How to Create Custom Lookup View in CRM

Today I am going to tell you how to do filter lookup field using JavaScript.

Here you need to do two things:

1. Get the filtered data in the form of fetchXML as per the your requirement.
   
   
2. You will need to create a custom look view. (You are going to click 'View more records,' if you dont have it will throw an error so you need to create custom lookup view)

So here...

1. My requirement is On Entity Custom3 I have two fields,
   
   lookup field Custome1 (lookup to Custome1 entity) and lookup field Custome2 (lookup to Custome2 entity).
   
   Lookup field Custome1 should get filtered by lookup field Custome2.
   
   (Entity Custome1 is having N:1 relationship with Entity Custome2)
   
   I have code ready we can use it:
   

   getFetchXMLData: function(entityLogicalName, attibute, attributeValue)
   {
       /// <summary>
       /// Generates the XML for entity with conditions
       /// </summary>
       /// <param name="entityLogicalName" type="string">
       /// Entity logical name
       /// </param>
       /// <param name="attibute" type="string">
       /// Attribute name for filter
       /// </param>
       /// <param name="attributeValue" type="string">
       /// Attribute value for filter
       /// </param>
       /// <returns type="Xml"> Xml Records</returns>
       var condition = null;
       if (attibute != null || attributeValue != null) condition = " <filter type='and'> " +
           " <condition attribute='" + attibute + "' operator='eq' value='" + attributeValue + "' /> " +
           " </filter> "
       var fetchXml = "<fetch version='1.0' output-format='xml-platform' mapping='logical' distinct='true' >" +
           "<entity name='" + entityLogicalName + "' >" + condition +
           "</entity>" +
           "</fetch>"
       return fetchXml;
   }

2. Now the second step: We have filtered data and we need to create a custom lookup view.
   
   I have code ready that can be used here:
   

   createCustomLookupView: function(columnsForCustomLookup, entityLogicalName, fieldName, viewDisplayName, fetchXml)
   {
       /// <summary>
       /// A function to Create a custom lookup view
       /// </summary>
       /// <param name="columnsForCustomLookup" type="Array">
       /// An array list of columns for view
       /// </param>
       /// <param name="entityLogicalName" type="String">
       /// Entity logical name
       /// </param>
       /// <param name="fieldName" type="String">
       /// Field Name view be shown
       /// </param>
       /// <param name="viewDisplayName" type="String">
       /// Display name of view
       /// </param>
       /// <param name="fetchXML" type="Xml">
       /// XMl result
       /// </param>
       var columns = "";
       for (var i = 0; i < columnsForCustomLookup.length; i++)
       {
           columns += "<cell name='" + columnsForCustomLookup[i] + "' width='150' />";
       }
       var layoutXml = "<grid name='resultset' object='1' select='1' icon='1' preview='1'>" +
           "<row name='result' id='" + entityLogicalName + "id'>" + columns +
           "</row>" +
           "</grid>";
       // add the randomly generated GUID for the view id
       var viewId = "{00000000-0000-0000-0000-000000000001}";
       Xrm.Page.getControl(fieldName).addCustomView(viewId, entityLogicalName, viewDisplayName, fetchXml, layoutXml, true);
   }

   Now on change event of lookup Custome2 field I can call the methods:
   

   onCustome2Change: function(context)
   {
       var guidOfCustome2;
       var lookup = Xrm.Page.data.entity.attributes.get(Custome2);
       if (lookup != null)
       {
           var lookUpObjectValue = lookup.getValue();
           if ((lookUpObjectValue != null))
           {
               guidOfA = lookUpObjectValue[0].id;
           }
       }
       if (guidOfA == null) return;
       var fetchXML = getFetchXMLData(logicalNameOfCustom1, Custome2, guidOfCustome2)
           //Creates the custom lookup view
       createCustomLookupView([name, phone], logicalNameOfCustom1, Custome1, " Custom Lookup View Name", fetchXml);
   }

Hope this will help you to get your work done.

If you have any issues with the code, please comment below and suggestions are welcomed.