WRT Preview alerting Error:0 for XMLHttpRequest req.send(null)

**neokrezz** · 2010-11-04, 19:13

Hello,
Im a new in mobile development. Im using Visual Studio 2008 plugin and preview tool by default.
I try to call XML file using ajax XMLHttpRequest(), everything is OK in Firefox and IE8. But in Preview tool throws alert with 'Error:0' I spend hours to debug it.
the code in .js file:

Code:

function init() 
{
    var url = "xmlNames.xml";
    ajaxFetch(url, "", XML_parsing_sequence, 1, 0);
    // retrieves data from server via ajax
    function ajaxFetch(url, param, callback, isXML, isPost) {
        var req = new XMLHttpRequest();
        req.onreadystatechange = function() {
            if (req.readyState == 4 && req.status == 200) {
                if (isXML && req.responseXML != null) {
                    callback(req.responseXML);
                }
                else {
                    callback(null);
                }
            } else if (req.readyState == 4 && req.status != 200) {
                // fetched the wrong page or network error...
                var err = "Error: " + req.status;
                alert(err);
                callback(err);
            }
        }

        if (!isPost) 
        {
            req.open("GET", url, true);
            req.send(null);
        }
        else
        {
            // POST, doesn't work in the emulator!
            req.open("POST", url, true);
            req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
            //req.send("data="+encodeURIComponent(param));
        }
    }
        
    function XML_parsing_sequence(xmlFile) 
    {
        $(xmlFile).find("food").each(
        function() {
            alert('asd');
            $("#output").append($(this).find("name").text());

            //Use the line below, if you have added an attribute to the XML file, e.g. <food id="1">
            //$("#output").append($(this).attr("id")+"<br />");

            //Add just one extra line in between each tag to form a list   
            $("#output").append("<br>");
        });
    }
}

.html file:

HTML Code:

 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>Sample Widget</title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <link href="basic.css" rel="stylesheet" type="text/css" />

    <script type="text/javascript" src="jquery-1.4.2.min.js"></script>

    <script type="text/javascript" src="basic.js"></script>

    <meta name="generator" content="Nokia WRT extension for Visual Studio 2.0" />
</head>
<body onload="init()">
    <div id="output" align="center">
    </div>
</body>
</html>

Info.plist

Code:

 <?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Nokia//DTD PLIST 1.0//EN" "http://www.nokia.com/DTDs/plist-1.0.dtd">
<plist version="1.0">
  <dict>
    <key>DisplayName</key>
    <string>ovitop5</string>
    <key>Identifier</key>
    <string>com.ovitop5.basic.widget</string>
    <key>MainHTML</key>
    <string>index.html</string>
    <key>AllowNetworkAccess</key>
    <true/>
    <key>Version</key>
    <string>1.0</string>
    <key>MiniViewEnabled</key>
    <true/>
  </dict>
</plist>

.xml

HTML Code:

<?xml version="1.0" encoding="utf-8" ?>
<breakfast_menu>
  <food>
    <name>Belgian Waffles</name>
    <price>$5.95</price>
    <description>
      two of our famous Belgian Waffles with plenty of real maple syrup
    </description>
    <calories>650</calories>
  </food>
  <food>
    <name>Strawberry Belgian Waffles</name>
    <price>$7.95</price>
    <description>
      light Belgian waffles covered with strawberries and whipped cream
    </description>
    <calories>900</calories>
  </food>
  <food>
    <name>Berry-Berry Belgian Waffles</name>
    <price>$8.95</price>
    <description>
      light Belgian waffles covered with an assortment of fresh berries and whipped cream
    </description>
    <calories>900</calories>
  </food>
  <food>
    <name>French Toast</name>
    <price>$4.50</price>
    <description>
      thick slices made from our homemade sourdough bread
    </description>
    <calories>600</calories>
  </food>
  <food>
    <name>Homestyle Breakfast</name>
    <price>$6.95</price>
    <description>
      two eggs, bacon or sausage, toast, and our ever-popular hash browns
    </description>
    <calories>950</calories>
  </food>
</breakfast_menu>

attached screenshot

**wenz** · 2010-11-08, 22:38

add a line of code

Code:

netscape.security.PrivilegeManager.enablePrivilege('UniversalBrowserRead');

before your httpxmlrequest should solve your problem

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