Angular 2等待承诺并可以观察到解决

Question

在我的accountService中，我有一个对话框，要求用户输入返回承诺的用户名/密码。 如果他们单击关闭而不是关闭，并且验证器需要数据才能单击关闭，那么我想使用返回可观察值的数据登录。

loginModal() : boolean {

    this.dpDialogService.input(
        'Login',
        [
            {
                label: 'Username/Email', 
                form: 'username', 
                data: '', 
                validators: [Validators.required],
                validatorMsg: 'Username is required.'
            },
            {
                label: 'Password', 
                form: 'password', 
                data: '', 
                validators: [Validators.required],
                validatorMsg: 'Password is required.',
                type: 'password'
            },
        ]
    ).then(
        close => {
            this.login({username: close.username.value, password: close.password.value}).subscribe(
                loginResult => {
                    return true;
                },
                errorResult => {
                    this.dpDialogService.error('Invalid username/password.');
                    return false;
                }
            )
        },
        dismiss => {
            return false;
        }
    );
}

如何从函数返回此布尔值。 我猜我必须使用一个承诺，但不确定如何嵌套它们。

Answer 1

如果.subscribe不返回承诺，则您需要创建一个根据.subscribe结果解析为true / false的.subscribe

我假设返回的Promise必须始终解决，永不拒绝（基于dismiss =>代码

).then(
    close => {
        return new Promise((resolve, reject) => {
            this.login({username: close.username.value, password: close.password.value}).subscribe(
                loginResult => {
                    resolve(true);
                },
                errorResult => {
                    this.dpDialogService.error('Invalid username/password.');
                    resolve(false);
                }
            )
        })
    },
    dismiss => {
        return false;
    }
);

Answer 2

这是答案，谢谢您的帮助Jaromanda X

loginModal() : Promise<boolean> {

    return new Promise((resolve, reject) => {
        this.dpDialogService.input(
            'Login',
            [
                {
                    label: 'Username/Email', 
                    form: 'username', 
                    data: '', 
                    validators: [Validators.required],
                    validatorMsg: 'Username is required.'
                },
                {
                    label: 'Password', 
                    form: 'password', 
                    data: '', 
                    validators: [Validators.required],
                    validatorMsg: 'Password is required.',
                    type: 'password'
                },
            ]
        ).then(
            close => {
                this.login({username: close.username.value, password: close.password.value}).subscribe(
                    loginResult => {
                        resolve(true);
                    },
                    errorResult => {
                        this.dpDialogService.error('Invalid username/password.');
                        resolve(false);
                    }
                )
            },
            dismiss => {
                resolve(false);
            }
        );
    });