feat(templates): add JS for maps

Add JavaScript to display Leaflet maps for
RDF imports of Place objects.

apis_ontology/templates/apis_core/apis_entities/abstractentity_form.html

@@ -0,0 +1,39 @@
+{% extends "apis_core/apis_entities/abstractentity_form.html" %}
+{% block scriptHeader %}
+    {{ block.super }}
+    <script type="text/javascript">
+function showmap(element) {
+  $('.popover').remove();
+  var rect = element.getBoundingClientRect();
+
+  mapdiv = document.createElement("div");
+  mapdiv.classList.add("popover");
+  mapdiv.setAttribute("id", "popovermap");
+  ptop = rect.top + window.scrollY - 250;
+  pleft = rect.left + window.scrollX - 550;
+  $(mapdiv).offset({top: ptop, left: pleft});
+  document.body.appendChild(mapdiv);
+
+  if (typeof map != "undefined") { map.off(); map.remove(); }
+  map = L.map('popovermap', { center: [element.dataset.latitude, element.dataset.longitude], zoom: 7 });
+  L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', { attribution: '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors' }).addTo(map);
+  L.marker([element.dataset.latitude, element.dataset.longitude]).addTo(map);
+
+};
+function delmap(element) {
+  $('.popover').remove();
+}
+    </script>
+    <style>
+#popovermap {
+  width: 500px;
+  height: 500px;
+}
+    </style>
+{% endblock %}
+{% block col-one %}
+    {{ block.super }}
+{% endblock col-one %}
+{% block scripts %}
+    {{ block.super }}
+{% endblock scripts %}