JAVASCRIPT

settimeout in angular

// var that = this;                             // no need of this line
this.messageSuccess = true;

setTimeout(()=>{                           //<<<---using ()=> syntax
      this.messageSuccess = false;
 }, 3000);

angular timeout function

// var that = this;                        // no need of this line
this.messageSuccess = true;

setTimeout(()=>{                           // <<<---using ()=> syntax
    this.messageSuccess = false;
}, 3000);

timeout angularjs

var myapp = angular.module("myapp", []);

myapp.controller("DIController", function($scope, $timeout){

    $scope.callAtTimeout = function() {
        console.log("$scope.callAtTimeout - Timeout occurred");
    }

    $timeout( function(){ $scope.callAtTimeout(); }, 3000);
});