Javascript范围和Ajax调用无法正常工作

时间:2015-04-04 23:38:03

标签: javascript php jquery ajax

我有一些问题。

首先,我的php文件是shoutbox.php,它用于登录用户。

session_start();

if(! isset($_SESSION["loggedIn"])) {

 include "login.html";

}

else {

    if(isset($_POST["submit"]) && $_POST["submit"] == "Log In") {

        if(! isset($_POST["username"]) || $_POST["username"] == "" || ! isset($_POST["password"]) ||  $_POST["password"] == "")  {

            $GLOBALS["logErr"] = "Please, filln all fields!";

            echo json_encode(false);
        }

        else if(isset($_POST["username"]) && $_POST["username"] != "" && isset($_POST["password"]) && $_POST["password"] != "") {

            if(isset($_POST["select"]) && $_POST["select"] != "") {

                session_start();

                $_SESSION["loggedIn"] = TRUE;
                $_SESSION["username"] =  $_POST["username"];
                $_SESSION["password"] = $_POST["password"];
                $_SESSION["type"] = $_POST["select"];
                $_SESSION["ip"] = get_ip_address(); /* Return current ip */

                $user = array(
                              "username" => $_SESSION["username"],
                              "islogged" => $_SESSION["loggedIn"],
                              "password" => $_SESSION["password"],
                              "ip" =>  $_SESSION["ip"],
                              "type" =>  $_SESSION["type"]
                              );

                echo json_encode($user); 

            }
        }
    }

    else if(isset($_POST["logout"]) && $_POST["logout"] == "Log Out") {

        session_start();

        unset($_SESSION["loggedIn"]);
        unset($_SESSION["username"]);
        unset($_SESSION["password"]);
        unset($_SESSION["type"]);
        unset($_SESSION["ip"]);

        echo json_encode(false);
    }

    if(isset($_SESSION["loggedIn"]) && $_SESSION["loggedIn"] == TRUE) {

  echo json_encode(true); /* user is logged in */



    }

  else {

        echo json_encode(false); /* user is not logged in */

  }

}

返回false或true,如果为true,则返回编码的用户数组。

这是Ajax调用,我必须调用2个响应,false或true,如果响应为true,还是用户数组..

function sb_UserIsLoggedIn() {
                              $.ajax({
                                  url: 'shoutbox.php',
                                  type: 'POST',
                                  dataType: 'json',

                                  success: function(response, user) {

                                    if(response) {

                                             function user(user) {                                             

                                      CurrUserInfo = {
                                          u_name: user["username"],
                                          u_psw: user["password"],
                                          ip: user["ip"],
                                          typelog: user["type"],
                                          logged: user["islogged"]
                                      };

                                      if(CurrUserInfo.typelog == "anonimous") {
                                          OnlineListObj.onlineList.anonimous.push(user["username"]);
                                      }
                                      else if(CurrUserInfo.typelog == "visible") {
                                          OnlineListObj.onlineList.visible.push(user["username"]);
                                      }

                                      OnlineListObj["onlineList"]["total"] = OnlineListObj.onlineList.anonimous.length + OnlineListObj.onlineList.visible.length;

                                      OnlineListObj["onlineList"]["phrase"] = lang["there_are"] + OnlineListObj.onlineList.total  + lang["online"] + OnlineListObj.onlineList.anonimous.length + lang["anonimous"] + OnlineListObj.onlineList.visible + lang["visibles"];

                                         LoggedIn = true;

                                      window.alert(LoggedIn);
                                      window.alert(OnlineListObj["onlineList"]["total"]);
                                      window.alert(OnlineListObj["onlineList"]["phrase"]);
                                      window.alert(CurrUserInfo.ip);
                                      window.alert(CurrUserInfo.typelog);
                                      window.alert(CurrUserInfo.logged);
                                      window.alert(CurrUserInfo.u_name);
                                      window.alert(CurrUserInfo.u_psw);


                                    }

                                  }

                                    else {

                                      window.location.href = "shoutbox.php";
                                    }

                                  },

                                  error: function(response) {
                                      sb_Error("Unknown error, try again");
                                      console.log(lang["ajax_error"]);
                                      console.log(response.responseText);


                                      LoggedIn = false;
                                  },
                              });
                          }

警报说这些未定义:

 window.alert(CurrUserInfo.ip);


   window.alert(CurrUserInfo.typelog);
                                      window.alert(CurrUserInfo.logged);
                                      window.alert(CurrUserInfo.u_name);
                                      window.alert(CurrUserInfo.u_psw);

这是因为对用户数组的调用失败了...但是调用正常,它返回true或false。 为什么它工作而另一个(对用户数组)不?我想ajax调用true或false和用户数组。

其他问题:

在关于sb_isUserLoggedIn()的代码中,我定义了一个var,LoggedIn ......

但是如果你在另一个函数中调用LoggedIn,则返回undefined:

 /* Checks if the user is online */

                function sb_isOn() {

                  sb_UserIsLoggedIn();

                    if(LoggedIn != false) {

                         return true;

                    } 

                    else {

                         return false;

                    }

              }  

正如我所写,此代码返回错误,LoggedIn未定义。

如何解决所有这些问题?

提前致谢。

1 个答案:

答案 0 :(得分:0)

我认为PHP在成功时会对echo json_encode()进行两次调用。一个用于回显用户数组,一个用于回显true。我认为这会导致无效的JSON。

我建议你编写PHP,这样就可以只调用一次echo json_encode()。你可以让它返回以下成功:

echo json_encode(array("success" => true, "user" => $user));

以下是失败:

echo json_encode(array("success" => false, "message" => 'Please, fill in all fields!'));

然后在Javacript中,您可以拥有以下内容:

success: function(result) {
    if (result.success) {
        var user = result.user;
        // Do something with user here.
    } else {
        var message = result.message;
        // Do something with message here.
    }
}