Automatically Populate Watch List When Assigned-To Changes

Client-Side Components/Client Scripts/Auto populate watchlist/README.md

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+## Automatically Populate Watch List When Assigned-To Changes
+
+When the **Assigned To** field changes, this client script updates the **Watch list** to include the **Opened By**, **previous assignees**, and **new assignee**.  
+- Help maintains visibility of all users involved on incident record.  
+- Helps track assigned-to transitions and ensures clarity during assignment change.  
+- A confirmation message appears when the change is reflected in the Watch list.  
+- Specific script for use in the Incident record form in ServiceNow but can be used for other record forms too.
+---
+
+![Auto populate watchlist](./Screenshot_clientscript_autopopulate_watchlist.png)
+
+---

Client-Side Components/Client Scripts/Auto populate watchlist/script.js

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+function onChange(control, oldValue, newValue, isLoading, isTemplate) {
+    if (isLoading) return;
+
+    // Get existing watch list first
+    var existing = g_form.getValue('watch_list');
+    var watchList = existing ? existing.split(',') : [];
+
+    // Get key values
+    var openedBy = g_form.getValue('opened_by');
+    var prevAssigned = oldValue;
+    var newAssigned = newValue;
+
+    if (!openedBy) {
+        openedBy = g_user.userID; // current logged-in user
+    }
+
+    // Add new users if not already present
+    if (openedBy) watchList.push(openedBy);
+    if (prevAssigned) watchList.push(prevAssigned);
+    if (newAssigned) watchList.push(newAssigned);
+
+    // Remove duplicates
+    var uniqueList = [];
+    for (var i = 0; i < watchList.length; i++) {
+        var val = watchList[i];
+        if (val && uniqueList.indexOf(val) === -1) {
+            uniqueList.push(val);
+        }
+    }
+
+    // Update watch list
+    g_form.setValue('watch_list', uniqueList.join(','));
+
+    // Display confirmation message
+    g_form.addInfoMessage(" Your Assigned To change is reflected and added in Watch list");
+}