Enable hover for splom

Author: dy

src/components/fx/hover.js

@@ -265,7 +265,8 @@ function _hover(gd, evt, subplot, noHoverEvent) {
         for(curvenum = 0; curvenum < gd.calcdata.length; curvenum++) {
             cd = gd.calcdata[curvenum];
             trace = cd[0].trace;
-            if(trace.hoverinfo !== 'skip' && subplots.indexOf(helpers.getSubplot(trace)) !== -1) {
+            // FIXME: find more efficient way to check splom trace
+            if((trace.hoverinfo !== 'skip' && subplots.indexOf(helpers.getSubplot(trace)) !== -1) || trace.type === 'splom') {
                 searchData.push(cd);
             }
         }

src/plots/cartesian/graph_interact.js

@@ -26,7 +26,7 @@ module.exports = function initInteractions(gd) {
         return;
     }
 
-    if(!fullLayout._has('cartesian') && !fullLayout._has('gl2d')) return;
+    if(!fullLayout._has('cartesian') && !fullLayout._has('gl2d') && !fullLayout._has('splom')) return;
 
     var subplots = Object.keys(fullLayout._plots || {}).sort(function(a, b) {
         // sort overlays last, then by x axis number, then y axis number

src/traces/splom/index.js

@@ -196,6 +196,15 @@ function plotOne(gd, cd0) {
 
 // TODO splom 'needs' the grid component, register it here?
 
+function hoverPoints() {
+
+}
+
+function selectPoints() {
+
+}
+
+
 module.exports = {
     moduleType: 'trace',
     name: 'splom',
@@ -208,8 +217,8 @@ module.exports = {
 
     calc: calc,
     plot: plot,
-    hoverPoints: function() {},
-    selectPoints: function() {},
+    hoverPoints: hoverPoints,
+    selectPoints: selectPoints,
     style: function() {},
 
     meta: {