Fix multiple link click events tracked for a single tracker in case multiple trackers are initialized on the page (close #1384)

PR #1385

Author: matus-tomlein

common/changes/@snowplow/browser-plugin-link-click-tracking/issue-1384-link_click_fix_2024-11-20-11-36.json

@@ -0,0 +1,10 @@
+{
+  "changes": [
+    {
+      "packageName": "@snowplow/browser-plugin-link-click-tracking",
+      "comment": "Fix multiple link click events tracked for a single tracker in case multiple trackers are initialized on the page (#1384)",
+      "type": "none"
+    }
+  ],
+  "packageName": "@snowplow/browser-plugin-link-click-tracking"
+}

plugins/browser-plugin-link-click-tracking/src/index.ts

@@ -274,10 +274,13 @@ function clickHandler(tracker: string, evt: MouseEvent | undefined): void {
 
   // Using evt.type (added in IE4), we avoid defining separate handlers for mouseup and mousedown.
   if (event.type === 'click') {
-    trackLinkClick({
-      element: target,
-      context: resolveDynamicContext(context, target),
-    });
+    trackLinkClick(
+      {
+        element: target,
+        context: resolveDynamicContext(context, target),
+      },
+      [tracker]
+    );
   } else if (event.type === 'mousedown') {
     if (button === 1 || button === 2) {
       _configuration[tracker].lastButton = button;
@@ -287,10 +290,13 @@ function clickHandler(tracker: string, evt: MouseEvent | undefined): void {
     }
   } else if (event.type === 'mouseup') {
     if (button === _configuration[tracker].lastButton && target === _configuration[tracker].lastTarget) {
-      trackLinkClick({
-        element: target,
-        context: resolveDynamicContext(context, target),
-      });
+      trackLinkClick(
+        {
+          element: target,
+          context: resolveDynamicContext(context, target),
+        },
+        [tracker]
+      );
     }
     delete _configuration[tracker].lastButton;
     delete _configuration[tracker].lastTarget;

plugins/browser-plugin-link-click-tracking/test/events.test.ts

@@ -342,6 +342,26 @@ describe('LinkClickTrackingPlugin', () => {
 
       expect(await eventStore.getAllPayloads()).toHaveLength(1);
     });
+
+    it('tracks a single link click with each tracker', async () => {
+      addTracker('sp2', 'sp2', 'js-3.0.0', '', new SharedState(), {
+        stateStorageStrategy: 'cookie',
+        encodeBase64: false,
+        plugins: [LinkClickTrackingPlugin()],
+        eventStore,
+        customFetch: async () => new Response(null, { status: 500 }),
+      });
+
+      enableLinkClickTracking();
+
+      const target = document.createElement('a');
+      target.href = 'https://www.example.com/exists';
+      document.body.appendChild(target);
+
+      target.click();
+
+      expect(await eventStore.getAllPayloads()).toHaveLength(2);
+    });
   });
 
   describe('disableLinkClickTracking', () => {
@@ -351,7 +371,7 @@ describe('LinkClickTrackingPlugin', () => {
 
       const addCalls = $addEventListener.mock.calls;
 
-      expect(addCalls).toHaveLength(1);
+      expect(addCalls).toHaveLength(2);
       expect($removeEventListener.mock.calls).toContainEqual(addCalls[0]);
     });
   });