更改 ng 模型后 Select2 视图不会更改

Question

我正在努力创建一个使用Select2处理的元素。我为Select2下拉菜单创建了一个Angular指令。但是，如果我在指令渲染后更改NG模型，则该视图将无法更新。

以下是jsfiddle中一个简单示例的链接：http：//jsfiddle.net/odiseo/zrchy7w0/5/

<div ng-app="miniapp" ng-controller="Ctrl">
<select ng-model="selectedOption" wb-select2 ng-options="k as v for (k, v) in optionList" select-width="300px"></select>
<button ng-click="changeModelOutside()">Click me</button>

var $scope;
var app = angular.module('miniapp', []);
app.directive('wbSelect2', function () {
return {
    restrict: 'A',
    scope: {
            'selectWidth': '@',
            'ngModel': '='
    },
    link: function (scope, element, attrs) {
        //Setting default values for attribute params
        scope.selectWidth = scope.selectWidth || 200;
        element.select2({
            width: scope.selectWidth,
        });
    }
};
});

function Ctrl($scope) {
$scope.optionList = {
    'key1': 'Option 1',
        'key2': 'Option 2',
        'key3': 'Option 3',
        'key4': 'Option 4'
};
$scope.selectedOption = 'key3';
$scope.changeModelOutside = function () {
    $scope.selectedOption = 'key4';
};
}

顺便说一句，修复程序应仅进行更改 ince 指令的链接函数，任何修复外部>使用$（'option'）。select2（）。select2（'val'，'1'）将只是一个工作。

有人找到了同样的问题并为此提供解决方案？

Answer 1

您可以查看此JSFIDDLE。

http://jsfiddle.net/zrchy7w0/6/

<div ng-app="miniapp" ng-controller="Ctrl">
    <select ng-model="selectedOption" wb-select2 ng-options="k as v for (k, v) in optionList" select-width="350px" style="width:300px"></select>
    <button ng-click="changeModelOutside()">Click me</button>
</div>

---

var $scope;
var app = angular.module('miniapp', []);
app.directive('wbSelect2', function () {
    return {
        restrict: 'A',
        scope: {
            'selectWidth': '@',
            'ngModel': '='
        },
        link: function (scope, element, attrs) {
            //Setting default values for attribute params
            scope.selectWidth = scope.selectWidth || 200;
            element.select2({
                width: scope.selectWidth,
            });
            scope.$watch('ngModel', function(newValue, oldValue){
                element.select2().val(newValue);
            });
        }
    };
});

function Ctrl($scope) {
    $scope.optionList = {
        'key1': 'Option 1',
            'key2': 'Option 2',
            'key3': 'Option 3',
            'key4': 'Option 4'
    };
    $scope.selectedOption = 'key3';
    $scope.changeModelOutside = function () {
        $scope.selectedOption = 'key4';
    };
}