From 57932ff78c94cf2e6145ae6636914ba251d9c58f Mon Sep 17 00:00:00 2001
From: Dale Price <dale@dalepricewebdesign.com>
Date: Thu, 6 Jun 2013 00:23:30 -0500
Subject: [PATCH] Check for localStorage with Modernizr before attempting to
 use it. Solves foosel/OctoPrint#91

---
 octoprint/static/js/ui.js | 47 ++++++++++++++++++++++-----------------
 1 file changed, 26 insertions(+), 21 deletions(-)

diff --git a/octoprint/static/js/ui.js b/octoprint/static/js/ui.js
index d2d0882..970aaa9 100644
--- a/octoprint/static/js/ui.js
+++ b/octoprint/static/js/ui.js
@@ -1655,43 +1655,48 @@ function ItemListHelper(listType, supportedSorting, supportedFilters, defaultSor
     //~~ local storage
 
     self._saveCurrentSortingToLocalStorage = function() {
-        self._initializeLocalStorage();
-
-        var currentSorting = self.currentSorting();
-        if (currentSorting !== undefined)
-            localStorage[self.listType + "." + "currentSorting"] = currentSorting;
-        else
-            localStorage[self.listType + "." + "currentSorting"] = undefined;
+        if ( self._initializeLocalStorage() ) {
+	        var currentSorting = self.currentSorting();
+	        if (currentSorting !== undefined)
+	            localStorage[self.listType + "." + "currentSorting"] = currentSorting;
+	        else
+	            localStorage[self.listType + "." + "currentSorting"] = undefined;
+        }
     }
 
     self._loadCurrentSortingFromLocalStorage = function() {
-        self._initializeLocalStorage();
-
-        if (_.contains(_.keys(supportedSorting), localStorage[self.listType + "." + "currentSorting"]))
-            self.currentSorting(localStorage[self.listType + "." + "currentSorting"]);
-        else
-            self.currentSorting(defaultSorting);
+        if ( self._initializeLocalStorage() ) {
+	        if (_.contains(_.keys(supportedSorting), localStorage[self.listType + "." + "currentSorting"]))
+	            self.currentSorting(localStorage[self.listType + "." + "currentSorting"]);
+	        else
+	            self.currentSorting(defaultSorting);
+	    }
     }
 
     self._saveCurrentFiltersToLocalStorage = function() {
-        self._initializeLocalStorage();
-
-        var filters = _.intersection(_.keys(self.supportedFilters), self.currentFilters());
-        localStorage[self.listType + "." + "currentFilters"] = JSON.stringify(filters);
+        if ( self._initializeLocalStorage() ) {
+	        var filters = _.intersection(_.keys(self.supportedFilters), self.currentFilters());
+	        localStorage[self.listType + "." + "currentFilters"] = JSON.stringify(filters);
+	    }
     }
 
     self._loadCurrentFiltersFromLocalStorage = function() {
-        self._initializeLocalStorage();
-
-        self.currentFilters(_.intersection(_.keys(self.supportedFilters), JSON.parse(localStorage[self.listType + "." + "currentFilters"])));
+        if ( self._initializeLocalStorage() ) {
+        	self.currentFilters(_.intersection(_.keys(self.supportedFilters), JSON.parse(localStorage[self.listType + "." + "currentFilters"])));
+        }
     }
 
     self._initializeLocalStorage = function() {
+        if (!Modernizr.localstorage)
+        	return false;
+        
         if (localStorage[self.listType + "." + "currentSorting"] !== undefined && localStorage[self.listType + "." + "currentFilters"] !== undefined && JSON.parse(localStorage[self.listType + "." + "currentFilters"]) instanceof Array)
-            return;
+            return true;
 
         localStorage[self.listType + "." + "currentSorting"] = self.defaultSorting;
         localStorage[self.listType + "." + "currentFilters"] = JSON.stringify(self.defaultFilters);
+        
+        return true;
     }
 
     self._loadCurrentFiltersFromLocalStorage();