在jQuery Ajax函数中返回响应 [英] Returning Response in jquery ajax function

问题描述

根据checkusers()函数返回的结果，在Response.d中遇到问题，我正在保存这些值.如果输入的名称已存在于数据库中，则应显示用户已经存在"；如果输入的名称不在数据库中，则应创建一个新记录.

Getting problems in Response.d , based on the result which is returning by the checkusers() function I am saving the values. If the entered name is in already in database it should say "User already exists", if it is not in database it should create a new record.

但是我没有从(响应)获得正确的值，我观察到Console.log(response.d)给了我正确的值，例如'true'或'false'.我尝试了所有我知道的东西-

But I am not getting the correct value from (response), I observed that Console.log(response.d) giving me correct values like 'true' or 'false'. I tried everything I know like-

1. 更改异步:"false"
2. var jqXHR = $.ajax({并返回jqXHR.responseText

1. changing async:"false"
2. var jqXHR = $.ajax({ and returning jqXHR.responseText

但是他们都不为我工作.请帮助我.

But none of they worked for me . Please help me with this.

submitHandler: function (form) {

        var txtName = $("#txtName").val();
        var txtEmail = $("#txtEmail").val();
        var txtSurName = $("#txtSurName").val();
        var txtMobile = $("#txtMobile").val();
        var txtAddress = $("#txtAddress").val();

        var obj = CheckUser();
        if (obj == false) {
            $.ajax({
                type: "POST",
                url: location.pathname + "/saveData",
                data: "{Name:'" + txtName + "',SurName:'" + txtSurName + "',Email:'" + txtEmail + "',Mobile:'" + txtMobile + "',Address:'" + txtAddress + "'}",
                contentType: "application/json; charset=utf-8",
                datatype: "jsondata",
                async: "true",
                success: function (response) {

                    $(".errMsg ul").remove();
                    var myObject = eval('(' + response.d + ')');
                    if (myObject > 0) {
                        bindData();
                        $(".errMsg").append("<ul><li>Data saved successfully</li></ul>");
                    }
                    else {
                        $(".errMsg").append("<ul><li>Opppps something went wrong.</li></ul>");
                    }
                    $(".errMsg").show("slow");
                    clear();

                },
                error: function (response) {
                    alert(response.status + ' ' + response.statusText);
                }


            });
        }
        else {

            $(".errMsg").append("<ul><li>User Already Exists </li></ul>");
            $(".errMsg").show("slow");

        }

    }

});

$("#btnSave").click(function () {
    $("#form1").submit()

});
});

checkusers函数是:

checkusers function is:

function CheckUser() {

  var EmpName = $("#txtName").val();

    $.ajax({

    type: "POST",
    url: location.pathname + "/UserExist",
    data: "{Name:'" + EmpName + "'}",
    contentType: "application/json; charset=utf-8",
    datatype: "jsondata",
    async: "true",
    success: function (response) {
        console.log(response.d);

    },
    error: function (response) {
        alert(response.status + ' ' + response.statusText);


    }



});
}

推荐答案

仅因为您的数据库返回true或false并不意味着CheckUser()也将返回此值.

Just because your database returns true or false doesn't mean this also gets returned by your CheckUser().

这里有几个选项:

1. 要么在CheckUser中创建局部变量，要么使Ajax调用同步，然后在成功函数中将局部变量设置为response.d，然后返回该局部变量.

1. Either you make a local variable in your CheckUser, Make your Ajax call synchronous, set the local variable to response.d in the success function and then return that local variable.

另一种选择是使用Deferred对象，并使您的Submithandler Ajax调用等待Checkuser Ajax调用返回；

Another option is to work with Deferred objects and make your submithandler Ajax call wait for the Checkuser Ajax call to return;

第三个选择是，如果尚未创建用户，则从CheckUser Ajax调用的成功回调中调用您的create ajax调用.

A third option is to call your create ajax call from your success callback in your CheckUser Ajax call if the user isn't created yet.

我建议选择选项2或3，因为选项1不友好.

I would recommend either option 2 or 3, because option 1 is not userfriendly.

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