什么是之间的差异！$质朴VS在angularjs $脏 [英] What's the differences between !$pristine vs $dirty in angularjs

问题描述

最近，我读了一些教程的angularJS表单验证，像这样的：

 ＆LT; p NG秀=$ userForm.email无效和放大器;＆安培;！userForm.email $质朴。＆GT;＆LT; / P＆GT;
 

但我觉得！$质朴和 $脏都是平等的，所以我可以用下面的一个呢？

 ＆LT; p NG秀=$ userForm.email无效和放大器;＆安培; userForm.email $脏＆GT;＆LT; / P＆GT;
 

解决方案

我觉得有这两个属性之间的细微差别，这取决于你的使用情况。

$使用setDirty（）;
设置形式脏状态。
这种方法可以称为加入'NG-脏'类，并设置形式脏状态（NG-脏类）。这种方法也将传播到父窗体。

$ setPristine（）;
设置形式到它的原始状态。
这种方法可以称为以删除'NG-脏'类和表单设置为它的原始状态（NG-原始类）。这种方法也将传播到包含在这种形式的所有控件。
设置窗体回原始状态往往是有用的，当我们想'重用'保存或复位后一种形式。

所以，你可以同时使用$原始和$以不同的方式变脏。虽然，您可以检查该文件由macrog在下面的文章中提到。

Recently I read some tutorial about angularJS form validation, like this:

<p ng-show="userForm.email.$invalid && !userForm.email.$pristine"></p>

but I think !$pristine and $dirty are equal, so can I use the below one instead?

<p ng-show="userForm.email.$invalid && userForm.email.$dirty"></p>

解决方案

I think there is a slight difference between these two attributes, which depends on your use case.

$setDirty(); Sets the form to a dirty state. This method can be called to add the 'ng-dirty' class and set the form to a dirty state (ng-dirty class). This method will also propagate to parent forms.

$setPristine(); Sets the form to its pristine state. This method can be called to remove the 'ng-dirty' class and set the form to its pristine state (ng-pristine class). This method will also propagate to all the controls contained in this form. Setting a form back to a pristine state is often useful when we want to 'reuse' a form after saving or resetting it.

So, you can use both $pristine and $dirty in a different way. Though, you can check the document as mentioned by 'macrog' in the below post.

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