有人可以为AngularJS中的范围提供$ destroy事件的示例吗? [英] Can someone provide an example of a $destroy event for scopes in AngularJS?

问题描述

有人可以提供范围$ destroy事件的示例吗?这是来自 http://docs.angularjs.org/api的参考文档/ng.$ro​​otScope.Scope#$destroy

Can someone please provide an example of scope's $destroy event? Here is the reference documentation from http://docs.angularjs.org/api/ng.$rootScope.Scope#$destroy

$ destroy()

从父级移除当前范围(及其所有子级) 范围.删除意味着对$ digest()的调用将不再 传播到当前范围及其子级.删除也意味着 当前范围可以进行垃圾回收.

Removes the current scope (and all of its children) from the parent scope. Removal implies that calls to $digest() will no longer propagate to the current scope and its children. Removal also implies that the current scope is eligible for garbage collection.

$ destroy()通常由ngRepeat等指令使用，用于 管理循环的展开.

The $destroy() is usually used by directives such as ngRepeat for managing the unrolling of the loop.

就在销毁示波器之前，会在$广播上广播$ destroy事件 这个范围.应用程序代码可以注册$ destroy事件处理程序 这将使它有机会执行任何必要的清理.

Just before a scope is destroyed a $destroy event is broadcasted on this scope. Application code can register a $destroy event handler that will give it chance to perform any necessary cleanup.

推荐答案

演示: http://jsfiddle.net/sunnycpp/u4vjR/2/

在这里，我创建了 handle-destroy 指令.

Here I have created handle-destroy directive.

ctrl.directive('handleDestroy', function() {
    return function(scope, tElement, attributes) {        
        scope.$on('$destroy', function() {
            alert("In destroy of:" + scope.todo.text);
        });
    };
});

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