The name for a field should be the same as the "id" property.
If you happen to be working from a field's event, you can always pass the execution context when defining the function and then in your event code use:
executionContext.getEventSource().getName();
http://msdn.microsoft.com/en-us/library/gg334332.aspx
If you need the schema name (mixed case) based on the field id/name (lower case) you can use something like this (based on http://crmxpg.nl/wp/2010/10/19/how-to-query-the-metadata-service-via-javascript)
function GetSchemaName() {
alert(gGetAttributeList(Xrm.Page.data.entity.getEntityName(), "thefieldname"));
}
//*********************************************************
gQueryMetadataService = function (request) {
var xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
xmlhttp.open("POST", '/mscrmservices/2007/MetadataService.asmx', false);
xmlhttp.setRequestHeader("Content-Type", "text/xml; charset=utf-8");
xmlhttp.setRequestHeader("SOAPAction", 'schemas.microsoft.com/.../Execute&);
var soapMessage = "<?xml version='1.0' encoding='utf-8'?>" +
"<soap:Envelope xmlns:xsi='www.w3.org/.../XMLSchema-instance& " +
"xmlns:xsd='www.w3.org/.../XMLSchema& xmlns:soap='schemas.xmlsoap.org/.../& +
"<soap:Header>" +
"<CrmAuthenticationToken xmlns='schemas.microsoft.com/.../WebServices& +
"<AuthenticationType xmlns='schemas.microsoft.com/.../CoreTypes& + AUTHENTICATION_TYPE +
"</AuthenticationType>" +
"<OrganizationName xmlns='schemas.microsoft.com/.../CoreTypes& + ORG_UNIQUE_NAME +
"</OrganizationName>" +
"<CallerId xmlns='schemas.microsoft.com/.../CoreTypes& +
"</CrmAuthenticationToken>" +
"</soap:Header>" +
"<soap:Body><Execute xmlns='schemas.microsoft.com/.../WebServices& + request +
"</Execute></soap:Body>" +
"</soap:Envelope>";
xmlhttp.send(soapMessage);
return xmlhttp.responseXML;
}
gGetAttributeList = function (entityName, fieldname) {
var request = "<Request xsi:type='RetrieveEntityRequest'>" +
"<MetadataId>00000000-0000-0000-0000-000000000000</MetadataId>" +
"<EntityItems>IncludeAttributes</EntityItems>" +
"<LogicalName>" + entityName + "</LogicalName>" +
"<IsCustomizable>1</IsCustomizable>" +
"<RetrieveAsIfPublished>true</RetrieveAsIfPublished>" +
"</Request>";
var result = gQueryMetadataService(request);
var schemaNames = result.selectNodes("//EntityMetadata/Attributes/Attribute/SchemaName");
for (var i = 0; i < schemaNames.length; i++) {
if (fieldname === schemaNames[i].text.toLowerCase()) {
return schemaNames[i].text;
}
}
return null;
}
