什么是AngularJS $$阶段？ [英] What is $$phase in AngularJS?

问题描述

我发现这个code段是一个角指令有人写了自举模式的一部分。

I found this code snippet which is part of a angular directive someone wrote for bootstrap modal.

//Update the visible value when the dialog is closed                                                                                                                                                                                                            
                //through UI actions (Ok, cancel, etc.)                                                                                                                                                                                                                         
                element.bind("hide.bs.modal", function () {                                                                                                                                                                                                                     
                    scope.modalVisible = false;                                                                                                                                                                                                                                 
                    if (!scope.$$phase && !scope.$root.$$phase)                                                                                                                                                                                                                 
                        scope.$apply();                                                                                                                                                                                                                                         
                });  

我了解，这部分是针对双向下半年绑定，我们绑定到hide.bs.modal事件和更新模式时，用户界面​​的变化。

I understood that this part is for the latter half of two way binding we bind to hide.bs.modal event and update modal when UI changes.

我只是想知道为什么这个人打电话申请前检查范围和rootScope $$阶段？

I just wanted to know why is the person checking $$phase for scope and rootScope before calling apply ?

我们不能通俗易懂打电话申请？

Can't we straightaway call apply ?

什么是$$阶段在这里？

What is $$phase here?

我试图寻找了很多，找不到任何很好的解释。

I tried searching a lot, couldn't find any good explanation.

编辑：

我发现在那里我看到的例子：
<一href=\"http://stackoverflow.com/questions/19644405/simple-angular-directive-for-bootstrap-modal\">Simple为引导模态角指令

推荐答案

$$阶段的同时角度设置的标志是在 $消化周期

$$phase is a flag set while angular is in a $digest cycle.

有时（在少数情况下），你要干什么之前 $适用 $$阶段的范围>。

Sometimes (in rare cases), you want to check $$phase on the scope before doing an $apply. An error occurs if you try to $apply during a $digest:

错误：$申请已经在进行中

Error: $apply already in progress

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