Dashboard: Auto-refresh even if focus is supported

* No change if unsupported
* If supported, still auto-refresh at the selected frequency (if any),
  but only if not hidden.

This is useful for always-on displays (e.g. a "baby clock"). Fixes #253

babybuddy/models.py

@@ -18,8 +18,8 @@ class Settings(models.Model):
     user = models.OneToOneField(User, on_delete=models.CASCADE)
     dashboard_refresh_rate = models.DurationField(
         verbose_name=_('Refresh rate'),
-        help_text=_('This setting will only be used when a browser does not '
-                    'support refresh on focus.'),
+        help_text=_('If supported by browser, the dashboard will only refresh '
+                    'when visible, and also when receiving focus.'),
         blank=True,
         null=True,
         default=timezone.timedelta(minutes=1),

dashboard/static_src/js/dashboard.js

@@ -34,6 +34,9 @@ BabyBuddy.Dashboard = function ($) {
             }
             else {
                 window.addEventListener('focus', Dashboard.handleVisibilityChange, false);
+                if (refresh_rate) {
+                    runIntervalId = setInterval(Dashboard.handleVisibilityChange, refresh_rate);
+                }
             }
         },
 

static/babybuddy/js/app.bb204baf9981.js

@@ -207,6 +207,9 @@ BabyBuddy.Dashboard = function ($) {
             }
             else {
                 window.addEventListener('focus', Dashboard.handleVisibilityChange, false);
+                if (refresh_rate) {
+                    runIntervalId = setInterval(Dashboard.handleVisibilityChange, refresh_rate);
+                }
             }
         },
 

static/babybuddy/js/app.js

@@ -207,6 +207,9 @@ BabyBuddy.Dashboard = function ($) {
             }
             else {
                 window.addEventListener('focus', Dashboard.handleVisibilityChange, false);
+                if (refresh_rate) {
+                    runIntervalId = setInterval(Dashboard.handleVisibilityChange, refresh_rate);
+                }
             }
         },