Angular 在指令模板中使用带有表达式的 ng-model

Question

我想在自定义元素中使用 ng-model 属性。问题是，我需要使用表达式设置 ng-model：

ng-model="{{anyVariable}}"

问题是，当我将表达式添加到模板中的 ng-model 属性时，我总是会收到错误：

Error: Syntax Error: Token 'x.name' is unexpected, expecting [:] at column 3 of the expression [{{x.name}}] starting at [x.name}}].
    at Error (<anonymous>)
    at throwError (http://localhost:9000/public/javascripts/angular.js:5999:11)
    at consume (http://localhost:9000/public/javascripts/angular.js:6037:7)
    at object (http://localhost:9000/public/javascripts/angular.js:6327:9)
    at primary (http://localhost:9000/public/javascripts/angular.js:6211:17)
    at unary (http://localhost:9000/public/javascripts/angular.js:6198:14)
    at multiplicative (http://localhost:9000/public/javascripts/angular.js:6181:16)
    at additive (http://localhost:9000/public/javascripts/angular.js:6172:16)
    at relational (http://localhost:9000/public/javascripts/angular.js:6163:16)
    at equality (http://localhost:9000/public/javascripts/angular.js:6154:16) 

使用的代码：

function addFormFieldDirective(elementName, template) {
    app.directive(elementName, function() {
        return {
            restrict: "E",
            scope: {},
            replace: true,
                              // adds some extra layout
            template: buildFormTemplate(template),
            link: function(scope, elm, attrs) {
                scope.x = attrs;
            }
         };
    });
}
addFormFieldDirective("textfield", '<input id="{{x.id}}" ng-model="{{x.name}}" type="text" name="{{x.name}}" value="{{x.value}}" />');

Answer 1

试试这个版本：

.directive('myDir', function() {
    return {
        restrict: 'EA',
        scope:    {
                    YYY: '=ngModel'
                  },
        require:  'ngModel',
        replace:  true,
        template: '<input ng-model="YYY" />'
    };
});

Answer 2

我找不到在指令模板中将表达式传递给 ng-model 的方法。

以下解决方案在指令中创建隔离模型，指令controller 在主控制器模型对象中动态创建属性名称并监视隔离模型以将更新传递给主模型：

app.directive("textfield", function() {
    return {
        restrict: "E",
        scope: {},
        replace: true,
        controller:function($scope,$attrs)  {
            $scope.x=$attrs;

            $scope.$watch('directiveModel',function(){
                $scope.$parent.myModel[$attrs.name]=$scope.directiveModel;
            }) ;

            $scope.directiveModel=$attrs.value;
        },
        template: buildFormTemplate('<input ng-model="directiveModel" id="{{x.id}}" type="text" name="{{x.name}}" value="{{x.value}}" />');

    };
});

Plunkr Demo