I'm getting a report of this same problem from one of my users who is on IE7. He says the polyline is disappearing at every other level as he zooms in or out. I can't reproduce the problem with Firefox or IE8, but will try it on IE7 this weekend.
Did you find a solution Gordon? This link will display a route polyline on my site: http://www.runwayfinder.com/?loc=sea;pdx Dave On Oct 23, 1:35 pm, "[email protected]" <[email protected]> wrote: > Hi Marcelo > > I see your point on the altitude being requested 100 times and if I > get a string back then I will be able to send it without the loop to > get the values for google chart. > > However I think I am just sending I call to chart as I really just > send this url > > http://chart.apis.google.com/chart?cht=ls&chs=400x100&chco=000000&chm... > > and I get the chart back as an image. > > I'll certainly have a crack at changing the altitude request method. > > Thanks for your time and help > > Cheers > > Gordon > > On Oct 23, 9:23 pm, Marcelo <[email protected]> wrote: > > > Well, I still cannot get the line to disappear, but it could be > > because you're making the browser do so much work. > > > Aside from the 100 calls to altitude.php you are also calling Google > > Charts 100 times! That's 200 http requests before your map can render, > > where you could be doing the same with just 2 calls. > > > Try reorganizing the strategy: > > -- First read the GPX, and append each lat/lon's to a string with some > > separator. > > -- When that loop has completed call altitude.php once, with that long > > string of lat/lon's as parameter. Use the POST method if the string is > > too long. > > -- Let PHP split the string into individual points, look up the > > altitudes, wherever it does that, and return one long string of > > altitudes. > > -- Use plain text rather than XML to return results from PHP. > > -- Then call Google Charts only once, with that long string of > > altitudes. > > > That's just an overview of a strategy that should allow your page to > > load about 100 times faster. > > Give it a try and see if the polylines start behaving. > > > -- > > Marcelo -http://maps.forum.nu > > -- > > > On Oct 23, 9:27 pm, "[email protected]" > > > <[email protected]> wrote: > > > Hi Marcelo > > > > I am using FF 3.5.3 and one of my friends was getting the same problem > > > using safari, it's weird but if I zoom out and then pan out of view > > > but then come back thepolylinehas gone but the points are there (I > > > know its an issue which is never likely to happen in real life but > > > wanted to try to get it right) > > > > The reason I don't use the altitude info in the gpx file is that it is > > > so far from correct it is useless unfortunately. > > > > I'll have a look at my GDownloadUrl call and try to change it although > > > I am not particularly skilled in javascript but I am trying! > > > > Thanks > > > > Gordon > > > > On Oct 23, 8:03 pm, Marcelo <[email protected]> wrote: > > > > > On Oct 23, 9:02 pm, Marcelo <[email protected]> wrote: > > > > > > I don't see the points disappear, (Firefox 2), > > > > > Sorry, I meant I don't see the *polyline* disappear! :-) > > > > > -- > > > > Marcelo -http://maps.forum.nu > > > > -- > > > > > but there is another > > > > > > problem, and that is that you're asking the browser to do way more > > > > > work than necessary. > > > > > > You're calling the function getAltitude() maxNodes times, and that is > > > > > 100 times GDownloadUrl()! > > > > > You could send all points in one call, as POST data, and get back a > > > > > long comma separated string that you split() into an array.Then you're > > > > > done with just one GDownloadUrl call. > > > > > > Other than that, maybe I looked too quickly, but why are you calling > > > > > altitude.php if you already have the altitude in the GPX file, in the > > > > > field <ele></ele>? > > > > > > -- > > > > > Marcelo -http://maps.forum.nu > > > > > -- > > > > > > On Oct 23, 8:45 pm, "[email protected]" > > > > > > <[email protected]> wrote: > > > > > > I wonder if anyone can help me find out why mypolylinedisappears > > > > > > after zooming right out and back in again? The points remain but the > > > > > >polylinedisappears. > > > > > > >http://80.176.208.244/cycle/downloads/1/gmap.php > > > > > > > Thanks > > > > > > > Gordon --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
