Filter layer inside webmap

IonutAlixandroae3

Hi all,

Is there a posibility to filter an operational layer inside a webmap (similar to what definition query does in ArcMap) and after to save the webmap with the new updates?

I`m at the step where I iterate through my layers from my map but I cannot find the solution to apply a filter/definition query to them.

Thanks,

Ionut

JeffBigos

Thanks for looking at that a bit more, The code I had on there was for applying the filter to the featurelayer.

Below is another code block for how you can access a web map isolate a layer in a webmap and change the filter.

To test the code below:

1. create a basic webmap in your organization titled TimeZoneRegions
2. Add the following featurelayer to the map  Layer: World Regions (ID: 2) 
3. Save the map

The one Dependency of the code below is the WorldTimeZones - World Regions operational layer in the webmap needs to have a filter set already.

There is a block of code below that will check to see if a Layerdefinition exists on the operational layer before it gets applied:

if 'layerDefinition' in tZoneLyr:

Code:

from arcgis.gis import GIS
import copy
from json import dumps
from json import JSONDecoder
from arcgis.mapping import WebMap


#Connect to the Organization
gis = GIS("https://www.arcgis.com", "<UserName>", "<passW>")


#Search for the webmap
webmapPub = gis.content.search("title:TimeZoneRegions",item_type = "Web Map")


#Use a list comprehension to find the right one you are updating
timeZoneWebMap = [wmap for wmap in webmapPub if wmap.title == 'TimeZoneRegions'][0]


#Get the webmap json
pubMapJson = timeZoneWebMap.get_data(try_json=True)


# Filter Expression to apply to layer
lyrFilter = "REGION = '{0}'".format("Antarctica")


#Make a deepcopy of the json to modify
fldMapJsonCopy = copy.deepcopy(pubMapJson)


#List comprehension to find the one layer you need to modify by title
#Here you could loop on all layers to modify the filter too.
lyrT = [l for l in pubMapJson['operationalLayers'] if l['title']== 'WorldTimeZones - World Regions']



if len(lyrT) >0:
    tZoneLyr = lyrT[0]
    if 'layerDefinition' in tZoneLyr:
       z = [[x, y] for x, y in enumerate(pubMapJson['operationalLayers']) if y['title'] == 'WorldTimeZones - World Regions'][0]
       fldMapJsonCopy['operationalLayers'][z[0]]['layerDefinition']['definitionExpression'] = lyrFilter



#Save the changes to the Webmap
timeZoneWebMap.update(item_properties={'text':dumps(fldMapJsonCopy)})