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

[Nicholas Efremov-Kendall]

Fixed it, just had to mess with the way I was passing the lon-lat to the
features.

On Wed, Jun 15, 2011 at 4:12 PM, Nicholas Efremov-Kendall <
n.e.kendall at gmail.com> wrote:

> 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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