转： angularjs select 赋值 ng-options配置方式

摘自： http://blog.csdn.net/chwshuang/article/details/53861249

数组方式

数据是数组

 $scope.years = [2014, 2015, 2016];

页面元素

 <select ng-model="item" ng-options="item as y for y in years">
 </select>

设置默认值

如果需要设置默认的选项，可以先设置一个参数：

$scope.item = 2016;
$scope.years = [2014, 2015, 2016];

对象数组方式

---

数据是对象数组

$scope.sites = [
    {site : "baidu", url : "https://www.baidu.com"},
    {site : "163", url : "http://www.163.com"},
    {site : "sina", url : "http://www.sina.com"}
];

页面元素

<select ng-model="s.site" ng-options="s.site as s.site group by site.group for s in sites">
 </select>

设置默认值 
如果需要设置默认的选项，可以先设置一个参数：

$scope.site = "163";
$scope.sites = [
    {site : "baidu", url : "https://www.baidu.com"},
    {site : "163", url : "http://www.163.com"},
    {site : "sina", url : "http://www.sina.com"}
];

Key-Vules对象数组方式

---

数据是对象数组

$scope.cars = {
car1 : {brand : "BYD", model : "Y50", color : "red"},
car2 : {brand : "CC", model : "HF", color : "white"},
car3 : {brand : "JL", model : "JL10D", color : "black"}
};

页面元素

<select ng-model="myCar" ng-options="y.brand for (x, y) in cars">
</select>

设置默认值 
如果需要设置默认的选项，可以先设置一个参数：

$scope.site = "BYD";
$scope.cars = {
car1 : {brand : "BYD", model : "Y50", color : "red"},
car2 : {brand : "CC", model : "HF", color : "white"},
car3 : {brand : "JL", model : "JL10D", color : "black"}
};

angularjs ng-options官方API

数组类型:

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 track by trackexpr

对象类型:

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 ob