Made a fix to calcApproxTextWidth, to fix bug on IE9.

nv.d3.js

@@ -971,15 +971,16 @@ nv.utils.pjax = function(links, content) {
 }
 
 /* For situations where we want to approximate the width in pixels for an SVG:text element.
-Most common instance is when the element is in a display:none; container. 
+Most common instance is when the element is in a display:none; container.
 Forumla is : text.length * font-size * constant_factor
 */
 nv.utils.calcApproxTextWidth = function (svgTextElem) {
-    if (svgTextElem instanceof d3.selection) {
+    if (typeof svgTextElem.style === 'function'
+        && typeof svgTextElem.text === 'function') {
         var fontSize = parseInt(svgTextElem.style("font-size").replace("px",""));
         var textLength = svgTextElem.text().length;
 
-        return textLength * fontSize * 0.5; 
+        return textLength * fontSize * 0.5;
     }
     return 0;
 };
@@ -987,8 +988,8 @@ nv.utils.calcApproxTextWidth = function (svgTextElem) {
 /* Numbers that are undefined, null or NaN, convert them to zeros.
 */
 nv.utils.NaNtoZero = function(n) {
-    if (typeof n !== 'number' 
-        || isNaN(n) 
+    if (typeof n !== 'number'
+        || isNaN(n)
         || n === null
         || n === Infinity) return 0;
 

src/utils.js

@@ -105,15 +105,16 @@ nv.utils.pjax = function(links, content) {
 }
 
 /* For situations where we want to approximate the width in pixels for an SVG:text element.
-Most common instance is when the element is in a display:none; container. 
+Most common instance is when the element is in a display:none; container.
 Forumla is : text.length * font-size * constant_factor
 */
 nv.utils.calcApproxTextWidth = function (svgTextElem) {
-    if (svgTextElem instanceof d3.selection) {
+    if (typeof svgTextElem.style === 'function'
+        && typeof svgTextElem.text === 'function') {
         var fontSize = parseInt(svgTextElem.style("font-size").replace("px",""));
         var textLength = svgTextElem.text().length;
 
-        return textLength * fontSize * 0.5; 
+        return textLength * fontSize * 0.5;
     }
     return 0;
 };
@@ -121,8 +122,8 @@ nv.utils.calcApproxTextWidth = function (svgTextElem) {
 /* Numbers that are undefined, null or NaN, convert them to zeros.
 */
 nv.utils.NaNtoZero = function(n) {
-    if (typeof n !== 'number' 
-        || isNaN(n) 
+    if (typeof n !== 'number'
+        || isNaN(n)
         || n === null
         || n === Infinity) return 0;