Angularjs如何设置选择默认值 [英] Angularjs how to set the default value for select

问题描述

我有以下对象：

defaults = {
0 : {
    id : 10,
    value : "string 1"
    },
1 : {
    id : 22,
    value : "string 2"
    }
}

我要遍历这个对象，并将其显示为一个选择框。

I want to iterate over this object and display it as a select box.

<select ng-model="selectedValue" ng-options="obj.id as obj.value for obj in defaults">
   <option value="">---Select option-----</option>
</select>

我试图做到的，是在默认情况下选择字符串'2'。但是，这是行不通的。
我的问题是事实了selectedValue是一个字符串：

What I'm trying to achieve is to select 'string 2' by default. But it does not work. The problem I have is the fact the selectedValue is a string:

$scope.selectedValue = "string 2";

这是我从文档了解到了selectedValue必须是同一个对象。但不幸的是，这是不可能的。在我的情况了selectedValue必须是一个字符串。
换句话说，我需要与选项的名称进行操作而已，我不关心ID。
我试图用NG-重复。它甚至工作，但显示一个空的选项，并用NG重复是一个很好的办法做到这一点，我不认为。

From what I learned from the documentation the selectedValue must be the same object. But unfortunately, it is not possible. In my case selectedValue must be a string. In other words I need to operate with the name of the option only, I don't care about id. I tried to use ng-repeat. It even works but displays an empty option and I don't think using ng-repeat is a good way to do it.

任何意见，将大大pciated AP $ P $。

Any advice will be appreciated greatly.

推荐答案

如果你想在了selectedValue 变量包含的价值，而不是ID，那么你不应该使用 obj.id为obj.value ，但 obj.value为obj.value 。

If you want the selectedValue variable to contain the value, and not the ID, then you should not use obj.id as obj.value, but obj.value as obj.value.

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