show popover on input validation in angularjs -


i want input validation in angularjs. showing bootstrap popover(https://angular-ui.github.io/bootstrap/#/popover) on when invalid. cannot figure out how trigger popover.

 user name:    <input type="text" name="username" ng-model="user.name" popover="m here"  popover-trigger="myform.username.$error.required" required>

the [plunker] : http://plnkr.co/edit/pwgquzxzhacvyekebc2o?p=preview

to trigger popover using custom conditions have use $tooltipprovider

by default can trigger popover : mouseenter, mouseleave, click, focus,blur

so have define custom triggers, shown here : http://plnkr.co/edit/0weqzz?p=preview 

 angular.module('myapp',['ui.bootstrap'])   .config(['$tooltipprovider', function($tooltipprovider){     $tooltipprovider.settriggers({'customevent': 'customevent'});  }]);  angular.module('myapp').controller('mycontroller', ['$scope','$timeout',   function($scope, $timeout) {     $scope.firecustomevent = function() {     $timeout(function() {       $('#tooltiptarget').trigger('customevent');     }, 0); } }]);

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