Display Info Message of Incident Count of Assigned-To user when Field Assigned-To changes (#2436)

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* Create clientScript.js

* Create glideAjaxIncidentCount.js

Author: zakir8992

Client-Side Components/Client Scripts/Display Incident Count of Assigned-To User When Field Changes/Incident_Count_message_1.png

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+## Display Info Message of Incident Count of Assigned-To User When Field Assigned-To Changes
+
+Displays a message showing the count of **open incidents** assigned to a user whenever the **Assigned To** field changes on the Incident form.  
+
+- Helps assess the assignee’s **current workload** by fetching and displaying active incident counts (excluding *Resolved*, *Closed*, and *Canceled* states)
+- Shows an **info message** with the count of the assignee's assigned incidents
+- Uses an **onChange Client Script** on the **Assigned To** field and a **GlideAjax Script Include** called from the client script to fetch the count dynamically
+
+---
+
+### Info Message Example 1  
+![Incident_Count_message_1](Incident_Count_message_1.png)
+
+### Info Message Example 2  
+![Incident_Count_message_2](Incident_Count_message_2.png)
+
+---

Client-Side Components/Client Scripts/Display Incident Count of Assigned-To User When Field Changes/Incident_Count_message_2.png

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+function onChange(control, oldValue, newValue, isLoading, isTemplate) {
+    if (isLoading || newValue === '') return;
+
+    // Clear any previous messages
+    g_form.clearMessages();
+
+    // Create GlideAjax object to call the Script Include
+    var ga = new GlideAjax('IncidentAssignmentCheck');
+    ga.addParam('sysparm_name', 'getIncidentCount');
+    ga.addParam('sysparm_user', newValue);
+
+    
+    ga.getXMLAnswer(function(response) {
+        var count = parseInt(response, 10);
+
+        
+        if (isNaN(count)) {
+            g_form.addErrorMessage("Could not retrieve open incident count.");
+            return;
+        }
+
+        var userName = g_form.getDisplayValue('assigned_to');
+        var msg = userName + " currently has " + count + " incidents assigned ";
+
+        if (count >= 5) {
+            g_form.addInfoMessage(msg + " Please review workload before assigning more incidents");
+        } else {
+            g_form.addInfoMessage(msg);
+        }
+    });
+}

Client-Side Components/Client Scripts/Display Incident Count of Assigned-To User When Field Changes/README.md

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+var IncidentAssignmentCheck = Class.create();
+IncidentAssignmentCheck.prototype = Object.extendsObject(AbstractAjaxProcessor, {
+
+    getIncidentCount: function() {
+        var user = this.getParameter('sysparm_user');
+        var count = 0;
+
+        if (user) {
+            var gr = new GlideAggregate('incident');
+            gr.addQuery('assigned_to', user);
+            gr.addQuery('state', 'NOT IN', '6,7,8');
+            gr.addAggregate('COUNT');a
+            gr.query();
+
+            if (gr.next()) {
+                count = gr.getAggregate('COUNT');
+            }
+        }
+        return count;
+    },
+
+    type: 'IncidentAssignmentCheck'
+});