XMLHTTPREQUEST

[yynneejj]

using javascript console i've found out the following error in my script..

at line 65:undefined value...what wrong to my code



var so;
var imgid_callback1;
const DIV_ID = 'locationsample';


function setup(){
try {
so = device.getServiceObject("Service.Location", "ILocation");

}
catch (e) {
alert('<setup> ' +e);
}
}


function getLocation(imgId) {


var updateoptions = new Object();
// Setting PartialUpdates to 'FALSE' ensures that user get atleast
// BasicLocationInformation (Longitude, Lattitude, and Altitude.)
updateoptions.PartialUpdates = false;

var criteria = new Object();
criteria.LocationInformationClass = "BasicLocationInformation";
criteria.Updateoptions = updateoptions;

try {
var result = so.ILocation.GetLocation(criteria);
if(!checkError("ILocation::getLocation",result,DIV_ID,imgId)) {
document.getElementById(DIV_ID).innerHTML = showObject(result.ReturnValue);
}
}
catch (e) {

alert ("getLocation: " + e);
}
}

function getLocationAsync(imgId) {
var updateoptions = new Object();
updateoptions.PartialUpdates = false;
var criteria = new Object();
criteria.LocationInformationClass = "BasicLocationInformation";
criteria.Updateoptions = updateoptions;

imgid_callback1 = imgId;

try {
var result = so.ILocation.Trace(criteria, callback1);
if(!checkError("ILocation::getLocationAsync",result,DIV_ID,imgId)) {
showIMG(imgId,"");
}
}
catch (e) {

alert ("getLocationAsync: " + e);
}
}


function callback1( result){
var latitude = result.ReturnValue.Latitude;//<----------------------here is line 65..
var longitude = result.ReturnValue.Longitude;

var req = null;
try {
req = new XMLHttpRequest();

if (typeof req.overrideMimeType != "undefined") {
req.overrideMimeType("text/xml");
}
req.onreadystatechange = function() {
if (req.readyState == 4) {
if (req.status == 200) {
}
} else {
alert("Error");
}
}



req.open("POST","http://localhost:8080/GPS/location",true);
req.setRequestHeader("longitude",+longitude);
req.setRequestHeader("latitude",+latitude);

req.send();
} catch (ex) {
alert(ex);
}
}

[jappit]

Hi,

you've defined the asynchronous callback with the wrong parameters. It should look like this:

function callback1(transId, eventCode, result)
{
...
}

Check out this page for more details:

http://library.forum.nokia.com/index...57F26C608.html

Pit

[yynneejj]

.i update my code to this:

function callback1(transId, eventCode, result){
console.info("getLocationAsync: transId: %d eventCode: %d result.ErrorCode: %d", transId, eventCode, result.ErrorCode);

var latitude = result.ReturnValue.Latitude;
var longitude = result.ReturnValue.Longitude;
-----

still undefined value at var latitude=result.ReturnValue.Latitude

[jappit]

Before accessing the Latitude/Longitude values, you should check if there was an error (by using the result.ErrorCode property) and if the event was completed (by checking the eventCode argument).

Hope it helps,
Pit

[yynneejj]

I add this line:

var errCode=result.ErrorCode;
if(errCode){
alert("(003)GPS Error:"+errCode+""+result.ErrorMessage);
}
else{
alert(result.ReturnValue.Latitude,result.ReturnValue.Longtitude);
}

but still..the result variable found undefined..how can i know why my var result found undefined...


thanks

[yynneejj]

what is the use of transId, eventCode,..is it importandin callback function?how can use that parameters?

[jappit]

Yes, both transId and eventCode are important: you have to check them to identify your call and to be sure that the event is completed. Check out the link I've posted to get more details:

http://library.forum.nokia.com/index...57F26C608.html

Pit

[yynneejj]

now i know why my var result found undefined..because my send button direct/address to callback function directly..so in callback function the function in getting the value of the variable result in not processing/called..my problem now..where i will address/direct the onclick of the send button?