Facebook FB.login连接对话框，关闭事件

Question

我使用angular5-social-login进行身份验证。 我创建了一个按钮，该按钮可打开Facebook登录对话框，并且在单击打开的窗口的“ x”关闭对话框时需要捕获一个事件。 我通过捕获错误响应进行了尝试，但是没有成功。 如何访问取消事件？

这是我的职责。

public openModal(): void {
 if (!this.modalIsOpen) {
  const socialPlatformProvider = FacebookLoginProvider.PROVIDER_ID;

  this.modalIsOpen = true;
  this.socialAuthService.signIn(socialPlatformProvider).then(
    (userData) => {
      const token: string = userData.token;        
      const userName: string = userData.name;

      this.fbService.fbAdAccounts(userId, token).subscribe(res => {
          const requestBody: any= {
            fb_access_token: token,
            name: userName
          };

          this.fbService.getFbLongAccessToken(<any>{
            grant_type: 'fb_exchange_token',
            client_id: FbOauthConstants.FB_LOGIN_PROVIDED_ID,
            client_secret: FbOauthConstants.FB_LOGIN_PROVIDED_SECRET_ID,
            fb_exchange_token: token
          }).subscribe(tokenResult => {
            this.checkBoxes = res.data;
            this.dialogService.addDialog(AdAccountConfirmationComponent, {
              checkBoxes: this.checkBoxes,
              requestBody: requestBody,
              fb_unlimited_access_token: tokenResult.access_token
            }).subscribe((selectedData: any) => {
              this.modalIsOpen = false;
              if (selectedData) {
                const requestData: any[] = [];
                selectedData.forEach((item) => {
                  const currentAccount: any= <any>{};
                  currentAccount.fb_access_token = tokenResult.access_token;
                  currentAccount.fb_user_name = item.name;
                  currentAccount.name = requestBody.name;
                });
              }
            });
          });
        });
    })
    .catch((err) => console.log(err));
}
}