Jquery Ajax Execution Order return custom error message (instance explanation) _jquery

Source: Internet
Author: User

1. The order in which multiple Ajax is executed in a function

Because Ajax in jquery is async by default (asynchronous request), if you want to perform another Ajax after an Ajax execution, you need to async=false.

Copy Code code as follows:

function Testajax () {
var UserName = $ ("#txtUserName"). Val ();
$.ajax (
{
URL: "Ajaxcheckusername.htm",
Async:false,
Success:function (data) {
alert (data);
}
});
Alert (' Test ');
$.ajax ({
URL: "Ajaxhandler.ashx",
Async:false,
Data: "Username=" + UserName,
Success:function (data) {
$ ("#divAjax"). HTML (data);
},
Error:function (msg) {
alert (Msg.responsetext);
}
});
}

2. Return custom error

Set StatusCode = 500,

Error triggering Ajax, displaying custom information when receiving data

Copy Code code as follows:

Error:function (msg) {
alert (Msg.responsetext);
}

Context. Response.statuscode = 500;
Context. Response.Write ("Please enter user name");


Copy Code code as follows:

String sUserName = context. request.querystring["UserName"];
if (!string. IsNullOrEmpty (sUserName))
{
Context. Response.Write (String. Format ("Hello {0}!", susername));
}
Else
{
Context. Response.statuscode = 500;
Context. Response.Write ("Please enter user name");
}

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