[OpenLayers-Users] Way to detect if layer is done loading?

[Erik Uzureau]

I've had some moderate success using tables, soething like:

<table style="width:100%"><tr><td style="text-align:center">
    <img id="loadingImage" ...>
</td></tr></table>

On 10/17/07, Paul Spencer <pagameba at gmail.com> wrote:
> Placing something in the middle is tricky :)  In general, you can put
> another element inside the element your map is in ... something like:
>
> <div id="map">
>    <img id="loadingImage" ...>
> </div>
>
> and in css:
>
> #loadingImage {
>    position: absolute;
>    top: 50%;
>    left: 50%;
> }
>
> this isn't exactly in the center though.
>
> Cheers
>
> Paul
>
> On 16-Oct-07, at 9:12 PM, bradleyspencer wrote:
>
> > Paul,
> >
> > Thanks for your advice it worked a treat.
> >
> > Just one more small question. I want to place this image in the
> > middle of
> > the map which could change if I adopted a fullscreen approach. I
> > can get the
> > lon/lat of the map centre and I can convert that to pixels but it
> > does not
> > seem to be in the middle. Do you know how to do that in OL?
> >
> > Cheers,
> >
> > Brad Spencer
> > http://www.cubewerx.com.au
> >
> > -----Original Message-----
> > From: Paul Spencer [mailto:pagameba at gmail.com]
> > Sent: Wednesday, 17 October 2007 10:12 AM
> > To: brad at cubewerx.com.au
> > Cc: Christopher Schmidt; Edward Fialkowski; users at openlayers.org
> > Subject: Re: [OpenLayers-Users] Way to detect if layer is done
> > loading?
> >
> > Brad,
> >
> > you should be able to do something like this:
> >
> > /* for each layer in onload: */
> > layer.events.register('loadstart', loadStart);
> > layer.events.register('loadend', loadEnd);
> >
> >
> > /* global functions/vars */
> > var layersLoading = 0;
> > function loadStart() {
> >    if (layersLoading == 0) {
> >      showLoadingImage();
> >    }
> >    layersLoading++;
> > }
> >
> > function loadEnd() {
> >    layersLoading--;
> >    if (layersLoading == 0) {
> >      hideLoadingImage();
> >    }
> > }
> >
> > this is rudimentary, untested ...
> >
> > Cheers
> >
> > Paul
> >
> > On 16-Oct-07, at 7:27 PM, bradleyspencer wrote:
> >
> >> I am trying to implement a Loading Image as well. I have managed to
> >> use
> >> LayerLoadMonitoring example to build my own Loading thingy.
> >>
> >> See http://demo.cubewerx.com.au/layerload.html
> >>
> >> This works fine for single layers as activate the Loading Image as
> >> start of
> >> load and I kill it off once that layer has loaded.
> >>
> >> However, if there are multiple layers active and there is a time
> >> difference
> >> between loading layers, the loading image has gone after the first
> >> layer has
> >> completed loading.
> >>
> >> I'm not sure how I can modify this to kill off the Loading Image
> >> only after
> >> all layers are loaded.
> >>
> >> Can anyone help me here?
> >>
> >> Cheers,
> >>
> >>
> >> Brad Spencer
> >> http://www.cubewerx.com.au
> >>
> >> -----Original Message-----
> >> From: users-bounces at openlayers.org [mailto:users-
> >> bounces at openlayers.org]On
> >> Behalf Of Christopher Schmidt
> >> Sent: Tuesday, 16 October 2007 7:15 AM
> >> To: Edward Fialkowski
> >> Cc: users at openlayers.org
> >> Subject: Re: [OpenLayers-Users] Way to detect if layer is done
> >> loading?
> >>
> >> On Mon, Oct 15, 2007 at 03:16:14PM -0500, Edward Fialkowski wrote:
> >>> Hi List, I would really like to add a loading image to my app to
> >>> show when
> >> a
> >>> layer is still being downloaded, but I'm having difficulty getting
> >>> the
> >> right
> >>> javascript code.
> >>>
> >>> One option is if it's possible to know in openlayers when a WMS
> >>> image is
> >>> finished downloading and added to the map.
> >>>
> >>> Has anyone ever tried anything like this?
> >>
> >> http://openlayers.org/dev/examples/layerLoadMonitoring.html
> >>
> >> Regards,
> >> --
> >> Christopher Schmidt
> >> MetaCarta
> >> _______________________________________________
> >> Users mailing list
> >> Users at openlayers.org
> >> http://openlayers.org/mailman/listinfo/users
> >>
> >> _______________________________________________
> >> Users mailing list
> >> Users at openlayers.org
> >> http://openlayers.org/mailman/listinfo/users
> >
> > +-----------------------------------------------------------------+
> > |Paul Spencer                          pspencer at dmsolutions.ca    |
> > +-----------------------------------------------------------------+
> > |Chief Technology Officer                                         |
> > |DM Solutions Group Inc                http://www.dmsolutions.ca/ |
> > +-----------------------------------------------------------------+
> >
> >
>
> +-----------------------------------------------------------------+
> |Paul Spencer                          pspencer at dmsolutions.ca    |
> +-----------------------------------------------------------------+
> |Chief Technology Officer                                         |
> |DM Solutions Group Inc                http://www.dmsolutions.ca/ |
> +-----------------------------------------------------------------+
>
>
>
>
>
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