ng-show and ng-hide not binding to given variable in angularjs -

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i using ng-show , ng-hide show banner page. when logged in wanna show different banner logged out. have 2 div ng-show , ng-hide value changing in controller true , false.

html code:

first banner:

<div id="firstpageheader" class="navbar navbar-inverse" role="navigation" ng-show={{display}}>

second banner:

<div id="restpageheader" class="navbar-header" ng-hide={{display}}>

controller:

var logincontroller = function($scope){

$scope.display = true; $scope.loginuser = function(credentials){ console.log(credentials.username); $scope.display = false; }  $scope.logout = function(){ console.log('logout'); $scope.display = true; }

so here according login , logout display value change true , false not happening value remains true. want know why value not getting changed used $scope.$apply()

ngshow , nghide directives expect expressions. should without curly braces {{ (which used expression interpolation):

ng-show="display"

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