396deb2e3b
Co-authored-by: Alex Ghiu <alex.ghiu@ing.com> Co-authored-by: Gerjan van Geest <Gerjan.van.Geest@ing.com> Co-authored-by: Thijs Louisse <Thijs.Louisse@ing.com> Co-authored-by: Joren Broekema <joren.broekema@ing.com> Co-authored-by: Erik Kroes <erik.kroes@ing.com>
615 lines
23 KiB
JavaScript
615 lines
23 KiB
JavaScript
/* eslint-disable class-methods-use-this, camelcase, no-param-reassign, max-classes-per-file */
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import { dedupeMixin, SlotMixin } from '@lion/core';
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import { localize } from '@lion/localize';
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import { Unparseable } from './Unparseable.js';
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import { pascalCase } from './utils/pascal-case.js';
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import { Required } from './validators/Required.js';
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import { ResultValidator } from './ResultValidator.js';
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import { SyncUpdatableMixin } from './utils/SyncUpdatableMixin.js';
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import { AsyncQueue } from './utils/AsyncQueue.js';
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import { Validator } from './Validator.js';
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function arrayDiff(array1 = [], array2 = []) {
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return array1.filter(x => !array2.includes(x)).concat(array2.filter(x => !array1.includes(x)));
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}
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/**
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* @desc Handles all validation, based on modelValue changes. It has no knowledge about dom and
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* UI. All error visibility, dom interaction and accessibility are handled in FeedbackMixin.
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*
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* @event error-state-changed fires when FormControl goes from non-error to error state and vice versa
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* @event error-changed fires when the Validator(s) leading to the error state, change
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*/
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export const ValidateMixin = dedupeMixin(
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superclass =>
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// eslint-disable-next-line no-unused-vars, no-shadow
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class ValidateMixin extends SyncUpdatableMixin(SlotMixin(superclass)) {
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static get properties() {
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return {
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/**
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* @desc List of all Validator instances applied to FormControl
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* @type {Validator[]}
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* @example
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* FormControl.validators = [new Required(), new MinLength(3, { type: 'warning' })];
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*/
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validators: Array,
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hasFeedbackFor: {
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type: Array,
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},
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shouldShowFeedbackFor: {
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type: Array,
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},
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showsFeedbackFor: {
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type: Array,
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attribute: 'shows-feedback-for',
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reflect: true,
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converter: {
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fromAttribute: value => value.split(','),
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toAttribute: value => value.join(','),
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},
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},
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validationStates: {
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type: Object,
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// hasChanged: this._hasObjectChanged,
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},
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/**
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* @desc flag that indicates whether async validation is pending
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*/
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isPending: {
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type: Boolean,
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attribute: 'is-pending',
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reflect: true,
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},
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/**
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* @desc value that al validation revolves around: once changed (usually triggered by
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* end user entering input), it will automatically trigger validation.
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*/
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modelValue: Object,
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/**
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* @desc specialized fields (think of input-date and input-email) can have preconfigured
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* validators.
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*/
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defaultValidators: Array,
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/**
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* Subclassers can enable this to show multiple feedback messages at the same time
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* By default, just like the platform, only one message (with highest prio) is visible.
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*/
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_visibleMessagesAmount: Number,
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/**
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* @type {Promise<string>|string} will be passed as an argument to the `.getMessage`
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* method of a Validator. When filled in, this field name can be used to enhance
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* error messages.
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*/
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fieldName: String,
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};
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}
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/**
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* @overridable
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*/
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static get validationTypes() {
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return ['error'];
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}
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/**
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* @overridable
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* Adds "._feedbackNode" as described below
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*/
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get slots() {
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return {
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...super.slots,
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feedback: () => document.createElement('lion-validation-feedback'),
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};
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}
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/**
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* @overridable
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* @type {Element} _feedbackNode:
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* Gets a `FeedbackData` object as its input.
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* This element can be a custom made (web) component that renders messages in accordance with
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* the implemented Design System. For instance, it could add an icon in front of a message.
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* The _feedbackNode is only responsible for the visual rendering part, it should NOT contain
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* state. All state will be determined by the outcome of `FormControl.filterFeeback()`.
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* FormControl delegates to individual sub elements and decides who renders what.
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* For instance, FormControl itself is responsible for reflecting error-state and error-show
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* to its host element.
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* This means filtering out messages should happen in FormControl and NOT in `_feedbackNode`
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*
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* - gets a FeedbackData object as input
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* - should know about the FeedbackMessage types('error', 'success' etc.) that the FormControl
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* (having ValidateMixin applied) returns
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* - renders result and
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*
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*/
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get _feedbackNode() {
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return this.querySelector('[slot=feedback]');
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}
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get _allValidators() {
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return [...this.validators, ...this.defaultValidators];
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}
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constructor() {
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super();
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this.hasFeedbackFor = [];
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this.shouldShowFeedbackFor = [];
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this.showsFeedbackFor = [];
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this.validationStates = {};
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this._visibleMessagesAmount = 1;
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this.isPending = false;
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/** @type {Validator[]} */
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this.validators = [];
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/** @type {Validator[]} */
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this.defaultValidators = [];
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/** @type {Validator[]} */
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this.__syncValidationResult = [];
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/** @type {Validator[]} */
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this.__asyncValidationResult = [];
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/**
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* @desc contains results from sync Validators, async Validators and ResultValidators
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* @type {Validator[]}
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*/
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this.__validationResult = [];
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this.__onValidatorUpdated = this.__onValidatorUpdated.bind(this);
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this._updateFeedbackComponent = this._updateFeedbackComponent.bind(this);
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}
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connectedCallback() {
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super.connectedCallback();
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localize.addEventListener('localeChanged', this._updateFeedbackComponent);
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}
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disconnectedCallback() {
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super.disconnectedCallback();
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localize.addEventListener('localeChanged', this._updateFeedbackComponent);
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}
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/**
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* Should be overridden by subclasses if a different validation-feedback component is used
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*/
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async _loadFeedbackComponent() {
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await import('../lion-validation-feedback.js');
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}
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firstUpdated(c) {
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super.firstUpdated(c);
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this.__validateInitialized = true;
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this.validate();
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this._loadFeedbackComponent();
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}
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updateSync(name, oldValue) {
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super.updateSync(name, oldValue);
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if (name === 'validators') {
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// trigger validation (ideally only for the new or changed validator)
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this.__setupValidators();
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this.validate();
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} else if (name === 'modelValue') {
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this.validate({ clearCurrentResult: true });
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}
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if (['touched', 'dirty', 'prefilled', 'submitted', 'hasFeedbackFor'].includes(name)) {
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this._updateShouldShowFeedbackFor();
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}
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if (name === 'showsFeedbackFor') {
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// This can't be reflected asynchronously in Safari
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// Screen reader output should be in sync with visibility of error messages
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if (this._inputNode) {
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this._inputNode.setAttribute('aria-invalid', this._hasFeedbackVisibleFor('error'));
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// this._inputNode.setCustomValidity(this._validationMessage || '');
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}
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const diff = arrayDiff(this.showsFeedbackFor, oldValue);
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if (diff.length > 0) {
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this.dispatchEvent(new Event(`showsFeedbackForChanged`, { bubbles: true }));
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}
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diff.forEach(type => {
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this.dispatchEvent(
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new Event(`showsFeedbackFor${pascalCase(type)}Changed`, { bubbles: true }),
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);
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});
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}
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if (name === 'shouldShowFeedbackFor') {
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const diff = arrayDiff(this.shouldShowFeedbackFor, oldValue);
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if (diff.length > 0) {
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this.dispatchEvent(new Event(`shouldShowFeedbackForChanged`, { bubbles: true }));
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}
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}
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}
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/**
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* @desc The main function of this mixin. Triggered by:
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* - a modelValue change
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* - a change in the 'validators' array
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* - a change in the config of an individual Validator
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*
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* Three situations are handled:
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* - A.1 The FormControl is empty: further execution is halted. When the Required Validator
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* (being mutually exclusive to the other Validators) is applied, it will end up in the
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* validation result (as the only Validator, since further execution was halted).
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* - A.2 There are synchronous Validators: this is the most common flow. When modelValue hasn't
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* changed since last async results were generated, 'sync results' are merged with the
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* 'async results'.
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* - A.3 There are asynchronous Validators: for instance when server side evaluation is needed.
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* Executions are scheduled and awaited and the 'async results' are merged with the
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* 'sync results'.
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*
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* - B. There are ResultValidators. After steps A.1, A.2, or A.3 are finished, the holistic
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* ResultValidators (evaluating the total result of the 'regular' (A.1, A.2 and A.3) validators)
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* will be run...
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*
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* Situations A.2 and A.3 are not mutually exclusive and can be triggered within one validate()
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* call. Situation B will occur after every call.
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*/
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async validate({ clearCurrentResult } = {}) {
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if (!this.__validateInitialized) {
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return;
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}
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this.__storePrevResult();
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if (clearCurrentResult) {
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// Clear ('invalidate') all pending and existing validation results.
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// This is needed because we have async (pending) validators whose results
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// need to be merged with those of sync validators and vice versa.
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this.__clearValidationResults();
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}
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await this.__executeValidators();
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}
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__storePrevResult() {
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this.__prevValidationResult = this.__validationResult;
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}
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/**
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* @desc step A1-3 + B (as explained in 'validate')
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*/
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async __executeValidators() {
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this.validateComplete = new Promise(resolve => {
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this.__validateCompleteResolve = resolve;
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});
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// When the modelValue can't be created by FormatMixin.parser, still allow all validators
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// to give valuable feedback to the user based on the current viewValue.
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const value =
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this.modelValue instanceof Unparseable ? this.modelValue.viewValue : this.modelValue;
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/** @type {Validator} */
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const requiredValidator = this._allValidators.find(v => v instanceof Required);
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/**
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* 1. Handle the 'exceptional' Required validator:
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* - the validatity is dependent on the formControl type and therefore determined
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* by the formControl.__isEmpty method. Basically, the Required Validator is a means
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* to trigger formControl.__isEmpty.
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* - when __isEmpty returns false, the input was empty. This means we need to stop
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* validation here, because all other Validators' execute functions assume the
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* value is not empty (there would be nothing to validate).
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*/
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const isEmpty = this.__isEmpty(value);
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if (isEmpty) {
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if (requiredValidator) {
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this.__syncValidationResult = [requiredValidator];
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}
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this.__finishValidation({ source: 'sync' });
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return;
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}
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// Separate Validators in sync and async
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const /** @type {Validator[]} */ filteredValidators = this._allValidators.filter(
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v => !(v instanceof ResultValidator) && !(v instanceof Required),
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);
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const /** @type {Validator[]} */ syncValidators = filteredValidators.filter(v => !v.async);
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const /** @type {Validator[]} */ asyncValidators = filteredValidators.filter(v => v.async);
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/**
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* 2. Synchronous validators
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*/
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this.__executeSyncValidators(syncValidators, value, {
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hasAsync: Boolean(asyncValidators.length),
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});
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/**
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* 3. Asynchronous validators
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*/
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await this.__executeAsyncValidators(asyncValidators, value);
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}
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/**
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* @desc step A2, calls __finishValidation
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* @param {Validator[]} syncValidators
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*/
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__executeSyncValidators(syncValidators, value, { hasAsync }) {
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if (syncValidators.length) {
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this.__syncValidationResult = syncValidators.filter(v =>
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v.execute(value, v.param, { node: this }),
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);
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}
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this.__finishValidation({ source: 'sync', hasAsync });
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}
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/**
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* @desc step A3, calls __finishValidation
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* @param {Validator[]} filteredValidators all Validators except required and ResultValidators
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*/
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async __executeAsyncValidators(asyncValidators, value) {
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if (asyncValidators.length) {
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this.isPending = true;
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const resultPromises = asyncValidators.map(v =>
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v.execute(value, v.param, { node: this }),
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);
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const booleanResults = await Promise.all(resultPromises);
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this.__asyncValidationResult = booleanResults
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.map((r, i) => asyncValidators[i]) // Create an array of Validators
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.filter((v, i) => booleanResults[i]); // Only leave the ones returning true
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this.__finishValidation({ source: 'async' });
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this.isPending = false;
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}
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}
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/**
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* @desc step B, called by __finishValidation
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* @param {Validator[]} regularValidationResult result of steps 1-3
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*/
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__executeResultValidators(regularValidationResult) {
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/** @type {ResultValidator[]} */
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const resultValidators = this._allValidators.filter(
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v => !v.async && v instanceof ResultValidator,
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);
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return resultValidators.filter(v =>
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v.executeOnResults({
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regularValidationResult,
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prevValidationResult: this.__prevValidationResult,
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}),
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);
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}
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/**
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* @param {object} options
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* @param {'sync'|'async'} options.source
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* @param {boolean} [options.hasAsync] whether async validators are configured in this run.
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* If not, we have nothing left to wait for.
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*/
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__finishValidation({ source, hasAsync }) {
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const /** @type {Validator[]} */ syncAndAsyncOutcome = [
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...this.__syncValidationResult,
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...this.__asyncValidationResult,
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];
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// if we have any ResultValidators left, now is the time to run them...
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const resultOutCome = this.__executeResultValidators(syncAndAsyncOutcome);
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/** @typedef {Validator[]} TotalValidationResult */
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this.__validationResult = [...resultOutCome, ...syncAndAsyncOutcome];
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// this._storeResultsOnInstance(this.__validationResult);
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const validationStates = this.constructor.validationTypes.reduce(
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(acc, type) => ({ ...acc, [type]: {} }),
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{},
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);
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this.__validationResult.forEach(v => {
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if (!validationStates[v.type]) {
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validationStates[v.type] = {};
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}
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validationStates[v.type][v.name] = true;
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});
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this.validationStates = validationStates;
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this.hasFeedbackFor = [...new Set(this.__validationResult.map(v => v.type))];
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/** private event that should be listened to by LionFieldSet */
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this.dispatchEvent(new Event('validate-performed', { bubbles: true }));
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if (source === 'async' || !hasAsync) {
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this.__validateCompleteResolve();
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}
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}
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__clearValidationResults() {
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this.__syncValidationResult = [];
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this.__asyncValidationResult = [];
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}
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__onValidatorUpdated(e) {
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if (e.type === 'param-changed' || e.type === 'config-changed') {
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this.validate();
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}
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}
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__setupValidators() {
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const events = ['param-changed', 'config-changed'];
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if (this.__prevValidators) {
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this.__prevValidators.forEach(v => {
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events.forEach(e => v.removeEventListener(e, this.__onValidatorUpdated));
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v.onFormControlDisconnect(this);
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});
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}
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this._allValidators.forEach(v => {
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if (!(v instanceof Validator)) {
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// throws in constructor are not visible to end user so we do both
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const errorType = Array.isArray(v) ? 'array' : typeof v;
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const errorMessage = `Validators array only accepts class instances of Validator. Type "${errorType}" found.`;
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// eslint-disable-next-line no-console
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console.error(errorMessage, this);
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throw new Error(errorMessage);
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}
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if (this.constructor.validationTypes.indexOf(v.type) === -1) {
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// throws in constructor are not visible to end user so we do both
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const errorMessage = `This component does not support the validator type "${v.type}" used in "${v.name}". You may change your validators type or add it to the components "static get validationTypes() {}".`;
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// eslint-disable-next-line no-console
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console.error(errorMessage, this);
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throw new Error(errorMessage);
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}
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events.forEach(e => v.addEventListener(e, this.__onValidatorUpdated));
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v.onFormControlConnect(this);
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});
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this.__prevValidators = this._allValidators;
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}
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static _hasObjectChanged(result, prevResult) {
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return JSON.stringify(result) !== JSON.stringify(prevResult);
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}
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__isEmpty(v) {
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if (typeof this._isEmpty === 'function') {
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return this._isEmpty(v);
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}
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// // TODO: move to compat layer. Be sure to keep this, because people use this a lot
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// if (typeof this.__isRequired === 'function') {
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// return !this.__isRequired(v);
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// }
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return v === null || typeof v === 'undefined' || v === '';
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}
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// ------------------------------------------------------------------------------------------
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// -- Feedback specifics --------------------------------------------------------------------
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// ------------------------------------------------------------------------------------------
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/**
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* @typedef {object} FeedbackMessage
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* @property {string} message this
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* @property {string} type will be 'error' for messages from default Validators. Could be
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* 'warning', 'info' etc. for Validators with custom types. Needed as a directive for
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* feedbackNode how to render a message of a certain type
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* @property {Validator} [validator] when the message is directly coupled to a Validator
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* (in most cases), this property is filled. When a message is not coupled to a Validator
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* (in case of success feedback which is based on a diff or current and previous validation
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* results), this property can be left empty.
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*/
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/**
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* @param {Validator[]} validators list of objects having a .getMessage method
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* @return {FeedbackMessage[]}
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*/
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async __getFeedbackMessages(validators) {
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let fieldName = await this.fieldName;
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return Promise.all(
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validators.map(async validator => {
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if (validator.config.fieldName) {
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fieldName = await validator.config.fieldName;
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}
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const message = await validator._getMessage({
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modelValue: this.modelValue,
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formControl: this,
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fieldName,
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});
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return { message, type: validator.type, validator };
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}),
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);
|
|
}
|
|
|
|
/**
|
|
* @desc Responsible for retrieving messages from Validators and
|
|
* (delegation of) rendering them.
|
|
*
|
|
* For `._feedbackNode` (extension of LionValidationFeedback):
|
|
* - retrieve messages from highest prio Validators
|
|
* - provide the result to custom feedback node and let the
|
|
* custom node decide on their renderings
|
|
*
|
|
* In both cases:
|
|
* - we compute the 'show' flag (like 'hasErrorVisible') for all types
|
|
* - we set the customValidity message of the highest prio Validator
|
|
* - we set aria-invalid="true" in case hasErrorVisible is true
|
|
*/
|
|
_updateFeedbackComponent() {
|
|
if (!this.__feedbackQueue) {
|
|
this.__feedbackQueue = new AsyncQueue();
|
|
}
|
|
|
|
if (this.showsFeedbackFor.length > 0) {
|
|
this.__feedbackQueue.add(async () => {
|
|
/** @type {Validator[]} */
|
|
this.__prioritizedResult = this._prioritizeAndFilterFeedback({
|
|
validationResult: this.__validationResult,
|
|
});
|
|
const messageMap = await this.__getFeedbackMessages(this.__prioritizedResult);
|
|
|
|
this._feedbackNode.feedbackData = messageMap.length ? messageMap : [];
|
|
});
|
|
} else {
|
|
this.__feedbackQueue.add(async () => {
|
|
this._feedbackNode.feedbackData = [];
|
|
});
|
|
}
|
|
this.feedbackComplete = this.__feedbackQueue.complete;
|
|
}
|
|
|
|
/**
|
|
* Show the validity feedback when one of the following conditions is met:
|
|
*
|
|
* - submitted
|
|
* If the form is submitted, always show the error message.
|
|
*
|
|
* - prefilled
|
|
* the user already filled in something, or the value is prefilled
|
|
* when the form is initially rendered.
|
|
*
|
|
* - touched && dirty
|
|
* When a user starts typing for the first time in a field with for instance `required`
|
|
* validation, error message should not be shown until a field becomes `touched`
|
|
* (a user leaves(blurs) a field).
|
|
* When a user enters a field without altering the value(making it `dirty`),
|
|
* an error message shouldn't be shown either.
|
|
*/
|
|
_showFeedbackConditionFor(/* type */) {
|
|
return (this.touched && this.dirty) || this.prefilled || this.submitted;
|
|
}
|
|
|
|
_hasFeedbackVisibleFor(type) {
|
|
return (
|
|
this.hasFeedbackFor &&
|
|
this.hasFeedbackFor.includes(type) &&
|
|
this.shouldShowFeedbackFor &&
|
|
this.shouldShowFeedbackFor.includes(type)
|
|
);
|
|
}
|
|
|
|
updated(c) {
|
|
super.updated(c);
|
|
|
|
if (c.has('shouldShowFeedbackFor') || c.has('hasFeedbackFor')) {
|
|
this.showsFeedbackFor = this.constructor.validationTypes
|
|
.map(type => (this._hasFeedbackVisibleFor(type) ? type : undefined))
|
|
.filter(_ => !!_);
|
|
this._updateFeedbackComponent();
|
|
}
|
|
}
|
|
|
|
_updateShouldShowFeedbackFor() {
|
|
this.shouldShowFeedbackFor = this.constructor.validationTypes
|
|
.map(type => (this._showFeedbackConditionFor(type) ? type : undefined))
|
|
.filter(_ => !!_);
|
|
}
|
|
|
|
/**
|
|
* @overridable
|
|
* @desc Orders all active validators in this.__validationResult. Can
|
|
* also filter out occurrences (based on interaction states)
|
|
* @returns {Validator[]} ordered list of Validators with feedback messages visible to the
|
|
* end user
|
|
*/
|
|
_prioritizeAndFilterFeedback({ validationResult }) {
|
|
const types = this.constructor.validationTypes;
|
|
// Sort all validators based on the type provided.
|
|
const res = validationResult.sort((a, b) => types.indexOf(a.type) - types.indexOf(b.type));
|
|
return res.slice(0, this._visibleMessagesAmount);
|
|
}
|
|
},
|
|
);
|