选项在 ng-repeat 时如何初始化 select 值？

Question

起初我试过<select name='size' ng-model='sid' ng-options='y.id as y.title for y in arr'>。但是提交表单时，发布的变量 size 不是 id 472 473 474 而是索引 0 1 2.

然后我试了ng-options='y.title for y in arr track by y.id'。但是选择的型号 sid 不是 473 而是 {"id":473,"title":"bb"} 所以我不能让 ng-init='sid = 473' 默认 473 项。

最后，我不得不使用 option ng-repeat='y in arr' 如下。但似乎 ng-init 没有用，因为它会在选项重复之前进行初始化。我怎样才能让它发挥作用？

谢谢。

<div ng-controller="Ctrl">
    <select ng-model='sid' ng-init='sid = 473'>
        <option ng-repeat='y in arr' value='{{ y.id }}'>
            {{ y.id+' - '+y.title }}
        </option>
    </select>
    {{ sid }}
    <button ng-click='sid=474'>change to 474</button>
</div>
<script>
var app =angular.module('app', []);

function Ctrl($scope){
    $scope.arr = [{"id":472,"title":"aa"},{"id":473,"title":"bb"},{"id":474,"title":"cc"}];
}
</script>

http://jsfiddle.net/hcLVE/86/

Answer 1

记得阅读文档：

"Do not use select as and track by in the same expression. They are not designed to work together." https://docs.angularjs.org/api/ng/directive/ngOptions

http://jsfiddle.net/qm7f2kqj/

您只需要修复您的 ng-options：

<div ng-controller="Ctrl">
    <select ng-init="sid = 473" ng-model='sid'
      ng-options="y.id as ( y.id + ' - ' + y.title) for y in arr">
    </select>
    <input type="hidden" name="size" value="{{sid}}"/>
    {{ sid }}
    <button ng-click='sid=474'>change to 474</button>
</div>

Answer 2

使用不可见输入<input name="profile_id" type="text" style="margin-left:-10000px;" ng-model="profile"/>

我找到了解决方案，但并不理想。欢迎大家有好的想法分享。

选项在 ng-repeat 时如何初始化 select 值？

How to initialize a select value when option is in ng-repeat?

angularjs

angularjs-ng-init