[OpenLayers-Users] Displaying attributes by onmouseover

[Christopher Schmidt]

On Tue, Feb 24, 2009 at 05:15:14PM +0100, Kai Behncke wrote:
> Hi Till,
> 
> 
> thank you for the code :-)
> It`s quite helpful,although I didn`t get it to run as I want so far.
> 
> The wfs is correctly visualized, I use that one:
> http://www.gastronomap.de/cgi-bin/mapserv?map=/home/promotion/behncke/gastronomap_wms/gastronomap_wfs.map&SERVICE=WFS&VERSION=1.0.0&Request=GetFeature&Typename=gastronomie_wfs
> 
> If I do a mouseover at the different points of the wfs the following
> 
> feature_info_hover(arguments[0], gastronomap_wfs) is called.
> 
> 
> I try:
> 
> function feature_info_hover(feature, myWfsLayer)
> {
> alert (myWfsLayer.getFeatureById(feature.gid));

getFeatureById is an internal-only function. It does not search by
'.gid', it searches by internally assigned OpenLayers identifiers.

-- Chris

> 
> ...and get always an alert with "null".
> 
> (an "alert (feature);" gives an alert with [object Object], so I think the arguments[0]-parameter is transported correctly).
> 
> Has anybody an idea why the gid of the feature doesn`t appear in the alert?
> 
> Best regards, Kai
> -------- Original-Nachricht --------
> > Datum: Tue, 24 Feb 2009 15:20:45 +0100
> > Von: Till Adams <adams at terrestris.de>
> > An: Kai Behncke <Kai-Behncke at gmx.de>, users at openlayers.org
> > Betreff: Re: [OpenLayers-Users] Displaying attributes by onmouseover
> 
> > Kai Behncke schrieb:
> > > Dear Openlayers-Users,
> > >
> > >
> > > I use an application with a couple of point objects (500) visualized by
> > a wms in the map.
> > >
> > > I´m looking for a function that pops up a small window (for example
> > with the name of an object) if I do a mouseover at an object in the map.
> > > I think for this using a second layer ("invisible" wfs) could be best
> > practise (or which other possibilities shall be usable)??
> > >
> > > As far as I can see a script like that does not exist in the examples
> > (if I haven`t overseen it.....).
> > > I would like to try to write one and supply it.
> > > What is the way if I want to supply a script like that to the examples?
> > >
> > > Best regards, Kai Behncke
> > >   
> > Kai,
> > 
> > 
> > we use WFS and the select feature from OL::
> > 
> > **
> >  * -------------------------------------------------------------------
> >  * feature_info_hover
> >  * function to hover a feature open a new pop up window and destroy
> >  * it after 3000 milliseconds (variable at end of function)
> >  *
> >  * @feature
> >  * -------------------------------------------------------------------
> >  */
> > function feature_info_hover(feature, myWfsLayer)
> > {
> >     if (this.popup && NABU.MAP && NABU.MAP.popups && 
> > NABU.MAP.popups.length > 0)
> >     {
> >         window.clearTimeout(this.autodestroy);
> >         this.popup.destroy();
> >         this.popup = null;
> >     }
> >     var myFeature = myWfsLayer.getFeatureById(feature.id);
> >    
> >     if (myFeature)
> >     {
> >    
> >         var window_position = new 
> > OpenLayers.LonLat(myFeature.geometry.x, myFeature.geometry.y);
> >         this.popup = new OpenLayers.Popup("ol-info-popup", 
> > window_position, null, '<div class="map-kurzinfo-popup"><span>' + 
> > myFeature.data.name + '</span><br><span onclick="javascript:OpenInfo(\'' 
> > + myFeature.data.gid + '\',\'' + myWfsLayer.typename + '\')" 
> > style="cursor:pointer;">weitere Informationen</span></div>', false);
> >         this.popup.autoSize = true;
> >         map.addPopup(this.popup, true);
> >         this.autodestroy = window.setTimeout(function()
> >         {
> >             if (map && map.popups && map.popups.length > 0)
> >             {
> >                 var len = map.popups.length;
> >                 for (var i = 0; i < len; i++)
> >                 {
> >                     if (map.popups[i] && map.popups[i].destroy)
> >                     {
> >                         map.popups[i].destroy();
> >                     }
> >                 }
> >             }
> >         }, 3000);
> >     }
> > }
> > 
> > See that we refer manually to "myFeature.data.gid", 
> > "myFeature.data.name" and "myFeature.data.typename" which is not really 
> > them ost elegant way...
> > 
> > Then initiate it through that code in the ol init function:
> > 
> > 
> >     hover.parken = new OpenLayers.Control.SelectFeature(tbl_p_parken, {
> >         callbacks: {
> >             'over': function()
> >             {
> >                 feature_info_hover(arguments[0], tbl_p_parken);
> >             }
> >         }
> >     });
> >     map.addControl(hover.parken);
> >     hover.parken.activate();
> > 
> > 
> > Where "tbl_p_parken" is our WFS defined in the layer section of the ol 
> > init function. This only works for one layer as the select feature of OL 
> > in the moment only handles one layer, this is to be changed on the next 
> > OL versions.
> > 
> > Regards, Till
> > 
> > 
> > ----------------------------------------------------------
> > terrestris GmbH & Co. KG
> > Irmintrudisstrasse 17
> > 53111 Bonn
> > Germany
> > 
> > Till Adams
> > Geschäftsführung
> > 
> > Tel: +49 (0)228 / 962 899-52
> > Fax: +49 (0)228 / 962 899-57
> > adams at terrestris.de http://www.terrestris.de
> > Amtsgericht Bonn, HRA 6835
> > ---------------------------------------------------------
> > 
> > Komplementärin:
> > 
> > terrestris Verwaltungs GmbH
> > 
> > vertreten durch:
> > Hinrich Paulsen, Till Adams
> 
> -- 
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-- 
Christopher Schmidt
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