Generalized cursor update

gistfile1.txt

InDB.cursor.update = function (store, index, keyRange, data, direction, on_success, on_error, on_abort) {

    var request, transaction, tx, transaction_index, update_request, cursor, value, attr;

    try {
        tx = InDB.db.transaction([database], type, timeout);
        transaction = request.objectStore(database);
    } catch (event) {
        throw ('Transaction error');
    };

    if ('undefined' !== typeof index && null !== index) {
        transaction_index = transaction.index(index);
        request = transaction_index.openCursor(keyRange, direction);
    } else {
        request = transaction.openCursor(keyRange, direction);
    }

    request.onsuccess = function (open_event) {

        cursor = open_event.target.result;
        value = open_event.target.result.value;

        for (attr in data) {
            if (data.hasOwnProperty(attr)) {
                value[attr] = data[attr];
            }
        }

        if ("undefined" !== typeof cursor && null !== cursor && "undefined" !== typeof result && null !== result) {

            update_request = cursor.update(data);

            update_request.on_success = function (event) {
                on_success(context);
                if ('function' === typeof cursor.continue) {
                    cursor.continue();
                }
            }

        }
    }

    request.onerror = function (open_event) {

        on_error(open_event);

    }

    request.onabort = function (open_event) {

        on_abort(open_event);

    }

}