Fix a display bug on empty PV.

[remoteglot] / www / js / remoteglot.js

diff --git a/www/js/remoteglot.js b/www/js/remoteglot.js
index 595bce185aa1a3457dc89cb5241fe5abee9c307e..f88e1e0dabaa6fbbdbe0bae0fee9ea6c39fddd85 100644 (file)
--- a/www/js/remoteglot.js
+++ b/www/js/remoteglot.js
@@ -48,8 +48,8 @@ var highlight_to = undefined;
 /** @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}
@@ -76,6 +76,28 @@ var current_display_line = null;
 /** @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
@@ -418,7 +440,7 @@ var print_pv = function(line_num, pretty_pv, move_num, toplay, opt_limit, opt_sh
                        ++i;
                }
                move_num += i / 2;
-       } else if (toplay == 'B') {
+       } else if (toplay == 'B' && pretty_pv.length > 0) {
                var move = "<a class=\"move\" id=\"automove" + line_num + "-0\" href=\"javascript:show_line(" + line_num + ", " + 0 + ");\">" + pretty_pv[0] + "</a>";
                pv = move_num + '. … ' + move;
                toplay = 'W';
@@ -579,9 +601,16 @@ var update_board = function(data, num_viewers) {
        if (data['score'] !== null) {
                $("#score").text(data['score']);
        }
+       if (data['short_score'] !== undefined && data['short_score'] !== null) {
+               document.title = '(' + data['short_score'] + ') analysis.sesse.net';
+       } else {
+               document.title = 'analysis.sesse.net';
+       }
 
        // The search stats.
-       if (data['nodes'] && data['nps'] && data['depth']) {
+       if (data['tablebase'] == 1) {
+               $("#searchstats").text("Tablebase result");
+       } else if (data['nodes'] && data['nps'] && data['depth']) {
                var stats = thousands(data['nodes']) + ' nodes, ' + thousands(data['nps']) + ' nodes/sec, depth ' + data['depth'] + ' ply';
                if (data['seldepth']) {
                        stats += ' (' + data['seldepth'] + ' selective)';
@@ -595,6 +624,8 @@ var update_board = function(data, num_viewers) {
                }
 
                $("#searchstats").text(stats);
+       } else {
+               $("#searchstats").text("");
        }
 
        // Update the board itself.
@@ -809,6 +840,8 @@ var update_displayed_line = function() {
 }
 
 var init = function() {
+       unique = get_unique();
+
        // Create board.
        board = new window.ChessBoard('board', 'start');
        hiddenboard = new window.ChessBoard('hiddenboard', 'start');