angular.js - 焦虑！angular的ng-options的问题

Question

我现在需要绑定后台获取的数据到select上

后台返回的JSON：

js部分：

<select ng-model="originOptions.nation_id" ng-options="x.nation_id as x.name for x in nation">
    <option value="">请选择</option>
</select>
    

然后，读取用户的选择数据，把用户的数据显示到select上，选中状态

但是怎么都绑定不了，一看控制台：

value上全部出现了number:1这样的格式，OK！那我加上track by x.nation_id

number是没有了，但是数据又绑定不了了！

比如：用户选择的是苗族，那么nation_id是6，按道理

$scope.originOptions = {'nation_id':6}

可以绑定上啊！但是就是不行！是我哪里出错了吗

请问大家怎么回事啊！！

我刚又实验了下：加了track by就绑定不上，去掉就可以！
但是又不要value里的字符类型，怎么破~~

Answer 1

ng-model="originOptions"

Answer 2

No problem~ That’s it. What you get in the controller is the id value$scope.originOptions.nation_id

Answer 3

You can read this article

Answer 4

controller:

$scope.data = {
    model: null,
    nation: [
      {nation_id: '1', name: 'A'},
      .......
      .......
    ]
   };

HTML:

<select name="mySelect" id="mySelect"
      ng-options="x.nation_id as x.name for x in data.nation"
      ng-model="data.model"></select>

Try this data structure

Answer 5

The character type in value cannot be obtained through the bound ng-model.

Although it shows number:1

ngOptions is generated like this

You can take a look at the documentation for examples:
https://docs.angularjs.org/ap...