AngularJS 选择不绑定(bind)到 Ng 模型

Question

我的 Angular 选择没有约束力。我可以告诉值是正确的，但选择没有更新。如果值存在，为什么不具有约束力？

<div ng-controller="MyController" ng-app>
    <select class="form-control" ng-model="colorId"ng-options="color.id as color.name for color in colorList">
        <option value="">--Select a Color--</option>
    </select>
<input type="button" value="submit" ng-click="Select()"></input>

function MyController($scope) {
    $scope.colorList = [{
        id: '1',
        name: 'red'
    }, {
        id: '2',
        name: 'blue'
    }, {
        id: '3',
        name: 'green'
    }];

    var colorId = 3;
    $scope.colorId = colorId;
    alert($scope.colorId);

    $scope.Select = function () {
        var colorId = 2;
        $scope.colorId = colorId;
    }
}

这是一个 fiddle :

http://jsfiddle.net/ky5F4/23/

Answer 1

执行 Select 时需要将 id 更改为字符串

$scope.Select = function () {
    console.log('select fired');
    var colorId = 1;
    $scope.mySelection.colorId = colorId + "";
}

http://jsfiddle.net/bxkwfo0s/2/

接下来您应该使用对象的属性而不仅仅是范围变量，这将确保正确的模型绑定(bind)

ng-model="mySelection.colorId"

对象可能很简单

$scope.mySelection = {colorId : colorId };