Array support for trace hoverinfo

src/components/fx/calc.js

@@ -13,25 +13,41 @@ var Registry = require('../../registry');
 
 module.exports = function calc(gd) {
     var calcdata = gd.calcdata;
+    var fullLayout = gd._fullLayout;
+
+    function makeCoerceHoverInfo(trace) {
+        return function(val) {
+            return Lib.coerceHoverinfo({hoverinfo: val}, {_module: trace._module}, fullLayout);
+        };
+    }
 
     for(var i = 0; i < calcdata.length; i++) {
         var cd = calcdata[i];
         var trace = cd[0].trace;
 
-        if(!trace.hoverlabel) continue;
+        // don't include hover calc fields for pie traces
+        // as calcdata items might be sorted by value and
+        // won't match the data array order.
+        if(Registry.traceIs(trace, 'pie')) continue;
+
+        var fillFn = Registry.traceIs(trace, '2dMap') ? paste : Lib.fillArray;
 
-        var mergeFn = Registry.traceIs(trace, '2dMap') ? paste : Lib.mergeArray;
+        fillFn(trace.hoverinfo, cd, 'hi', makeCoerceHoverInfo(trace));
 
-        mergeFn(trace.hoverlabel.bgcolor, cd, 'hbg');
-        mergeFn(trace.hoverlabel.bordercolor, cd, 'hbc');
-        mergeFn(trace.hoverlabel.font.size, cd, 'hts');
-        mergeFn(trace.hoverlabel.font.color, cd, 'htc');
-        mergeFn(trace.hoverlabel.font.family, cd, 'htf');
+        if(!trace.hoverlabel) continue;
+
+        fillFn(trace.hoverlabel.bgcolor, cd, 'hbg');
+        fillFn(trace.hoverlabel.bordercolor, cd, 'hbc');
+        fillFn(trace.hoverlabel.font.size, cd, 'hts');
+        fillFn(trace.hoverlabel.font.color, cd, 'htc');
+        fillFn(trace.hoverlabel.font.family, cd, 'htf');
     }
 };
 
-function paste(traceAttr, cd, cdAttr) {
+function paste(traceAttr, cd, cdAttr, fn) {
+    fn = fn || Lib.identity;
+
     if(Array.isArray(traceAttr)) {
-        cd[0][cdAttr] = traceAttr;
+        cd[0][cdAttr] = fn(traceAttr);
     }
 }

src/components/fx/hover.js

@@ -354,11 +354,11 @@ function _hover(gd, evt, subplot) {
             trace: trace,
             xa: xaArray[subploti],
             ya: yaArray[subploti],
-            name: (gd.data.length > 1 || trace.hoverinfo.indexOf('name') !== -1) ? trace.name : undefined,
             // point properties - override all of these
             index: false, // point index in trace - only used by plotly.js hoverdata consumers
             distance: Math.min(distance, constants.MAXDIST), // pixel distance or pseudo-distance
             color: Color.defaultLine, // trace color
+            name: trace.name,
             x0: undefined,
             x1: undefined,
             y0: undefined,
@@ -558,7 +558,7 @@ function createHoverText(hoverData, opts) {
     // to have common labels
     var i, traceHoverinfo;
     for(i = 0; i < hoverData.length; i++) {
-        traceHoverinfo = hoverData[i].trace.hoverinfo;
+        traceHoverinfo = hoverData[i].hoverinfo || hoverData[i].trace.hoverinfo;
         var parts = traceHoverinfo.split('+');
         if(parts.indexOf('all') === -1 &&
             parts.indexOf(hovermode) === -1) {
@@ -724,7 +724,9 @@ function createHoverText(hoverData, opts) {
         else if(d.yLabel === undefined) text = d.xLabel;
         else text = '(' + d.xLabel + ', ' + d.yLabel + ')';
 
-        if(d.text && !Array.isArray(d.text)) text += (text ? '<br>' : '') + d.text;
+        if(d.text && !Array.isArray(d.text)) {
+            text += (text ? '<br>' : '') + d.text;
+        }
 
         // if 'text' is empty at this point,
         // put 'name' in main label and don't show secondary label
@@ -1056,6 +1058,30 @@ function cleanPoint(d, hovermode) {
     var cd0 = d.cd[0];
     var cd = d.cd[d.index] || {};
 
+    function fill(key, calcKey, traceKey) {
+        var val;
+
+        if(cd[calcKey]) {
+            val = cd[calcKey];
+        } else if(cd0[calcKey]) {
+            var arr = cd0[calcKey];
+            if(Array.isArray(arr) && Array.isArray(arr[d.index[0]])) {
+                val = arr[d.index[0]][d.index[1]];
+            }
+        } else {
+            val = Lib.nestedProperty(trace, traceKey).get();
+        }
+
+        if(val) d[key] = val;
+    }
+
+    fill('hoverinfo', 'hi', 'hoverinfo');
+    fill('color', 'hbg', 'hoverlabel.bgcolor');
+    fill('borderColor', 'hbc', 'hoverlabel.bordercolor');
+    fill('fontFamily', 'htf', 'hoverlabel.font.family');
+    fill('fontSize', 'hts', 'hoverlabel.font.size');
+    fill('fontColor', 'htc', 'hoverlabel.font.color');
+
     d.posref = hovermode === 'y' ? (d.x0 + d.x1) / 2 : (d.y0 + d.y1) / 2;
 
     // then constrain all the positions to be on the plot
@@ -1123,7 +1149,7 @@ function cleanPoint(d, hovermode) {
         if(hovermode === 'y') d.distance += 1;
     }
 
-    var infomode = d.trace.hoverinfo;
+    var infomode = d.hoverinfo || d.trace.hoverinfo;
     if(infomode !== 'all') {
         infomode = infomode.split('+');
         if(infomode.indexOf('x') === -1) d.xLabel = undefined;
@@ -1133,29 +1159,6 @@ function cleanPoint(d, hovermode) {
         if(infomode.indexOf('name') === -1) d.name = undefined;
     }
 
-    function fill(key, calcKey, traceKey) {
-        var val;
-
-        if(cd[calcKey]) {
-            val = cd[calcKey];
-        } else if(cd0[calcKey]) {
-            var arr = cd0[calcKey];
-            if(Array.isArray(arr) && Array.isArray(arr[d.index[0]])) {
-                val = arr[d.index[0]][d.index[1]];
-            }
-        } else {
-            val = Lib.nestedProperty(trace, traceKey).get();
-        }
-
-        if(val) d[key] = val;
-    }
-
-    fill('color', 'hbg', 'hoverlabel.bgcolor');
-    fill('borderColor', 'hbc', 'hoverlabel.bordercolor');
-    fill('fontFamily', 'htf', 'hoverlabel.font.family');
-    fill('fontSize', 'hts', 'hoverlabel.font.size');
-    fill('fontColor', 'htc', 'hoverlabel.font.color');
-
     return d;
 }
 

src/components/fx/index.js

@@ -35,7 +35,9 @@ module.exports = {
     getDistanceFunction: helpers.getDistanceFunction,
     getClosest: helpers.getClosest,
     inbox: helpers.inbox,
+
     castHoverOption: castHoverOption,
+    castHoverinfo: castHoverinfo,
 
     hover: require('./hover').hover,
     unhover: dragElement.unhover,
@@ -57,18 +59,16 @@ function loneUnhover(containerOrSelection) {
     selection.selectAll('.spikeline').remove();
 }
 
-// Handler for trace-wide vs per-point hover label options
+// helpers for traces that use Fx.loneHover
+
 function castHoverOption(trace, ptNumber, attr) {
-    var labelOpts = trace.hoverlabel || {};
-    var val = Lib.nestedProperty(labelOpts, attr).get();
-
-    if(Array.isArray(val)) {
-        if(Array.isArray(ptNumber) && Array.isArray(val[ptNumber[0]])) {
-            return val[ptNumber[0]][ptNumber[1]];
-        } else {
-            return val[ptNumber];
-        }
-    } else {
-        return val;
+    return Lib.castOption(trace, ptNumber, 'hoverlabel.' + attr);
+}
+
+function castHoverinfo(trace, fullLayout, ptNumber) {
+    function _coerce(val) {
+        return Lib.coerceHoverinfo({hoverinfo: val}, {_module: trace._module}, fullLayout);
     }
+
+    return Lib.castOption(trace, ptNumber, 'hoverinfo', _coerce);
 }

src/lib/coerce.js

@@ -12,6 +12,7 @@
 var isNumeric = require('fast-isnumeric');
 var tinycolor = require('tinycolor2');
 
+var baseTraceAttrs = require('../plots/attributes');
 var getColorscale = require('../components/colorscale/get_scale');
 var colorscaleNames = Object.keys(require('../components/colorscale/scales'));
 var nestedProperty = require('./nested_property');
@@ -196,7 +197,7 @@ exports.valObjects = {
             'Values in `extras` cannot be combined.'
         ].join(' '),
         requiredOpts: ['flags'],
-        otherOpts: ['dflt', 'extras'],
+        otherOpts: ['dflt', 'extras', 'arrayOk'],
         coerceFunction: function(v, propOut, dflt, opts) {
             if(typeof v !== 'string') {
                 propOut.set(dflt);
@@ -338,6 +339,35 @@ exports.coerceFont = function(coerce, attr, dfltObj) {
     return out;
 };
 
+/** Coerce shortcut for 'hoverinfo'
+ * handling 1-vs-multi-trace dflt logic
+ *
+ * @param {object} traceIn : user trace object
+ * @param {object} traceOut : full trace object (requires _module ref)
+ * @param {object} layoutOut : full layout object (require _dataLength ref)
+ * @return {any} : the coerced value
+ */
+exports.coerceHoverinfo = function(traceIn, traceOut, layoutOut) {
+    var moduleAttrs = traceOut._module.attributes;
+    var attrs = moduleAttrs.hoverinfo ?
+        {hoverinfo: moduleAttrs.hoverinfo} :
+        baseTraceAttrs;
+
+    var valObj = attrs.hoverinfo;
+    var dflt;
+
+    if(layoutOut._dataLength === 1) {
+        var flags = valObj.dflt === 'all' ?
+            valObj.flags.slice() :
+            valObj.dflt.split('+');
+
+        flags.splice(flags.indexOf('name'), 1);
+        dflt = flags.join('+');
+    }
+
+    return exports.coerce(traceIn, traceOut, attrs, 'hoverinfo', dflt);
+};
+
 exports.validate = function(value, opts) {
     var valObject = exports.valObjects[opts.valType];
 

src/lib/index.js

@@ -31,6 +31,7 @@ lib.valObjects = coerceModule.valObjects;
 lib.coerce = coerceModule.coerce;
 lib.coerce2 = coerceModule.coerce2;
 lib.coerceFont = coerceModule.coerceFont;
+lib.coerceHoverinfo = coerceModule.coerceHoverinfo;
 lib.validate = coerceModule.validate;
 
 var datesModule = require('./dates');
@@ -349,13 +350,67 @@ lib.noneOrAll = function(containerIn, containerOut, attrList) {
     }
 };
 
+/** merges calcdata field (given by cdAttr) with traceAttr values
+ *
+ * N.B. Loop over minimum of cd.length and traceAttr.length
+ * i.e. it does not try to fill in beyond traceAttr.length-1
+ *
+ * @param {array} traceAttr : trace attribute
+ * @param {object} cd : calcdata trace
+ * @param {string} cdAttr : calcdata key
+ */
 lib.mergeArray = function(traceAttr, cd, cdAttr) {
     if(Array.isArray(traceAttr)) {
         var imax = Math.min(traceAttr.length, cd.length);
         for(var i = 0; i < imax; i++) cd[i][cdAttr] = traceAttr[i];
     }
 };
 
+/** fills calcdata field (given by cdAttr) with traceAttr values
+ *  or function of traceAttr values (e.g. some fallback)
+ *
+ * N.B. Loops over all cd items.
+ *
+ * @param {array} traceAttr : trace attribute
+ * @param {object} cd : calcdata trace
+ * @param {string} cdAttr : calcdata key
+ * @param {function} [fn] : optional function to apply to each array item
+ */
+lib.fillArray = function(traceAttr, cd, cdAttr, fn) {
+    fn = fn || lib.identity;
+
+    if(Array.isArray(traceAttr)) {
+        for(var i = 0; i < cd.length; i++) {
+            cd[i][cdAttr] = fn(traceAttr[i]);
+        }
+    }
+};
+
+/** Handler for trace-wide vs per-point options
+ *
+ * @param {object} trace : (full) trace object
+ * @param {number} ptNumber : index of the point in question
+ * @param {string} astr : attribute string
+ * @param {function} [fn] : optional function to apply to each array item
+ *
+ * @return {any}
+ */
+lib.castOption = function(trace, ptNumber, astr, fn) {
+    fn = fn || lib.identity;
+
+    var val = lib.nestedProperty(trace, astr).get();
+
+    if(Array.isArray(val)) {
+        if(Array.isArray(ptNumber) && Array.isArray(val[ptNumber[0]])) {
+            return fn(val[ptNumber[0]][ptNumber[1]]);
+        } else {
+            return fn(val[ptNumber]);
+        }
+    } else {
+        return val;
+    }
+};
+
 /** Returns target as set by 'target' transform attribute
  *
  * @param {object} trace : full trace object

src/plot_api/helpers.js

@@ -415,7 +415,7 @@ exports.swapXYData = function(trace) {
             Lib.swapAttrs(trace, ['error_?.color', 'error_?.thickness', 'error_?.width']);
         }
     }
-    if(trace.hoverinfo) {
+    if(typeof trace.hoverinfo === 'string') {
         var hoverInfoParts = trace.hoverinfo.split('+');
         for(i = 0; i < hoverInfoParts.length; i++) {
             if(hoverInfoParts[i] === 'x') hoverInfoParts[i] = 'y';

src/plot_api/plot_schema.js

@@ -156,6 +156,7 @@ exports.findArrayAttributes = function(trace) {
         return stack.join('.');
     }
 
+    exports.crawl(baseAttributes, callback);
     exports.crawl(trace._module.attributes, callback);
 
     if(trace.transforms) {

src/plots/attributes.js

@@ -74,6 +74,7 @@ module.exports = {
         role: 'info',
         flags: ['x', 'y', 'z', 'text', 'name'],
         extras: ['all', 'none', 'skip'],
+        arrayOk: true,
         dflt: 'all',
         description: [
             'Determines which trace information appear on hover.',

src/plots/gl2d/scene2d.js

@@ -623,8 +623,11 @@ proto.draw = function() {
                 // also it's important to copy, otherwise data is lost by the time event data is read
                 this.emitPointAction(nextSelection, 'plotly_hover');
 
-                var hoverinfo = selection.hoverinfo;
-                if(hoverinfo !== 'all') {
+                var trace = this.fullData[selection.trace.index] || {};
+                var ptNumber = selection.pointIndex;
+                var hoverinfo = Fx.castHoverinfo(trace, fullLayout, ptNumber);
+
+                if(hoverinfo && hoverinfo !== 'all') {
                     var parts = hoverinfo.split('+');
                     if(parts.indexOf('x') === -1) selection.traceCoord[0] = undefined;
                     if(parts.indexOf('y') === -1) selection.traceCoord[1] = undefined;
@@ -633,9 +636,6 @@ proto.draw = function() {
                     if(parts.indexOf('name') === -1) selection.name = undefined;
                 }
 
-                var trace = this.fullData[selection.trace.index] || {};
-                var ptNumber = selection.pointIndex;
-
                 Fx.loneHover({
                     x: selection.screenCoord[0],
                     y: selection.screenCoord[1],

src/plots/gl3d/scene.js

@@ -67,8 +67,8 @@ function render(scene) {
     if(lastPicked !== null) {
         var pdata = project(scene.glplot.cameraParams, selection.dataCoordinate);
         trace = lastPicked.data;
-        var hoverinfo = trace.hoverinfo;
         var ptNumber = selection.index;
+        var hoverinfo = Fx.castHoverinfo(trace, scene.fullLayout, ptNumber);
 
         var xVal = formatter('xaxis', selection.traceCoordinate[0]),
             yVal = formatter('yaxis', selection.traceCoordinate[1]),