一、用法

ngOption针对不同类型的数据源有不同的用法，主要体现在数组和对象上。

数组：

label for value in array 

select as label for value in array

label group by group for value in array

select as label group by group for value in array

select as label group by group for value in array track by trackexpr

对象：

label for ( key , value ) in object

select as label for ( key , value ) in object

label group by group for ( key , value ) in object

select as label group by group for ( key , value ) in object

说明：

array / object： 数据源的类型，有数组和对象两种

value：迭代过程中，引用数组的项或者对象的属性值

key：迭代过程中，引用对象的属性名

label：选项显示的标签，用户可看到的

select：结果绑定到ngModel中，如果没有指定，则默认绑定value

group：group by的条件，表示按某条件进行分组

trackexpr：用于唯一确定数组中的迭代项的表达式

二、实例

通用的js代码：

<script>
    var MyModule = angular.module("MyModule",[]);
    MyModule.controller("Ctrl",["$scope", function($scope){
        $scope.colors = [
            {name:‘black‘, shade:‘dark‘},
            {name:‘white‘, shade:‘light‘},
            {name:‘red‘, shade:‘dark‘},
            {name:‘blue‘, shade:‘dark‘},
            {name:‘yellow‘, shade:‘light‘}
        ];
        $scope.object = {
            dark: "black",
            light: "red",
            lai: "red"
        };
    }]);
</script>

label for value in array

html:

<select ng-model="myColor" ng-options="color.name for color in colors"></select>

效果：

select as label for value in array

html：

<select ng-model="myColor" ng-options="color.shade as color.name for color in colors"></select>

效果：

html：

<select ng-model="myColor" ng-options="color.name group by color.shade for color in colors"></select>

效果：

select as label group by group for value in array

html：

<select ng-model="myColor" ng-options="color.name as color.name group by color.shade for color in colors">

效果：

select as label group by group for value in array track by trackexpr

html：

<select ng-model="myColor" ng-options="color.name for color in colors track by color.name">

效果：

label for ( key , value ) in object

html：

<select ng-model="obj" ng-options="key for (key, value) in object"></select>

效果：

select as label for ( key , value ) in object

html：

<select ng-model="obj" ng-options="key as key for (key, value) in object"></select>

效果：

label group by group for ( key , value ) in object

html：

<select ng-model="obj" ng-options="key group by value for (key, value) in object"></select>

效果：

select as label group by group for ( key , value ) in object

html：

<select ng-model="obj" ng-options="key as key group by value for (key, value) in object"></select>

效果：

原文地址：https://www.cnblogs.com/Bruce_H21/p/12636237.html