API version 2.1 legend widget, create a legend from this layer.

I'm finding that the grouped categories display multiple times. Eg, if the group consists of 3 individual categories, the (identical) symbol will appear in the legend 3 times.

Please let me know if you need any further information to reproduce this bug.

Thanks,
Steve

PS I have no idea why this title has a smiley face. Maybe that's another bug.

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AlejandroMorales_

Still a problem in 2023. Issue is visible within Experience Builder using the Legend Widget. Similar to ParAman the Map Viewer legend shows up fine, but the legend in EP shows duplicates where symbology was grouped.

PärÅman

Still a problem. Legend has duplicate rows for grouped values using Map Viewer (Beta), but it's correct displayed in Map Viewer.

Using the Map Viewer (Beta) map in a webapp built on ArcGIS JS API (4.22).

Stuck with ArcGIS Enterprise 10.8.1 at the moment, later releases fixes this perhaps, but the bug was reported in a decade ago, not too hopeful.

kenbuja

If you're talking about NLiu's TOC widget, you'll find the documentation here. By setting the visible layers for all the layers to -1, all groups will be collapsed.

BrianMcLeer1

I have recently began using the TOC widget for a Java App, Does anyone know how to make it so all layers are off and all groups are collapsed by default? Thank you.

JeffPace1

Done 🙂 In May 😞

#NIM067830 When using symbology of unique values, getting a duplicate entry in the legend service of the REST endpoint

Just checked. This bug was submitted may 5th, 2011. Medium Severity. Not fixed.

JeffPace1

Richard, I think you're right. Perhaps we should be reporting this to the core ArcGIS Server or REST team, since it's nothing to do with the JS API.

I'm not on maintenance so I can't log a bug report - can someone else do it?

Cheers,
Steve

Done 🙂 In May 😞

#NIM067830 When using symbology of unique values, getting a duplicate entry in the legend service of the REST endpoint

StephenLead

it is not a bug with the legend widget, it has to do with how the rest service is defined from your layer symbology setup in ArcMap

Richard, I think you're right. Perhaps we should be reporting this to the core ArcGIS Server or REST team, since it's nothing to do with the JS API.

I'm not on maintenance so I can't log a bug report - can someone else do it?

Cheers,
Steve

JeffPace1

Any update on this? we have the same problem. If there are 4 values (even groups) in the mxd, there should only be 4 values in the legend.

Hi Guys,

I am coming across the same problem. In fact, it is not a bug with the legend widget, it has to do with how the rest service is defined from your layer symbology setup in ArcMap. I am building my own custom TOC and this had me stumped for a while. It happens in two instances that I am aware of:

- using "Unique values" in ArcMap, selecting a few categories and grouping them manually
- using "Unique values, many fields" in ArcMap (example in the attached esri_001.jpg)

When you check the rest service information, you will see some 17 entries under "Unique Value Infos: ". Which is essentially re-splitting your groups and undoing all your hard work! (abbreviated screenshot at esri_002.jpg)

So, you can workaround by creating a new column, and manually creating unique categories, but since our data is held in someone else's database, this is not an option for us.

Is there some other approach to this? And/or will ESRI be looking at why this happens in Rest and if it can be fixed?

Thanks,
Richard.

RichardKaufholz

Hi Guys,

I am coming across the same problem. In fact, it is not a bug with the legend widget, it has to do with how the rest service is defined from your layer symbology setup in ArcMap. I am building my own custom TOC and this had me stumped for a while. It happens in two instances that I am aware of:

- using "Unique values" in ArcMap, selecting a few categories and grouping them manually
- using "Unique values, many fields" in ArcMap (example in the attached esri_001.jpg)

When you check the rest service information, you will see some 17 entries under "Unique Value Infos: ". Which is essentially re-splitting your groups and undoing all your hard work! (abbreviated screenshot at esri_002.jpg)

So, you can workaround by creating a new column, and manually creating unique categories, but since our data is held in someone else's database, this is not an option for us.

Is there some other approach to this? And/or will ESRI be looking at why this happens in Rest and if it can be fixed?

Thanks,
Richard.

esri_001.jpg

esri_002.jpg

StephenLead

Hi Kelly,

Try making a legend from the feature service at:

http://203.14.35.213/ArcGis1/rest/services/atlas/NaturalEnvironment_NationalParks/MapServer/0

I'm finding that the Other category appears 4 times, as there are 4 classes which I've combined into a single class.

Thanks,
Steve

StephenLead

Thanks Kelly.

As a workaround, I created a new field and calculated the value that I wanted to appear in the legend, and used this to set the symbology.

khutchins

I tested with both msd and mxd and can't reproduce but I'll keep researching this.

I'm getting this same problem Steve - did you manage to find a solution? I'm using MXD's so I don't think it's anything to do with that.

StephenLead

Hi Kelly,

Just a thought - I'm using an MSD file as input for the service. I've noticed that there's sometimes a difference when an MSD vs MXD file is used, which might be the case here?

Steve

khutchins

Sounds good Steve, I'll try a few different tests as well to see if I can reproduce here as well.

Hi Kelly,

Your legend works fine for me, so I'm not sure what the problem is. Once our web server is outwardly facing I'll get you to try it and see if we can reproduce the problem.

Cheers,
Steve

StephenLead

Hi Kelly,

Your legend works fine for me, so I'm not sure what the problem is. Once our web server is outwardly facing I'll get you to try it and see if we can reproduce the problem.

Cheers,
Steve

khutchins

Steve and Jeff,

I updated a service to try and reproduce the problem but my legend doesn't display multiple items. The test service is public:

https://servicesbeta.esri.com/ArcGIS/rest/services/SanJuan/Trails/MapServer

The Trail Conditions layer has a unique value renderer and I grouped two of the items (maintenance and bridge). I also created a group layer (Trails, Regional Trail Conditions) just in case that was the issue.

I then modified the Legend Widget sample from the help to use the San Juan layer and in my tests there are no duplicate items. Is there something in your service that is substantially different?

JeffLegato

Do you have a test service that shows the problem?

Kelly, We are experiencing this same issue and we don't have a outward facing server yet to show you.

We used the same steps as Steve, symbolize a layer and group in Symbology tab in Layer Properties.

Just thought you should know.

StephenLead

Hi Kelly,

Unfortunately my server isn't yet accessible externally. But hopefully the description above is enough for you to recreate a similar service? Basically just use a Unique Values renderer, select a couple of classes, and choose Group.

Thanks,
Steve

khutchins

Do you have a test service that shows the problem?

Any response from ESRI?

What's the best way to submit this as a bug report, given that I'm an EDN customer so don't have access to the full tech support?

Thanks,
Steve

StephenLead

Any response from ESRI?

What's the best way to submit this as a bug report, given that I'm an EDN customer so don't have access to the full tech support?

Thanks,
Steve

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