Populate lookup value on selection of another lookup

I had client requirement that on the selection of City (lookup), Region and Sub Region should be populated automatically which is read only field. To achieve this we mapped the city with region (lookup) and sub region (lookup) on the city entity. After writing below code I was getting following error.

There was an error with this field’s customized event.



Error:’ new_subregionid.value ‘ is null or not an object

I solved the issue with help of this link and answer posted by Adi Katz .

“The keyValues are only available when you use the lookup dialog. The form assistant does not contain the columns that are retrieved by the lookup and this is why the items array is empty.”

For details please visit below link.


After this solution I added Sub Region field to lookup dialog (lookup view) and this solve my issue.

Put below code on OnChange of City Lookup field.

/*****Auto Populate SubRegion on Selection of City field******************/

if (crmForm.all.new_cityid.DataValue==null)

crmForm.all.new_subregionid.DataValue = null;



var lookup_guid;

var lookup_name;

var lookup_type;

var lookup_typename;

var lookupItem = new Array;

lookupItem = crmForm.all.new_cityid.DataValue;





var subRegionName;

if(crmForm.all.new_cityid.items != null)

var lookupValues = crmForm.all.new_cityid.items[0].keyValues;
subRegionName = lookupValues.new_subregionid.value? lookupValues.new_subregionid.value : null;

subRegionName = null;


var subregionidvalue = GetAttributeValueFromID(lookup_typename, lookup_guid, ‘new_subregionid’);

if(subregionidvalue != null)

var subregionlookupData = new Array();

//Create an Object add to the array.

var subregionlookupItem = new Object();

//Set the id, typename, and name properties to the object.

subregionlookupItem.id = subregionidvalue;

regionlookupItem.typename = ‘new_subregion’;

regionlookupItem.name = subRegionName ;

// Add the object to the array.

subregionlookupData[0] = subregionlookupItem;

// Set the value of the lookup field to the value of the array.

crmForm.all.new_subregionid.DataValue = subregionlookupData;

crmForm.all.new_subregionid.ForceSubmit = true;


function GetAttributeValueFromID(sEntityName, sGUID, sAttributeName)


var sXml = “”;

var oXmlHttp = new ActiveXObject(“Msxml2.XMLHTTP.6.0”);

var serverurl = “”;

//set up the SOAP message

sXml += “<?xml version=\”1.0\” encoding=\”utf-8\” ?>”;

sXml += “<soap:Envelope xmlns:soap=\”http://schemas.xmlsoap.org/soap/envelope/\””;

sXml += ” xmlns:xsi=\”http://www.w3.org/2001/XMLSchema-instance\””;

sXml += ” xmlns:xsd=\”http://www.w3.org/2001/XMLSchema\”>”;

sXml += “<soap:Body>”;

sXml += “<entityName xmlns=\”http://schemas.microsoft.com/crm/2006/WebServices\”>” + sEntityName +


sXml += “<id xmlns=\”http://schemas.microsoft.com/crm/2006/WebServices\”>” + sGUID + “</id>”;

sXml += “<columnSet xmlns=\”http://schemas.microsoft.com/crm/2006/WebServices\””;

sXml += ” xmlns:q=\”http://schemas.microsoft.com/crm/2006/Query\””;

sXml += ” xsi:type=\”q:ColumnSet\”><q:Attributes><q:Attribute>” + sAttributeName +


sXml += “</soap:Body>”;

sXml += “</soap:Envelope>”;

// send the message to the CRM Web service

oXmlHttp.open(“POST”, serverurl + “/MsCrmServices/2006/CrmService.asmx”,false);


oXmlHttp.setRequestHeader(“Content-Type”, “text/xml;charset=utf-8”);

oXmlHttp.setRequestHeader(“Content-Length”, sXml.length);


// retrieve response and find attribute value

// retrieve the given attribute name in any XML namespace

var result = oXmlHttp.responseXML.selectSingleNode(“//*[local-name()=\”” +  sAttributeName +”\”]”);

if (result == null)


return “”;




return result.text;




Author: Arvind Singh

Solution Architect with 15+ years of exp. Dynamics CRM, Power Platform, Azure which includes Solution, Design, Development, Deployment, Maintenance and support experience.

One thought on “Populate lookup value on selection of another lookup”

  1. Hi…
    I found ur article usefull but didnt get success to complete my task which is similar that u perform here…
    In my case i have 3 custom entities new_districtid,new_blockid,new_villageid(N:1 relationship)…i got success to filter the blockid look up according to corresponding district…and also same for village lookup filter related to corresponding blockid lookup…

    but now i want to filter the district when any on select another block after searching from new_blockid lookup look for box


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