add client script: shows count of characters remaining in a field

Client-Side Components/Client Scripts/field-character-counter/README.md

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+# Field Character Counter
+
+## Use Case
+Provides real-time character count feedback for text fields in ServiceNow forms. Shows remaining characters with visual indicators to help users stay within field limits.
+
+## Requirements
+- ServiceNow instance
+- Client Script execution rights
+- Text fields with character limits
+
+## Implementation
+1. Create a new Client Script with Type "onChange"
+2. Copy the script code from `script.js`
+3. Configure the field name and character limit in the script
+4. Apply to desired table/form
+5. Save and test
+
+## Configuration
+Edit these variables in the script:
+
+```javascript
+var fieldName = 'short_description';  // Your field name
+var maxLength = 160;                  // Your character limit
+```
+
+## Features
+- Real-time character counting as user types
+- Visual indicators: info (blue), warning (yellow), error (red)
+- Shows "X characters remaining" or "Exceeds limit by X characters"
+- Automatically clears previous messages
+
+## Common Examples
+```javascript
+// Short Description (160 chars)
+var fieldName = 'short_description';
+var maxLength = 160;
+
+// Description (4000 chars)
+var fieldName = 'description';
+var maxLength = 4000;
+
+// Work Notes (4000 chars)
+var fieldName = 'work_notes';
+var maxLength = 4000;
+```
+
+## Message Thresholds
+- **50+ remaining**: Info message (blue)
+- **1-20 remaining**: Warning message (yellow)
+- **Over limit**: Error message (red)
+
+## Notes
+- Uses standard ServiceNow APIs: `g_form.showFieldMsg()` and `g_form.hideFieldMsg()`
+- Create separate Client Scripts for multiple fields
+- Works with all text fields and text areas
+- Character count includes all characters (spaces, punctuation, etc.)

Client-Side Components/Client Scripts/field-character-counter/script.js

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+function onChange(control, oldValue, newValue, isLoading) {
+    if (isLoading) return;
+
+    // USER CONFIGURATION: Set field name and character limit
+    var fieldName = 'Description';  // Change to your field name
+    var maxLength = 80;                  // Change to your character limit
+
+    var currentLength = newValue ? newValue.length : 0;
+    var remaining = maxLength - currentLength;
+
+    // Clear any existing messages
+    g_form.hideFieldMsg(fieldName);
+
+    // Show appropriate message based on remaining characters
+    if (remaining < 0) {
+        g_form.showFieldMsg(fieldName, 'Exceeds limit by ' + Math.abs(remaining) + ' characters', 'error');
+    } else if (remaining <= 20) {
+        g_form.showFieldMsg(fieldName, remaining + ' characters remaining', 'warning');
+    } else if (remaining <= 50) {
+        g_form.showFieldMsg(fieldName, remaining + ' characters remaining', 'info');
+    }
+}