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With Angular scopes, you have access to a $destroy event that can be used to watch $scope events. This is used for cleanup, and gives you a final opportunity to access any data on a scope. Scopes also have a (rarely used) $destroy method that allows you to manually destroy a scope.
<!DOCTYPE html><html><head lang="en"> <meta charset="UTF-8"> <title></title> <link rel="stylesheet" href="bower_components/bootstrap/dist/css/bootstrap.css"/> <script src="//cdnjs.cloudflare.com/ajax/libs/angular.js/1.2.18/angular.js"></script> <script src="app.js"></script></head><body ng-app="demo" ng-init="isToggled = true"><div ng-if="isToggled"> <div ng-controller="MyCtrl as my"> Simple Form <input type="text" ng-model="my.person.firstName"/> <input type="text" ng-model="my.person.lastName"/> Welcome, {{ my.person.firstName }} {{ my.person.lastName }} <button ng-click="my.click()">Toggle</button> </div> <my-directive></my-directive></div><hr/></body></html>
angular.module("demo", []) .factory("person", function () { return { firstName: "John", lastName: "Lindquist" } }) .controller("MyCtrl", function ($scope, person) { var my = this; my.person = person; my.click = function () { $scope.$destroy(); } }) .directive("myDirective", function () { return { restrict: "E", scope: {}, template: "<div style=‘border: 1px solid black‘>My Directive</div>", link: function (scope) { scope.$on("$destroy", function () { console.log("directive destroy"); }) } } })
When you toggle ng-if, actually it triggle $scope.$destory.
Once $destory() is triggered, scope is destoried, no event and binding to the scope any more.
[AngularJS] Using the Angular scope $destroy event and method
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