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 / Requirement
+Highlight mandatory fields that are empty by showing error messages, making it easier for users to identify which required fields need to be completed.
+
+## Solution
+Two client scripts that work together:
+1. **onLoad script**: Shows error messages for empty mandatory fields when form loads
+2. **onChange script**: Updates error messages in real-time as users fill fields
+3. Uses proper ServiceNow methods instead of DOM manipulation
+
+## Implementation
+1. **Create onLoad script**: 
+   - New Client Script, Type: onLoad
+   - Copy code from `script.js`
+   - Apply to desired table
+
+2. **Create onChange script(s)**:
+   - New Client Script, Type: onChange
+   - Copy code from `onChange.js`
+   - **Important**: Replace `'FIELD_NAME'` with actual field name (e.g., 'priority')
+   - Create separate onChange scripts for each mandatory field you want to validate
+   - Set the "Field name" in the client script form to the specific field
+
+## Files
+- `script.js`: onLoad client script for initial highlighting
+- `onChange.js`: onChange template script for real-time updates
+
+## Example Usage
+For priority field onChange script:
+```javascript
+var fieldName = 'priority'; // Replace FIELD_NAME with 'priority'
+```
+
+For category field onChange script:
+```javascript  
+var fieldName = 'category'; // Replace FIELD_NAME with 'category'
+```
+
+## Notes
+- Uses `g_form.showFieldMsg()` and `g_form.hideFieldMsg()` methods
+- Follows ServiceNow best practices (no DOM manipulation)
+- Works with standard ServiceNow forms
+- Create one onChange script per mandatory field for best results

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

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+function onChange(control, oldValue, newValue, isLoading) {
+    if (isLoading) {
+        return;
+    }
+
+    // This onChange script should be applied to specific mandatory fields
+    // Replace 'FIELD_NAME' with the actual field name you want to validate
+    // Example: For priority field, replace with 'priority'
+    var fieldName = 'FIELD_NAME'; // TODO: Replace with actual field name
+
+    if (g_form.isMandatory(fieldName)) {
+        if (!newValue || newValue === '') {
+            // Show error message for empty mandatory field
+            g_form.showFieldMsg(fieldName, 'This field is required', 'error');
+        } else {
+            // Hide error message when field is filled
+            g_form.hideFieldMsg(fieldName);
+        }
+    }
+}

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

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+function onLoad() {
+    // Highlight mandatory fields that are empty using proper ServiceNow methods
+    highlightMandatoryFields();
+
+    function highlightMandatoryFields() {
+        var allFields = g_form.getFieldNames();
+
+        for (var i = 0; i < allFields.length; i++) {
+            var fieldName = allFields[i];
+
+            // Check if field is mandatory and visible
+            if (g_form.isMandatory(fieldName) && g_form.isVisible(fieldName)) {
+                var fieldValue = g_form.getValue(fieldName);
+
+                if (!fieldValue || fieldValue === '') {
+                    // Show warning message for empty mandatory fields
+                    g_form.showFieldMsg(fieldName, 'This field is required', 'error');
+                } else {
+                    // Clear any existing field messages
+                    g_form.hideFieldMsg(fieldName);
+                }
+            }
+        }
+    }
+
+    // Store function globally so onChange scripts can call it
+    window.updateMandatoryHighlighting = highlightMandatoryFields;
+}