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Here is a working AJAX example that I found helpful to get me started.

There is some sample code here on how to send/receiven data in JSON via AJAX.

Hopefully this helps to get you started.

Here is an example of how to send your parameters in json format (see the 4th line of code).

var postVar = "something to pass";
var postVar2 = "something else to pass";
var url = "http://<your_web_service>/format/json";  //example url ()web service will return data in json format)
var send = JSON.parse('{"var" : "'+ postVar +'","var2" : "'+ postVar2 +'"}'); //sending parameters to web service in json format)
response = sendRequest(url, "POST", "json","application/x-www-form-urlencoded; charset=UTF-8", false, send );  

Here is the AJAX function that send/receive the data.

function sendRequest(cmd, method, data, content, sync, send){

   if (send){
      //post data
      var webReq = jQuery.ajax({url: cmd,type: method,dataType : data,contentType : content, async : sync, data : send});
   }else{
      var webReq = jQuery.ajax({url: cmd,type: method,dataType : data,contentType : content, async : sync});
   }
      webReq.done(function( webText, status, jqXHR ) {
      // Process incoming data here
      response = webText;
      return;
   });   
      
   webReq.fail(function( jqXHR, status, errorThrown ) {
      response = false;
      return;
   });
   
   webReq.always(function( jqXHR, status, errorThrown ) {
   return;
   });
   
   return response;
}