Question

所以问题如下。我用Sweet Alert制作了AlertService。我需要确认用户是否确定要删除然后执行它。我有回调上下文切换的麻烦尽管我使用箭头功能，并尝试bind（）。这是代码：

AlertService

/**
 * This is a generic confirmation alert. 
 * @param object the object with properties to be displayed.
 * @return {boolean} if confirmed, true, else null.
 * 
 * For e.g. To generate an warning for example pass 'warning' in type attribute.
 */
confirmAlert(object: any, callback: Function): any {
    swal({
        title: object.title,
        text: object.text,
        type: object.type,
        showCancelButton: true,
        confirmButtonColor: '#3085d6',
        cancelButtonColor: '#d33',
        confirmButtonText: 'OK'
    }).then(function (res) {
        swal({
            title: object.confirmTitle,
            text: object.confirmText,
            type: 'success'
        });
        return callback(true);
    }, function (cancel) {
        swal({
            title: 'Cancelled',
            text: 'Action cancelled',
            type: 'error'
        })
        return callback(null);
    });
}

UsersComponent

/**
 * Deletes the selected user. Displays an alert to confirm.
 * Refreshes the current  users array that is displayed in a table..
 */
deleteUser() {
    let usersToDelete = {
        'users': this.users
    };
    this.alertService.confirmAlert(this.createMessages.alert.delete, (confirm) => {
        if (confirm) {
            this.webService.delete(environment.routes.users.userUrl, usersToDelete).subscribe(res => {
                if (res.status == 200) {
                    this.alertService.okAlert(this.createMessages.alert.deleteSuccess);
                }
            });
        }
    });
    this.refreshUsers();
}

问题是包含所选用户的对象永远不会到达webService。我安慰了所有的东西，然后遇到了我不知道如何解决的问题。

Answer 1

问题是我在回调之外有了refreshUsers（）而我没有意识到它正在删除我的 this.users ：

/**
 * Deletes the selected user. Displays an alert and refreshes the current array.
 */
deleteUser() {
    let usersToDelete = {
        'users': this.users
    };
    this.alertService.confirmAlert(this.allMessages.alert.delete, (res) => {
        if (res) {
            this.webService.delete(environment.routes.users.userUrl, usersToDelete).subscribe(res => {
                if (res.status == 200) {
                    this.refreshUsers();
                }
            });
        }
    });
}


/**
 * This method is used to refresh the current displayed users table.
 * Select a user and it's index. 
 * Delete it from this.all array.
 * Delete it from this.users array.
 * Call this.getAllUsers() to refresh the array.
 */
refreshUsers() {
    while (this.users.length > 0) {
        this.all.forEach(element => {
            let i = this.users.indexOf(element._id);
            if (i != -1 && this.users.length >= 0) {
                let e = this.all.indexOf(element);
                this.all.splice(e, 1);
                this.users.splice(i, 1);
                this.getAllUsers();
            }
        });
    }
}

Sweet Alert确认然后在Angular 2

1 个答案: