[OpenLayers-Users] Re: help with removing/replacing a markerafter click event

[Nicholas Efremov-Kendall]

Caught it, it's a capitalization typo in OpenLayers. However, now the
geolocation seems to be off, and there's no marker...ideas?

On Wed, Jun 15, 2011 at 4:07 PM, Nicholas Efremov-Kendall <
n.e.kendall at gmail.com> wrote:

> Hi Arnd,
>
> Thanks for the suggestions and the examples. I've been trying to implement
> the markers on Layer.Vector adapting the code from the example you provided.
> I haven't gotten to the point of adding in the conditional statement yet,
> but I keep getting and error in the show map function at the var = feat
> line, saying that OpenLayers isn't defined. Jslint tells me this is because
> OpenLayers hasn't been defined yet. Now, I know I'm noob when it comes to
> syntax, but I'm pretty sure that OL is defined earlier. Do you know what's
> going on here?
>
> var feat;
> var markers = new OpenLayers.Layer.Vector("Markers", {styleMap: new
> OpenLayers.StyleMap({externalGraphic:
> "/OpenLayers-2.11-rc1/img/marker.png"})});
> var map = new OpenLayers.Map('map');
> function initGIS(){
> map.addControl(new OpenLayers.Control.LayerSwitcher());
> var mapnik = new OpenLayers.Layer.OSM();
> map.addLayer(mapnik);
> map.setCenter(new OpenLayers.LonLat(-90, 38).transform(new
> OpenLayers.Projection("EPSG:4326"),map.getProjectionObject()),12);
> }
>
>
> jQuery(window).ready(function(){jQuery("#btnInit").click(getLoc);});
> function getLoc(){
> if (Modernizr.geolocation) {
>  navigator.geolocation.getCurrentPosition(showMap,handle_error);
> } else {
> yqlgeo.get('visitor',norm_yql_resp);
> }
> }
>
>
> function showMap(position)
> {
> //var lonlat = new
> OpenLayers.LonLat(position.coords.longitude,position.coords.latitude).transform(new
> OpenLayers.Projection("EPSG:4326"),map.getProjectionObject());
> map.addLayer(markers);
> var feat = new
> Openlayers.LonLat(position.coords.longitude,position.coords.latitude).transform(new
> OpenLayers.Projection("EPSG:4326"),map.getProjectionObject());
> markers.addFeatures([newFeature(feat)]);
> var bounds = markers.getDataExtent();
> map.zoomToExtent(bounds);
> }
>
> function handle_error(error) {
> switch(error.code){
> case error.PERMISSION_DENIED: alert("This application reguires you to agree
> to share your location. Please reload the page to see it work properly.
> There is a privacy disclaimer at the bottom of this page. This site does not
> currently record or store these data, and in the future will not record
> unique user information without informing the user or asking their
> permission. -Virtual Spatiality");
> break;
>
> case error.POSITION_UNAVAILABLE: alert("could not determine position");
> break;
>
> case error.TIMEOUT: alert("timeout retrieving position");
> break;
>
> default: alert("unknown error");
> break;
> }
> }
>
> function norm_yql_resp(response){
> if (response.error) {
>  var error = {code : 0};
> handle_error(error);
> return;
>  }
> var position = {
> coords:
>  {
> latitude: response.place.centroid.latitude,
> longitude: response.place.centroid.longitude
>  },
> address :
> {
>  city: response.place.locality2.content,
> region: response.place.admin1.content,
>  country: response.place.country.content
> }
> };
>  handle_geolocation_query(position);
> }
> function newFeature(feat){
> var ptn = new OpenLayers.Geometry.Point(feat);
> var ptnFeat = new OpenLayers.Feature.Vector(ptn,null,null);
> return(ptnFeat);
> }
>
>
>
> On Mon, Jun 13, 2011 at 2:13 AM, Arnd Wippermann <arnd.wippermann at web.de>wrote:
>
>>  if you use Feature.Vector markers to display your markers, try
>>
>> if(vectorLayer.features.length>0)
>>     vectorLayer.removeFeatures(vectorLayer.features);
>>
>>  to remove the marker before you add a marker at the new position.
>>
>> http://gis.ibbeck.de/ginfo/apps/OLExamples/OL210/Map_mit_Marker.asp
>>
>> or use a DragFeature.Control to drag the marker around.
>>
>> http://gis.ibbeck.de/ginfo/apps/OLExamples/OL26/examples/gc_example.html
>>
>>  Or both.
>>
>> i was not able to update the position of the marker by updating the
>> geometry and redraw the feature. The label moves to the new position, but
>> the marker (the externalGraphic) wouldn't move!?
>>
>> Arnd
>>
>>
>>
>>
>>
>>  ------------------------------
>> *Von:* openlayers-users-bounces at lists.osgeo.org [mailto:
>> openlayers-users-bounces at lists.osgeo.org] *Im Auftrag von *Nicholas
>> Efremov-Kendall
>> *Gesendet:* Samstag, 11. Juni 2011 18:43
>> *An:* Rossko
>> *Cc:* users at openlayers.org
>> *Betreff:* Re: [OpenLayers-Users] Re: help with removing/replacing a
>> markerafter click event
>>
>> Hi Rosco,
>>
>> No, I hadn't thought of that. Any suggestions on how to update the
>> position of the marker, maybe a loop with a new LonLat?
>>
>> On Sat, Jun 11, 2011 at 5:00 AM, Rossko <rossko at culzean.clara.co.uk>wrote:
>>
>>> > The issue is that each time the user clicks, another marker is placed.
>>> This
>>> isn't really a problem, but for
>>> > aesthetic purposes, I'd like to destroy or remove the first marker if
>>> the
>>> > clicks again
>>>
>>> Have you considered a different approach to coding this, create one
>>> marker
>>> and move it around.
>>>
>>> --
>>> View this message in context:
>>> http://osgeo-org.1803224.n2.nabble.com/help-with-removing-replacing-a-marker-after-click-event-tp6463400p6464936.html
>>> Sent from the OpenLayers Users mailing list archive at Nabble.com.
>>> _______________________________________________
>>> Users mailing list
>>> Users at lists.osgeo.org
>>> http://lists.osgeo.org/mailman/listinfo/openlayers-users
>>>
>>
>>
>
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