feature: confirm removal of layer (origo-map#1675)

* feat: confirm removal of layer

Fixes origo-map#1674
Setting "confirmRemoval": true pops up a confirm dialog window
This commit also includes also removes redundant calls to removeOverlay-method and relies on the event instead.

* Update overlay.js

src/controls/legend/overlay.js

@@ -19,7 +19,6 @@ const OverlayLayer = function OverlayLayer(options) {
   let headerIconClass = headerIconCls;
 
   const popupMenuItems = [];
-  let layerList;
 
   const hasStylePicker = viewer.getLayerStylePicker(layer).length > 0;
   const layerIconCls = `round compact icon-small relative no-shrink light ${hasStylePicker ? 'style-picker' : ''}`;
@@ -223,8 +222,9 @@ const OverlayLayer = function OverlayLayer(options) {
       onRender() {
         const labelEl = document.getElementById(this.getId());
         labelEl.addEventListener('click', (e) => {
-          layerList.removeOverlay(layer.get('name'));
-          viewer.getMap().removeLayer(layer);
+          if (window.confirm('Vill du radera lagret?')) {
+            viewer.getMap().removeLayer(layer);
+          }
           e.preventDefault();
         });
       },
@@ -330,7 +330,6 @@ const OverlayLayer = function OverlayLayer(options) {
       this.on('clear', onRemove.bind(this));
     },
     onAdd(evt) {
-      layerList = evt.target;
       const parentEl = document.getElementById(evt.target.getId());
       const htmlString = this.render();
       const el = dom.html(htmlString);

src/controls/legend/overlays.js

@@ -206,15 +206,15 @@ const Overlays = function Overlays(options) {
     const layer = evt.element;
     const layerName = layer.get('name');
     const groupName = layer.get('group');
-    if (groupName) {
+    if (groupName && groupName !== 'root') {
       const groupCmp = groupCmps.find((cmp) => cmp.name === groupName);
       if (groupCmp) {
         groupCmp.removeOverlay(layerName);
         if (emptyGroupCheck(groupName)) {
           document.getElementById(groupCmp.getId()).classList.add('hidden');
         }
       }
-    } else {
+    } else if (groupName === 'root') {
       rootGroup.removeOverlay(layerName);
     }
   };