idxdDB.open = function () {
        var version = 1;
        var request = indexedDB.open("db_undo", version);

        // We can only create Object stores in a versionchange transaction.
        request.onupgradeneeded = function (e) {
            var db = e.target.result;

            // A versionchange transaction is started automatically.
            e.target.transaction.onerror = function (e) {
                console.log("Error", e);
            };

            if (db.objectStoreNames.contains("undo_point")) {
                db.deleteObjectStore("undo_point");
            }

            var store = db.createObjectStore("undo_point");
        };

        request.onsuccess = function (e) {
            idxdDB.db = e.target.result;

            // Clear the store
            var trans = idxdDB.db.transaction(["undo_point"], "readwrite");
            var store = trans.objectStore("undo_point");

            var req = store.clear();
            req.onsuccess = function(evt) {
                console.log("Store cleared");
                getQuota();
                listAllStore(store);
            };

        };

        request.onerror = function (e) {
            console.log("Error!", e);
        };
    };

function getQuota () {
      if (window.webkitStorageInfo && window.webkitStorageInfo.queryUsageAndQuota) {
        window.webkitStorageInfo.queryUsageAndQuota(webkitStorageInfo.TEMPORARY,
          function (used, remaining) {
              console.log("Used quota: " + used + ", remaining quota: " + remaining);
          }, function (e) {
              console.log('Error', e);
          });
      }
    }


function listAllStore (store) {
        store.openCursor().onsuccess = function(event) {
            var cursor = event.target.result;
                // if there is still another cursor to go, keep runing this code
                if(cursor) {
                    console.log (cursor);

                    // continue on to the next item in the cursor
                    cursor.continue();

                    // if there are no more cursor items to iterate through, say so, and exit the function
                } else {
                    console.log ("Cursor finished");
                }
        }
    }