From 54f4c379dcad2be2e6b2922b9e25e46352ee604d Mon Sep 17 00:00:00 2001
From: Dan Vanderkam <danvdk@gmail.com>
Date: Wed, 10 Dec 2014 14:26:46 -0500
Subject: [PATCH 1/1] pass through (row, col) to valueFormatter

---
 auto_tests/tests/axis_labels.js | 14 +++++++++++---
 dygraph.js                      |  1 +
 plugins/legend.js               | 24 +++++++++++++-----------
 3 files changed, 25 insertions(+), 14 deletions(-)

diff --git a/auto_tests/tests/axis_labels.js b/auto_tests/tests/axis_labels.js
index a90da4b..a7e6b78 100644
--- a/auto_tests/tests/axis_labels.js
+++ b/auto_tests/tests/axis_labels.js
@@ -501,9 +501,17 @@ AxisLabelsTestCase.prototype.testValueFormatterParameters = function() {
   g.setSelection(0);
   assertEquals([
     // num or millis, opts, series, dygraph, row, col
-    [ 'x', 0, 'fn',  'x', g],
-    [ 'y', 1, 'fn', 'y1', g],
-    ['y2', 2, 'fn', 'y2', g]
+    [ 'x', 0, 'fn',  'x', g, 0, 0],
+    [ 'y', 1, 'fn', 'y1', g, 0, 1],
+    ['y2', 2, 'fn', 'y2', g, 0, 2]
+  ], calls);
+
+  calls = [];
+  g.setSelection(1);
+  assertEquals([
+    [ 'x', 1, 'fn',  'x', g, 1, 0],
+    [ 'y', 3, 'fn', 'y1', g, 1, 1],
+    ['y2', 4, 'fn', 'y2', g, 1, 2]
   ], calls);
 };
 
diff --git a/dygraph.js b/dygraph.js
index 2966316..6ae12c3 100644
--- a/dygraph.js
+++ b/dygraph.js
@@ -2042,6 +2042,7 @@ Dygraph.prototype.animateSelection_ = function(direction) {
 Dygraph.prototype.updateSelection_ = function(opt_animFraction) {
   /*var defaultPrevented = */
   this.cascadeEvents_('select', {
+    selectedRow: this.lastRow_,
     selectedX: this.lastx_,
     selectedPoints: this.selPoints_
   });
diff --git a/plugins/legend.js b/plugins/legend.js
index 71dd7f1..5c46aee 100644
--- a/plugins/legend.js
+++ b/plugins/legend.js
@@ -124,6 +124,7 @@ var escapeHTML = function(str) {
 legend.prototype.select = function(e) {
   var xValue = e.selectedX;
   var points = e.selectedPoints;
+  var row = e.selectedRow;
 
   var legendMode = e.dygraph.getOption('legend');
   if (legendMode === 'never') {
@@ -154,7 +155,7 @@ legend.prototype.select = function(e) {
     this.legend_div_.style.top = topLegend + "px";
   }
 
-  var html = legend.generateLegendHTML(e.dygraph, xValue, points, this.one_em_width_);
+  var html = legend.generateLegendHTML(e.dygraph, xValue, points, this.one_em_width_, row);
   this.legend_div_.innerHTML = html;
   this.legend_div_.style.display = '';
 };
@@ -169,7 +170,7 @@ legend.prototype.deselect = function(e) {
   var oneEmWidth = calculateEmWidthInDiv(this.legend_div_);
   this.one_em_width_ = oneEmWidth;
 
-  var html = legend.generateLegendHTML(e.dygraph, undefined, undefined, oneEmWidth);
+  var html = legend.generateLegendHTML(e.dygraph, undefined, undefined, oneEmWidth, null);
   this.legend_div_.innerHTML = html;
 };
 
@@ -212,14 +213,15 @@ legend.prototype.destroy = function() {
  * Generates HTML for the legend which is displayed when hovering over the
  * chart. If no selected points are specified, a default legend is returned
  * (this may just be the empty string).
- * @param { Number } [x] The x-value of the selected points.
- * @param { [Object] } [sel_points] List of selected points for the given
- * x-value. Should have properties like 'name', 'yval' and 'canvasy'.
- * @param { Number } [oneEmWidth] The pixel width for 1em in the legend. Only
- * relevant when displaying a legend with no selection (i.e. {legend:
- * 'always'}) and with dashed lines.
+ * @param {number} x The x-value of the selected points.
+ * @param {Object} sel_points List of selected points for the given
+ *   x-value. Should have properties like 'name', 'yval' and 'canvasy'.
+ * @param {number} oneEmWidth The pixel width for 1em in the legend. Only
+ *   relevant when displaying a legend with no selection (i.e. {legend:
+ *   'always'}) and with dashed lines.
+ * @param {number} row The selected row index.
  */
-legend.generateLegendHTML = function(g, x, sel_points, oneEmWidth) {
+legend.generateLegendHTML = function(g, x, sel_points, oneEmWidth, row) {
   // TODO(danvk): deprecate this option in place of {legend: 'never'}
   if (g.getOption('showLabelsOnHighlight') !== true) return '';
 
@@ -252,7 +254,7 @@ legend.generateLegendHTML = function(g, x, sel_points, oneEmWidth) {
   // TODO(danvk): remove this use of a private API
   var xOptView = g.optionsViewForAxis_('x');
   var xvf = xOptView('valueFormatter');
-  html = xvf(x, xOptView, labels[0], g);
+  html = xvf(x, xOptView, labels[0], g, row, 0);
   if (html !== '') {
     html += ':';
   }
@@ -275,7 +277,7 @@ legend.generateLegendHTML = function(g, x, sel_points, oneEmWidth) {
     var series = g.getPropertiesForSeries(pt.name);
     var yOptView = yOptViews[series.axis - 1];
     var fmtFunc = yOptView('valueFormatter');
-    var yval = fmtFunc(pt.yval, yOptView, pt.name, g);
+    var yval = fmtFunc(pt.yval, yOptView, pt.name, g, row, labels.indexOf(pt.name));
 
     var cls = (pt.name == highlightSeries) ? " class='highlight'" : "";
 
-- 
2.7.4