Ensure GeoJSON styling works

src/components/inputs/FontInput.jsx

@@ -32,7 +32,7 @@ class FontInput extends React.Component {
       />
     })
 
-    return <div style={{display: 'inline-block', width: '51%'}}>
+    return <div style={{display: 'inline-block'}}>
       {inputs}
     </div>
   }

src/config/tilesets.json

@@ -18,9 +18,9 @@
     "url": "https://free.tilehosting.com/data/v3.json?key=25ItXg7aI5wurYDtttD",
     "title": "OpenMapTiles CDN"
   },
-  "swissnames-landscape": {
+  "naturalearth-airports": {
     "type": "geojson",
-    "data": "http://swissnames.lukasmartinelli.ch/data/landscape.geojson",
+    "data": "https://d2ad6b4ur7yvpq.cloudfront.net/naturalearth-3.3.0/ne_10m_airports.geojson",
-    "title": "Landscape Names GeoJSON"
+    "title": "NaturalEarth Airports GeoJSON"
   }
 }

src/libs/layerwatcher.js

@@ -37,7 +37,7 @@ export default class LayerWatcher {
     const previousVectorLayers = { ...this._vectorLayers }
 
     Object.keys(this._sources).forEach(sourceId => {
-      this._sources[sourceId].forEach(vectorLayerId => {
+      (this._sources[sourceId] || []).forEach(vectorLayerId => {
         const knownProperties = this._vectorLayers[vectorLayerId] || {}
         const params = { sourceLayer: vectorLayerId }
         map.querySourceFeatures(sourceId, params).forEach(feature => {

src/libs/stylegen.js

@@ -27,10 +27,9 @@ function assignVectorLayerColor(layerId) {
 }
 
 function circleLayer(source, vectorLayer, color) {
-  return {
+  const layer = {
     id: `${source}_${vectorLayer}_circle`,
     source: source,
-    'source-layer': vectorLayer,
     type: 'circle',
     paint: {
       'circle-color': color,
@@ -38,13 +37,16 @@ function circleLayer(source, vectorLayer, color) {
     },
     filter: ["==", "$type", "Point"]
   }
+  if(vectorLayer) {
+    layer['source-layer'] = vectorLayer
+  }
+  return layer
 }
 
 function polygonLayer(source, vectorLayer, color, fillColor) {
-  return {
+  const layer = {
     id: `${source}_${vectorLayer}_polygon`,
     source: source,
-    'source-layer': vectorLayer,
     type: 'fill',
     paint: {
       'fill-color': fillColor,
@@ -53,13 +55,16 @@ function polygonLayer(source, vectorLayer, color, fillColor) {
     },
     filter: ["==", "$type", "Polygon"]
   }
+  if(vectorLayer) {
+    layer['source-layer'] = vectorLayer
+  }
+  return layer
 }
 
 function lineLayer(source, vectorLayer, color) {
-  return {
+  const layer = {
     id: `${source}_${vectorLayer}_line`,
     source: source,
-    'source-layer': vectorLayer,
     layout: {
       'line-join': 'round',
       'line-cap': 'round'
@@ -70,6 +75,10 @@ function lineLayer(source, vectorLayer, color) {
     },
     filter: ["==", "$type", "LineString"]
   }
+  if(vectorLayer) {
+    layer['source-layer'] = vectorLayer
+  }
+  return layer
 }
 
 export function colorHighlightedLayer(layer) {
@@ -110,6 +119,16 @@ export function generateColoredLayers(sources) {
 
   Object.keys(sources).forEach(sourceId => {
     const layers = sources[sourceId]
+
+    // Deal with GeoJSON sources that do not have any source layers
+    if(!layers) {
+      const color = Color(assignVectorLayerColor(sourceId))
+      circleLayers.push(circleLayer(sourceId, null, color.alpha(0.3).string()))
+      lineLayers.push(lineLayer(sourceId, null, color.alpha(0.3).string()))
+      polyLayers.push(polygonLayer(sourceId, null, color.alpha(0.2).string(), color.alpha(0.05).string()))
+      return
+    }
+
     layers.forEach(layerId => {
       const color = Color(assignVectorLayerColor(layerId))
       circleLayers.push(circleLayer(sourceId, layerId, color.alpha(0.3).string()))