重定向 Ajax Jquery 调用 [英] Redirect on Ajax Jquery Call

问题描述

我是 ajax 的新手，我知道有人已经遇到过这个问题.我有一个建立在 Spring MVC 上的遗留应用程序，它有一个拦截器(过滤器)，可以将用户重定向到登录没有会话时的页面.

I am newbie to ajax here and I know somebody would have encountered this problem already. I have a legacy app built on Spring MVC, it has a interceptor(filter) that redirects the user to the login page whenever there is no session.

public class SessionCheckerInterceptor extends HandlerInterceptorAdapter {
 public boolean preHandle(HttpServletRequest request,
   HttpServletResponse response, Object handler) throws Exception {
  HttpSession session = request.getSession();

  // check if userInfo exist in session
  User user = (User) session.getAttribute("user");
  if (user == null) {
   response.sendRedirect("login.htm");
   return false;
  }
  return true;
 }
}

对于非 xmlhttp 请求，这工作正常..但是当我尝试在我的应用程序中使用 ajax 时，一切都变得奇怪，它无法正确重定向到登录页面.如检查

For non-xmlhttp request, this works fine.. but when I try to use ajax in my application, everything gets weird, it is not able to redirect to the login page correctly. As check the value of the

xhr.status = 200 textStatus = parseError errorThrown = "无效的 JSON - 我的 HTML 登录页面的标记-

xhr.status = 200 textStatus = parseError errorThrown = "Invalid JSON -Markup of my HTML Login Page-

$(document).ready(function(){
        jQuery.ajax({
            type: "GET",
            url: "populateData.htm",
            dataType:"json",
            data:"userId=SampleUser",
            success:function(response){
             //code here
            },
         error: function(xhr, textStatus, errorThrown) {
                alert('Error!  Status = ' + xhr.status);
             }

        });
});

我检查了我的萤火虫有一个 302 HTTP 响应，但我不知道如何捕捉响应并将用户重定向到登录页.这里有什么想法吗?谢谢.

I checked on my firebug that there is a 302 HTTP response but I am not sure how to catch the response and redirect the user to the login page. Any idea here? Thanks.

推荐答案

JQuery 正在寻找 json 类型的结果，但是因为重定向是自动处理的，它会收到生成的 htmllogin.htm 页面的源.

JQuery is looking for a json type result, but because the redirect is processed automatically, it will receive the generated html source of your login.htm page.

一个想法是让浏览器知道它应该通过向结果对象添加一个 redirect 变量并在 JQuery 中检查它来重定向:

One idea is to let the the browser know that it should redirect by adding a redirect variable to to the resulting object and checking for it in JQuery:

$(document).ready(function(){ 
    jQuery.ajax({ 
        type: "GET", 
        url: "populateData.htm", 
        dataType:"json", 
        data:"userId=SampleUser", 
        success:function(response){ 
            if (response.redirect) {
                window.location.href = response.redirect;
            }
            else {
                // Process the expected results...
            }
        }, 
     error: function(xhr, textStatus, errorThrown) { 
            alert('Error!  Status = ' + xhr.status); 
         } 

    }); 
}); 

您还可以在响应中添加标头变量，让浏览器决定重定向的位置.在 Java 中，不要重定向，而是执行 response.setHeader("REQUIRES_AUTH", "1")，而在 JQuery 中，你就成功了(！):

You could also add a Header Variable to your response and let your browser decide where to redirect. In Java, instead of redirecting, do response.setHeader("REQUIRES_AUTH", "1") and in JQuery you do on success(!):

//....
        success:function(response){ 
            if (response.getResponseHeader('REQUIRES_AUTH') === '1'){ 
                window.location.href = 'login.htm'; 
            }
            else {
                // Process the expected results...
            }
        }
//....

希望有所帮助.

我的回答深受this的启发线程不应该留下任何问题，以防您仍然有一些问题.

My answer is heavily inspired by this thread which shouldn't left any questions in case you still have some problems.

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