angular.js 过滤器的反极性 [英] Reverse polarity of an angular.js filter

问题描述

给定一个过滤器方法，它在满足某些条件时返回 true，是否可以在 HTML 中调用它的对立面，例如使用:

Given a filter method that returns true if some condition is met, is it possible to invoke its opposite in HTML, e.g. to use:

"item in items | filter:!AllDay"

代替

"item in items | filter:AllDay"

?或者您是否必须维护两种单独的过滤器方法(一种用于 false，一种用于 true)?

? Or do you have to maintain two separate filter methods (one for false and one for true)?

推荐答案

正如 ENDOH(这个问题在技术上是重复的)，您可以通过在前面加上 '!' 来否定过滤器到过滤器字符串，如下所示:

As noted by ENDOH (this SO question is technically a duplicate), you can negate a filter by prepending '!' to the filter string, like this:

filter:'!'+myFilter

注意'!'被引用.documentation 在这方面不是很清楚，有一个例子会有帮助.

Note that the '!' is quoted. The documentation is not terribly clear on this, and an example there would be helpful.

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