javascript 如何使用 ng-checked 在 angularJs 中预选复选框
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How to pre-select checkbox in angularJs with ng-checked
提问by toy
I seem to cannot get this to work. So I have a bunch of genres of movies which I want them to be checked if those are the genres in user database. This is my code
我似乎无法让它发挥作用。所以我有一堆电影类型，我希望检查它们是否是用户数据库中的类型。这是我的代码
%section(ng-controller="UserCtrl" ng-init="user_genres=#{preferred_genres}")
%ul
%li(ng:repeat="genre in preferred_genres")
%input(type = "checkbox" ng:model="preferred_genres[genre]" id="genre-{{$index + 1}}" ng-checked="user_genres['{{genre}}']")
%label{:for => "genre-{{$index + 1}}"} {{genre}}
And this is #{preferred_genres}from haml
这是#{preferred_genres}来自haml
{"Action & Adventure":true,"Animation":true,"Art House & International":true,"Classics":true,"Comedy":true,"Documentary":true,"Drama":true,"Horror":true,"Kids & Family":true,"Musical & Performing Arts":true,"Mystery & Suspense":true,"Romance":true,"Science Fiction & Fantasy":true,"Special Interest":true,"Sports & Fitness":true,"Television":true,"Western":true}
So that means every checkbox should be checked. But no checkbox is checked when I load the page. However if I hardcode ng-checkedto be something like this it works.
所以这意味着每个复选框都应该被选中。但是当我加载页面时没有选中复选框。但是，如果我硬编码ng-checked成为这样的东西，它就可以工作。
ng-checked="user_genres['Western']"
This is really strange. Please help.
这真的很奇怪。请帮忙。
回答by dnc253
The value of ng-checkedneeds to be an expression. Get rid of the {{}}. So, something like this:
的值ng-checked需要是一个表达式。摆脱 {{}}。所以，像这样：
%input(type = "checkbox" ng-model="preferred_genres[genre]" id="genre-{{$index + 1}}" ng-checked="user_genres[genre]")
Also, you don't need to necessarily even have the ng-checkeddirective. If the value of your model is true, then it will be checked for you.
此外，您甚至不需要拥有ng-checked指令。如果您的模型的值是真的，那么它将为您检查。
