Get Fields ?

[Drew]

Hello,
I am doing a small ESRI JS API project and don't use it too often so the library is new to me..
Anyways.. I cant find anyway to get field information.

I am trying to write a function that will determine what the the OBJECTID field name is based on its data type (esriFieldTypeOID)

The object is in the documentation (Field) but I can't find a way to get a field?

In the Flex API you can call a a function like so...

mapServiceLayer.getLayerDetails(...)

Please help me get a fields array.

Drew

[AlexGray]

Hello,
I am doing a small ESRI JS API project and don't use it too often so the library is new to me..
Anyways.. I cant find anyway to get field information.

I am trying to write a function that will determine what the the OBJECTID field name is based on its data type (esriFieldTypeOID)

The object is in the documentation (Field) but I can't find a way to get a field?

In the Flex API you can call a a function like so...

mapServiceLayer.getLayerDetails(...)

Please help me get a fields array.

Drew

Drew,

I just learned about that myself not too long ago.. you can try taking a look at my work in progress.. http://www.co.frederick.va.us/planning/newmap1copy2.html

the layer referencing works.. I am a bit stuck on how to get the checkboxes to work properly though.. decided to go with checkboxes instead of link I had before..

Hope that helps..
Alex

[Drew]

Alex,

I don't quite see any code that is pulling field information from a layer.
Maybe I am missing it just like how I can't find it in the ESRI doc's either..
Can you point me to a line number in your source?

Basically I want to get an array of Fields from a given layer (i.e. Parcels)

Drew

[AlexGray]

Drew,

Sorry about that.. I miss read your question..

I did a little research and found a few things.. Although you might have already seen them..

In the JS api there is a property for esri.layers.featurelayer(objectIdField)

There is also a 'fields' property for featurelayer 'Field[]'.. the description for it states "The array of fields in the layer."

http://help.arcgis.com/en/webapi/javascript/arcgis/help/jsapi_start.htm#jsapi/featurelayer.htm

Sorry, I couldn't provide you with any code samples.. as I am just learning programming/javascript now in order to make myself more marketable.. Hope what I provided was of some help..

Alex

[ReneRubalcava]

I'm not too familiar with the Javascript API, so there may be a function for this built in, but you could pull the REST in JSON for any layer in a service like this
http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Petroleum/KGS_OilGasFields_Kansas/MapServ...

Than you can iterate through the "fields" element which is an array of objects that has a "type" element that will tell you what type the field is. I find that for some needs, it's just easier for me to make REST requests to get that kind of detailed information.

[Drew]

Thanks Alex. I think I can work with this!

Drew

[AlexGray]

Thanks Alex. I think I can work with this!

Drew

Drew,

Great.. Not a problem..

Alex

[Drew]

After testing the "FeatureLayer" functionality this morning i realized that its not what i need.
Its more for overlaying the data.

Isn't there a way I can get the Fields and their data types from a specific feature class using the JS API?

Drew

[timgogl]

im new to the esri stuff myself, so this may or may not be of any use to you. have you looked at the task object? inside task is featureset which has the property fieldaliases :

fieldAliases  Object  Set of name-value pairs for the attribute's field and alias names.

dont know if that is exactly what you are looking for, but maybe it will move you along some more.

[AlexGray]

Looks like you can get field dataypes from 'esri.layers.field.type'

type String The data type of the field.

http://help.arcgis.com/en/webapi/javascript/arcgis/help/jsapi_start.htm#jsapi/field.htm#type