使用async＆amp; amp;同步http请求等待 - 角5

Question

我需要调用API并验证数据，然后根据API的结果我需要重新路由用户。所有这些都应该在页面渲染之前发生。

我正在以角度5工作

validateUrl() {
    this.route.params.subscribe(async params => {
        if (params['id']) {
            let rep = await this.validateRepUrl(params['id']);
            if (rep) {
                this.router.navigate(['/request', rep]);
            } else {
                this.router.navigate(['/']);
            }
        }
    });
}

validate(url) {
    let validationDone;
    const updated = new Promise<Boolean>(resolve => validationDone = resolve);
    this.startupService.validateUrl(url)
    .subscribe(result => {
        if (result && result.data > 0) {
            validationDone(result.data);
        }
    }, err => {
        validationDone(null);
    });
}