+// Fire when a tab is selected/clicked.
+$(document).on('shown.bs.tab', '[data-toggle="tab"]', function(event) {
+ // reload the pane (unless it's already loaded)
+ $($(event.target).attr('href')).
+ not('.pane-loaded').
+ trigger('arv:pane:reload');
+});
+
+// Ask a refreshable pane to reload via ajax.
+//
+// Target of this event is the DOM element to be updated. A reload
+// consists of an AJAX call to load the "data-pane-content-url" and
+// replace the content of the target element with the retrieved HTML.
+//
+// There are four CSS classes set on the element to indicate its state:
+// pane-loading, pane-stale, pane-loaded, pane-reload-pending
+//
+// There are five states based on the presence or absence of css classes:
+//
+// 1. Absence of any pane-* states means the pane is empty, and should
+// be loaded as soon as it becomes visible.
+//
+// 2. "pane-loading" means an AJAX call has been made to reload the
+// pane and we are waiting on a result.
+//
+// 3. "pane-loading pane-stale" means the pane is loading, but has
+// already been invalidated and should schedule a reload as soon as
+// possible after the current load completes. (This happens when there
+// is a cluster of events, where the reload is triggered by the first
+// event, but we want ensure that we eventually load the final
+// quiescent state).
+//
+// 4. "pane-loaded" means the pane is up to date.
+//
+// 5. "pane-loaded pane-reload-pending" means a reload is needed, and
+// has been scheduled, but has not started because the pane's
+// minimum-time-between-reloads throttle has not yet been reached.
+//
+$(document).on('arv:pane:reload', '[data-pane-content-url]', function(e) {
+ if (this != e.target) {
+ // An arv:pane:reload event was sent to an element (e.target)
+ // which happens to have an ancestor (this) matching the above
+ // '[data-pane-content-url]' selector. This happens because
+ // events bubble up the DOM on their way to document. However,
+ // here we only care about events delivered directly to _this_
+ // selected element (i.e., this==e.target), not ones delivered
+ // to its children. The event "e" is uninteresting here.
+ return;
+ }
+
+ // $pane, the event target, is an element whose content is to be
+ // replaced. Pseudoclasses on $pane (pane-loading, etc) encode the
+ // current loading state.
+ var $pane = $(this);
+
+ if ($pane.hasClass('pane-loading')) {
+ // Already loading, mark stale to schedule a reload after this one.
+ $pane.addClass('pane-stale');
+ return;
+ }
+
+ // The default throttle (mininum milliseconds between refreshes)
+ // can be overridden by an .arv-log-refresh-control element inside
+ // the pane -- or, failing that, the pane element itself -- with a
+ // data-load-throttle attribute. This allows the server to adjust
+ // the throttle depending on the pane content.
+ var throttle =
+ $pane.find('.arv-log-refresh-control').attr('data-load-throttle') ||
+ $pane.attr('data-load-throttle') ||
+ 15000;
+ var now = (new Date()).getTime();
+ var loaded_at = $pane.attr('data-loaded-at');
+ var since_last_load = now - loaded_at;
+ if (loaded_at && (since_last_load < throttle)) {
+ if (!$pane.hasClass('pane-reload-pending')) {
+ $pane.addClass('pane-reload-pending');
+ setTimeout((function() {
+ $pane.trigger('arv:pane:reload');
+ }), throttle - since_last_load);
+ }
+ return;
+ }
+
+ // We know this doesn't have 'pane-loading' because we tested for it above
+ $pane.removeClass('pane-reload-pending');
+ $pane.removeClass('pane-loaded');
+ $pane.removeClass('pane-stale');
+
+ if (!$pane.hasClass('active') &&
+ $pane.parent().hasClass('tab-content')) {
+ // $pane is one of the content areas in a bootstrap tabs
+ // widget, and it isn't the currently selected tab. If and
+ // when the user does select the corresponding tab, it will
+ // get a shown.bs.tab event, which will invoke this reload
+ // function again (see handler above). For now, we just insert
+ // a spinner, which will be displayed while the new content is
+ // loading.
+ $pane.html('<div class="spinner spinner-32px spinner-h-center"></div>');