Sending request is the asynchronous operation ,here is the code of sending on the widget:
function getRequest() {
http_request = false;
if(window.XMLHttpRequest)
{
http_request = new XMLHttpRequest();//create a new XMLHttpRequest()
if (http_request.overrideMimeType)
{//set MIME type
http_request.overrideMimeType("text/xml");
DEBUG("dDisp", "sendRequest","http_request is XMLHttpRequest!");
}
}
else if(window.ActiveXObject)
{
try
{
http_request = new ActiveXObject("MSXml2.XMLHTTP");
DEBUG("dDisp", "sendRequest","http_request is MSXml2.XMLHTTP!");
}
catch(e)
{
try
{
http_request = new ActiveXObject("Microsoft.XMLHTTP");
DEBUG("dDisp", "sendRequest","http_request is Microsoft.XMLHTTP!");
}
catch(e)
{
DEBUG("dDisp", "sendRequest","http_request is not match!");}
}
}
if(!http_request)
{
DEBUG("dDisp","sendRequest","Can't create XMLHttpRequest object "+http_request);
return false;
}
return http_request;
}
/**
* send the request
*/
function getResponseText(){
DEBUG("dDisp","sendRequest","Start to open XMLHttpRequest ");
var vurl = document.getElementById("serverUrl").value;
DEBUG("dDisp", "GetResponseText","Input URL is: " + vurl);
DEBUG("dDisp","sendRequest","Start to open XMLHttpRequest ");
try {
http_request = new XMLHttpRequest();
http_request.open("post",vurl,true);
http_request.onreadystatechange = function(){//callback function
if (http_request.readyState==4){
DEBUG("dDisp", "ResponseData", http_request.status+"-"+http_request.readyState);
DEBUG("dDisp", "getResponseHeader", http_request.getResponseHeader("Content-Type"));
DEBUG("dDisp", "getResponseText", http_request.responseText);
}
}
http_request.setRequestHeader("Content-Type", "text/xml")
http_request.setRequestHeader("charset", "GBK");
http_request.setRequestHeader("Widget-IMEI", "102");
http_request.setRequestHeader("Widget-Timeout", "20");
http_request.setRequestHeader("Widget-Action","Report");
//reportXml content
var reportXml = "<WidgetScriptResultResp>";
reportXml += i;
reportXml += "</WidgetScriptResultResp>";
DEBUG("dDisp", "Loop:", i);
http_request.send(reportXml);
}
catch (e) {
DEBUG("dDisp","sendRequest","Failed to open XMLHttpRequest ");
break;
}
}
DEBUG("dDisp","sendRequest","Finished!");
}
onreadystatechange() is the callback function of XMLHttpRequest,you can hanld the response of web service. readyState :0--before the open();1--before the send();2--request have been sent.3--request are handling with.4--request have been done.
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