Clearer handling of tooltip ordering with data_order option (#1813)

If data is grouped:
  - the tooltip will keep the same ordering as the stacked values

If data is not grouped:
  - the tooltip will use the data_order option to sort the values

 Also adds an optional 'tooltip_order' option. If set, it will override the data_order option.

spec/tooltip-spec.js

@@ -2,16 +2,20 @@ describe('c3 chart tooltip', function () {
     'use strict';
 
     var chart;
-    var tooltipConfiguration;
+    var tooltipConfiguration = {};
+    var dataOrder = 'desc';
+    var dataGroups;
 
     var args = function () {
         return {
             data: {
                 columns: [
-                    ['data1', 30, 200, 100, 400, 150, 250],
-                    ['data2', 50, 20, 10, 40, 15, 25],
-                    ['data3', 150, 120, 110, 140, 115, 125]
+                    ['data1', 30, 200, 100, 400, 150, 250], // 1130
+                    ['data2', 50, 20, 10, 40, 15, 25],      // 160
+                    ['data3', 150, 120, 110, 140, 115, 125] // 760
                 ],
+                order: dataOrder,
+                groups: dataGroups
             },
             tooltip: tooltipConfiguration
         };
@@ -19,6 +23,8 @@ describe('c3 chart tooltip', function () {
 
     beforeEach(function (done) {
         chart = window.initChart(chart, args(), done);
+        dataOrder = 'desc';
+        dataGroups = undefined;
     });
 
     describe('tooltip position', function () {
@@ -99,24 +105,320 @@ describe('c3 chart tooltip', function () {
         });
     });
 
-    describe('tooltip getTooltipContent', function () {
+    describe('tooltip with data_order as desc with grouped data', function() {
+        beforeAll(function() {
+            dataOrder = 'desc';
+            dataGroups = [ [ 'data1', 'data2', 'data3' ]];
+        });
+
+        it('should display each data in descending order', function() {
+            window.setMouseEvent(chart, 'mousemove', 100, 100, d3.select('.c3-event-rect-2').node());
+
+            var classes = d3.selectAll('.c3-tooltip tr')[0].map(function(node) {
+                return node.className;
+            });
+
+            expect(classes[0]).toBe(''); // header
+            expect(classes[1]).toBe('c3-tooltip-name--data1'); // 1130
+            expect(classes[2]).toBe('c3-tooltip-name--data3'); // 760
+            expect(classes[3]).toBe('c3-tooltip-name--data2'); // 160
+        });
+    });
+
+    describe('tooltip with data_order as asc with grouped data', function() {
+        beforeAll(function() {
+            dataOrder = 'asc';
+            dataGroups = [ [ 'data1', 'data2', 'data3' ]];
+        });
+
+        it('should display each data in ascending order', function() {
+            window.setMouseEvent(chart, 'mousemove', 100, 100, d3.select('.c3-event-rect-2').node());
+
+            var classes = d3.selectAll('.c3-tooltip tr')[0].map(function(node) {
+                return node.className;
+            });
+
+            expect(classes[0]).toBe(''); // header
+            expect(classes[1]).toBe('c3-tooltip-name--data2'); // 160
+            expect(classes[2]).toBe('c3-tooltip-name--data3'); // 760
+            expect(classes[3]).toBe('c3-tooltip-name--data1'); // 1130
+        });
+    });
+
+    describe('tooltip with data_order as NULL with grouped data', function() {
+        beforeAll(function() {
+            dataOrder = null;
+            dataGroups = [ [ 'data1', 'data2', 'data3' ]];
+        });
+
+        it('should display each data in given order', function() {
+            window.setMouseEvent(chart, 'mousemove', 100, 100, d3.select('.c3-event-rect-2').node());
+
+            var classes = d3.selectAll('.c3-tooltip tr')[0].map(function(node) {
+                return node.className;
+            });
+
+            expect(classes[0]).toBe(''); // header
+            expect(classes[1]).toBe('c3-tooltip-name--data1');
+            expect(classes[2]).toBe('c3-tooltip-name--data2');
+            expect(classes[3]).toBe('c3-tooltip-name--data3');
+        });
+    });
+
+    describe('tooltip with data_order as Function with grouped data', function() {
+        beforeAll(function() {
+            var order = [ 'data2', 'data1', 'data3' ];
+            dataOrder = function(data1, data2) {
+                return order.indexOf(data1.id) - order.indexOf(data2.id);
+            };
+            dataGroups = [ [ 'data1', 'data2', 'data3' ]];
+        });
+
+        it('should display each data in order given by function', function() {
+            window.setMouseEvent(chart, 'mousemove', 100, 100, d3.select('.c3-event-rect-2').node());
+
+            var classes = d3.selectAll('.c3-tooltip tr')[0].map(function(node) {
+                return node.className;
+            });
+
+            expect(classes[0]).toBe(''); // header
+            expect(classes[1]).toBe('c3-tooltip-name--data2');
+            expect(classes[2]).toBe('c3-tooltip-name--data1');
+            expect(classes[3]).toBe('c3-tooltip-name--data3');
+        });
+    });
+
+    describe('tooltip with data_order as Array with grouped data', function() {
+        beforeAll(function() {
+            dataOrder = [ 'data2', 'data1', 'data3' ];
+            dataGroups = [ [ 'data1', 'data2', 'data3' ]];
+        });
+
+        it('should display each data in order given by array', function() {
+            window.setMouseEvent(chart, 'mousemove', 100, 100, d3.select('.c3-event-rect-2').node());
+
+            var classes = d3.selectAll('.c3-tooltip tr')[0].map(function(node) {
+                return node.className;
+            });
+
+            expect(classes[0]).toBe(''); // header
+            expect(classes[1]).toBe('c3-tooltip-name--data2');
+            expect(classes[2]).toBe('c3-tooltip-name--data1');
+            expect(classes[3]).toBe('c3-tooltip-name--data3');
+        });
+    });
+
+    describe('tooltip with data_order as desc with un-grouped data', function() {
+        beforeAll(function() {
+            dataOrder = 'desc';
+        });
+
+        it('should display each tooltip value descending order', function() {
+            window.setMouseEvent(chart, 'mousemove', 100, 100, d3.select('.c3-event-rect-2').node());
+
+            var classes = d3.selectAll('.c3-tooltip tr')[0].map(function(node) {
+                return node.className;
+            });
+
+            expect(classes[0]).toBe(''); // header
+            expect(classes[1]).toBe('c3-tooltip-name--data3'); // 110
+            expect(classes[2]).toBe('c3-tooltip-name--data1'); // 100
+            expect(classes[3]).toBe('c3-tooltip-name--data2'); // 10
+        });
+    });
+
+    describe('tooltip with data_order as asc with un-grouped data', function() {
+        beforeAll(function() {
+            dataOrder = 'asc';
+        });
+
+        it('should display each tooltip value in ascending order', function() {
+            window.setMouseEvent(chart, 'mousemove', 100, 100, d3.select('.c3-event-rect-2').node());
+
+            var classes = d3.selectAll('.c3-tooltip tr')[0].map(function(node) {
+                return node.className;
+            });
+
+            expect(classes[0]).toBe(''); // header
+            expect(classes[1]).toBe('c3-tooltip-name--data2'); // 10
+            expect(classes[2]).toBe('c3-tooltip-name--data1'); // 100
+            expect(classes[3]).toBe('c3-tooltip-name--data3'); // 110
+        });
+    });
+
+    describe('tooltip with data_order as NULL with un-grouped data', function() {
+        beforeAll(function() {
+            dataOrder = null;
+        });
+
+        it('should display each tooltip value in given data order', function() {
+            window.setMouseEvent(chart, 'mousemove', 100, 100, d3.select('.c3-event-rect-2').node());
+
+            var classes = d3.selectAll('.c3-tooltip tr')[0].map(function(node) {
+                return node.className;
+            });
+
+            expect(classes[0]).toBe(''); // header
+            expect(classes[1]).toBe('c3-tooltip-name--data1');
+            expect(classes[2]).toBe('c3-tooltip-name--data2');
+            expect(classes[3]).toBe('c3-tooltip-name--data3');
+        });
+    });
+
+    describe('tooltip with data_order as Function with un-grouped data', function() {
+        beforeAll(function() {
+            var order = [ 'data2', 'data1', 'data3' ];
+            dataOrder = function(data1, data2) {
+                return order.indexOf(data1.id) - order.indexOf(data2.id);
+            };
+        });
+
+        it('should display each tooltip value in data order given by function', function() {
+            window.setMouseEvent(chart, 'mousemove', 100, 100, d3.select('.c3-event-rect-2').node());
+
+            var classes = d3.selectAll('.c3-tooltip tr')[0].map(function(node) {
+                return node.className;
+            });
+
+            expect(classes[0]).toBe(''); // header
+            expect(classes[1]).toBe('c3-tooltip-name--data2');
+            expect(classes[2]).toBe('c3-tooltip-name--data1');
+            expect(classes[3]).toBe('c3-tooltip-name--data3');
+        });
+    });
+
+    describe('tooltip with data_order as Array with un-grouped data', function() {
+        beforeAll(function() {
+            dataOrder = [ 'data2', 'data1', 'data3' ];
+        });
+
+        it('should display each tooltip value in data order given by array', function() {
+            window.setMouseEvent(chart, 'mousemove', 100, 100, d3.select('.c3-event-rect-2').node());
+
+            var classes = d3.selectAll('.c3-tooltip tr')[0].map(function(node) {
+                return node.className;
+            });
+
+            expect(classes[0]).toBe(''); // header
+            expect(classes[1]).toBe('c3-tooltip-name--data2');
+            expect(classes[2]).toBe('c3-tooltip-name--data1');
+            expect(classes[3]).toBe('c3-tooltip-name--data3');
+        });
+    });
+
+    describe('tooltip with tooltip_order as desc', function() {
         beforeAll(function() {
             tooltipConfiguration = {
-        data_order: 'desc'
+                order: 'desc'
             };
+
+            // this should be ignored
+            dataOrder = 'asc';
+            dataGroups = [ [ 'data1', 'data2', 'data3' ]];
         });
 
-    it('should sort values desc', function () {
-      var eventRect = d3.select('.c3-event-rect-2').node();
-      window.setMouseEvent(chart, 'mousemove', 100, 100, eventRect);
+        it('should display each tooltip value descending order', function() {
+            window.setMouseEvent(chart, 'mousemove', 100, 100, d3.select('.c3-event-rect-2').node());
+
+            var classes = d3.selectAll('.c3-tooltip tr')[0].map(function(node) {
+                return node.className;
+            });
+
+            expect(classes[0]).toBe(''); // header
+            expect(classes[1]).toBe('c3-tooltip-name--data3'); // 110
+            expect(classes[2]).toBe('c3-tooltip-name--data1'); // 100
+            expect(classes[3]).toBe('c3-tooltip-name--data2'); // 10
+        });
+    });
+
+    describe('tooltip with tooltip_order as asc', function() {
+        beforeAll(function() {
+            tooltipConfiguration = {
+                order: 'asc'
+            };
+
+            // this should be ignored
+            dataOrder = 'desc';
+            dataGroups = [ [ 'data1', 'data2', 'data3' ]];
+        });
+
+        it('should display each tooltip value in ascending order', function() {
+            window.setMouseEvent(chart, 'mousemove', 100, 100, d3.select('.c3-event-rect-2').node());
 
-      var tooltipTable = d3.select('.c3-tooltip')[0];
-      var expected = ["", "c3-tooltip-name--data3",
-                        "c3-tooltip-name--data1", "c3-tooltip-name--data2"];
-      var i;
-      for (i = 0; i < tooltipTable[0].rows.length; i++) {
-       expect(tooltipTable[0].rows[i].className).toBe(expected[i]);
+            var classes = d3.selectAll('.c3-tooltip tr')[0].map(function(node) {
+                return node.className;
+            });
+
+            expect(classes[0]).toBe(''); // header
+            expect(classes[1]).toBe('c3-tooltip-name--data2'); // 10
+            expect(classes[2]).toBe('c3-tooltip-name--data1'); // 100
+            expect(classes[3]).toBe('c3-tooltip-name--data3'); // 110
+        });
+    });
+
+    describe('tooltip with tooltip_order as NULL', function() {
+        beforeAll(function() {
+            tooltipConfiguration = {
+                order: null
+            };
+        });
+
+        it('should display each tooltip value in given order', function() {
+            window.setMouseEvent(chart, 'mousemove', 100, 100, d3.select('.c3-event-rect-2').node());
+
+            var classes = d3.selectAll('.c3-tooltip tr')[0].map(function(node) {
+                return node.className;
+            });
+
+            expect(classes[0]).toBe(''); // header
+            expect(classes[1]).toBe('c3-tooltip-name--data1');
+            expect(classes[2]).toBe('c3-tooltip-name--data2');
+            expect(classes[3]).toBe('c3-tooltip-name--data3');
+        });
+    });
+
+    describe('tooltip with tooltip_order as Function', function() {
+        beforeAll(function() {
+            var order = [ 'data2', 'data1', 'data3' ];
+            tooltipConfiguration = {
+                order: function(data1, data2) {
+                    return order.indexOf(data1.id) - order.indexOf(data2.id);
                 }
+            };
+        });
+
+        it('should display each tooltip value in data order given by function', function() {
+            window.setMouseEvent(chart, 'mousemove', 100, 100, d3.select('.c3-event-rect-2').node());
+
+            var classes = d3.selectAll('.c3-tooltip tr')[0].map(function(node) {
+                return node.className;
+            });
+
+            expect(classes[0]).toBe(''); // header
+            expect(classes[1]).toBe('c3-tooltip-name--data2');
+            expect(classes[2]).toBe('c3-tooltip-name--data1');
+            expect(classes[3]).toBe('c3-tooltip-name--data3');
+        });
+    });
+
+    describe('tooltip with tooltip_order as Array', function() {
+        beforeAll(function() {
+            tooltipConfiguration = {
+                order: [ 'data2', 'data1', 'data3' ]
+            };
+        });
+
+        it('should display each tooltip value in data order given by array', function() {
+            window.setMouseEvent(chart, 'mousemove', 100, 100, d3.select('.c3-event-rect-2').node());
+
+            var classes = d3.selectAll('.c3-tooltip tr')[0].map(function(node) {
+                return node.className;
+            });
+
+            expect(classes[0]).toBe(''); // header
+            expect(classes[1]).toBe('c3-tooltip-name--data2');
+            expect(classes[2]).toBe('c3-tooltip-name--data1');
+            expect(classes[3]).toBe('c3-tooltip-name--data3');
         });
     });
 });

src/config.js

@@ -203,6 +203,7 @@ c3_chart_internal_fn.getDefaultConfig = function () {
         regions: [],
         // tooltip - show when mouseover on each data
         tooltip_show: true,
+        tooltip_order: undefined,
         tooltip_grouped: true,
         tooltip_format_title: undefined,
         tooltip_format_name: undefined,

src/data.js

@@ -233,7 +233,11 @@ c3_chart_internal_fn.orderTargets = function (targets) {
         });
     } else if (isFunction(config.data_order)) {
         targets.sort(config.data_order);
-    } // TODO: accept name array for order
+    } else if (isArray(config.data_order)) {
+        targets.sort(function (t1, t2) {
+            return config.data_order.indexOf(t1.id) - config.data_order.indexOf(t2.id);
+        });
+    }
     return targets;
 };
 c3_chart_internal_fn.filterByX = function (targets, x) {

src/tooltip.js

@@ -24,31 +24,85 @@ c3_chart_internal_fn.initTooltip = function () {
             .style("display", "block");
     }
 };
-c3_chart_internal_fn.getTooltipContent = function (d, defaultTitleFormat, defaultValueFormat, color) {
-    var $$ = this, config = $$.config,
-        titleFormat = config.tooltip_format_title || defaultTitleFormat,
-        nameFormat = config.tooltip_format_name || function (name) { return name; },
-        valueFormat = config.tooltip_format_value || defaultValueFormat,
-        text, i, title, value, name, bgcolor,
-        orderAsc = $$.isOrderAsc();
+c3_chart_internal_fn.getTooltipSortFunction = function() {
+    var $$ = this, config = $$.config;
 
-    if (config.data_groups.length === 0) {
-        d.sort(function(a, b){
-            var v1 = a ? a.value : null, v2 = b ? b.value : null;
-            return orderAsc ? v1 - v2 : v2 - v1;
-        });
+    if (config.data_groups.length === 0 || config.tooltip_order !== undefined) {
+        // if data are not grouped or if an order is specified
+        // for the tooltip values we sort them by their values
+
+        var order = config.tooltip_order;
+        if (order === undefined) {
+            order = config.data_order;
+        }
+
+        var valueOf = function(obj) {
+            return obj ? obj.value : null;
+        };
+
+        // if data are not grouped, we sort them by their value
+        if (isString(order) && order.toLowerCase() === 'asc') {
+            return function(a, b) {
+                return valueOf(a) - valueOf(b);
+            };
+        } else if (isString(order) && order.toLowerCase() === 'desc') {
+            return function (a, b) {
+                return valueOf(b) - valueOf(a);
+            };
+        } else if (isFunction(order)) {
+
+            // if the function is from data_order we need
+            // to wrap the returned function in order to format
+            // the sorted value to the expected format
+
+            var sortFunction = order;
+
+            if (config.tooltip_order === undefined) {
+                sortFunction = function (a, b) {
+                    return order(a ? {
+                        id: a.id,
+                        values: [ a ]
+                    } : null, b ? {
+                        id: b.id,
+                        values: [ b ]
+                    } : null)
+                };
+            }
+
+            return sortFunction;
+
+        } else if (isArray(order)) {
+            return function(a, b) {
+                return order.indexOf(a.id) - order.indexOf(b.id);
+            }
+        }
     } else {
+        // if data are grouped, we follow the order of grouped targets
         var ids = $$.orderTargets($$.data.targets).map(function(i) {
             return i.id;
         });
-        d.sort(function(a, b) {
-            var v1 = a ? a.value : null, v2 = b ? b.value : null;
-            if (v1 > 0 && v2 > 0) {
-                v1 = a ? ids.indexOf(a.id) : null;
-                v2 = b ? ids.indexOf(b.id) : null;
+
+        // if it was either asc or desc we need to invert the order
+        // returned by orderTargets
+        if ($$.isOrderAsc() || $$.isOrderDesc()) {
+            ids = ids.reverse();
         }
-            return orderAsc ? v1 - v2 : v2 - v1;
-        });
+
+        return function(a, b) {
+            return ids.indexOf(a.id) - ids.indexOf(b.id);
+        }
+    }
+};
+c3_chart_internal_fn.getTooltipContent = function (d, defaultTitleFormat, defaultValueFormat, color) {
+    var $$ = this, config = $$.config,
+        titleFormat = config.tooltip_format_title || defaultTitleFormat,
+        nameFormat = config.tooltip_format_name || function (name) { return name; },
+        valueFormat = config.tooltip_format_value || defaultValueFormat,
+        text, i, title, value, name, bgcolor;
+
+    var tooltipSortFunction = this.getTooltipSortFunction();
+    if (tooltipSortFunction) {
+        d.sort(tooltipSortFunction);
     }
 
     for (i = 0; i < d.length; i++) {

src/util.js

@@ -7,6 +7,12 @@ var isValue = c3_chart_internal_fn.isValue = function (v) {
     isString = c3_chart_internal_fn.isString = function (o) {
         return typeof o === 'string';
     },
+    isArray = c3_chart_internal_fn.isArray = function (o) {
+        if (Array.isArray) {
+            return Array.isArray(o);
+        }
+        return Object.prototype.toString.call(o) === '[object Array]';
+    },
     isUndefined = c3_chart_internal_fn.isUndefined = function (v) {
         return typeof v === 'undefined';
     },