Onchange validation client script based on category, priority and urgency

Client-Side Components/Client Scripts/Onchange Validation Client Script/Readme.md

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+This client script dynamically controls field visibility, auto-calculates priority, 
+and validates user input on the Incident form based on category, impact, and urgency — all without using a Script Include.
+
+it runs whenever the Category field value changes on the form.
+
+1.Validate form fields before saving (example: block submission if “Impact” or “Urgency” is empty).
+2.Auto-calculate “Priority” based on “Impact” and “Urgency.”
+3.Hide or show fields depending on “Category.”
+4.Dynamically filter “Assignment Group” choices based on “Department.”
+
+Uses:
+Runs when Category changes on the Incident form.
+Dynamically shows/hides the Serial Number field.
+Auto-calculates Priority purely on the client side (no server calls).
+Displays inline error messages or alerts based on user input.
+Enforces logic that prevents invalid combinations.

Client-Side Components/Client Scripts/Onchange Validation Client Script/onchange_validation_client_script.js

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+function onChange(control, oldValue, newValue, isLoading, isTemplate) {
+    if (isLoading || newValue === '') {
+        return;
+    }
+
+    // Example: Dynamic behavior when Category changes
+    var category = g_form.getValue('category');
+    var impact = g_form.getValue('impact');
+    var urgency = g_form.getValue('urgency');
+
+    //  Hide or show certain fields dynamically
+    if (category === 'hardware') {
+        g_form.setVisible('u_serial_number', true);
+        g_form.setMandatory('u_serial_number', true);
+    } else {
+        g_form.setVisible('u_serial_number', false);
+        g_form.setMandatory('u_serial_number', false);
+    }
+
+    //  Auto-calculate Priority based on Impact & Urgency
+    // (Client-only logic — no Script Include needed)
+    var priorityMap = {
+        '1_1': '1',
+        '1_2': '2',
+        '1_3': '3',
+        '2_1': '2',
+        '2_2': '3',
+        '2_3': '4',
+        '3_1': '3',
+        '3_2': '4',
+        '3_3': '5'
+    };
+
+    var key = impact + '_' + urgency;
+    var newPriority = priorityMap[key] || '5';
+    g_form.setValue('priority', newPriority);
+
+    //  how a dynamic message when conditions are met
+    if (category === 'hardware' && urgency === '1') {
+        g_form.showFieldMsg('category', 'Critical hardware issue detected! Escalate immediately.', 'error');
+    } else {
+        g_form.hideFieldMsg('category');
+    }
+
+    //  Prevent invalid data combination (client-side validation)
+    if (category === 'software' && impact === '1' && urgency === '1') {
+        alert('High impact & urgency for software incidents require manager approval before submission.');
+        g_form.setValue('state', ''); // Reset state to stop progression
+    }
+}