allow loading overlays hidden

to also not trigger addlayer event
to close #108

CHANGELOG.md

@@ -1,5 +1,6 @@
 ### Change Log for Node-RED Worldmap
 
+ - v2.0.21 - allow adding overlays without making them visible (visible:false) - Issue #108
  - v2.0.20 - ensure `fit` option is boolean, Issue #109. Fix track layers, Issue #110.
  - v2.0.18 - Stop map contextmenu bleedthrough to marker. Add compress middleware.
  - v2.0.17 - Let clear command also clear tracks from tracks node

README.md

@@ -9,6 +9,7 @@ map web page for plotting "things" on.
 
 ### Updates
 
+- v2.0.21 - allow adding overlays without making them visible (visible:false) - Issue #108
 - v2.0.20 - ensure `fit` option is boolean, Issue #109. Fix track layers, Issue #110.
 - v2.0.18 - Stop map contextmenu bleedthrough to marker. Add compress middleware.
 - v2.0.17 - Let clear command also clear tracks from tracks node
@@ -399,6 +400,8 @@ To add an overlay instead of a base layer - specify the `overlay` property inste
         "wms": true
     }
 
+By default the overlay will be instantly visible. To load it hidden add a property to the command.map - `visible:false`
+
 #### To add a new geoJSON overlay
 
     msg.payload.command.map = {
@@ -431,7 +434,7 @@ As per the geojson overlay you can also inject a KML layer, GPX layer or TOPOJSO
  - **icon** : <a href="https://fontawesome.com/v4.7.0/icons/" target="mapinfo">font awesome</a> icon name.
  - **iconColor** : Standard CSS colour name or #rrggbb hex value.
 
-Again the boolean `fit` property can be added to make the map zoom to the relevant area.
+Again the boolean `fit` property can be added to make the map zoom to the relevant area, and the `visible` property can be set false to not immediately show the layer.
 
 #### To add a Velocity Grid Overlay
 

package.json

@@ -1,6 +1,6 @@
 {
     "name": "node-red-contrib-web-worldmap",
-    "version": "2.0.20",
+    "version": "2.0.21",
     "description": "A Node-RED node to provide a web page of a world map for plotting things on.",
     "dependencies": {
         "cgi": "0.3.1",

worldmap/worldmap.js

@@ -1677,7 +1677,9 @@ function doCommand(cmd) {
         if (!existsalready) {
             layercontrol.addOverlay(overlays[cmd.map.overlay],cmd.map.overlay);
         }
+        if (!cmd.map.hasOwnProperty("visible") || (cmd.map.visible != false)) {
             map.addLayer(overlays[cmd.map.overlay]);
+        }
         if (cmd.map.hasOwnProperty("fit") && (cmd.map.fit === true)) { map.fitBounds(overlays[cmd.map.overlay].getBounds()); }
     }
     // Add a new NVG XML overlay layer
@@ -1716,7 +1718,9 @@ function doCommand(cmd) {
         if (!existsalready) {
             layercontrol.addOverlay(overlays[cmd.map.overlay],cmd.map.overlay);
         }
+        if (!cmd.map.hasOwnProperty("visible") || (cmd.map.visible != false)) {
             map.addLayer(overlays[cmd.map.overlay]);
+        }
         if (cmd.map.hasOwnProperty("fit")) { map.fitBounds(overlays[cmd.map.overlay].getBounds()); }
     }
     var custIco = function() {
@@ -1747,7 +1751,9 @@ function doCommand(cmd) {
         if (!existsalready) {
             layercontrol.addOverlay(overlays[cmd.map.overlay],cmd.map.overlay);
         }
+        if (!cmd.map.hasOwnProperty("visible") || (cmd.map.visible != false)) {
             map.addLayer(overlays[cmd.map.overlay]);
+        }
         if (cmd.map.hasOwnProperty("fit")) { map.fitBounds(overlays[cmd.map.overlay].getBounds()); }
     }
     // Add a new TOPOJSON overlay layer
@@ -1760,7 +1766,9 @@ function doCommand(cmd) {
         if (!existsalready) {
             layercontrol.addOverlay(overlays[cmd.map.overlay],cmd.map.overlay);
         }
+        if (!cmd.map.hasOwnProperty("visible") || (cmd.map.visible != false)) {
             map.addLayer(overlays[cmd.map.overlay]);
+        }
         if (cmd.map.hasOwnProperty("fit")) { map.fitBounds(overlays[cmd.map.overlay].getBounds()); }
     }
     // Add a new GPX overlay layer
@@ -1774,7 +1782,9 @@ function doCommand(cmd) {
         if (!existsalready) {
             layercontrol.addOverlay(overlays[cmd.map.overlay],cmd.map.overlay);
         }
+        if (!cmd.map.hasOwnProperty("visible") || (cmd.map.visible != false)) {
             map.addLayer(overlays[cmd.map.overlay]);
+        }
         if (cmd.map.hasOwnProperty("fit")) { map.fitBounds(overlays[cmd.map.overlay].getBounds()); }
     }
     // Add a new velocity overlay layer
@@ -1787,7 +1797,9 @@ function doCommand(cmd) {
         if (!existsalready) {
             layercontrol.addOverlay(overlays[cmd.map.overlay],cmd.map.overlay);
         }
+        if (!cmd.map.hasOwnProperty("visible") || (cmd.map.visible != false)) {
             map.addLayer(overlays[cmd.map.overlay]);
+        }
         if (cmd.map.hasOwnProperty("fit")) { map.fitBounds(overlays[cmd.map.overlay].getBounds()); }
     }
     // Add a new overlay layer
@@ -1814,8 +1826,10 @@ function doCommand(cmd) {
         if (!existsalready) {
             layercontrol.addOverlay(overlays[cmd.map.overlay],cmd.map.overlay);
         }
+        if (!cmd.map.hasOwnProperty("visible") || (cmd.map.visible != false)) {
             map.addLayer(overlays[cmd.map.overlay]);
         }
+    }
     // Swap a base layer
     if (cmd.layer && basemaps.hasOwnProperty(cmd.layer)) {
         map.removeLayer(basemaps[baselayername]);