1 files changed, 74 insertions, 0 deletions
diff --git a/app/assets/javascripts/event_tracking.js b/app/assets/javascripts/event_tracking.js
new file mode 100644
index 00000000000..0290e09ad40
--- /dev/null
+++ b/app/assets/javascripts/event_tracking.js
@@ -0,0 +1,74 @@
+import $ from 'jquery';
+
+const extractData = (el, opts = {}) => {
+  const { trackAction, trackLabel = '', trackProperty = '', trackContext } = el.dataset;
+  let trackValue = el.dataset.trackValue || el.value || '';
+  if (el.type === 'checkbox' && !el.checked) trackValue = false;
+  return [
+    trackAction + (opts.suffix || ''),
+    {
+      label: trackLabel,
+      property: trackProperty,
+      value: trackValue,
+      context: trackContext,
+    },
+  ];
+};
+
+export default class EventTracking {
+  static trackable() {
+    return !['1', 'yes'].includes(
+      window.doNotTrack || navigator.doNotTrack || navigator.msDoNotTrack,
+    );
+  }
+
+  static enabled() {
+    return typeof window.snowplow === 'function' && this.trackable();
+  }
+
+  static track(category = document.body.dataset.page, action = 'generic', data = {}) {
+    if (!this.enabled()) return false;
+    // eslint-disable-next-line @gitlab/i18n/no-non-i18n-strings
+    if (!category) throw new Error('Tracking: no category provided for tracking.');
+
+    return window.snowplow(
+      'trackStructEvent',
+      category,
+      action,
+      Object.assign({}, { label: '', property: '', value: '', context: undefined }, data),
+    );
+  }
+
+  constructor(category = document.body.dataset.page) {
+    this.category = category;
+  }
+
+  bind(container = document) {
+    if (!this.constructor.enabled()) return;
+    container.querySelectorAll(`[data-track-action]`).forEach(el => {
+      if (this.customHandlingFor(el)) return;
+      // jquery is required for select2, so we use it always
+      // see: https://github.com/select2/select2/issues/4686
+      $(el).on('click', this.eventHandler(this.category));
+    });
+  }
+
+  customHandlingFor(el) {
+    const classes = el.classList;
+
+    // bootstrap dropdowns
+    if (classes.contains('dropdown')) {
+      $(el).on('show.bs.dropdown', this.eventHandler(this.category, { suffix: '_show' }));
+      $(el).on('hide.bs.dropdown', this.eventHandler(this.category, { suffix: '_hide' }));
+      return true;
+    }
+
+    return false;
+  }
+
+  eventHandler(category = null, opts = {}) {
+    return e => {
+      this.constructor.track(category || this.category, ...extractData(e.currentTarget, opts));
+    };
+  }
+}