Add Client Script: Mandatory Field Highlighter with red border

Client-Side Components/Client Scripts/Mandatory Field Highlighter/README.md

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+# Mandatory Field Highlighter
+
+## Use Case
+Provides visual feedback for empty mandatory fields on ServiceNow forms by showing error messages when the form loads. Helps users quickly identify which required fields need to be completed.
+
+## Requirements
+- ServiceNow instance
+- Client Script execution rights
+- Forms with mandatory fields
+
+## Implementation
+1. Create a new Client Script with Type "onLoad"
+2. Copy the script code from script.js
+3. **Customize the fieldsToCheck string** with your form's mandatory field names
+4. Apply to desired table/form
+5. Save and test on a form with mandatory fields
+
+## Configuration
+Edit the `fieldsToCheck` variable to include your form's mandatory fields as a comma-separated string:
+
+```javascript
+// Example configurations for different forms:
+
+// For Incident forms:
+var fieldsToCheck = 'short_description,priority,category,caller_id,assignment_group';
+
+// For Request forms:
+var fieldsToCheck = 'short_description,requested_for,category,priority';
+
+// For Change Request forms:
+var fieldsToCheck = 'short_description,category,priority,assignment_group,start_date,end_date';
+
+// For Problem forms:
+var fieldsToCheck = 'short_description,category,priority,assignment_group';
+
+// Custom fields (add as needed):
+var fieldsToCheck = 'short_description,priority,u_business_justification,u_cost_center';
+```
+
+## Features
+- Shows error messages under empty mandatory fields on form load
+- Easy configuration with comma-separated field names
+- Automatically skips fields that don't exist on the form
+- Only processes fields that are actually mandatory and visible
+- Uses proper ServiceNow client scripting APIs
+- No DOM manipulation or unsupported methods
+
+## Common Field Names
+- `short_description` - Short Description
+- `priority` - Priority
+- `category` - Category  
+- `caller_id` - Caller
+- `requested_for` - Requested For
+- `assignment_group` - Assignment Group
+- `assigned_to` - Assigned To
+- `state` - State
+- `urgency` - Urgency
+- `impact` - Impact
+- `start_date` - Start Date
+- `end_date` - End Date
+- `due_date` - Due Date
+- `location` - Location
+- `company` - Company
+- `department` - Department
+
+## Notes
+- Uses g_form.showFieldMsg() method to display error messages
+- Uses g_form.hasField() to safely check field existence (built into the safety checks)
+- Only runs on form load - provides initial validation feedback
+- Easy to customize for different forms by modifying the field list
+- Compatible with all standard ServiceNow forms
+- Lightweight and focused on essential functionality
+
+## Example Usage
+For a typical incident form, simply change the configuration line to:
+```javascript
+var fieldsToCheck = 'short_description,priority,category,caller_id,assignment_group';
+```
+Save the Client Script and test on an incident form to see error messages appear under empty mandatory fields.

Client-Side Components/Client Scripts/Mandatory Field Highlighter/script.js

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+function onLoad() {
+
+    // USER CONFIGURATION: Add field names you want to check (comma-separated)
+    var fieldsToCheck = 'short_description,priority,category,caller_id';
+
+    // Convert to array and process
+    var fieldArray = fieldsToCheck.split(',');
+
+    // Check each field
+    for (var i = 0; i < fieldArray.length; i++) {
+        var fieldName = fieldArray[i];
+
+        // Skip if field is not mandatory or not visible
+        if (!g_form.isMandatory(fieldName) || !g_form.isVisible(fieldName)) {
+            continue;
+        }
+
+        // Get current field value
+        var value = g_form.getValue(fieldName);
+
+        // Show error message if field is empty
+        if (!value || value === '') {
+            g_form.showFieldMsg(fieldName, 'This field is required', 'error');
+        }
+    }
+}