--- a/templates/check.html	Sun Jul 03 23:13:48 2016 +0800
+++ b/templates/check.html	Sun Jul 03 23:15:56 2016 +0800
@@ -46,19 +46,19 @@
       #}<div id="l{{ number }}"{% if 'task' in line %} data-task="{{ line['task'] }}"{% end %}{% if 'cls' in line %} class="{{ line['cls'] }}"{% end %}>{#
         #}<a href="#l{{ number }}" class="lineno" data-line-number="{{ number }}"></a>{#
         #}{{ line['text'] }}{#
-        #}{% if line.get('cls') == 'task' and line.get('task') != 'cleanup' %}{#
-          #}<a class="collapser"></a>{#
-        #}{% end %}{#
       #}</div>{#
     #}{% end %}{#
   #}</pre>
     <script>
       (function($) {
-        $('.check-log .collapser').each(function() {
-          var $collapser = $(this);
-          var $header = $collapser.closest('div');
-          var task = $header.attr('data-task');
-          var $lines = $header.nextAll('[data-task="' + task + '"]');
+        $('.check-log div.task').each(function() {
+          var $line = $(this);
+          var task = $line.attr('data-task');
+          if (task == 'cleanup') { return; }
+          var $lines = $line.nextAll('[data-task="' + task + '"]');
+          if ($lines.length === 0) { return; }
+          var $collapser = $('<a>').addClass('collapser');
+          $line.append($collapser);
           var toggle = function() {
             var collapsed = $collapser.hasClass('collapsed');
             $lines.toggleClass('uk-hidden', collapsed);