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* Coherent.js Forms - Validators
*
* Form validation utilities
*
* @module forms/validators
*/
/**
* Built-in validators with signature: (value, options, translator, allValues) => errorMessage | null
*/
export const validators = {
required: (value, options = {}) => {
if (value === null || value === undefined || value === '') {
return options.message || validators.required.message || 'This field is required';
}
return null;
},
email: (value) => {
if (!value) return null;
const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
if (!emailRegex.test(value)) {
return 'Please enter a valid email address';
}
return null;
},
minLength: (value, options = {}) => {
Iif (!value) return null;
const min = options.min || 0;
if (value.length < min) {
return options.message || `Must be at least ${min} characters`;
}
return null;
},
maxLength: (value, options = {}) => {
Iif (!value) return null;
const max = options.max || Infinity;
if (value.length > max) {
return options.message || `Must be no more than ${max} characters`;
}
return null;
},
min: (value, options = {}) => {
Iif (value === null || value === undefined || value === '') return null;
const num = Number(value);
const minValue = options.min || 0;
if (isNaN(num) || num < minValue) {
return options.message || `Must be at least ${minValue}`;
}
return null;
},
max: (value, options = {}) => {
Iif (value === null || value === undefined || value === '') return null;
const num = Number(value);
const maxValue = options.max || Infinity;
if (isNaN(num) || num > maxValue) {
return options.message || `Must be no more than ${maxValue}`;
}
return null;
},
pattern: (value, options = {}) => {
Iif (!value) return null;
const regex = options.pattern || options.regex;
if (regex && !regex.test(value)) {
return options.message || 'Invalid format';
}
return null;
},
url: (value) => {
Iif (!value) return null;
try {
new URL(value);
return null;
} catch {
return 'Please enter a valid URL';
}
},
number: (value) => {
Iif (value === null || value === undefined || value === '') return null;
if (isNaN(Number(value))) {
return 'Must be a valid number';
}
return null;
},
integer: (value) => {
Iif (value === null || value === undefined || value === '') return null;
const num = Number(value);
if (isNaN(num) || !Number.isInteger(num)) {
return 'Must be a whole number';
}
return null;
},
phone: (value) => {
if (!value) return null;
const phoneRegex = /^[\d\s\-\+\(\)]+$/;
if (!phoneRegex.test(value) || value.replace(/\D/g, '').length < 10) {
return 'Please enter a valid phone number';
}
return null;
},
date: (value) => {
if (!value) return null;
const date = new Date(value);
if (isNaN(date.getTime())) {
return 'Please enter a valid date';
}
return null;
},
match: (value, options = {}, translator, allValues = {}) => {
if (!value) return null;
const fieldName = options.field || options.fieldName;
if (value !== allValues[fieldName]) {
return options.message || `Must match ${fieldName}`;
}
return null;
},
custom: (value, options = {}, translator, allValues) => {
const validatorFn = options.validator || options.fn;
if (!validatorFn) return null;
const isValid = validatorFn(value, allValues);
return isValid ? null : (options.message || 'Validation failed');
},
fileType: (value, options = {}) => {
Iif (!value) return null;
const allowedTypes = options.accept || options.types || [];
// Handle File object
Eif (value.type !== undefined) {
const fileType = value.type;
const fileExt = value.name ? value.name.split('.').pop().toLowerCase() : '';
// Check MIME type or extension
const isValid = allowedTypes.some(type => {
Iif (type.startsWith('.')) {
return fileExt === type.slice(1).toLowerCase();
}
Eif (type.includes('/')) {
Eif (type.endsWith('/*')) {
return fileType.startsWith(type.replace('/*', '/'));
}
return fileType === type;
}
return fileExt === type.toLowerCase();
});
if (!isValid) {
return options.message || `File type must be one of: ${allowedTypes.join(', ')}`;
}
return null;
}
return null;
},
fileSize: (value, options = {}) => {
Iif (!value) return null;
const maxSize = options.maxSize || Infinity;
// Handle File object
Eif (value.size !== undefined) {
if (value.size > maxSize) {
const maxSizeMB = (maxSize / (1024 * 1024)).toFixed(2);
return options.message || `File size must be less than ${maxSizeMB}MB`;
}
return null;
}
return null;
},
fileExtension: (value, options = {}) => {
Iif (!value) return null;
const allowedExtensions = options.extensions || [];
const fileName = value.name || value;
const ext = `.${ fileName.split('.').pop().toLowerCase()}`;
const isValid = allowedExtensions.some(allowed => {
return ext === allowed.toLowerCase();
});
if (!isValid) {
return options.message || `File extension must be one of: ${allowedExtensions.join(', ')}`;
}
return null;
},
alpha: (value) => {
Iif (!value) return null;
const alphaRegex = /^[a-zA-Z]+$/;
if (!alphaRegex.test(value)) {
return 'Must contain only letters';
}
return null;
},
alphanumeric: (value) => {
Iif (!value) return null;
const alphanumericRegex = /^[a-zA-Z0-9]+$/;
if (!alphanumericRegex.test(value)) {
return 'Must contain only letters and numbers';
}
return null;
},
uppercase: (value) => {
if (!value) return null;
if (value !== value.toUpperCase()) {
return 'Must be uppercase';
}
return null;
},
// Get a registered validator
get: (name) => {
return validators[name];
},
// Compose multiple validators
compose: (validatorList) => {
return (value, options, translator, allValues) => {
for (const validator of validatorList) {
const error = typeof validator === 'function'
? validator(value, options, translator, allValues)
: null;
if (error) {
return error;
}
}
return null;
};
},
// Debounce async validator
debounce: (validator, delay = 300) => {
let timeoutId;
return (value) => {
return new Promise((resolve) => {
clearTimeout(timeoutId);
timeoutId = setTimeout(async () => {
const result = await validator(value);
resolve(result);
}, delay);
});
};
},
// Cancellable async validator
cancellable: (validator) => {
let abortController;
const wrapped = async (value) => {
Iif (abortController) {
abortController.abort();
}
// AbortController is a global browser/Node.js API
abortController = typeof AbortController !== 'undefined' ? new AbortController() : null;
try {
return await validator(value, abortController ? abortController.signal : null);
} catch (error) {
Iif (error.name === 'AbortError') {
return null;
}
throw error;
}
};
wrapped.cancel = () => {
Eif (abortController) {
abortController.abort();
}
};
return wrapped;
},
// Conditional validator
when: (condition, validator) => {
return (value, options = {}, translator, allValues = {}) => {
// Pass options as context if it looks like context (has non-validator properties)
const context = options.min !== undefined || options.max !== undefined ? allValues : options;
const shouldValidate = typeof condition === 'function'
? condition(value, context)
: condition;
if (!shouldValidate) {
return null;
}
return typeof validator === 'function'
? validator(value, options, translator, allValues)
: null;
};
},
// Validator chain builder
chain: (options = {}) => {
const validatorList = [];
const stopOnFirstError = options.stopOnFirstError !== false;
const chain = {
required: (opts) => {
validatorList.push((v, o, t, a) => validators.required(v, opts || o, t, a));
return chain;
},
email: (opts) => {
validatorList.push((v, o, t, a) => validators.email(v, opts || o, t, a));
return chain;
},
minLength: (opts) => {
validatorList.push((v, o, t, a) => validators.minLength(v, opts || o, t, a));
return chain;
},
maxLength: (opts) => {
validatorList.push((v, o, t, a) => validators.maxLength(v, opts || o, t, a));
return chain;
},
custom: (fn, message) => {
validatorList.push((v, o, t, a) => {
// Custom validator returns null if valid, message if invalid
const result = fn(v, a);
return result === null || result === true || result === undefined ? null : (message || result);
});
return chain;
},
validate: (value, opts, translator, allValues) => {
if (stopOnFirstError) {
// Stop on first error - return single error or null
for (const validator of validatorList) {
const error = validator(value, opts, translator, allValues);
if (error) {
return error;
}
}
return null;
} else {
// Collect all errors - return array or null
const errors = [];
for (const validator of validatorList) {
const error = validator(value, opts, translator, allValues);
Eif (error) {
errors.push(error);
}
}
return errors.length > 0 ? errors : null;
}
}
};
return chain;
}
};
/**
* Validate a single field
*/
export function validateField(value, validatorList, formData = {}) {
for (const validator of validatorList) {
const error = validator(value, formData);
if (error) {
return error;
}
}
return null;
}
/**
* Validate entire form
*/
export function validateForm(formData, fieldValidators) {
const errors = {};
for (const [fieldName, validatorList] of Object.entries(fieldValidators)) {
const value = formData[fieldName];
const error = validateField(value, validatorList, formData);
if (error) {
errors[fieldName] = error;
}
}
return Object.keys(errors).length > 0 ? errors : null;
}
/**
* Create a validator
*/
export function createValidator(validatorFn, message) {
return (value, options, translator, allValues) => {
const result = validatorFn(value, options, translator, allValues);
// If validator returns a string, use it as the error message
if (typeof result === 'string') {
return result;
}
// If validator returns falsy (null, false, undefined), no error
Eif (!result) {
return null;
}
// If validator returns truthy (true, object, etc), use provided message
return message || 'Validation failed';
};
}
/**
* Register a custom validator
*/
export function registerValidator(name, validatorFn) {
validators[name] = validatorFn;
}
/**
* Compose multiple validators
*/
export function composeValidators(...validatorFns) {
return (value, options, translator, allValues) => {
for (const validator of validatorFns) {
const error = validator(value, options, translator, allValues);
if (error) {
return error;
}
}
return null;
};
}
export default {
validators,
validateField,
validateForm,
createValidator,
registerValidator,
composeValidators
};
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