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* Enhanced Form System
*
* Provides advanced form features:
* - Async validation
* - Custom validators
* - Field transformations
* - Form middleware
*/
/**
* Create an enhanced form with advanced validation and middleware
*
* @param {Object} options - Configuration options
* @param {Object} [options.fields] - Field configurations
* @param {Object} [options.validation] - Validation options
* @param {Array} [options.middleware] - Form middleware functions
* @param {Object} [options.submission] - Submission options
* @returns {Object} Enhanced form instance
*/
export function createForm(options = {}) {
const opts = {
fields: {},
validation: {
strategy: 'blur',
debounce: 300,
async: true,
stopOnFirstError: false,
revalidateOn: ['change', 'blur'],
...options.validation
},
errors: {
format: 'detailed',
display: 'inline',
customFormatter: null,
...options.errors
},
submission: {
preventDefault: true,
validateBeforeSubmit: true,
disableOnSubmit: true,
resetOnSuccess: false,
onSuccess: null,
onError: null,
...options.submission
},
state: {
trackDirty: true,
trackTouched: true,
trackVisited: true,
initialValues: {},
resetValues: null,
...options.state
},
middleware: options.middleware || [],
...options
};
// Form state
const state = {
values: { ...opts.state.initialValues },
errors: {},
touched: {},
dirty: {},
visited: {},
isSubmitting: false,
isValidating: false,
submitCount: 0,
asyncValidations: new Map()
};
// Field metadata
const fields = new Map();
// Statistics
const stats = {
validations: 0,
asyncValidations: 0,
submissions: 0,
successfulSubmissions: 0,
failedSubmissions: 0,
middlewareExecutions: 0
};
/**
* Register a field
*/
function registerField(name, config) {
fields.set(name, {
name,
type: config.type || 'text',
validators: config.validators || [],
transform: config.transform || {},
validateWhen: config.validateWhen,
required: config.required || false,
defaultValue: config.defaultValue,
...config
});
// Initialize field state
if (!(name in state.values)) {
state.values[name] = config.defaultValue !== undefined
? config.defaultValue
: '';
}
state.errors[name] = [];
state.touched[name] = false;
state.dirty[name] = false;
state.visited[name] = false;
}
/**
* Get field configuration
*/
function getField(name) {
return fields.get(name);
}
/**
* Set field value
*/
function setFieldValue(name, value, shouldValidate = true) {
const field = fields.get(name);
if (!field) {
console.warn(`Field ${name} not registered`);
return;
}
// Apply input transformation
if (field.transform?.input) {
value = field.transform.input(value);
}
state.values[name] = value;
// Track dirty state
if (opts.state.trackDirty) {
const initialValue = opts.state.initialValues[name];
state.dirty[name] = value !== initialValue;
}
// Validate if needed
if (shouldValidate && opts.validation.revalidateOn.includes('change')) {
validateField(name);
}
}
/**
* Get field value
*/
function getFieldValue(name) {
return state.values[name];
}
/**
* Set field touched
*/
function setFieldTouched(name, touched = true) {
if (!opts.state.trackTouched) return;
state.touched[name] = touched;
// Validate on blur if configured
if (touched && opts.validation.revalidateOn.includes('blur')) {
validateField(name);
}
}
/**
* Set field visited
*/
function setFieldVisited(name, visited = true) {
if (!opts.state.trackVisited) return;
state.visited[name] = visited;
}
/**
* Validate a single field
*/
async function validateField(name) {
const field = fields.get(name);
if (!field) return { valid: true, errors: [] };
stats.validations++;
// Check conditional validation
if (field.validateWhen && !field.validateWhen(state.values)) {
state.errors[name] = [];
return { valid: true, errors: [] };
}
const value = state.values[name];
const errors = [];
// Cancel previous async validation if any
if (state.asyncValidations.has(name)) {
clearTimeout(state.asyncValidations.get(name));
}
// Required validation
if (field.required && (value === '' || value === null || value === undefined)) {
errors.push({
field: name,
type: 'required',
message: `${name} is required`
});
state.errors[name] = errors;
return { valid: false, errors };
}
// Run validators
for (const validator of field.validators) {
try {
let result;
// Check if validator is async
if (validator.validate.constructor.name === 'AsyncFunction' || opts.validation.async) {
stats.asyncValidations++;
// Debounce async validation
if (validator.debounce || opts.validation.debounce) {
await new Promise(resolve => {
const timeoutId = setTimeout(resolve, validator.debounce || opts.validation.debounce);
state.asyncValidations.set(name, timeoutId);
});
}
result = await validator.validate(value, state.values);
} else {
result = validator.validate(value, state.values);
}
// Check result
if (result !== true && result !== undefined && result !== null) {
errors.push({
field: name,
type: validator.name || 'custom',
message: validator.message || result || 'Validation failed'
});
if (opts.validation.stopOnFirstError) {
break;
}
}
} catch (error) {
errors.push({
field: name,
type: 'error',
message: error.message || 'Validation error'
});
if (opts.validation.stopOnFirstError) {
break;
}
}
}
state.errors[name] = errors;
return { valid: errors.length === 0, errors };
}
/**
* Validate all fields
*/
async function validateForm() {
state.isValidating = true;
const validationPromises = Array.from(fields.keys()).map(name =>
validateField(name)
);
const results = await Promise.all(validationPromises);
state.isValidating = false;
const allErrors = results.reduce((acc, result, index) => {
const fieldName = Array.from(fields.keys())[index];
if (result.errors.length > 0) {
acc[fieldName] = result.errors;
}
return acc;
}, {});
const isValid = Object.keys(allErrors).length === 0;
return {
valid: isValid,
errors: allErrors
};
}
/**
* Execute middleware
*/
async function executeMiddleware(action, data) {
if (opts.middleware.length === 0) return data;
stats.middlewareExecutions++;
let result = data;
for (const middleware of opts.middleware) {
try {
const next = () => result;
result = await middleware(action, result, next, state);
} catch (error) {
console.error('Middleware error:', error);
throw error;
}
}
return result;
}
/**
* Apply field transformations
*/
function applyTransformations(values) {
const transformed = { ...values };
fields.forEach((field, name) => {
if (field.transform?.output && name in transformed) {
transformed[name] = field.transform.output(transformed[name]);
}
});
return transformed;
}
/**
* Submit the form
*/
async function handleSubmit(onSubmit) {
stats.submissions++;
try {
// Prevent default if needed
if (opts.submission.preventDefault && typeof event !== 'undefined') {
event.preventDefault();
}
// Disable form during submission
if (opts.submission.disableOnSubmit) {
state.isSubmitting = true;
}
// Execute beforeSubmit middleware
let values = { ...state.values };
values = await executeMiddleware('beforeSubmit', values);
// Validate before submit
if (opts.submission.validateBeforeSubmit) {
const validation = await validateForm();
if (!validation.valid) {
if (opts.submission.onError) {
opts.submission.onError(validation.errors);
}
stats.failedSubmissions++;
return { success: false, errors: validation.errors };
}
}
// Apply transformations
values = applyTransformations(values);
// Execute afterValidation middleware
values = await executeMiddleware('afterValidation', values);
// Submit
const result = await onSubmit(values);
// Execute afterSubmit middleware
await executeMiddleware('afterSubmit', result);
state.submitCount++;
stats.successfulSubmissions++;
// Reset on success
if (opts.submission.resetOnSuccess) {
reset();
}
if (opts.submission.onSuccess) {
opts.submission.onSuccess(result);
}
return { success: true, data: result };
} catch (error) {
stats.failedSubmissions++;
if (opts.submission.onError) {
opts.submission.onError(error);
}
// Execute onError middleware
await executeMiddleware('onError', error);
return { success: false, error };
} finally {
state.isSubmitting = false;
}
}
/**
* Reset form to initial state
*/
function reset(values) {
const resetValues = values || opts.state.resetValues || opts.state.initialValues;
state.values = { ...resetValues };
state.errors = {};
state.touched = {};
state.dirty = {};
state.visited = {};
state.submitCount = 0;
// Re-initialize field states
fields.forEach((field, name) => {
// Ensure field has a value from resetValues or defaultValue
if (!(name in state.values)) {
state.values[name] = field.defaultValue !== undefined
? field.defaultValue
: '';
}
state.errors[name] = [];
state.touched[name] = false;
state.dirty[name] = false;
state.visited[name] = false;
});
}
/**
* Get form errors
*/
function getErrors(fieldName) {
if (fieldName) {
return state.errors[fieldName] || [];
}
if (opts.errors.customFormatter) {
return opts.errors.customFormatter(state.errors);
}
if (opts.errors.format === 'simple') {
// Return array of error messages
return Object.values(state.errors).flat().map(e => e.message);
}
// Return detailed errors
return state.errors;
}
/**
* Check if form is valid
*/
function isValid() {
return Object.values(state.errors).every(errors => errors.length === 0);
}
/**
* Check if form is dirty
*/
function isDirty(fieldName) {
if (fieldName) {
return state.dirty[fieldName] || false;
}
return Object.values(state.dirty).some(dirty => dirty);
}
/**
* Check if form is touched
*/
function isTouched(fieldName) {
if (fieldName) {
return state.touched[fieldName] || false;
}
return Object.values(state.touched).some(touched => touched);
}
/**
* Get form values
*/
function getValues() {
return { ...state.values };
}
/**
* Set form values
*/
function setValues(values, shouldValidate = false) {
Object.entries(values).forEach(([name, value]) => {
setFieldValue(name, value, shouldValidate);
});
}
/**
* Get form state
*/
function getState() {
return {
values: { ...state.values },
errors: { ...state.errors },
touched: { ...state.touched },
dirty: { ...state.dirty },
visited: { ...state.visited },
isSubmitting: state.isSubmitting,
isValidating: state.isValidating,
submitCount: state.submitCount,
isValid: isValid(),
isDirty: isDirty(),
isTouched: isTouched()
};
}
/**
* Get statistics
*/
function getStats() {
return {
...stats,
fieldsRegistered: fields.size,
activeAsyncValidations: state.asyncValidations.size
};
}
// Register initial fields
Object.entries(opts.fields).forEach(([name, config]) => {
registerField(name, config);
});
return {
registerField,
getField,
setFieldValue,
getFieldValue,
setFieldTouched,
setFieldVisited,
validateField,
validateForm,
handleSubmit,
reset,
getErrors,
isValid,
isDirty,
isTouched,
getValues,
setValues,
getState,
getStats,
// Expose state for testing
_state: state
};
}
// Export built-in validators
export const formValidators = {
required: {
name: 'required',
validate: (value) => {
return value !== '' && value !== null && value !== undefined;
},
message: 'This field is required'
},
email: {
name: 'email',
validate: (value) => {
if (!value) return true;
const regex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
return regex.test(value);
},
message: 'Please enter a valid email address'
},
minLength: (min) => ({
name: 'minLength',
validate: (value) => {
if (!value) return true;
return String(value).length >= min;
},
message: `Must be at least ${min} characters`
}),
maxLength: (max) => ({
name: 'maxLength',
validate: (value) => {
if (!value) return true;
return String(value).length <= max;
},
message: `Must be no more than ${max} characters`
}),
pattern: (regex, message) => ({
name: 'pattern',
validate: (value) => {
if (!value) return true;
return regex.test(value);
},
message: message || 'Invalid format'
}),
asyncEmail: {
name: 'asyncEmail',
validate: async (value) => {
if (!value) return true;
// Simulate async validation (e.g., check if email exists)
await new Promise(resolve => setTimeout(resolve, 100));
const regex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
return regex.test(value);
},
message: 'Please enter a valid email address',
debounce: 500
},
asyncUnique: (checkFn) => ({
name: 'asyncUnique',
validate: async (value) => {
if (!value) return true;
return await checkFn(value);
},
message: 'This value is already taken',
debounce: 500
})
};
// Export default instance
export const enhancedForm = createForm();
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