Angularjs 过滤器被否定 [英] Angularjs filter negated

问题描述

我有一组要在 ng-repeat 中过滤的项目，使用 ng-model 作为字符串来过滤该集合，到目前为止，我还没有找到在表达式被否定时使其工作的方法，我正在做这样的事情:

I have a set of items that I want to filter in ng-repeat using an ng-model as the string to filter the set, so far I haven't found a way to make it work when the expression is negated, I'm doing something like this:

<select ng-model="languageOrigin" ng-change="updatePrice()">
             <option ng-repeat="language in languages">{{language}}</option>
</select>
<select ng-model="languageDestination" ng-change="updatePrice()">
            <option ng-repeat="language in languages | filter:!languageOrigin">{{language}}</option>
</select>

在文档中，它说我们应该使用 !否定表达式但仍然没有运气.

In the documentation, it says that we should use ! to negate the expression but still no luck.

我做错了什么?

推荐答案

'!'字符前置到过滤器字符串，如下所示:

'!' character prepend to the filter string, like below:

过滤器:'!'+languageOrigin

filter:'!'+languageOrigin

<select ng-model="languageOrigin" ng-change="updatePrice()">
  <option ng-repeat="language in languages">{{language}}</option>
</select>
<select ng-model="languageDestination" ng-change="updatePrice()">
  <option ng-repeat="language in languages | filter:'!'+languageOrigin">{{language}}</option>
</select>

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