angularjs – 在异步验证器承诺待处理时考虑一个表单无效

app.directive('validateBar',['$http',function($http) {
    function link($scope,$element,$attrs,ngModel) {
        ngModel.$asyncValidators.myValidator = function(value) {
            return $http.get('/endpoint/' + value);
        };
    }
    return {
        require: 'ngModel',link: link
    };
}]);

表单模板：

<form name="myForm" ng-submit="foo.$valid && saveForm()">
    <input name="bar" ng-model="bar" data-validate-bar>
    <p ng-show="myForm.bar.$error.myValidator">Your bar is wrong</p>
    <button disabled="myForm.$invalid">
</form>

问题：在myValidator承诺待处理的时候,我希望我的伴随形式无效.

当异步验证器处于待处理状态时,我知道有两种使表单无效的方法,但它们是冗长的和/或恶意的.

// Workaround 1: Mark another validator as invalid while the validator promise is pending.
// I cannot mark 'myValidator' as invalid,gets set to valid immediately by Angular.
app.directive('validateSomething',ngModel) {
        ngModel.$setValidity('async',false);
        ngModel.$asyncValidators.myValidator = function(value) {
            return $http.get('/endpoint/' + value).then(function() {
                 ngModel.$setValidity('async',true);
            });
        };
    }
    return {
        require: 'ngModel',link: link
    };
}]);

<!-- Workaround 2: Prevent submitting through the UI -->
<form name="myForm" ng-submit="myForm.$valid && !myForm.$pending && saveForm()">
    <input name="bar" ng-model="bar" data-validate-bar>
    <p ng-show="myForm.bar.$error.myValidator">Your bar is wrong</p>
    <button disabled="myForm.$invalid || myForm.$pending">
</form>

我不喜欢解决方法1,因为我将另一个验证器(async)标记为无效,这可能会产生意想不到的副作用,我不喜欢解决方法2,因为我不能再信任form.

有谁知道一个干净的解决方案？