How to show ionicPopover by default

How to show ionicPopover by default, don't click or any other event. Once the page or the view loaded, show the popover?

cmr.controller('JoinMeeting', function($scope, $ionicPopover) {
    $ionicPopover.fromTemplateUrl('joinMrTips.html', {
    scope: $scope,
}).then(function(popover) {
    $scope.popover = popover;
});

$scope.$on('$viewContentLoaded',function(){
    $scope.popover.show();
});

})

You were very close. According to the official documentation of IonicPopover, The syntax of popover.show() is as follows :

show($event) where The $event or target element which the popover should align itself next to

Hence, rewriting your code as follows will do the job : 

$scope.$on('$viewContentLoaded',function(){
    $scope.popover.show(".class-of-host-control-of-popup");
});

Complete Example, along with code --> here