How to implement asynchronous service call in javascript?

Question

I want to call my server asynchronously.

My code is as below:-

function GetSynchronousJSONResponse(url, postData) {
var xmlhttp = null;
if (window.XMLHttpRequest)
xmlhttp = new XMLHttpRequest();
else if (window.ActiveXObject) {
if (new ActiveXObject("Microsoft.XMLHTTP"))
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
else
xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
}
xmlhttp.open("POST", url, false);
xmlhttp.send(postData);
var responseText = xmlhttp.responseText;
return responseText;
}

But service call gives "Bad Request" error. Please help

Why not use jQuery? It will save you a lot of trouble in the future.. — Transcendental
– Transcendental, Commented Oct 29, 2015 at 9:26

Baqir · Accepted Answer · 2015-10-29 09:36:49Z

1

You forgot to add content type in your request. please add below line and try again xmlhttp.setRequestHeader("Content-Type","application/json;charset=utf-8");

answered Oct 29, 2015 at 9:36

Baqir

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Comments

sourav jena · Accepted Answer · 2015-10-29 09:32:56Z

0

function GetSynchronousJSONResponse(URL,postData) {

        $.ajax({

           url : URL,

           type : "POST",

           data : JSON.stringify(postData),//if required

           contentType : 'application/json',

           success : function(data) {}
   })
}

you can Try this .....................

answered Oct 29, 2015 at 9:32

sourav jena

1

2 Comments

Bergi Over a year ago

Don't call this function GetSynchronous…!

Bergi Over a year ago

Yes, in the first line of your answer.

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