Filter the Lookup feild data based on some condition

We may have some requirement that we do not want to show all data of the lookup to every one.

I have some scenario as below :

I have the Master custom list named OfficeMaster and I use the lookup using this in Child list 'FacilityStatus'.

OfficeMaster Custom also had one more column named OfficeAdmin , which have the office Admin name, who can add data for this office.

In that, I just want to show that Office To admin , which office is assigned to him in the OfficeMaster List.

For that, I used the SPServices named "SPFilterDropdown()".

So, when Office Admin Login into the site, he can only see that offices whom Admin he is.

$().SPServices.SPFilterDropdown({
                                                  relationshipList: "OfficeMaster",
                                                  relationshipListColumn: "OfficeLocation",
                                                  columnName: "OfficeName",                                                                                                
                                                                                             
                                                  CAMLQuery: "<Eq><FieldRef Name='OfficeAdmin' /><Value Type='User'>"+username+"</Value></Eq>",
                                                  completefunc: null,
                                                  debug: true
                                                });
 
 

Here , username parameter is used which uses the users username. I am using the ECMA script for that and put that code above that.

this.context= SP.ClientContext.get_current();

            if (this.context!= undefined && context!= null) {

//assume we have a client context called context.

var web = context.get_web();

var user = web.get_currentUser(); //must load this to access info.

context.load(user);

//alert('start In Middle');

context.executeQueryAsync(function(){

  // alert("User is: " + user.get_title()); //there is also id, email, so this is pretty useful.

   

   username=user.get_title();

}, function(){alert(":(");});

}