Filtering multiple custom CRM Lookup

Let me explain the scenario..

We have a Model lookup and a variant Lookup on Lead form. Every variant is associated with a particular model. i.e One model have multiple Variant.

Model          Varient
Alto             Alto LX
Alto             Alto Xcite
Alto             Alto LXI
SX4               SX4 VXI
SX4               SX4 ZXI Leather
SX4               SX4 ZXI

Now Requirement is that when user select a model from Model lookup then only variant corresponding to selected model should be displayed to user when user click on variant lookup and disable the search in Variant lookup.

Write below code on Model OnChange event.

if(crmForm.all.new_modelid.DataValue != null )
var modelLookup=crmForm.all.new_modelid.DataValue;
var modelID=modelLookup[0].id;
var modelName=modelLookup[0].name;
var field=crmForm.all.new_variantid;

// Pass fetch xml through search value parameter
field.lookupbrowse = 1;
field.AddParam(“search”,”<fetch mapping=’logical’ distinct=’false’>”
+”<entity name=’new_varientmaster’>”
+”<attribute name=’new_varientmasterid’/>”
+”<attribute name=’new_name’/><attribute name=’createdon’/>”
+”<order attribute=’new_name’ descending=’false’/><filter type=’and’>”
+”<condition attribute=’new_modelnameid’ operator=’eq’ uiname='”+ modelName
+”‘ uitype=’new_modelmaster’ ”
+”value='”+ modelID +”‘ />”


Note: Put below code if not already exist

The following code needs to be inserted anywhere in the <CRM site folder>\_controls\lookup\lookupsingle.aspx file if not already exist (if you have already code for filtering lookup)..

<script runat=”server”>
protected override void OnLoad( EventArgs e )
crmGrid.PreRender += new EventHandler( crmgrid_PreRender );

void crmgrid_PreRender( object sender , EventArgs e )
// As we don’t want to break any other lookups, ensure that we use workaround only if
// search parameter set to fetch xml.
if (crmGrid.Parameters[“search”] != null && crmGrid.Parameters[“search”].StartsWith(“<fetch”))
crmGrid.Parameters.Add(“fetchxml”, crmGrid.Parameters[“search”]);

// searchvalue needs to be removed as it’s typically set to a wildcard ‘*’

// and then select it.
this._showNewButton = false;


For details  about lookupsingle.aspx code visit below link.

For Reference: Model is custom entity (new_modelmaster) which contains name attribute (i.e Model Name) and Variant is custom entity (new_variantmaster) which contain name attribute( variant Name ) and Model lookup(new_modelnameid) to map model with variant.

For building FetchXml Query find below link.

Enjoy J

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