javascript – 在发送ajax请求之前显示确认消息

我写了一个ajax函数,我想在提交表单之前显示确认符号.我应该如何添加我的条件.以下是我的代码.

$.ajax({
                        url: "UBRDashboard.aspx/GetDllValue",dataType: "json",type: "POST",contentType: 'application/json; charset=utf-8',data: JSON.stringify({ ddlOduModel: ddlOduModel,ddlAntModel: ddlAntModel,ddlOMTModel: ddlOMTModel,ddlSapID: ddlSapID,ddlvendorName: ddlvendorName,strReqID: r.d,ddlSapDescVal: ddlSapDescVal,SITE_ADD: SITE_ADD,LATITUDE: LATITUDE,LONGITUDE: LONGITUDE,ddlEQP_SEQ: ddlEQP_SEQ,txtLinkID: txtLinkID,RJ_QUANTITY: RJ_QUANTITY,USER_NAME: USER_NAME,CREATED_DATE: CREATED_DATE,LOCATIONTYPE: LOCATIONTYPE,TOWERTYPE: TOWERTYPE }),async: true,processData: false,cache: false,success: function (r) {
                            if (r.d == "OK") {
                                alert('Record Saved successfully');
                                window.location.href = "UBRDashboard.aspx";
                            }
                        },error: function (xhr) {
                            alert('Error while selecting list..!!');
                            window.location.href = "ErrorPage.aspx";
                        }
                    })
                },error: function (xhr) {
                    alert('Error while selecting list..!!');
                    window.location.href = "ErrorPage.aspx";
                }

解决方法

解决方案是使用beforeSend ajax属性.

beforeSend is a pre-request callback function before it is
sent.Returning false in the beforeSend function will cancel the
request.

beforeSend:function(){
     return confirm("Are you sure?");
},

AJAX

$.ajax({
      url: "UBRDashboard.aspx/GetDllValue",beforeSend:function(){
         return confirm("Are you sure?");
      },success: function (r) {
        if (r.d == "OK") {
        alert('Record Saved successfully');
        window.location.href = "UBRDashboard.aspx";
      },error: function (xhr) {
             alert('Error while selecting list..!!');
             window.location.href = "ErrorPage.aspx";
      }
});