1 files changed, 65 insertions, 0 deletions
diff --git a/app/assets/javascripts/feature_highlight/feature_highlight.js b/app/assets/javascripts/feature_highlight/feature_highlight.js
new file mode 100644
index 00000000000..d65cc6d5d7d
--- /dev/null
+++ b/app/assets/javascripts/feature_highlight/feature_highlight.js
@@ -0,0 +1,65 @@
+import _ from 'underscore';
+import {
+  getSelector,
+  togglePopover,
+  inserted,
+  mouseenter,
+  mouseleave,
+} from './feature_highlight_helper';
+
+export function setupFeatureHighlightPopover(id, debounceTimeout = 300) {
+  const $selector = $(getSelector(id));
+  const $parent = $selector.parent();
+  const $popoverContent = $parent.siblings('.feature-highlight-popover-content');
+  const hideOnScroll = togglePopover.bind($selector, false);
+  const debouncedMouseleave = _.debounce(mouseleave, debounceTimeout);
+
+  $selector
+    // Setup popover
+    .data('content', $popoverContent.prop('outerHTML'))
+    .popover({
+      html: true,
+      // Override the existing template to add custom CSS classes
+      template: `
+        <div class="popover feature-highlight-popover" role="tooltip">
+          <div class="arrow"></div>
+          <div class="popover-content"></div>
+        </div>
+      `,
+    })
+    .on('mouseenter', mouseenter)
+    .on('mouseleave', debouncedMouseleave)
+    .on('inserted.bs.popover', inserted)
+    .on('show.bs.popover', () => {
+      window.addEventListener('scroll', hideOnScroll);
+    })
+    .on('hide.bs.popover', () => {
+      window.removeEventListener('scroll', hideOnScroll);
+    })
+    // Display feature highlight
+    .removeAttr('disabled');
+}
+
+export function findHighestPriorityFeature() {
+  let priorityFeature;
+
+  const sortedFeatureEls = [].slice.call(document.querySelectorAll('.js-feature-highlight')).sort((a, b) =>
+    (a.dataset.highlightPriority || 0) < (b.dataset.highlightPriority || 0));
+
+  const [priorityFeatureEl] = sortedFeatureEls;
+  if (priorityFeatureEl) {
+    priorityFeature = priorityFeatureEl.dataset.highlight;
+  }
+
+  return priorityFeature;
+}
+
+export function highlightFeatures() {
+  const priorityFeature = findHighestPriorityFeature();
+
+  if (priorityFeature) {
+    setupFeatureHighlightPopover(priorityFeature);
+  }
+
+  return priorityFeature;
+}