gistfile1.txt

app.directive('filestyle', function() {
  return {
    restrict: 'A',
    scope: {
        "filestyle": "="
    },
    transclude : true,
    link : function($scope,$element,$attrs){
        $attrs.$observe('filestyle',function(value){
          if(typeof $scope.filestyle == "string"){
            $element.fileinput("<button type='button' class='btn btn-default'>" + $scope.filestyle + "</button>");
          } else {
            $element.fileinput("<button type='button' class='btn btn-default'>Choose file...</button>");
          }
        });
    }
  };
});