Support zooming with keyboard. Fixes #695

js/id/ui.js

@@ -251,7 +251,11 @@ iD.ui = function(context) {
             .on('←', pan([pa, 0]))
             .on('↑', pan([0, pa]))
             .on('→', pan([-pa, 0]))
-            .on('↓', pan([0, -pa]));
+            .on('↓', pan([0, -pa]))
+            .on('⇧+=', function() { map.zoomIn(); })
+            .on('+', function() { map.zoomIn(); })
+            .on('-', function() { map.zoomOut(); })
+            .on('dash', function() { map.zoomOut(); });
 
         modes.forEach(function(m) {
             keybinding.on(m.key, function() { if (map.editable()) context.enter(m); });

js/lib/d3.keybinding.js

@@ -151,7 +151,7 @@ d3.keybinding = function(namespace) {
         '=': 187, 'equals': 187,
         // Comma, or ,
         ',': 188, comma: 188,
-        //'-': 189, //???
+        'dash': 189, //???
         // Period, or ., or full-stop
         '.': 190, period: 190, 'full-stop': 190,
         // Slash, or /, or forward-slash