/** @type {?jQuery} @private */
var highlighted_move = null;
-/** @type {!number} @private */
-var unique = Math.random();
+/** @type {?number} @private */
+var unique = null;
/** The current position on the board, represented as a FEN string.
* @type {?string}
/** @type {?number} @private */
var current_display_move = null;
+var supports_html5_storage = function() {
+ try {
+ return 'localStorage' in window && window['localStorage'] !== null;
+ } catch (e) {
+ return false;
+ }
+}
+
+// Make the unique token persistent so people refreshing the page won't count twice.
+// Of course, you can never fully protect against people deliberately wanting to spam.
+var get_unique = function() {
+ var use_local_storage = supports_html5_storage();
+ if (use_local_storage && localStorage['unique']) {
+ return localStorage['unique'];
+ }
+ var unique = Math.random();
+ if (use_local_storage) {
+ localStorage['unique'] = unique;
+ }
+ return unique;
+}
+
var request_update = function() {
$.ajax({
url: "http://analysis.sesse.net/analysis.pl?ims=" + ims + "&unique=" + unique
}
var init = function() {
+ unique = get_unique();
+
// Create board.
board = new window.ChessBoard('board', 'start');
hiddenboard = new window.ChessBoard('hiddenboard', 'start');