Angularjs指令删除看？ [英] Angularjs directive remove watch?

问题描述

我有一个 $范围。$手表指令的控制器声明。当我更改页面和指令被删除我必须手动销毁的方式吗？如果是这样，我怎样检测时，该指令已被删除？

I have a $scope.$watch declared in the controller of a directive. When I change pages and the directive is removed do I have to manually destroy the way? If so how do I detect when the directive has been removed?

推荐答案

这取决于范围，而不是指令。如果范围被破坏，那么它所有的$观察家死它。在页面更改scope'll由角被破坏，所以你应该是安全的。

It depends on the scope, not the directive. If the scope is destroyed, then all its $watchers die with it. On page change your scope'll be destroyed by angular, so you should be safe.

在一个范围内死亡，产生了$破坏事件。你可以看它：

When a scope dies it yields a $destroy event. You can watch it:

$scope.$on('$destroy', callback);

和可以手动分离$观察家从范围，通过调用它返回的功能：

and you can manually detach $watchers from the scope, by calling the function it returns:

var sentinel = $scope.$watch('expression', callback);
sentinel(); // kill sentinel

您可以在使用过$做到这一点。

You can do this with $on too.

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