title: GeoMarkers
tags: $:/tags/GeospatialDemo



\procedure onsuccess()
	<$action-setfield
		$tiddler="CurrentLocation"
		tags="$:/tags/GeoMarker"
		timestamp=<<timestamp>>
		lat=<<latitude>>
		long=<<longitude>>
		alt=<<altitude>>
		accuracy=<<accuracy>>
		altitudeAccuracy=<<altitudeAccuracy>>
		heading=<<heading>>
		speed=<<speed>>
	/>
\end
\procedure onerror()
	<$action-setfield
		$tiddler="CurrentLocation"
		$field="text"
		$value=<<error>>
	/>
\end
\procedure onclick()
	<$action-sendmessage
		$message="tm-request-geolocation"
		actionsSuccess=<<onsuccess>>
		actionsError=<<onerror>>
	/>
\end

This is a list of all the tiddlers containing ~GeoJSON markers in this wiki (identified by the tag <<tag "$:/tags/GeoMarker">>). A ~GeoJSON marker identifies a location via latitude and longitude (and optional altitude) and may also contain associated metadata in JSON format.

Click this button to create a marker from the current location. Your browser will ask for permission before granting the request. On some browsers it takes a couple of seconds for the location to appear.

<$button actions=<<onclick>>>
Request location
</$button>

{{CurrentLocation}}

<ul>
<$list filter="[all[shadows+tiddlers]tag[$:/tags/GeoMarker]sort[caption]]">
<li>
<$link>
<$view field="caption"><$view field="title"/></$view>
</$link>
</li>
</$list>
</ul>