为什么我需要`$ rootScope。$`申请在我的角度服务（）？ [英] Why do I need `$rootScope.$apply()` in my Angular Service?

问题描述

我在我的应用程序弹出模式服务名为覆盖。它只是翻转的 $ rootScope 的原因2指令一些布尔显示/隐藏适当。这里是展示一个新的模式时被调用的函数

I have a pop-up modal service in my application called Overlay. It simply flips some booleans on the $rootScope that cause 2 directives to show/hide appropriately. Here is the function that is called when showing a new modal

 overlay.NewGears = {
        show: function(msg){
            _displayBackground();

            scope.message = msg;
            scope.feedback = null;
            scope.url = '/partials/Common/gears.html';

            $rootScope.$apply(function(){
                $rootScope.modalVisible = true;
            });


        },
        hide: function(){
            _hideBackground();

            $rootScope.modalVisible = false;
        }
    };

正如你可以看到我显示不透明的背景，那么我成立了一个名为范围变量这就是后来传入通过DI我的指令。但后来我发现我的语气不是当它应该是出现在NEXT消化周期 modalVisible 变量设置为true后出现的，而是。然后我不得不添加 $适用（）分配各地得到它的工作。不过，我认为这时候我们是世界角外，才需要，那么为什么我需要这个我折角服务里面？

As you can see I display the opaque background, then I set up a variable called scope which is later passed into my directive via DI. But then I noticed that my modal was not appearing when it should, and instead was appearing on the NEXT digest cycle after the modalVisible variable was set to true. I then had to add the $apply() around the assignment to get it to work. However, I thought this is only needed when we are outside the "Angular world", so why do I need this inside of my Angular Service?

推荐答案

$适用是必要告诉角度的更改发生的范围。内置指令和服务，如 ngClick 或 $ HTTP 做内部。如果应用（原文如此！）变化的范围和不使用上述内置服务，那么你是负责调用 $适用自己。

$apply is necessary to tell angular that changes happened to the scope. Built-in directives and services like ngClick or $http do that internally. If you apply (sic!) changes to the scope and don't use the aforementioned built-in services, then you are responsible for calling $apply yourself.

所以，如果显示的 ngClick 处理程序内不叫，例如，那么你就需要调用 $适用自己。

So if show isn't called within an ngClickhandler, e.g., then you need to call $apply yourself.

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