Refs #4300 Adding Array.reduce fallback for IE8. Array.reduce is used in jqplot.

plugins/Zeitgeist/javascripts/piwikHelper.js

@@ -322,17 +322,65 @@ function isEnterKey(e)
 
 // workarounds
 (function($){
-try { // this code is not vital, so we make sure any errors are ignored
+try {
+    // this code is not vital, so we make sure any errors are ignored
 
-// monkey patch that works around bug in arc function of some browsers where
-// nothing gets drawn if angles are 2 * PI apart and in counter-clockwise direction.
-// affects some versions of chrome & IE 8
-var oldArc = CanvasRenderingContext2D.prototype.arc;
-CanvasRenderingContext2D.prototype.arc = function(x, y, r, sAngle, eAngle, clockwise) {
-	if (Math.abs(eAngle - sAngle - Math.PI * 2) < 0.000001 && !clockwise)
-		eAngle -= 0.000001;
-	oldArc.call(this, x, y, r, sAngle, eAngle, clockwise);
-};
+    //--------------------------------------
+    //
+    // monkey patch that works around bug in arc function of some browsers where
+    // nothing gets drawn if angles are 2 * PI apart and in counter-clockwise direction.
+    // affects some versions of chrome & IE 8
+    //
+    //--------------------------------------
+    var oldArc = CanvasRenderingContext2D.prototype.arc;
+    CanvasRenderingContext2D.prototype.arc = function(x, y, r, sAngle, eAngle, clockwise) {
+        if (Math.abs(eAngle - sAngle - Math.PI * 2) < 0.000001 && !clockwise)
+            eAngle -= 0.000001;
+        oldArc.call(this, x, y, r, sAngle, eAngle, clockwise);
+    };
 
+    //--------------------------------------
+    //
+    // Array.reduce is not available in IE8 but used in Jqplot
+    //
+    //--------------------------------------
+    if ('function' !== typeof Array.prototype.reduce) {
+        Array.prototype.reduce = function(callback, opt_initialValue){
+            'use strict';
+            if (null === this || 'undefined' === typeof this) {
+                // At the moment all modern browsers, that support strict mode, have
+                // native implementation of Array.prototype.reduce. For instance, IE8
+                // does not support strict mode, so this check is actually useless.
+                throw new TypeError(
+                    'Array.prototype.reduce called on null or undefined');
+            }
+            if ('function' !== typeof callback) {
+                throw new TypeError(callback + ' is not a function');
+            }
+            var index, value,
+                length = this.length >>> 0,
+                isValueSet = false;
+            if (1 < arguments.length) {
+                value = opt_initialValue;
+                isValueSet = true;
+            }
+            for (index = 0; length > index; ++index) {
+                if (this.hasOwnProperty(index)) {
+                    if (isValueSet) {
+                        value = callback(value, this[index], index, this);
+                    }
+                    else {
+                        value = this[index];
+                        isValueSet = true;
+                    }
+                }
+            }
+            if (!isValueSet) {
+                throw new TypeError('Reduce of empty array with no initial value');
+            }
+            return value;
+        };
+    }
 } catch (e) {}
 }(jQuery));
+