angular orderBy multiple fields has syntax errors - angularjs

Question

I am trying to use angular orderBy to order multiple fields, but i get syntax error as:
Syntax error, unrecognized expression: div[ng-repeat='r in
vm.GetRequests() | filter: vm.SearchText |
orderBy:['LastName','FirstName']']
It seems there appears additional sign ']', but i do not have it in html
The html looks like:
<div ng-repeat="r in vm.GetRequests() | filter: vm.SearchText |orderBy:'RequestedOn'| orderBy:['LastName','FirstName']">
{{r.LastName}} : {{r.FirstName}}
</div>
the function GetRequests() returns a array of object as following:
[{FirstName:"Test1", LastName:"First"},{FirstName:"Test2",LastName:"Second"},{FirstName:"Test3",LastName:"Third"}]
Can anyone help me for the problem?
Changing HTM - remove orderBy: 'RequestedOn'
<div ng-repeat="r in vm.GetRequests() | filter: vm.SearchText | orderBy:['LastName','FirstName']">
{{r.LastName}} : {{r.FirstName}}
</div>
but i still get syntax error:
Uncaught Error: Syntax error, unrecognized expression: div[ng-repeat='r in vm.GetRequests() | filter: vm.SearchText | orderBy:['LastName','FirstName']']
UPDATE
The syntax seems comes from a browserlink, because the order works goed when i get the error.
And recommend to put all order property in a array
Thanks a lot for the inputs all of you, especially thanks for RishiPrakash :)

Answer 1

I think that filter only works on arrays and doesn't evaluate functions.
I would assign the request to a scope variable in the controller:
js:
$scope.requests = vm.GetRequests();
html:
<div ng-repeat="r in requests | filter: vm.SearchText | orderBy:['RequestedOn','LastName','FirstName']"> {{r.FirstName }}, {{r.LastName}} </div>
note: I don't think there's a problem with the way you sort your array, although I prefer combining them in one orderBy expression as Rishi Prakash suggested.

Answer 2

try <div ng-repeat="r in vm.GetRequests() | filter: vm.SearchText() | orderBy:['RequestedOn','LastName','FirstName']">
filter:vm.SearhText must be a function so () in end of it.