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Smart Form Validation
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# Smart Form Validation for Catalog Items
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This snippet provides intelligent form validation functionality for ServiceNow Catalog Items with real-time feedback and custom validation rules.
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## Overview
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The feature includes two implementations:
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1. Basic Implementation (`basic_implementation.js`)
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2. Advanced Implementation (`advanced_implementation.js`)
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## Basic Implementation
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### Features
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- Real-time field validation
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- Common validation rules (email, phone, number, date)
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- Field-specific error messages
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- Form-level validation
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### Usage
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```javascript
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// Apply in Catalog Client Script
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// Select both "onChange" and "onSubmit" for "Client script runs"
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// Copy content from basic_implementation.js
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```
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## Advanced Implementation
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### Enhanced Features
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- All basic features
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- Custom validation rules
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- Field dependencies
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- Validation history (undo/redo support)
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- Validation summary dialog
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- Working hours validation
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- Password strength checking
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- Future date validation
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### Usage
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```javascript
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// Apply in Catalog Client Script
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// Select both "onChange" and "onSubmit" for "Client script runs"
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// Copy content from advanced_implementation.js
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```
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## Technical Details
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### Dependencies
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- ServiceNow Platform UI Framework
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- GlideForm API
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- GlideModal (advanced implementation)
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### Validation Rules
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1. Basic Rules:
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- Email validation
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- Phone number format
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- Numeric values
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- Date format
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2. Advanced Rules:
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- Password strength
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- Future dates
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- Working hours
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- Custom dependencies
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## Implementation Guide
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1. Create a new Catalog Client Script:
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- Table: Catalog Client Script [catalog_script_client]
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- Type: Both onChange and onSubmit
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- Active: true
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2. Choose implementation:
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- For basic needs: Copy `basic_implementation.js`
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- For advanced features: Copy `advanced_implementation.js`
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3. Configure Rules:
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- Modify existing rules
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- Add custom validation rules
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- Set up field dependencies
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## Best Practices
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1. Performance:
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- Use appropriate validation timing
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- Cache validation results
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- Optimize regular expressions
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2. User Experience:
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- Clear error messages
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- Immediate feedback
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- Helpful validation summaries
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3. Maintenance:
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- Document custom rules
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- Keep validation logic organized
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- Regular expression testing
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## Limitations
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- Browser compatibility considerations
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- Form field type restrictions
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- Performance with many fields
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## Troubleshooting
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Common issues and solutions:
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1. Validation not triggering
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- Check event handlers
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- Verify field types
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- Console for errors
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2. Custom rules not working
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- Validate rule syntax
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- Check field values
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- Test regular expressions
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## Version Information
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- Compatible with ServiceNow: Rome and later
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- Browser Requirements: Modern browsers
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- Last Updated: October 2025
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/**
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* Smart Form Validation
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* Comprehensive form validation with custom rules and real-time feedback
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*/
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function onChange(control, oldValue, newValue, isLoading) {
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if (isLoading || newValue === '') {
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return;
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}
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var validator = new SmartFormValidator();
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validator.validateField(control, newValue);
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}
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function onSubmit() {
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var validator = new SmartFormValidator();
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return validator.validateForm();
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}
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var SmartFormValidator = Class.create();
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SmartFormValidator.prototype = {
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initialize: function() {
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// Validation rules with regex patterns and custom functions
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this.rules = {
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// Basic field types
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email: {
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pattern: /^[^\s@]+@[^\s@]+\.[^\s@]+$/,
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message: 'Please enter a valid email address'
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},
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phone: {
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pattern: /^\+?[\d\s-]{10,}$/,
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message: 'Please enter a valid phone number'
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},
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number: {
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pattern: /^\d+$/,
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message: 'Please enter a valid number'
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},
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date: {
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validate: function(value) {
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var date = new Date(value);
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return !isNaN(date.getTime());
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},
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message: 'Please enter a valid date'
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},
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// Special validations
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password: {
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validate: function(value) {
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return /^(?=.*[A-Za-z])(?=.*\d)(?=.*[@$!%*#?&])[A-Za-z\d@$!%*#?&]{8,}$/.test(value);
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},
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message: 'Password must contain at least 8 characters, one letter, one number, and one special character'
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},
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futureDate: {
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validate: function(value) {
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var date = new Date(value);
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return date > new Date();
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},
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message: 'Date must be in the future'
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},
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workingHours: {
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validate: function(value) {
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var time = value.split(':');
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var hour = parseInt(time[0]);
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return hour >= 9 && hour < 17;
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},
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message: 'Time must be between 9 AM and 5 PM'
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}
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};
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// Field dependencies storage
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this.dependencies = {};
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},
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// Add a dependency between fields
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addDependency: function(field, dependentField, validationFunc) {
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if (!this.dependencies[field]) {
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this.dependencies[field] = [];
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}
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this.dependencies[field].push({
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field: dependentField,
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validate: validationFunc
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});
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},
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// Validate dependencies for a field
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validateDependencies: function(field) {
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if (this.dependencies[field]) {
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this.dependencies[field].forEach(function(dep) {
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var dependentValue = g_form.getValue(dep.field);
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var isValid = dep.validate(dependentValue);
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if (!isValid) {
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g_form.showFieldMsg(dep.field, 'This field depends on ' + field, 'warning');
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}
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});
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}
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},
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// Validate a single field
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validateField: function(control, value) {
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var fieldType = this._getFieldValidationType(control);
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var rule = this.rules[fieldType];
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if (rule) {
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var isValid = rule.pattern ?
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rule.pattern.test(value) :
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rule.validate(value);
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if (!isValid) {
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g_form.showFieldMsg(control, rule.message, 'error');
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return false;
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}
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// Check field dependencies
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this.validateDependencies(control);
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g_form.hideFieldMsg(control);
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return true;
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}
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return true;
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},
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// Validate entire form
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validateForm: function() {
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var isValid = true;
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var fields = g_form.getFields();
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var invalidFields = [];
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fields.forEach(function(field) {
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var fieldName = field.getName();
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var value = g_form.getValue(fieldName);
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if (!this.validateField(fieldName, value)) {
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isValid = false;
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invalidFields.push(fieldName);
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}
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}, this);
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if (!isValid) {
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this._showValidationSummary(invalidFields);
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}
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return isValid;
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},
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// Determine validation type for a field
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_getFieldValidationType: function(fieldName) {
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var field = g_form.getField(fieldName);
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var type = field.getType();
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// Check for special validation rules
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var validationType = g_form.getValue(fieldName + '_validation_type');
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if (validationType && this.rules[validationType]) {
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return validationType;
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}
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// Map field types to validation rules
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switch(type) {
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case 'email':
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return 'email';
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case 'phone':
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return 'phone';
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case 'integer':
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case 'decimal':
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return 'number';
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case 'date':
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return 'date';
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default:
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return null;
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}
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},
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// Show validation summary dialog
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_showValidationSummary: function(invalidFields) {
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var dialog = new GlideModal('validation_summary');
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dialog.setTitle('Form Validation Errors');
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var html = '<div class="validation-summary">';
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html += '<p>Please correct the following fields:</p>';
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html += '<ul>';
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invalidFields.forEach(function(fieldName) {
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var label = g_form.getLabel(fieldName);
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html += '<li>' + label + '</li>';
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});
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html += '</ul></div>';
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dialog.renderWithContent(html);
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},
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type: 'SmartFormValidator'
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};

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