AngularJS:ng-show/ng-hide不适用于`{{}}`插值 [英] AngularJS: ng-show / ng-hide not working with `{{ }}` interpolation
问题描述
我正在尝试使用 AngularJS 提供的ng-show和ng-hide函数显示/隐藏一些HTML. .
I am trying to show / hide some HTML using the ng-show and ng-hide functions provided by AngularJS.
根据文档，这些功能的各自用法如下:
According to the documentation, the respective usage for these functions are as follows:
ngHide – {表达式}-如果表达式为true，则分别显示或隐藏该元素. ngShow – {expression}-如果表达式为真，则分别显示或隐藏该元素.
ngHide – {expression} - If the expression truthy then the element is shown or hidden respectively. ngShow – {expression} - If the expression is truthy then the element is shown or hidden respectively.
这适用于以下用例:
<p ng-hide="true">I'm hidden</p>
<p ng-show="true">I'm shown</p>
但是，我们应该使用对象中的参数作为表达式，然后给ng-hide和ng-show赋予正确的true/false值，但是这些值不会被视为布尔值，因此始终返回false:
However, should we use a parameter from an object as the expression then the ng-hide and ng-show are given the correct true/false value but the values are not treated as a boolean so always return false:
来源
<p ng-hide="{{foo.bar}}">I could be shown, or I could be hidden</p>
<p ng-show="{{foo.bar}}">I could be shown, or I could be hidden</p>
结果
<p ng-hide="true">I should be hidden but I'm actually shown</p>
<p ng-show="true">I should be shown but I'm actually hidden</p>
这是一个错误，或者我没有正确执行此操作.
This is either a bug or I am not doing this correctly.
我找不到将对象参数作为表达式引用的任何相关信息，所以我希望对AngularJS有更好理解的任何人都可以对我有所帮助?
I cannot find any relative information on referencing object parameters as expressions so I was hoping anyone with a better understanding of AngularJS might be able to help me out?
推荐答案
foo.bar参考不应包含大括号:
The foo.bar reference should not contain the braces:
<p ng-hide="foo.bar">I could be shown, or I could be hidden</p>
<p ng-show="foo.bar">I could be shown, or I could be hidden</p>
Angular 表达式必须位于大括号绑定中，其中Angular
Angular expressions need to be within the curly-brace bindings, where as Angular directives do not.
另请参见了解角度模板.
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