data access API

[dygraphs.git] / dygraph.js

diff --git a/dygraph.js b/dygraph.js
index 4d2d3d0..4adb716 100644 (file)
--- a/dygraph.js
+++ b/dygraph.js
@@ -352,6 +352,32 @@ Dygraph.prototype.toDataCoords = function(x, y) {
   return ret;
 };
 
+/**
+ * Returns the number of columns (including the independent variable).
+ */
+Dygraph.prototype.numColumns = function() {
+  return this.rawData_[0].length;
+};
+
+/**
+ * Returns the number of rows (excluding any header/label row).
+ */
+Dygraph.prototype.numRows = function() {
+  return this.rawData_.length;
+};
+
+/**
+ * Returns the value in the given row and column. If the row and column exceed
+ * the bounds on the data, returns null. Also returns null if the value is
+ * missing.
+ */
+Dygraph.prototype.getValue = function(row, col) {
+  if (row < 0 || row > this.rawData_.length) return null;
+  if (col < 0 || col > this.rawData_[row].length) return null;
+
+  return this.rawData_[row][col];
+};
+
 Dygraph.addEvent = function(el, evt, fn) {
   var normed_fn = function(e) {
     if (!e) var e = window.event;
@@ -803,7 +829,8 @@ Dygraph.prototype.createDragInterface_ = function() {
       var regionWidth = Math.abs(dragEndX - dragStartX);
       var regionHeight = Math.abs(dragEndY - dragStartY);
 
-      if (regionWidth < 2 && regionHeight < 2 && self.lastx_ != undefined) {
+      if (regionWidth < 2 && regionHeight < 2 &&
+          self.lastx_ != undefined && self.lastx_ != -1) {
         // TODO(danvk): pass along more info about the points, e.g. 'x'
         if (self.attr_('clickCallback') != null) {
           self.attr_('clickCallback')(event, self.lastx_, self.selPoints_);