How do I obtain a list of all fields in a web service?

[DonaldCatanzaro]

Hi All,

I think this is an easy question but I cannot seem to find an API call that can return the list of fields in an ArcGIS web service. 

For instance, this webhttp://server.arcgisonline.com/ArcGIS/rest/services/Demographics/USA_Median_Household_Income/MapServ...

has the following fields:
[INDENT]OBJECTID
Shape
ID
NAME
ST_ABBREV
LANDAREA
TOTPOP_CY
MEDHINC_CY
HINCBASECY
HINC50_CY
HINC75_CY
HINC100_CY
HINC150_CY
HINC200_CY
MEDHHINC_pct_USAvg
HINC0_25
HINC35_50[/INDENT]

I basically want to be able to consume (dynamically) this list so I can put it into my UI.

Thank you in advance !

[RobertoPepato · Accepted solution]

Hi All,

I think this is an easy question but I cannot seem to find an API call that can return the list of fields in an ArcGIS web service. 

For instance, this webhttp://server.arcgisonline.com/ArcGIS/rest/services/Demographics/USA_Median_Household_Income/MapServ...

has the following fields:
[INDENT]OBJECTID
Shape
ID
NAME
ST_ABBREV
LANDAREA
TOTPOP_CY
MEDHINC_CY
HINCBASECY
HINC50_CY
HINC75_CY
HINC100_CY
HINC150_CY
HINC200_CY
MEDHHINC_pct_USAvg
HINC0_25
HINC35_50[/INDENT]

I basically want to be able to consume (dynamically) this list so I can put it into my UI.

Thank you in advance !

You need to specify from which layer you're interested in. A map service is a composition of many layers, each of them with a field set. You can access a specific layer from a MapService using and index based identifier in your url, like the following sample:

http://server.arcgisonline.com/ArcGIS/rest/services/Demographics/USA_Median_Household_Income/MapServer/1

You can query the fields of a specific layer using the property fields of a FeatureService object. See this link for more info.

[KellyHutchins]

pepatosp is correct - you need to query for the individual layer.   Here's a link to a sample in the help that shows how to do this:

https://developers.arcgis.com/javascript/jssamples/data_requestLayerInfo.html