NG-秀与UnderscoreJS的工作_.isNull但VAL工作===空 [英] ng-show not working with UnderscoreJS's _.isNull but works with val === null

问题描述

我有与NG-显示指令的元素，当我使用UnderscoreJS辅助函数_.isNull它的工作同样是为使用标准===运算符。

I've got an element with an ng-show directive and when I use the UnderscoreJS helper function _.isNull it work the same was as using the standard === operator.

因此​​，这显示与newJobWorkPercentage内容为空。

So this displays the content with newJobWorkPercentage is null.

<div class="form-group" ng-show="newJobWorkPercentage === null">
 ... some content
</div>

但这并不

<div class="form-group" ng-show="_.isNull(newJobWorkPercentage)">
 ... some content
</div>

我可以只使用===我的应用程序，我只是好奇为什么助手无法正常工作。

I can just use the === in my app, I'm just intrigued why the helper doesn't work.

推荐答案

角前pressions只针对评估该视图的 $范围。因此，要使用下划线在你看来，你需要把它添加到 $范围变量控制器内的：

Angular expressions are only evaluated against the $scope of that view. So to use underscore in your view you would need to add it to the $scope variable inside your controller:

$scope._ = _;

现在你就可以使用里面的前pressions下划线功能。

Now you will be able to use the underscore functions inside expressions.

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