[fusion-users] Problem with layer hiding and showing.
Paul Spencer
pspencer at dmsolutions.ca
Wed Aug 6 11:32:38 EDT 2008
Tómas,
you may have been able to accomplish the same thing by passing false
as the second parameter and then calling drawMap after you had shown
or hidden all your layers.
For instance,
// layers is an array of layers to show
for (var i=0; i<layers.length; i++) {
map.showLayer(layers[i], false);
}
map.drawMap();
That being said, I would consider a change to the API that would allow
passing either a single object or an array of objects to the show/hide
layer and group functions as long as it works for both mapguide and
mapserver the same way - patches accepted.
Cheers
Paul
On 6-Aug-08, at 11:20 AM, Tómas Guðmundsson wrote:
> Thank you for that Brian.
>
> But I managed to finally solve this problem. I’m not sure if anyone
> else has countered it but at least, calling layer.show for many
> layers, that is wanting to display many layers at one time resulted
> in faulty behavior and not all layers were shown. So on line 879 in
> Mapguide.js (fusion/Mapguide/Mapguide.js) I added this function:
>
> /** function : sneShowLayers()
> * This function takes in an array of layers
> * so that multiple layers can be displayed at once
> * instead of just one at a time
> */
> sneShowLayers: function(layers, noDraw) {
> for (var i = 0; i < layers.length; i+
> +) {
>
> this.processLayerEvents(layers[i], true);
>
> this.aShowLayers.push(layers[i].uniqueId);
> }
> iif (!noDraw) {
> this.drawMap();
> }
> },
>
> /** function : sneHideLayers()
> * This function takes in an array of layers
> * so that multiple layers can be hidden at once
> * instead of just one at a time
> */
> sneHideLayers: function( layers, noDraw ) {
> for (var i = 0; i < layers.length; i+
> +) {
>
> this.processLayerEvents(layers[i], false);
>
> this.aHideLayers.push(layers[i].uniqueId);
> }
> if (!noDraw) {
> this.drawMap();
> }
> },
>
> Very similar to the showLayer function it has been altered to take
> in an array of layers instead of just a single array. This way they
> will all be pushed into the array that will be shown for the next
> draw of the map. So to fully allow for let’s say displaying all
> layers or hiding them all you have to traverse through the layer
> tree / layer legend and add every layer to a temporary array and
> then send it to this function with
> “map.sneHideLayers(layersToHideArray)” and / or
> “map.sneShowLayers(layersToShowArray)”. Hope this helps as most
> people out there.
>
> Kind regards,
> Tómas.
>
> From: Berdel, Brian [mailto:brian.berdel at mcmtrans.com]
> Sent: 6. ágúst 2008 14:46
> To: Tómas Guðmundsson; Kenneth Skovhede, GEOGRAF A/S
> Cc: fusion-users at lists.osgeo.org
> Subject: RE: [fusion-users] Problem with layer hiding and showing.
>
> Here is code to show a layer (just replace layerName)
>
> var mapWidget = Fusion.getWidgetById('Map');
> var layer = mapWidget.aMaps[0].getLayerByName(layerName);
> layer.show();
>
> Brian
>
> From: fusion-users-bounces at lists.osgeo.org [mailto:fusion-users-bounces at lists.osgeo.org
> ] On Behalf OfTómas Guðmundsson
> Sent: Wednesday, August 06, 2008 10:18 AM
> To: Kenneth Skovhede, GEOGRAF A/S
> Cc: fusion-users at lists.osgeo.org
> Subject: RE: [fusion-users] Problem with layer hiding and showing.
>
> Thanks.
>
> I am trying to use map.showLayers() but I’m not sure what parameters
> it needs.
>
> Does anyone know where the definition of layer.show() and
> layer.hide() as well as
> map.showLayers() and map.hideLayers().
>
> Regards,
> Tómas.
>
> From: Kenneth Skovhede, GEOGRAF A/S [mailto:ks at geograf.dk]
> Sent: 6. ágúst 2008 13:47
> To: Tómas Guðmundsson
> Cc: Mike Adair; fusion-users at lists.osgeo.org
> Subject: Re: [fusion-users] Problem with layer hiding and showing.
>
> I have no idea how to do this in fusion, but you will likely have to
> run through the layer list when doing a "layer.show()".
> I think there is a call that updates the map without returning the
> image. You can use that, but it will require multiple server calls
> over http.
> Regards, Kenneth Skovhede, GEOGRAF A/S
>
>
> Tómas Guðmundsson skrev:
> Thanks Kenneth,
>
> I’m trying to figure it out how I put multiple GUIDS into the
> mapagent request.
> Only way I know how to do it is with layer.show(). I’ll look more
> into it but if you
> Have it on the top of your head, any info would be great thanks.
>
> Regards,
> Tómas.
>
> From: Kenneth Skovhede, GEOGRAF A/S [mailto:ks at geograf.dk]
> Sent: 6. ágúst 2008 10:57
> To: Tómas Guðmundsson
> Cc: Mike Adair; fusion-users at lists.osgeo.org
> Subject: Re: [fusion-users] Problem with layer hiding and showing.
>
> the "ShowLayers" parameter in the "GETMAPIMAGE" call, can take
> multiple GUIDs, so you should send:
> SHOWLAYERS=118e0096-0000-1000-8000-001b2418ab2d,
> 1192c52c-0000-1000-8000-001b2418ab2d,
> 119062dc-0000-1000-8000-001b2418ab2d
> Regards, Kenneth Skovhede, GEOGRAF A/S
>
>
> Tómas Guðmundsson skrev:
> Mike, all.
>
> With some debugging this is what I find:
>
> console.log('showing :', group.layers[j], ' - ',
> group.layers[j].layerName);
> showing : Object uniqueId=118e0096-0000-1000-8000-001b2418ab2d -
> HV_loki
> showing : Object uniqueId=1192c52c-0000-1000-8000-001b2418ab2d -
> HV_brunnar
> showing : Object uniqueId=119062dc-0000-1000-8000-001b2418ab2d -
> HV_lagnir
>
> This is normal, this is what it should do. And this is printed out
> when each layer
> calls a method "layer.show()". Now, there is only one mapagent call
> that displays
> this.
>
> clientagent Fusion Viewer
> showLayers 119062dc-0000-1000-8000-001b2418ab2d
> operation GETMAPIMAGE
>
> And evidently on my map, the only layer that get's displayed is
> HV_lagnir. If I change
> the order, the last one always appears. However, the legend and
> "group.layers[j].visible"
> all result in true. It would be kind of silly to wait for 3 images
> to display 3 layers,
> so I'm wondering how this can be solved.
>
> Regards,
> Tómas
>
> -----Original Message-----
> From: fusion-users-bounces at lists.osgeo.org [mailto:fusion-users-bounces at lists.osgeo.org
> ] On Behalf Of Tómas Guðmundsson
> Sent: 6. ágúst 2008 09:05
> To: Mike Adair
> Cc: fusion-users at lists.osgeo.org
> Subject: RE: [fusion-users] Problem with layer hiding and showing.
>
> Mike,
>
> I'm afraid that all I found was the 'showlayers' parameter. And it
> was some kind of a hash,
>
> clientagent Fusion Viewer
> showLayers 0f682be6-0000-1000-8000-001b2418ab2d
> operation GETMAPIMAGE
>
> I don't quite know how to decrypt that but any help would be
> appreciated.
>
> F.y.i. this is the kind of hash that would be correct with the layers
> appropriately displayed.
>
> clientagent Fusion Viewer
> showLayers 0f65c98c-0000-1000-8000-001b2418ab2d
> operation GETMAPIMAGE
>
> The delta is only in the first part.
>
> Regards,
> Tómas.
>
> -----Original Message-----
> From: Mike Adair [mailto:madair at dmsolutions.ca]
> Sent: 5. ágúst 2008 19:20
> To: Tómas Guðmundsson
> Cc: fusion-users at lists.osgeo.org
> Subject: Re: [fusion-users] Problem with layer hiding and showing.
>
> Tomas,
>
> You should check the value of the 'showlayers' and 'hidelayers'
> parameters in the sequence of mapagent calls to GETMAPIMAGE. Those are
> the parameters that turn layers on or off. If they are what you are
> expecting, then it's possible that there is a problem with specifying
> those params, e.g. they should be comma-separated and they are not, or
> vice versa.
>
> Mike
>
> Tómas Guðmundsson wrote:
>
> Sorry about that. Everything about "If I do nothing else but reload
> the map (i.e. pan the map, zoom or refresh it) the correct layers are
> displayed on the map (all 3 or none at all).
>
> So I figure this has something to do with timing or something like
> that, of the fetching of the map itself?"
>
> Is wrong. So ignore that.
>
> Rgds.
>
> Tómas
>
> *From:* fusion-users-bounces at lists.osgeo.org
> [mailto:fusion-users-bounces at lists.osgeo.org] *On Behalf Of *Tómas
> Guðmundsson
> *Sent:* 5. ágúst 2008 13:36
> *To:* fusion-users at lists.osgeo.org
> *Subject:* [fusion-users] Problem with layer hiding and showing.
>
> Hi all.
>
> I currently have function that I am using that systematically goes
> through an array it's passed and walks through the layer legend to see
> if it finds a layer. So for every layername in a layerarray, I check
> if that layer exists and then if the checkbox is checked I show it,
> else I hide it. Now I've been debugging this and for an array of 3
> layers (this also happens for layers more than 1), I get 3 times the
> debug message "showing layer", when I check the checkbox again I get
> the debug message "hiding layer" 3 times as well.
>
> So I know this is working properly, however Mapguide Server does not
> think so. Or at least the images I get back from the server are
> missing one layer (the first one, every time). So according to the
> legend all 3 layers are visible. However, the map shows everyone
> except the first one. Now I figured this was weird, especially since
> when I try to hide them, they all are hidden except the first one
> which is now visible. And now for the final twist.
>
> If I do nothing else but reload the map (i.e. pan the map, zoom or
> refresh it) the correct layers are displayed on the map (all 3 or none
> at all).
>
> So I figure this has something to do with timing or something like
> that, of the fetching of the map itself?
>
> Please let me know if this is not clear to you and I'll try to explain
> better, but I find it weird I can not hide more than 2 layers at a
> time.
>
> Kind regards,
>
> Tómas
>
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__________________________________________
Paul Spencer
Chief Technology Officer
DM Solutions Group Inc
http://www.dmsolutions.ca/
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