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Fetching data from server using XMLHttpRequest (for Phonegapp BlackBerry App)
try{
    request = new XMLHttpRequest();
    request.onreadystatechange = processResults;
    request.open('GET', url, false);
    request.send();
}catch(e){
    alert('exception performing data request: ' + e.name + '; ' + e.message);
}

function processResults(){
    if(request.readyState == 4){
        if(request.status == 200){
            document.getElementById('divResults').innerHTML = request.responseText;
        }else{
            alert("Error! Status" + request.status + " - " + request.statusText);
        }
    }
}

NS_ERROR_FAILURE; Component returned failure code: 0x80004005 (NS_ERROR_FAILURE)

try {
    netscape.security.PrivilegeManager.enablePrivilege("UniversalBrowserRead");
} catch (e) {
    alert("UniversalBrowserRead failed");
}

// Create the XHR object.
// For non-IE browsers (Chrome, Mozilla, Opera, Safari, etc.).
if(XMLHttpRequest){
    request = new XMLHttpRequest();
// For IE.
}else if(ActiveXObject){
    try{
        request = new ActiveXObject('Msxml2.XMLHTTP');
    }catch(e){
        request = new ActiveXObject('Microsoft.XMLHTTP');
    }
}else{
    alert('Could not create XMLHTTP request object');
}

// Request the data.
try{
    request.onreadystatechange = function(){
        if(request.readyState == 4 && request.status != 200){
            console.log(request.responseText);
            alert("Error! Status " + request.status + " - " + request.statusText);
        }
    };
    request.open('GET', targetURL, false);
    request.send();

}catch(e){
    alert('Error while performing the request: ' + e.name + '; ' + e.message);
}

// Empty the content into a proper JavaScript variable.
var text = request.responseText;
var xmlText = eval("(" + text + ")");
// Just fetch the data you want from the xmlText object.