Wednesday, June 27, 2007

HTTP referer

Traceurl users have been asking for more details on the clicked links. Well, this is not an easy task. All we do is evaluating the HTTP header. So there is only limited data about the visitor and her/his computer.

Actually there would be ways to get more information about the visitors computer. For instance by injection some JavaScript code. But I fear fiddling around with the redirected page, injecting code and things the like is neither modest nor legal and could pretty quick become a copyright or privacy issue.

None the less there are still unevaluated information in the HTTP header. One of them information is the HTTP referer. The so-called HTTP referer represents the adress of the website the visitor came from. Depending on the User Agent the referrer can be hidden and in case of a direct access the referrer information is also be missing. If available the referrer will now be shown in a new column in the table on the My URLs tab. In case a traceable URL has been published on multiple websites this is a very useful information.

Of course we try to improve the Traceurl service and will think of other ways to provide additional and useful data in the future.

Monday, June 25, 2007


The website is listed on the dashboard. And the Traceurl Google Gadget made it into the directory. Feel free to have a look at the respective article and vote for I shall be delighted.

Thursday, June 14, 2007

Traceurl Google Gadget Update

A new Traceurl Google Gadget is online. By now the Gadget shows some more information and one can open a dialog displaying all access origins on a wold map (Google Map) from within the Gadget.


Click here to add the Traceurl Google Gadget to your iGoogle page.

Wednesday, June 13, 2007

Continuous zoom

In the previous post I have been talking about this continuous zoom function of the Google Map API. I did not find a lot of information about animated/continuous zoom, thus I decided to share the code I wrote.

First of all, this seems to look best in IE. In IE the animation looks very smooth, other i browser tend to flicker while zooming in. Anyways this is a quite new feature and I assume it will be improved in the future.

A good resource to start with things is the Class Reference and an insider tip it this Unofficial Reference. I assume you already know how to get started, otherwise this tutorial can help. I omit the code around and just post my essential function:

function load() {

if (GBrowserIsCompatible()) {
var map = new GMap2(document.getElementById("map"));
map.addControl(new GLargeMapControl());
map.addControl(new GMapTypeControl());
map.setCenter(new GLatLng(37.4419, -122.1419), 1);

var point = new GLatLng(47.5,8.75);
var marker1 = new GMarker(point);


window.setTimeout(function() {
map.panTo(new GLatLng(47.5,8.75));
}, 1000);

for (var i = 1500; i < 4500; i = i + 500) {
window.setTimeout(function() {
map.zoomIn(new GLatLng(47.5,8.75), false, true);
}, i);


The map.enableDoubleClickZoom(); is very important, otherwise the zooming won't be smooth at all. The call to map.zoomIn(...) triggers a one step zoom and the loop around it is where the real magic happens. With the 500ms delay between the calls we can fake some kind of continuous animated zoom in. I am not sure about the 500ms, you may want to play around with this value. Please post a comment in case you figure out a more adequate setting.

Google Map integration

I have just installed a new version of The major new feature is the Google Map integration.

The origin of several accesses can now be displayed (watch out for the map.gif icon) on a world map. An access is shown as a mm_20_red.png marker on the map, accesses that have the same origin are combined into one marker. Click on a marker to get more information (IP, access time...).

The applet has also been repaced with a Google Map. The familiar functionality of the applet is mimiced with the Google Map's continuous zoom capacity.

This is the way the map used to look using the applet. An here you can see the new Google Maps integration.

Friday, June 8, 2007

GWT Demystified

People that want to know more about the insides of the Google Web Toolkit should read Ray Cromwell's GWT Demystified Triology. Ray Cromwell promises to digg deep into some of the more esoteric functionality of the Google Web Toolkit. His tutorials and essays are an interesting read for every advanced (or enroute to become advanced) GWT developer.

Tuesday, June 5, 2007

Google Gadget

Check out the all new Traceurl Google Gadget. With this gadget a user can keep an eye on its traceable URLs through the iGoogle website.

At the beginning I expected a lot of try and error and tons of JavaScript hacks. But the Google Gadget API is comprehensible and well documented, hence getting started was quite easy. Many examples can be found in the introduction and the Developer Gadget makes testing pretty painless.

Click here to add the Traceurl Google Gadget to your iGoogle page.

Monday, June 4, 2007

Top Free URL Shorteners

I just stumbled over a Lens about URL Shorteners at Feel free to vote for ;-)


Here we have some screenshots of

The analyse-widget:


The map displaying where a certain access came from:


Friday, June 1, 2007

GWT 1.4 RC is out

As aforementioned Traceurl is built with the Google Web Toolkit. Since yesterday the Google Web Toolkit (GWT) 1.4 Release Candidate is available for download. This is the biggest GWT release yet. In addition to bugfixes, GWT 1.4 RC includes a ton of new features, improvements and optimizations.

Google Web Toolkit 1.4 Release Candidate