var app = angular.module('myApp', []); 
app.service("$swl", function() { 
this.after = function(data) { 
return "("+data + " after,$swl"; 
}; 
this.before = function(data) { 
return "($swl,before " + data+")"; 
} 
})

<div ng-app="myApp" ng-controller="myCtrl"> 
{{name }} 
</div>

app.controller("myCtrl", function($scope, $swl,$timeout) { 
$scope.name = $swl.before("swl"); 
$timeout(function(){ 
$scope.name = $swl.after("swl"); 
},2000) 
})

<div ng-app="myApp" ng-controller="myCtrl"> 
{{name | before}} 
</div>

app.filter("before",["$swl",function($swl){ 
return function(data){ 
return $swl.before("(filter,"+data+")"); 
} 
}])