Partially revert "Hotfix: Remove obsolete jQuery code for competition…

…s form page"

This reverts parts of commit ff8b065.
It reinstates interactive parts of the competition overview page

app/assets/javascripts/competitions.js

@@ -0,0 +1,67 @@
+// Sets map container height.
+function resizeMapContainer() {
+  var formHeight = $('#competition-query-form').outerHeight(true);
+  var footerHeight = $('.footer').outerHeight(true);
+  var viewHeight = $(window).innerHeight();
+  var mapHeight = viewHeight - footerHeight - formHeight;
+
+  mapHeight = Math.max(300, mapHeight);
+
+  $('#competitions-map').height(mapHeight);
+}
+
+onPage('competitions#index', function() {
+  resizeMapContainer();
+  $(window).on('resize', resizeMapContainer);
+
+  // Bind all/clear cubing event buttons
+  $('#clear-all-events').on('click', function() {
+    $('#events input[type="checkbox"]').prop('checked', false);
+  });
+  $('#select-all-events').on('click', function() {
+    $('#events input[type="checkbox"]').prop('checked', true);
+  });
+
+  // Ajax searching
+  var $form = $('#competition-query-form');
+  function submitForm() {
+    $form.trigger('submit.rails');
+  }
+
+  $form.on('change', '#events, #region, #state, #display, #status, #delegate, #cancelled, #registration-status', submitForm)
+       .on('click', '#clear-all-events, #select-all-events', submitForm)
+       .on('input', '#search', window.wca.lodashDebounce(submitForm, window.wca.TEXT_INPUT_DEBOUNCE_MS))
+       .on('dp.change','#from_date, #to_date', submitForm);
+
+  $('#competition-query-form').on('ajax:send', function() {
+    $('#loading').show();
+  });
+
+  $('#competition-query-form').on('ajax:complete', function() {
+    $('#loading').hide();
+
+    // Scroll to the top of the form if we are in map mode and screen width is greater than 800px
+    if($('#competitions-map').is(':visible')) {
+      // Switching between list/map/admin uses AJAX to load the map element,
+      // unfortunately it does not trigger our iframe resize trick...
+      // Google maps somehow did make this work, so if you're motivated,
+      // you could look at their source code to try to figure out how they detect and handle this situation.
+      window.wca._competitionsIndexMap.invalidateSize();
+      if ($(window).innerWidth() > 800) {
+        var formTop = $('#competition-query-form').offset().top;
+        $('html, body').animate({ scrollTop: formTop - 5 }, 300);
+      }
+    }
+  });
+
+  // Necessary hack because Safari fires a popstate event on document load
+  $(window).on('load', function() {
+    setTimeout(function() {
+      // When back/forward is clicked the url changes since we use pushState,
+      // but the content is not reloaded so we have to do this manually.
+      $(window).on('popstate', function() {
+        location.reload();
+      });
+    }, 0);
+  });
+});