Question

我有两个不同的循环，分别执行POST和DELETE操作。一旦完成所有操作，我想提出另一个服务请求。

我的问题是：如果删除操作出错，控件将进入catch块并需要一个对话框确认来确定是否仍需要删除该项目。

如果来自对话框的确认，我想永久删除id并且正在发生。但不知怎的，刷新比我想要的更早。我想念一些基本的东西。

function submitAndRefresh(){
    var deletePromisesTasks = [];
    var addPromisesTasks = [];

    angular.forEach(toBeDeleted, function(value,key){
        deletePromisesTasks.push(delete(value.id));
    });

    angular.forEach(toBeAdded, function(value,key){
        addPromisesTasks.push(add(value));
    });

    //To be performed after all the add/delete operations are completely done!  
    $q.all(deletePromisesTasks,addPromisesTasks).then(function(){
        refreshData(); //Another Service Call
    });
}

function delete(id, purge_flag) {
        var defer = $q.defer();
        deleteOrPurge(id, purge_flag).then((promise1) => {
            defer.resolve();
        }).catch(function(error) {
                confirmAndDeleteContractParameters(error, delete, id, true);
        }).finally(function(){
            return defer.promise;
        });
    }

function deleteOrPurge(id, purge_flag){
    return Service.items().delete({
       id: id,
       purge_flag: purge_flag || false
       }).$promise;
}



function confirmAndDelete(error, callback, parameterId, purge_flag) {
        var confirmModal = {
            header: 'Confirm',
            showCancelButton: true
        };
        try {
            confirmModal.body = 'Some msg. Do you want to continue?';
        } catch (e) {}
        ModalService.confirmDialog($scope, confirmModal, function(confirm){
            if (confirm) {
                callback(parameterId, purge_flag);
            }
        });
    }

Answer 1

作为一项基本规则，当您使用var defer = $q.defer();启动函数时，函数的最后一行通常应为return defer.promise

异步解析Promise

1 个答案: