Jquery ajax execution sequence returns custom error message (explanation with examples)_jquery

1. Execution order of multiple Ajax in one function

Since the async of Ajax in Jquery is true by default (asynchronous request), if you want to execute another Ajax after one Ajax is executed, you need to set async=false.

Copy code The code is as follows:

function TestAjax(){
      var UserName = $("#txtUserName").val() ;
            $.ajax(
                                                                     success: function (data) {
alert(data);
                                                                                                            🎜>           async: false,
               data: " UserName=" UserName,
success: function (data) {
                                                       (msg) {
alert (msg.responseText);
                                                                                                                                                               ;
Set StatusCode = 500,

Trigger Ajax error, display custom information after receiving data




Copy code


The code is as follows:

error: function (msg) {
                                                                                                                                                                                 ; context.Response.StatusCode = 500; context.Response.Write("Please enter username");

Copy Code The code is as follows:

string sUserName = context.Request.QueryString["UserName"];

if (!string.IsNullOrEmpty(sUserName))
                                                                                                                                                                                                                                   {
context.Response.StatusCode = 500 ;
                  context.Response.Write("Please enter user name");