react-minimalistic-use-form
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Minimalistic react hook for handling forms without much pain.
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JavaScript
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import { useRef, useEffect, useCallback, useMemo, useReducer, } from 'react';
import { getDefaultDateValue } from '../utils/getDefaultDateValue';
import { getInitialState, reducer } from './state';
import { eventTypes, htmlAttributes, htmlInputTypes, STATE_ACTIONS, } from './enums';
import { validatePlugins } from '../utils/validatePlugins';
import { useIsUpdated } from '../hooks/is-updated';
var TOUCHED_CLASS_NAME = 'is-touched';
var ERROR_CLASS_NAME = 'has-error';
var ELEMENT_TAG_NAME_SELECT = 'SELECT';
var CHECKBOX_DEFAULT_VALUE = 'on';
var supportedFormElements = [
'text',
'email',
'password',
'checkbox',
'radio',
'number',
'textarea',
'date',
'tel',
'search',
'url',
'color',
];
var validityDefaultErrorMessages = {
badInput: function () { return 'Invalid input'; },
patternMismatch: function (_a) {
var pattern = _a.pattern;
return "Please match the format requested : \"".concat(pattern, "\"");
},
rangeOverflow: function (_a) {
var value = _a.value;
return "Value must be less than or equal to ".concat(value, ".");
},
rangeUnderflow: function (_a) {
var value = _a.value;
return "Value must be greater than or equal to ".concat(value, ".");
},
stepMismatch: function (_a) {
var step = _a.step;
return "Please enter a valid value. Number must have step of ".concat(step);
},
tooLong: function (_a) {
var maxLength = _a.maxLength, value = _a.value;
return "Please lengthen this text to ".concat(maxLength, " characters or less (you are currently using ").concat(value, " character).");
},
tooShort: function (_a) {
var minLength = _a.minLength, value = _a.value;
return "Please lengthen this text to ".concat(minLength, " characters or more (you are currently using ").concat(value, " character).");
},
typeMismatch: function (_a) {
var type = _a.type;
return "Type mismatch. Must be type of \"".concat(type, "\".");
},
valueMissing: function () { return 'Please fill in this field.'; },
};
/**
*
* This function is used on <resetForm>. The function updates the field value natively with initialValue
* provided either via initialValues or custom one in case of custom controlled input.
* Since Events (change | click) must be fired manually in order to call event handlers
* of parent component that controls the input we have to update value via setter function
* which will be picked up by input event handler attached as element attribute callback
*
* Why? Because React tracks when you set the value property on an input to keep track of the node's value.
* When you dispatch a change event, it checks it's last value against the current value
* (https://github.com/facebook/react/blob/dd5fad29616f706f484938663e93aaadd2a5e594/packages/react-dom/src/client/inputValueTracking.js#L129)
* and if they're the same it does not call any event handlers (as no change has taken place as far as react is concerned).
* So we have to set the value in a way that React's value setter function
* (https://github.com/facebook/react/blob/dd5fad29616f706f484938663e93aaadd2a5e594/packages/react-dom/src/client/inputValueTracking.js#L78-L81)
* will not be called, which is where the setNativeValue comes into play.
* This function was a team effort: https://github.com/facebook/react/issues/10135#issuecomment-401496776
* @param {Node} element
* @param {String} attributeToUpdate
* @param {String | Boolean} value
*/
export var setNativeValue = function (_a) {
var element = _a.element, _b = _a.attributeToUpdate, attributeToUpdate = _b === void 0 ? htmlAttributes.value : _b, _c = _a.value, value = _c === void 0 ? '' : _c;
var valueSetter = (Object.getOwnPropertyDescriptor(element, attributeToUpdate) || {}).set;
var prototype = Object.getPrototypeOf(element);
var prototypeValueSetter = (Object.getOwnPropertyDescriptor(prototype, attributeToUpdate) || {}).set;
if (prototypeValueSetter && valueSetter !== prototypeValueSetter) {
prototypeValueSetter.call(element, value);
}
else if (valueSetter) {
valueSetter.call(element, value);
}
else {
throw new Error('The given element does not have a value setter');
}
};
export var useForm = function (_a) {
var _b = _a === void 0 ? {} : _a, _c = _b.initialValues, initialValues = _c === void 0 ? {} : _c, _d = _b.errorClassName, errorClassName = _d === void 0 ? ERROR_CLASS_NAME : _d, _e = _b.touchedClassName, touchedClassName = _e === void 0 ? TOUCHED_CLASS_NAME : _e, _f = _b.scrollToError, scrollToError = _f === void 0 ? false : _f, scrollToErrorOptions = _b.scrollToErrorOptions, _g = _b.validateOnInput, validateOnInput = _g === void 0 ? true : _g, _h = _b.validateOnSubmit, validateOnSubmit = _h === void 0 ? false : _h, _j = _b.validateOnMount, validateOnMount = _j === void 0 ? false : _j, _k = _b.debounceValidation, debounceValidation = _k === void 0 ? false : _k, _l = _b.debounceTime, debounceTime = _l === void 0 ? 300 : _l, _m = _b.plugins, plugins = _m === void 0 ? {} : _m;
var _o = __read(useReducer(reducer, getInitialState(initialValues)), 2), state = _o[0], dispatch = _o[1];
var formRef = useRef(null);
var touchedRef = useRef({});
var validatorDebounceTimeout = useRef(undefined);
var throwFormRefError = function () {
throw new Error('formRef is empty! useForm "formRef" needs to be attached to form element');
};
var getFormElements = useCallback(function (form) {
if (form === null || form === undefined) {
return throwFormRefError();
}
var formElements = form.elements;
return __spreadArray([], __read(formElements), false).filter(function (element) { return supportedFormElements.includes(element.type) || element.tagName === ELEMENT_TAG_NAME_SELECT; });
}, []);
/**
* Method runs on each change of state.errors to properly update "isFormValid".
*/
var updateIsFormValid = useCallback(function () {
var formElements = getFormElements(formRef.current);
var allValidityValid = formElements.every(function (element) { return element.validity.valid; });
var noErrors = Object.values(state.errors).every(function (fieldErrors) { return Object.keys(fieldErrors).length === 0; });
var isFormValid = allValidityValid && noErrors;
dispatch({ type: STATE_ACTIONS.SET_IS_FORM_VALID, payload: { isFormValid: isFormValid } });
return isFormValid;
}, [getFormElements, state.errors]);
var _scrollToError = useCallback(function (element) { return __awaiter(void 0, void 0, void 0, function () {
var inputLabel, elementToScrollInto;
var _a;
return __generator(this, function (_b) {
switch (_b.label) {
case 0:
inputLabel = (_a = element === null || element === void 0 ? void 0 : element.closest('label')) !== null && _a !== void 0 ? _a : document.querySelector("label[for=\"".concat(element.name, "\""));
elementToScrollInto = inputLabel !== null && inputLabel !== void 0 ? inputLabel : element;
if (!((plugins === null || plugins === void 0 ? void 0 : plugins.scrollToError) !== undefined)) return [3 /*break*/, 2];
return [4 /*yield*/, plugins.scrollToError(elementToScrollInto)];
case 1:
_b.sent();
return [2 /*return*/];
case 2:
elementToScrollInto.scrollIntoView(scrollToErrorOptions);
return [2 /*return*/];
}
});
}); }, [plugins, scrollToErrorOptions]);
var setFieldErrorClassName = useCallback(function (_a) {
var classList = _a.classList;
classList.add(errorClassName);
}, [errorClassName]);
var unsetFieldErrorClassName = useCallback(function (_a) {
var classList = _a.classList;
classList.remove(errorClassName);
}, [errorClassName]);
/**
* Set error class name and update the state
*/
var setFieldErrors = useCallback(function (_a) {
var element = _a.element, errors = _a.errors;
var name = element.name;
dispatch({ type: STATE_ACTIONS.SET_FIELD_ERRORS, payload: { name: name, errors: errors } });
}, []);
/**
* Unset error classname and update the state
*/
var unsetFieldErrors = useCallback(function (element) {
var name = element.name;
dispatch({ type: STATE_ACTIONS.SET_FIELD_ERRORS, payload: { name: name, errors: {} } });
}, []);
/**
* Check element html validity and return an object with errors
*/
var getFieldValidityErrors = useCallback(function (element) {
var _a;
var elementErrors = {};
if (!((_a = element.validity) === null || _a === void 0 ? void 0 : _a.valid)) {
for (var validityName in element.validity) {
// @ts-ignore
if (validityDefaultErrorMessages.hasOwnProperty(validityName) === true && element.validity[validityName] === true) { // eslint-disable-line
elementErrors[validityName] = validityDefaultErrorMessages[validityName](element);
}
}
}
return elementErrors;
}, []);
var updateError = useCallback(function (_a) {
var element = _a.element, shouldScrollToError = _a.shouldScrollToError, _b = _a.shouldSetErrorClassName, shouldSetErrorClassName = _b === void 0 ? true : _b, _c = _a.shouldSetFieldError, shouldSetFieldError = _c === void 0 ? true : _c;
return __awaiter(void 0, void 0, void 0, function () {
var name, value, validator, elementErrors, _d, _e, elementValidatorErrors, otherFieldsErrors;
var _f, _g;
return __generator(this, function (_h) {
switch (_h.label) {
case 0:
name = element.name, value = element.value;
validator = plugins.validator;
elementErrors = getFieldValidityErrors(element);
if (!(validator !== undefined)) return [3 /*break*/, 2];
return [4 /*yield*/, validator({
name: name,
value: value,
values: state.values, target: element,
})];
case 1:
_d = _h.sent(), _e = name, elementValidatorErrors = _d[_e], otherFieldsErrors = __rest(_d, [typeof _e === "symbol" ? _e : _e + ""]);
elementErrors = __assign(__assign({}, elementValidatorErrors), elementErrors);
Object.entries(otherFieldsErrors).forEach(function (_a) {
var _b = __read(_a, 2), fieldName = _b[0], fieldErrors = _b[1];
var formElement = getFormElements(formRef.current).find(function (_element) { return _element.name === fieldName; });
if (!formElement)
return;
var fieldValidityErrors = getFieldValidityErrors(formElement);
var fieldCombinedErrors = __assign(__assign({}, fieldErrors), fieldValidityErrors);
if (shouldSetErrorClassName) {
setFieldErrorClassName(formElement);
}
if (shouldSetFieldError) {
setFieldErrors({ element: formElement, errors: fieldCombinedErrors });
}
});
_h.label = 2;
case 2:
if (Object.keys(elementErrors).length === 0 && shouldSetFieldError) {
unsetFieldErrorClassName(element);
unsetFieldErrors(element);
return [2 /*return*/, (_f = {}, _f[name] = {}, _f)];
}
if (shouldScrollToError) {
_scrollToError(element);
}
if (shouldSetErrorClassName) {
setFieldErrorClassName(element);
}
if (shouldSetFieldError) {
setFieldErrors({ element: element, errors: elementErrors });
}
return [2 /*return*/, (_g = {}, _g[name] = elementErrors, _g)];
}
});
});
}, [_scrollToError, state.values, plugins, getFieldValidityErrors, setFieldErrors, unsetFieldErrors, getFormElements, setFieldErrorClassName, unsetFieldErrorClassName]);
var resetForm = function () {
var form = formRef.current;
var overriddenInitialValues = state.overriddenInitialValues;
getFormElements(form)
.forEach(function (element) {
var classList = element.classList, type = element.type, value = element.value, name = element.name;
classList.remove(errorClassName, touchedClassName);
setNativeValue({ element: element, value: overriddenInitialValues[name] });
if (type === htmlInputTypes.checkbox || type === htmlInputTypes.radio) {
var checked = type === htmlInputTypes.radio ? value === overriddenInitialValues[name] : overriddenInitialValues[name] === true;
setNativeValue({ element: element, value: checked, attributeToUpdate: htmlAttributes.checked });
element.dispatchEvent(new window.InputEvent(eventTypes.click, { bubbles: true }));
}
element.dispatchEvent(new window.InputEvent(eventTypes.input, { bubbles: true }));
element.dispatchEvent(new window.InputEvent(eventTypes.change, { bubbles: true }));
});
touchedRef.current = {};
dispatch({ type: STATE_ACTIONS.RESET_FORM });
};
var isTouched = useCallback(function (name) { return touchedRef.current[name] === true; }, []);
var validateInputOnChange = useCallback(function (event) { return __awaiter(void 0, void 0, void 0, function () {
var shouldValidate;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
shouldValidate = validateOnInput === true && isTouched(event.target.name);
if (!shouldValidate)
return [2 /*return*/];
if (debounceValidation) {
// @ts-ignore
clearTimeout(validatorDebounceTimeout.current);
event.persist();
validatorDebounceTimeout.current = setTimeout(function () { return __awaiter(void 0, void 0, void 0, function () {
return __generator(this, function (_a) {
switch (_a.label) {
case 0: return [4 /*yield*/, updateError({ element: event.target, shouldScrollToError: scrollToError })];
case 1:
_a.sent();
return [2 /*return*/];
}
});
}); }, debounceTime);
return [2 /*return*/];
}
return [4 /*yield*/, updateError({ element: event.target, shouldScrollToError: scrollToError })];
case 1:
_a.sent();
return [2 /*return*/];
}
});
}); }, [debounceValidation, debounceTime, scrollToError, updateError, validateOnInput, isTouched]);
var onChange = useCallback(function (event) { return __awaiter(void 0, void 0, void 0, function () {
var _a, name, value, type, checked;
return __generator(this, function (_b) {
switch (_b.label) {
case 0:
_a = event.target, name = _a.name, value = _a.value, type = _a.type, checked = _a.checked;
dispatch({
type: STATE_ACTIONS.SET_FIELD_VALUE,
payload: {
name: name,
type: type,
checked: checked,
value: value,
},
});
return [4 /*yield*/, validateInputOnChange(event)];
case 1:
_b.sent();
return [2 /*return*/];
}
});
}); }, [validateInputOnChange]);
var setFieldTouched = useCallback(function (element) {
element.classList.add(touchedClassName);
touchedRef.current[element.name] = true;
}, [touchedClassName]);
var onBlur = useCallback(function (_a) {
var target = _a.target;
return __awaiter(void 0, void 0, void 0, function () {
return __generator(this, function (_b) {
switch (_b.label) {
case 0:
/* Once blur is triggered, input is set to touched which _flags_ onChange
handler to do live validation as the user types */
setFieldTouched(target);
if (!(validateOnInput === true)) return [3 /*break*/, 2];
return [4 /*yield*/, updateError({ element: target, shouldScrollToError: scrollToError })];
case 1:
_b.sent();
_b.label = 2;
case 2: return [2 /*return*/];
}
});
});
}, [updateError, validateOnInput, scrollToError, setFieldTouched]);
var setIsSubmitting = useCallback(function (isSubmitting) {
dispatch({ type: STATE_ACTIONS.SET_IS_SUBMITTING, payload: { isSubmitting: isSubmitting } });
}, []);
var validateForm = useCallback(function (_a) {
var _b = _a === void 0 ? {} : _a, _c = _b.shouldTouchField, shouldTouchField = _c === void 0 ? true : _c, _d = _b.shouldSetErrorClassName, shouldSetErrorClassName = _d === void 0 ? true : _d, _e = _b.shouldScrollToError, shouldScrollToError = _e === void 0 ? scrollToError : _e;
return __awaiter(void 0, void 0, void 0, function () {
var _formElements, errorsArray, errors;
return __generator(this, function (_f) {
switch (_f.label) {
case 0:
_formElements = getFormElements(formRef.current);
if (shouldTouchField === true) {
_formElements.forEach(function (element) { return setFieldTouched(element); });
}
return [4 /*yield*/, Promise.all(_formElements.map(function (element) { return updateError({
element: element,
shouldScrollToError: shouldScrollToError,
shouldSetErrorClassName: shouldSetErrorClassName,
shouldSetFieldError: false,
}); }))];
case 1:
errorsArray = _f.sent();
errors = errorsArray.reduce(function (acc, fieldErrors) { return (__assign(__assign({}, acc), fieldErrors)); }, {});
dispatch({ type: STATE_ACTIONS.SET_ERRORS, payload: { errors: errors } });
return [2 /*return*/, errors];
}
});
});
}, [getFormElements, setFieldTouched, updateError, scrollToError]);
var onSubmit = function (callbackFn) { return function (event) { return __awaiter(void 0, void 0, void 0, function () {
var _isFormValid, _errors, _formElements, elementToScrollInto;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
event.persist();
setIsSubmitting(true);
_isFormValid = state.isFormValid;
_errors = state.errors;
if (!(validateOnSubmit === true)) return [3 /*break*/, 2];
_formElements = getFormElements(formRef.current);
return [4 /*yield*/, validateForm({ shouldScrollToError: scrollToError })];
case 1:
_errors = _a.sent();
_isFormValid = Object.values(_errors).every(function (fieldErrors) { return Object.keys(fieldErrors).length === 0; });
if (!_isFormValid && scrollToError === true) {
elementToScrollInto = _formElements.find(function (element) { return !element.validity.valid || Object.keys(_errors[element.name]).length > 0; });
if (elementToScrollInto !== undefined) {
_scrollToError(elementToScrollInto);
}
}
_a.label = 2;
case 2: return [4 /*yield*/, callbackFn({
event: event,
isFormValid: _isFormValid, errors: _errors, values: state.values,
})];
case 3:
_a.sent();
return [2 /*return*/];
}
});
}); }; };
/**
* getElementInitialValue gets elements "right" initialValue where multiple cases are covered:
* 1) Form field doesn't have explicitly set attribute <value> and it's not set in useForm via initialValues prop
* 2) Form field doesn't have explicitly set attribute <value> but it's set in useForm via initialValues prop
* 3) Form field has explicitly set attribute <value> (controlled input) and it's not set in useForm via initialValues prop
* 4) Form field has explicitly set attribute <value> (controlled input) and has set value via initialValues prop - in this
* case controlled input has precedence and the value from initialValues is overridden
*/
var getElementInitialValue = useCallback(function (_a) {
var name = _a.name, type = _a.type, value = _a.value;
var elementInitialValue = value;
var hasInitialValue = name in state.initialValues;
var isCheckbox = type === htmlInputTypes.checkbox;
var isDefaultNativeHtmlCheckboxValue = value === CHECKBOX_DEFAULT_VALUE;
if (isCheckbox && hasInitialValue === true) {
elementInitialValue = isDefaultNativeHtmlCheckboxValue ? state.initialValues[name] : elementInitialValue === 'true';
}
else if (isCheckbox && hasInitialValue === false) {
elementInitialValue = isDefaultNativeHtmlCheckboxValue ? false : elementInitialValue === 'true';
}
else if (!isCheckbox && hasInitialValue === true) {
elementInitialValue = Boolean(value) === false ? state.initialValues[name] : elementInitialValue;
}
else if (!isCheckbox && hasInitialValue === false) {
elementInitialValue = type === htmlInputTypes.date ? getDefaultDateValue() : elementInitialValue;
}
return elementInitialValue;
}, [state.initialValues]);
/**
* This function ensures that consumer can have custom controlled form fields. In that case
* initial value on the form will be overridden by consumer's custom controlled value
* to persist valid form values in case form gets submitted
* without changing the value in custom controlled input fields
*/
var bindInitialValues = useCallback(function (form) {
var initialValuesToOverride = {};
getFormElements(form)
.forEach(function (element) {
var elementInitialValue = getElementInitialValue(element);
var shouldOverrideInitialValue = element.type !== htmlInputTypes.radio || (element.type === htmlInputTypes.radio && element.checked === true);
if (shouldOverrideInitialValue) {
initialValuesToOverride[element.name] = elementInitialValue;
}
// eslint-disable-next-line no-param-reassign
element.value = elementInitialValue;
if (element.type === htmlInputTypes.checkbox) {
// eslint-disable-next-line no-param-reassign
element.checked = elementInitialValue === true;
}
});
var updatedInitialValues = __assign(__assign({}, state.initialValues), initialValuesToOverride);
// Set proper initial <checked> attribute for radio buttons
__spreadArray([], __read(form.elements), false).filter(function (element) { return element.type === htmlInputTypes.radio; })
.forEach(function (element) {
// eslint-disable-next-line no-param-reassign
element.checked = element.value === updatedInitialValues[element.name];
});
dispatch({ type: STATE_ACTIONS.SET_OVERRIDDEN_INITIAL_VALUES, payload: { overriddenInitialValues: updatedInitialValues } });
}, [getElementInitialValue, state.initialValues, getFormElements]);
var _validatePlugins = useCallback(function () { return validatePlugins(plugins); }, [plugins]);
useEffect(function () {
_validatePlugins();
if (validateOnMount) {
validateForm({ shouldSetErrorClassName: false, shouldTouchField: false });
}
// eslint-disable-next-line react-hooks/exhaustive-deps
}, [validateOnMount]);
useIsUpdated(function () {
updateIsFormValid();
}, [state.errors]);
useEffect(function () {
var form = formRef.current;
bindInitialValues(form);
}, [bindInitialValues]);
var bindUseForm = useMemo(function () { return ({
formRef: formRef,
onBlur: onBlur,
onChange: onChange,
values: state.values,
}); }, [formRef, onChange, onBlur, state.values]);
return {
resetForm: resetForm,
onChange: onChange,
onBlur: onBlur,
onSubmit: onSubmit,
validateForm: validateForm,
isFormValid: state.isFormValid,
isSubmitting: state.isSubmitting,
formRef: formRef,
values: state.values,
errors: state.errors,
bindUseForm: bindUseForm,
setIsSubmitting: setIsSubmitting,
touched: touchedRef.current,
isTouched: isTouched,
};
};
//# sourceMappingURL=useForm.js.map