throw real Error instances (#2160)

lib/graph3d/Filter.js

@@ -111,7 +111,7 @@ Filter.prototype.getValues = function() {
  */
 Filter.prototype.getValue = function(index) {
   if (index >= this.values.length)
-    throw 'Error: index out of range';
+    throw new Error('Index out of range');
 
   return this.values[index];
 };
@@ -164,7 +164,7 @@ Filter.prototype.setOnLoadCallback = function(callback) {
  */
 Filter.prototype.selectValue = function(index) {
   if (index >= this.values.length)
-    throw 'Error: index out of range';
+    throw new Error('Index out of range');
 
   this.index = index;
   this.value = this.values[index];

lib/graph3d/Graph3d.js

@@ -249,7 +249,7 @@ Graph3d.prototype._setBackgroundColor = function(backgroundColor) {
     // use use defaults
   }
   else {
-    throw 'Unsupported type of backgroundColor';
+    throw new Error('Unsupported type of backgroundColor');
   }
 
   this.frame.style.backgroundColor = fill;
@@ -333,7 +333,7 @@ Graph3d.prototype._determineColumnIndexes = function(data, style) {
     }
   }
   else {
-    throw 'Unknown style "' + this.style + '"';
+    throw new Error('Unknown style "' + this.style + '"');
   }
 };
 
@@ -702,7 +702,7 @@ Graph3d.prototype._resizeCanvas = function() {
  */
 Graph3d.prototype.animationStart = function() {
   if (!this.frame.filter || !this.frame.filter.slider)
-    throw 'No animation available';
+    throw new Error('No animation available');
 
   this.frame.filter.slider.play();
 };
@@ -937,7 +937,7 @@ Graph3d.prototype.setOptions = function (options) {
  */
 Graph3d.prototype.redraw = function() {
   if (this.dataPoints === undefined) {
-    throw 'Error: graph data not initialized';
+    throw new Error('Graph data not initialized');
   }
 
   this._resizeCanvas();

lib/graph3d/Slider.js

@@ -11,7 +11,7 @@ var util = require('../util');
  */
 function Slider(container, options) {
   if (container === undefined) {
-    throw 'Error: No container element defined';
+    throw new Error('No container element defined');
   }
   this.container = container;
   this.visible = (options && options.visible != undefined) ? options.visible : true;
@@ -253,7 +253,7 @@ Slider.prototype.setIndex = function(index) {
     this.onChange();
   }
   else {
-    throw 'Error: index out of range';
+    throw new Error('Index out of range');
   }
 };