在 asp.net mvc 4 中调用 jquery ajax 后的服务器端重定向 [英] Server side redirection after jquery ajax call in asp.net mvc 4

问题描述

我正在从 jQuery AJAX 调用向 MVC 4 控制器发送登录信息:

I am sending login information from a jQuery AJAX call to an MVC 4 controller:

   $.post(url, data, function (response) {
      if (response=='InvalidLogin') {
          //show invalid login
      }
      else if (response == 'Error') {
          //show error
      }
      else {
          //redirecting to main page from here for the time being.
          window.location.replace("http://localhost:1378/Dashboard/Index");
      }
   });

如果登录成功，我想根据用户类型将用户从服务器端重定向到相应的页面.如果登录失败，则向用户发送一个字符串:

If the login is successful, I want to redirect a user from the server-side to the appropriate page on the basis of user type. If the login fails, a string is sent back to user:

    [HttpPost]
    public ActionResult Index(LoginModel loginData)
    {
        if (login fails)
        {
            return Json("InvalidLogin", JsonRequestBehavior.AllowGet);
        }
        else
        {
             // I want to redirect to another controller, view, or action depending
             // on user type.
        }
    }

但是有问题:

1. 如果此方法返回ActionResult"，则我收到错误并非所有代码路径都返回值.

如果我使用void"，则无法返回任何内容.

If I use 'void', I cannot return anything.

即使我使用没有返回的void"，由于 jQuery AJAX 调用的异步特性，我也无法重定向到其他控制器或视图.

Even if I use 'void' with no return, I am failing to redirect to other controller or view due to asynchronous nature of jQuery AJAX calls.

是否有任何技术可以处理此类情况?

Are there any techniques to handle such scenarios?

推荐答案

return 通常从方法返回而不执行任何进一步的语句，因此不需要 else 部分.这样你就可以摆脱问题#1.

return usually returns from method without executing any further statements in it so else part is not needed. This way you will get rid of a problem #1.

至于重定向为什么不返回某种redirect命令:

As for redirecting why not return some kind of redirect command:

[HttpPost]
public ActionResult Index(LoginModel loginData)
{
    if (login fails)
    {
        return Json(new {result = "InvalidLogin"}, JsonRequestBehavior.AllowGet);
    }
    return Json(new {result = "Redirect", url = Url.Action("MyAction", "MyController")});
}

然后在 javascript 中:

And then in javascript:

$.post(url, data, function (response) {
  if (response.result == 'InvalidLogin') {
      //show invalid login
  }
  else if (response.result == 'Error') {
      //show error
  }
  else if (response.result == 'Redirect'){
      //redirecting to main page from here for the time being.
      window.location = response.url;
  }
 });

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