Latest Contributions by JoeNunn

The Search Layers function has been a recent addition to MapViewer (maybe early 2026?). It is useful for quickly finding a layer, however we believe it also has very negative performance issues, if a large number of layers are used on a webmap. We believe this has impacted the performance of 100s of projects we have setup. The search layer function was made available in the 'Map Layers Widget' in Experience Builder prior to this, and had a similar affect on performance, however in experience builder we were able to turn this off with a toggle (see below). This then immediately improved performance when this feature was turned off in Experience builder or when viewing the App. I suspect that when this feature is include it is constantly scanning the list of layers. If the list is large then it will have performance issues. The possibilities here would be to either create a toggle that turns this feature off, and stops performing this scans of the layer list, OR a lighter search list that does not need to scan the layer list, until search is clicked. Prior to this feature being added we were able to create maps with large numbers of layers added with not to much issue. Since the change these cause major slowness when the layer list is opened in MapViewer. If the layer list is closed then it speeds up again. Likewise performance of the webmap is fine when viewed through our Experience Builder App. The problem here is that the Layer List in MapViewer is needed as it is a critical feature when a GIS Consltant is building or updating a webmap. I understand that the aim is to reduce the number of layers in MapViewer however working for an AEC company at the planning stage of a large development it is inevitable that there are many layers required to compare on the same map. At the same time I don't think we are unique in this respect, many other large AEC companies working in the planning industry experiencing similar issues, so I think this is a critical add on.

Hi, I believe the 'Search Layers' input form is causing performance issues with MapViewer. This allows you to filter the list of layers which is handy but might also be problematic. Prior to this appearing there was a similar feature available on the Map Layers widget on Experience builder. This resulted in extremely slow performance when a lot of layers were present. Maybe due to it scanning the list continuously? In experience builder once we had identified the issue we could just turn it off and good performance resumed. Now this is added to MapViewer we are seeing worse performance again in the MapViewer, but quicker performance on the Experience Builder app. This suggest that may be the problem? Could this be either improved to avoid Performance issues, or a setting to turn it off? Search Layers input form

‎03-23-2026

This would also be extremely useful for us for a number of applications. Some exampels below: Routeing Overhead Lines with a 200m width would be one. This allows the person while drawing the lines to immediatly avoid overlapping constraints within the 200m corridor. Automatically displaying a wind turbine topple distance buffer without having to create buffers Creating a 100m wide corridor while drawing a bat survey track walk Assigning buffers on vantage points for ornithologists with 2km buffers to mark out how far they might be able to see.

‎12-03-2025

Sadly not EXB - we are testing Sweet for ArcGIS due to its ability to use topology rules, which are not possible in Expereince Builder : https://www.esriuk.com/en-gb/arcgis/products/sweet-for-arcgis/overview It does mean it limits some of the capabilities of Map viewer though, for example i havent found a means to view attribute tables in it.

‎12-02-2025

Hi, I am new to using Sweet for ArcGIS Builder to develop an app to check on many existing features, and am looking for a way to create a shortcut which can zoom to the next feature from a layer (that has not been reviewed yet). The purpose is to make it as fast as possible to navigate to the next item that has not been checked. I have a field with an 'unchecked' attribute so would ideally skip to next feature with that on it. I would also like to be able to filter the list of features based on an attribute eg Local Authority. If one of the existing templates has this already setup i can copy how it has been done. Open to alternative ideas if this is not viable (i am aware there is no view of a table in Sweet). Any help would be appreciated! Thanks Joe

‎10-24-2025

I have just been testing using ArcGIS 3.5.4 to ugrade within our team and immediatly stumbled into this issue getting the Arcade error: Spatial reference expected. on an arcade field calculation. I managed to get it to work on 3.4 but not in 3.5.4 giving the same error. The line of code it failed on was this: intersectArea += Area(intersection($feature,block), "square metres"); Would be good to know if this is fixed so we can trust an upgrade?

‎10-03-2025

Hi, I am aware it is now possible to use freehand polyline drawing on Map Viewer : https://www.esri.com/arcgis-blog/products/arcgis-online/data-management/5-tips-editing-map-viewer-2025 It would be really useful if this feature was made available in FieldMaps. Ornithology team require this feature with a stylus to quickly sketch flight lines of bird on a map. Currently the ability to add verticies is not adequate for their needs. Thanks Joe

‎09-05-2025

Thanks Glen - maybe its the item itself causing the issue? I will try it on a simpler version maybe. Anyway this proves the workflow works. Best regards Joe

‎09-04-2025

Hi @Clubdebambos , Its a feature layer collection with multiple layers (7 or 8 i think). Its we use it as a template: Would there be a better way to generate a new hosted feature collection from a template (say from a schema?) than attempting to duplicate an existing feature collection?

‎09-03-2025

Hi, I am attempting to use the copy_feature_layer_collection in a Notebook on ArcGIS Online (Python 3). Previously this worked fine (possibly when AGOL was using an older version of the python?). Now it fails. newHab = habItem.copy_feature_layer_collection(service_name = habName, layers = layer_ids_h, tables = table_ids_h, folder = folderName) The error given looks like this: --------------------------------------------------------------------------- AttributeError Traceback (most recent call last) /tmp/ipykernel_19/1373826970.py in <cell line: 0>() ---> 19 newHab = habItem.copy_feature_layer_collection(service_name = habName, layers = layer_ids_h, tables = table_ids_h, folder = folderName) /opt/conda/lib/python3.11/site-packages/arcgis/gis/__init__.py in copy_feature_layer_collection(self, service_name, layers, tables, folder, description, snippet, owner) > 13848 fs = FeatureLayerCollection(url=copied_item.url, gis=self._gis) 13849 fs_manager = fs.manager 13850 add_defs = {"layers": [], "tables": []} AttributeError: 'NoneType' object has no attribute 'url' I have tested the item and all the input parameters - all seem valid. ANy ideas why this might have happended? We used this to replace the clone_items() that also changed behavior after python updates. thanks! Joe

‎07-02-2024

Hi @ValGaj - I finally (a year or more later!) got an opportunity to use your approach as python 1.8.4 is no longer available on AGOL notebook (as far as i am aware). It does work so thank you for providing this solution. To get it to work i have to clone all the layers first by cloning the initial map, then run the clone a second time on the webmap with the item_mapping setup correctly now i have the new IDs, then delete the first cloned map. This is considerably more code to achieve the same effect. I don't suppose you know of a simpler approach using this method?

‎05-29-2024

This has also been tested using python in notebook on AGOL with no luck using the Contingent Values toolset

‎03-11-2024

Sorry Russ - I cant share that one.

‎03-05-2024

Hi Shane, Only tested on the new map viewer - if I open in classic would i lose the group layers? Many. Could be 200 layers Not on new small ones Will report back than on that. I dont want to manually recreate the map though for obvious reasons. thanks joe

‎03-05-2024

Has anyone else experienced reduced performance in existing MapViewer maps since the recent February 2024 update? Maps which had a lot of layers on but overall performed fine prior to the update, are now resulting in very slow speeds to load and render.

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My Ideas

Latest Contributions by JoeNunn

Allow ability to toggle Search Layers function in Layer List in MapViewer to increase performance

Performance reduced in MapViewer with Search Layers input

Re: Support Proportional Symbology (Based off Distance Units) - ArcGIS Online

Re: Sweet for ArcGIS - zoom/pan to next feature

Sweet for ArcGIS - zoom/pan to next feature

Re: Arcade - Spatial reference expected

Freehand Stylus feature

Re: item.copy_feature_layer_collection fails

Re: item.copy_feature_layer_collection fails

item.copy_feature_layer_collection fails

Re: clone_items() Behavior has changed

Re: Allow Contingent values to be duplicated between feature layers and created in ArcGIS Online

Re: Performance issues in MapViewer since February 2024 updates

Re: Performance issues in MapViewer since February 2024 updates

Performance issues in MapViewer since February 2024 updates

Allow ability to toggle Search Layers function in ...

Performance reduced in MapViewer with Search Layer...

Freehand Stylus feature

Re: item.copy_feature_layer_collection fails

Performance issues in MapViewer since February 202...