Gregory, yes, you are right. This is the solution. I have changed it all (and corrected the faults that came in when I seperated the code) and now it works.
Thanks very much...Guido On 23 Jul., 16:17, Gregory Short <[email protected]> wrote: > GDownloadUrl is asynchronous. That is to say: what it does, it does in > its own time. There is absolutely no guarantee that the callback (in > your case, CheckDataAndResponse) will occur before the lines of code > following it. And in your case, it clearly *isn't* being completed > before those lines of code. You are trying to parse the xml (contained > in markerdata) before the xml has even completed downloading. > Therefore, you must adjust your code so that you only try to use that > data once it is ready. I still don't see why you can't adopt the > suggestion I made: any time you want to update the map without > reloading the entire page, you would then simply clear the old markers > and call GDownloadUrl("data.xml", CheckDataAndResponse); > again...CheckDataAndResponse is only called once the operation is > complete, which is why all your data-handling should be activated by > that callback. > > -G > > On Jul 23, 2009, at 9:08 AM, guido wrote: > > > > > > > Hi Gregory, > > > On 23 Jul., 15:59, Gregory Short <[email protected]> wrote: > >> function parseMarkerData() > >> { > >> var xml = GXml.parse(data); // <--- Where is "data" being > >> defined? > >> return xml.documentElement.getElementsByTagName("marker"); > >> } > >> Perhaps you meant "markerdata"... > > > yes sure. I changed the variable name a few minutes ago. I have > > corrected this. But I think you understood the problem cause... > >> but then you have problems with the > >> asynchronous nature of GDownloadUrl > > > I don't know nothing about this. I do all this with the markers, cause > > I want to create automatically moving markers on a map without > > reloading the map each time. Therefore I have to seperate the loading > > of the map the reading of the markers and the craeting of the markers > > as well. > > >> ...One solution might be to fire > >> off the chain of function calls that parses the xml and populates the > >> map from within CheckDataAndResponse. > >> On Jul 23, 2009, at 8:41 AM, guido wrote: > > > As you may understand this wouldn't be possible I think. > > >>> Hi @all > > >>> I have a problem using GDownloadUrl and accessing the data coming > >>> into > >>> the callback function. I must say that I am really new to Google > >>> maps > >>> and to Javascript so please be patient. The link to my site is > >>>http://status.taxikomm24.de/10/index_neu.html > > >>> As you can see if the callback function "CheckDataAndResponse" is > >>> called all the data is perfectly there. But as soon as I want to > >>> access the variable makerdata, which is defined as global, in the > >>> function "INITMap". The variable markerdata is undefined. > > >>> Please can someone help me with this. Any suggesition is welcome. > > >>> Thanks..Guido- Zitierten Text ausblenden - > > >> - Zitierten Text anzeigen -- Zitierten Text ausblenden - > > - Zitierten Text anzeigen - --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google Maps API" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/Google-Maps-API?hl=en -~----------~----~----~----~------~----~------~--~---
