[AngularJS] Using the Angular scope $destroy event and method
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.
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