Images are not subject to the same-origin policy that applies to data loaded via XHR which is why the map tiles load fine.
One way to circumvent the browser's same-origin policy when loading data from another domain is by dynamically inserting a script tag in the DOM and using it to load the data as JSON, this technique is described in more detail here: http://ajaxpatterns.org/On-Demand_Javascript I haven't used this technique with OpenLayers, presumably you would need to implement a custom protocol to integrate with the Vector layer. Cheers Adam On 24/12/2009, at 6:17 AM, jamesmikedup...@googlemail.com wrote: > Ahh, > it seems that the tiles are being loaded, but no data. That would > explain something. > Of course loading the tiles based on the current scrolling position > would not be a security issue. > > Ok, well I will have to spend some more time to read about this, can > you please explain on thing : > > what is the difference between : > > > new OpenLayers.Layer.GML("OSM", "file.osm", {format: > OpenLayers.Format.OSM}); > > and what I was trying to do that did not work : > > new OpenLayers.Layer.Vector("Lines", { > strategies: [new OpenLayers.Strategy.Fixed()], > minZoomLevel: 1, > maxZoomLevel: 6 , > numZoomLevels: 5, > protocol: new OpenLayers.Protocol.HTTP({ > url: "test-embed_files/testway.xml", > format: new OpenLayers.Format.OSM(), > }) > }); > > Thanks, > mike > > > On Wed, Dec 23, 2009 at 5:56 PM, jamesmikedup...@googlemail.com > <jamesmikedup...@googlemail.com> wrote: >> I am looking at this example, >> http://trac.openlayers.org/browser/trunk/openlayers/examples/osm-layer.html >> >> It is using GML instead of OSM, and it is also loading from the >> openstreetmap.org domain. >> >> How can this example work if you cannot load map data from another >> domain? >> >> mike >> >> On Wed, Dec 23, 2009 at 5:16 PM, jamesmikedup...@googlemail.com >> <jamesmikedup...@googlemail.com> wrote: >>> Yes exactly, >>> but if I host the page on archive.org then I can access the data on >>> the same domain. >>> I had a misconception about this whole thing, obviously mashups are >>> going to create a lot more server sided traffic. >>> mike >>> >>> On Wed, Dec 23, 2009 at 4:29 PM, Marc Jansen >>> <jan...@terrestris.de> wrote: >>>> Hi Mike, >>>> >>>> as for OpenLayers, it shouldn't be a problem to get it hosted >>>> nearly >>>> everywhere since it is only JavaScript. Obviously you cannot use >>>> any >>>> datasource, though. Maybe you can set up a proxy that handles the >>>> requests, >>>> but I'd doubt that it is possible for your current *.blogspot.com- >>>> adress. >>>> >>>> Regards, >>>> Marc >>>> >>>> >>>> >>>> jamesmikedup...@googlemail.com wrote: >>>>> >>>>> Thanks for your advice. That is interesting. >>>>> I never did anything like this, and I feed pretty stupid right >>>>> now! >>>>> >>>>> But it will be possible to host the webpages on archive.org as >>>>> well >>>>> and work without the blog itself. It just would be nice to >>>>> separate >>>>> the display and the data storage. That effectively reduces the >>>>> usage >>>>> of openlayers to people who have control of domains, right? It >>>>> will >>>>> not be possible to people to just create maps with any data they >>>>> want >>>>> without a server to proxy the data. >>>>> >>>>> Now, this example, it displays an openstreetmap map >>>>> http://osmopenlayers.blogspot.com/2009/12/test-of-osm-server.html >>>>> >>>>> but the fetch to : >>>>> http://www.openstreetmap.org/api/0.6/way/24315294/full >>>>> that fails, or never returns. >>>>> >>>>> But the same one to use open layer to load the data from osm >>>>> fails : >>>>> http://osmopenlayers.blogspot.com/2009/12/get-osm-data-directly.html >>>>> >>>>> It calles get on this url >>>>> http://www.openstreetmap.org/api/0.6/way/24315294 >>>>> in the request XMLHttpRequest.js (line 200) >>>>> >>>>> the other thing is that I dont get any error message about >>>>> security >>>>> problems >>>>> >>>>> I found this document here: >>>>> http://docs.openlayers.org/library/request.html >>>>> >>>>> So, realistically it is not possible to host open layers on a >>>>> blog? >>>>> >>>>> >>>>> mike >>>>> >>>>> On Wed, Dec 23, 2009 at 1:37 PM, Marc Jansen >>>>> <jan...@terrestris.de> wrote: >>>>> >>>>>> >>>>>> Hi Mike, >>>>>> >>>>>> I am pretty sure that you aren't allowed to acces datasources via >>>>>> XHR/AJAX >>>>>> from other servers than the one the original page is served from. >>>>>> >>>>>> see: http://en.wikipedia.org/wiki/Same_origin_policy >>>>>> >>>>>> Just a quick guess, though. >>>>>> >>>>>> regards, >>>>>> Marc >>>>>> >>>>>> >>>>>> jamesmikedup...@googlemail.com wrote: >>>>>> >>>>>>> >>>>>>> Hi there, >>>>>>> I have attempted to embed openlayers in a blog post, >>>>>>> and am failing! Any help would be appreciated. >>>>>>> >>>>>>> using osm data hosted OSM data on archive.org >>>>>>> http://osmopenlayers.blogspot.com/2009/12/test-embed.html >>>>>>> >>>>>>> here is get a octet bytestream because archive org does not >>>>>>> say the >>>>>>> right filetype. >>>>>>> http://ia341335.us.archive.org/2/items/ZCTA_NJ/zip_07003.poly.osm >>>>>>> this >>>>>>> returns a 206 partial content and fails. >>>>>>> >>>>>>> in a pastebin file that is delivered as text: >>>>>>> http://osmopenlayers.blogspot.com/2009/12/hosting-on-pastebin.html >>>>>>> Date Wed, 23 Dec 2009 10:15:43 GMT >>>>>>> Server Apache/1.3.33 (Debian GNU/Linux) mod_python/2.7.10 >>>>>>> Python/2.3.4 >>>>>>> PHP/4.3.10-22 mod_perl/1.29 >>>>>>> X-Powered-By PHP/4.3.10-22 >>>>>>> Content-Disposition attachment; filename="f28514ba0.txt" >>>>>>> Keep-Alive timeout=15, max=100 >>>>>>> Connection Keep-Alive >>>>>>> Transfer-Encoding chunked >>>>>>> Content-Type text/plain; charset=iso-8859-1 >>>>>>> >>>>>>> So the problem might be the attachment... >>>>>>> >>>>>>> and that data from osm directly again on pastebin, >>>>>>> >>>>>>> >>>>>>> http://osmopenlayers.blogspot.com/2009/12/osm-data-from-xml-output-on-pastebin.html >>>>>>> data is here :http://pastebin.com/pastebin.php?dl=f290d5ea6 it >>>>>>> returns a >>>>>>> 200 ok. >>>>>>> It returns an : text/plain; charset=iso-8859-1 but does not >>>>>>> render. >>>>>>> But there is still nothing there >>>>>>> >>>>>>> from osm directly >>>>>>> http://osmopenlayers.blogspot.com/2009/12/get-osm-data-directly.html >>>>>>> firebug says :no element found >>>>>>> >>>>>>> And my last try was to put the code from osm on the page >>>>>>> directly, >>>>>>> also not rendering but the xml is loading. >>>>>>> http://osmopenlayers.blogspot.com/2009/12/test-of-osm- >>>>>>> server.html >>>>>>> >>>>>>> but nothing is working >>>>>>> >>>>>>> would appreciate any tips and help >>>>>>> thanks >>>>>>> mike >>>>>>> _______________________________________________ >>>>>>> Users mailing list >>>>>>> Users@openlayers.org >>>>>>> http://openlayers.org/mailman/listinfo/users >>>>>>> >>>>>>> >>>>>>> >>>> >>>> >>> >> > _______________________________________________ > Users mailing list > Users@openlayers.org > http://openlayers.org/mailman/listinfo/users _______________________________________________ Users mailing list Users@openlayers.org http://openlayers.org/mailman/listinfo/users