683 lines
24 KiB
JavaScript
683 lines
24 KiB
JavaScript
import { css, dedupeMixin, html, nothing, SlotMixin } from '@lion/core';
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import { Unparseable } from './validate/Unparseable.js';
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import { FormRegisteringMixin } from './registration/FormRegisteringMixin.js';
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import { getAriaElementsInRightDomOrder } from './utils/getAriaElementsInRightDomOrder.js';
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/**
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* Generates random unique identifier (for dom elements)
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* @param {string} prefix
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*/
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function uuid(prefix) {
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return `${prefix}-${Math.random().toString(36).substr(2, 10)}`;
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}
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/**
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* #FormControlMixin :
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*
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* This Mixin is a shared fundament for all form components, it's applied on:
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* - LionField (which is extended to LionInput, LionTextarea, LionSelect etc. etc.)
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* - LionFieldset (which is extended to LionRadioGroup, LionCheckboxGroup, LionForm)
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*
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* @polymerMixin
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* @mixinFunction
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*/
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export const FormControlMixin = dedupeMixin(
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superclass =>
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// eslint-disable-next-line no-shadow, no-unused-vars
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class FormControlMixin extends FormRegisteringMixin(SlotMixin(superclass)) {
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static get properties() {
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return {
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/**
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* The name the element will be registered on to the .formElements collection
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* of the parent.
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*/
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name: {
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type: String,
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reflect: true,
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},
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/**
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* When no light dom defined and prop set
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*/
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label: String,
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/**
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* When no light dom defined and prop set
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*/
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helpText: {
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type: String,
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attribute: 'help-text',
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},
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/**
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* Contains all elements that should end up in aria-labelledby of `._inputNode`
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*/
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_ariaLabelledNodes: Array,
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/**
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* Contains all elements that should end up in aria-describedby of `._inputNode`
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*/
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_ariaDescribedNodes: Array,
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/**
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* Based on the role, details of handling model-value-changed repropagation differ.
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* @type {'child'|'fieldset'|'choice-group'}
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*/
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_repropagationRole: String,
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/**
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* By default, a field with _repropagationRole 'choice-group' will act as an
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* 'endpoint'. This means it will be considered as an individual field: for
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* a select, individual options will not be part of the formPath. They
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* will.
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* Similarly, components that (a11y wise) need to be fieldsets, but 'interaction wise'
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* (from Application Developer perspective) need to be more like fields
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* (think of an amount-input with a currency select box next to it), can set this
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* to true to hide private internals in the formPath.
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*/
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_isRepropagationEndpoint: Boolean,
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};
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}
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get label() {
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return this.__label || (this._labelNode && this._labelNode.textContent);
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}
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set label(newValue) {
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const oldValue = this.label;
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this.__label = newValue;
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this.requestUpdate('label', oldValue);
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}
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get helpText() {
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return this.__helpText || (this._helpTextNode && this._helpTextNode.textContent);
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}
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set helpText(newValue) {
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const oldValue = this.helpText;
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this.__helpText = newValue;
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this.requestUpdate('helpText', oldValue);
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}
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set fieldName(value) {
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this.__fieldName = value;
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}
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get fieldName() {
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return this.__fieldName || this.label || this.name;
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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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label: () => {
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const label = document.createElement('label');
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label.textContent = this.label;
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return label;
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},
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'help-text': () => {
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const helpText = document.createElement('div');
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helpText.textContent = this.helpText;
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return helpText;
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},
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};
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}
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updated(changedProperties) {
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super.updated(changedProperties);
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if (changedProperties.has('_ariaLabelledNodes')) {
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this.__reflectAriaAttr(
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'aria-labelledby',
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this._ariaLabelledNodes,
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this.__reorderAriaLabelledNodes,
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);
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}
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if (changedProperties.has('_ariaDescribedNodes')) {
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this.__reflectAriaAttr(
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'aria-describedby',
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this._ariaDescribedNodes,
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this.__reorderAriaDescribedNodes,
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);
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}
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if (changedProperties.has('label')) {
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this._onLabelChanged({ label: this.label });
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}
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if (changedProperties.has('helpText')) {
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this._onHelpTextChanged({ helpText: this.helpText });
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}
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}
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get _inputNode() {
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return this.__getDirectSlotChild('input');
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}
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get _labelNode() {
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return this.__getDirectSlotChild('label');
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}
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get _helpTextNode() {
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return this.__getDirectSlotChild('help-text');
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}
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get _feedbackNode() {
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return this.__getDirectSlotChild('feedback');
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}
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constructor() {
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super();
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this._inputId = uuid(this.localName);
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this._ariaLabelledNodes = [];
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this._ariaDescribedNodes = [];
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this._repropagationRole = 'child';
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this.addEventListener('model-value-changed', this.__repropagateChildrenValues);
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}
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connectedCallback() {
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super.connectedCallback();
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this._enhanceLightDomClasses();
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this._enhanceLightDomA11y();
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}
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_enhanceLightDomClasses() {
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if (this._inputNode) {
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this._inputNode.classList.add('form-control');
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}
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}
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_enhanceLightDomA11y() {
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const { _inputNode, _labelNode, _helpTextNode, _feedbackNode } = this;
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if (_inputNode) {
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_inputNode.id = _inputNode.id || this._inputId;
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}
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if (_labelNode) {
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_labelNode.setAttribute('for', this._inputId);
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this.addToAriaLabelledBy(_labelNode, { idPrefix: 'label' });
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}
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if (_helpTextNode) {
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this.addToAriaDescribedBy(_helpTextNode, { idPrefix: 'help-text' });
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}
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if (_feedbackNode) {
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_feedbackNode.setAttribute('aria-live', 'polite');
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this.addToAriaDescribedBy(_feedbackNode, { idPrefix: 'feedback' });
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}
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this._enhanceLightDomA11yForAdditionalSlots();
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}
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/**
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* Enhances additional slots(prefix, suffix, before, after) defined by developer.
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*
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* When boolean attribute data-label or data-description is found,
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* the slot element will be connected to the input via aria-labelledby or aria-describedby
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*/
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_enhanceLightDomA11yForAdditionalSlots(
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additionalSlots = ['prefix', 'suffix', 'before', 'after'],
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) {
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additionalSlots.forEach(additionalSlot => {
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const element = this.__getDirectSlotChild(additionalSlot);
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if (element) {
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if (element.hasAttribute('data-label') === true) {
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this.addToAriaLabelledBy(element, { idPrefix: additionalSlot });
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}
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if (element.hasAttribute('data-description') === true) {
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this.addToAriaDescribedBy(element, { idPrefix: additionalSlot });
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}
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}
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});
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}
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/**
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* Will handle help text, validation feedback and character counter,
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* prefix/suffix/before/after (if they contain data-description flag attr).
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* Also, contents of id references that will be put in the <lion-field>._ariaDescribedby property
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* from an external context, will be read by a screen reader.
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*/
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__reflectAriaAttr(attrName, nodes, reorder) {
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if (this._inputNode) {
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if (reorder) {
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const insideNodes = nodes.filter(n => this.contains(n));
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const outsideNodes = nodes.filter(n => !this.contains(n));
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// eslint-disable-next-line no-param-reassign
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nodes = [...getAriaElementsInRightDomOrder(insideNodes), ...outsideNodes];
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}
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const string = nodes.map(n => n.id).join(' ');
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this._inputNode.setAttribute(attrName, string);
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}
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}
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_onLabelChanged({ label }) {
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if (this._labelNode) {
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this._labelNode.textContent = label;
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}
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}
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_onHelpTextChanged({ helpText }) {
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if (this._helpTextNode) {
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this._helpTextNode.textContent = helpText;
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}
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}
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/**
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* Default Render Result:
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* <div class="form-field__group-one">
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* <div class="form-field__label">
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* <slot name="label"></slot>
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* </div>
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* <small class="form-field__help-text">
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* <slot name="help-text"></slot>
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* </small>
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* </div>
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* <div class="form-field__group-two">
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* <div class="input-group">
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* <div class="input-group__before">
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* <slot name="before"></slot>
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* </div>
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* <div class="input-group__container">
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* <div class="input-group__prefix">
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* <slot name="prefix"></slot>
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* </div>
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* <div class="input-group__input">
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* <slot name="input"></slot>
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* </div>
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* <div class="input-group__suffix">
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* <slot name="suffix"></slot>
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* </div>
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* </div>
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* <div class="input-group__after">
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* <slot name="after"></slot>
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* </div>
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* </div>
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* <div class="form-field__feedback">
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* <slot name="feedback"></slot>
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* </div>
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* </div>
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*/
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render() {
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return html`
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<div class="form-field__group-one">
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${this._groupOneTemplate()}
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</div>
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<div class="form-field__group-two">
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${this._groupTwoTemplate()}
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</div>
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`;
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}
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_groupOneTemplate() {
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return html` ${this._labelTemplate()} ${this._helpTextTemplate()} `;
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}
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_groupTwoTemplate() {
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return html` ${this._inputGroupTemplate()} ${this._feedbackTemplate()} `;
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}
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// eslint-disable-next-line class-methods-use-this
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_labelTemplate() {
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return html`
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<div class="form-field__label">
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<slot name="label"></slot>
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</div>
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`;
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}
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// eslint-disable-next-line class-methods-use-this
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_helpTextTemplate() {
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return html`
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<small class="form-field__help-text">
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<slot name="help-text"></slot>
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</small>
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`;
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}
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_inputGroupTemplate() {
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return html`
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<div class="input-group">
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${this._inputGroupBeforeTemplate()}
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<div class="input-group__container">
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${this._inputGroupPrefixTemplate()} ${this._inputGroupInputTemplate()}
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${this._inputGroupSuffixTemplate()}
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</div>
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${this._inputGroupAfterTemplate()}
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</div>
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`;
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}
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// eslint-disable-next-line class-methods-use-this
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_inputGroupBeforeTemplate() {
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return html`
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<div class="input-group__before">
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<slot name="before"></slot>
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</div>
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`;
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}
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_inputGroupPrefixTemplate() {
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return !Array.from(this.children).find(child => child.slot === 'prefix')
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? nothing
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: html`
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<div class="input-group__prefix">
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<slot name="prefix"></slot>
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</div>
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`;
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}
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// eslint-disable-next-line class-methods-use-this
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_inputGroupInputTemplate() {
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return html`
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<div class="input-group__input">
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<slot name="input"></slot>
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</div>
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`;
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}
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_inputGroupSuffixTemplate() {
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return !Array.from(this.children).find(child => child.slot === 'suffix')
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? nothing
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: html`
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<div class="input-group__suffix">
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<slot name="suffix"></slot>
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</div>
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`;
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}
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// eslint-disable-next-line class-methods-use-this
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_inputGroupAfterTemplate() {
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return html`
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<div class="input-group__after">
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<slot name="after"></slot>
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</div>
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`;
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}
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_isEmpty(modelValue = this.modelValue) {
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let value = modelValue;
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if (this.modelValue instanceof Unparseable) {
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value = this.modelValue.viewValue;
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}
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// Checks for empty platform types: Objects, Arrays, Dates
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if (typeof value === 'object' && value !== null && !(value instanceof Date)) {
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return !Object.keys(value).length;
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}
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// eslint-disable-next-line no-mixed-operators
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// Checks for empty platform types: Numbers, Booleans
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const isNumberValue = typeof value === 'number' && (value === 0 || Number.isNaN(value));
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const isBooleanValue = typeof value === 'boolean' && value === false;
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return !value && !isNumberValue && !isBooleanValue;
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}
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// eslint-disable-next-line class-methods-use-this
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_feedbackTemplate() {
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return html`
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<div class="form-field__feedback">
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<slot name="feedback"></slot>
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</div>
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`;
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}
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/**
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* All CSS below is written from a generic mindset, following BEM conventions:
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* https://en.bem.info/methodology/
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* Although the CSS and HTML are implemented by the component, they should be regarded as
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* totally decoupled.
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*
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* Not only does this force us to write better structured css, it also allows for future
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* reusability in many different ways like:
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* - disabling shadow DOM for a component (for water proof encapsulation can be combined with
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* a build step)
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* - easier translation to more flexible, WebComponents agnostic solutions like JSS
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* (allowing extends, mixins, reasoning, IDE integration, tree shaking etc.)
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* - export to a CSS module for reuse in an outer context
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*
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*
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* Please note that the HTML structure is purposely 'loose', allowing multiple design systems
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* to be compatible
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* with the CSS component.
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* Note that every occurence of '::slotted(*)' can be rewritten to '> *' for use in an other
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* context
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*/
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/**
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* {block} .form-field
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*
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* Structure:
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* - {element} .form-field__label : a wrapper element around the projected label
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* - {element} .form-field__help-text (optional) : a wrapper element around the projected
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* help-text
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* - {block} .input-group : a container around the input element, including prefixes and
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* suffixes
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* - {element} .form-field__feedback (optional) : a wrapper element around the projected
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* (validation) feedback message
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*
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* Modifiers:
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* - {state} [disabled] when .form-control (<input>, <textarea> etc.) has disabled set
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* to true
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* - {state} [filled] whether <input> has a value
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* - {state} [touched] whether the user had blurred the field once
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* - {state} [dirty] whether the value has changed since initial value
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*
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* TODO: update states below
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* These classes are now attributes. Check them agains the new attribute names inside ValidateMixin
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* and InteractionStateMixin. Some states got renamed. Make sure to use the correct ones!
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* - {state} .state-focused: when .form-control (<input>, <textarea> etc.) <input> has focus
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* - {state} .state-invalid: when input has error(s) (regardless of whether they should be
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* shown to the user)
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* - {state} .state-error: when input has error(s) and this/these should be shown to the user
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* - {state} .state-warning: when input has warning(s) and this/these should be shown to the
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* user
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* - {state} .state-info: when input has info feedback message(s) and this/these should be shown
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* to the user
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* - {state} .state-success: when input has success feedback message(s) and this/these should be
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* shown to the user
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*/
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/**
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* {block} .input-group
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*
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* Structure:
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* - {element} .input-group__before (optional) : a prefix that resides outside the container
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* - {element} .input-group__container : an inner container: this element contains all styling
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* - {element} .input-group__prefix (optional) : a prefix that resides in the container,
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* allowing it to be detectable as a :first-child
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* - {element} .input-group__input : a wrapper around the form-control component
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* - {block} .form-control : the actual input element (input/select/textarea)
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* - {element} .input-group__suffix (optional) : a suffix that resides inside the container,
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* allowing it to be detectable as a :last-child
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* - {element} .input-group__bottom (optional) : placeholder element for additional styling
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* (like an animated line for material design input)
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* - {element} .input-group__after (optional) : a suffix that resides outside the container
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*/
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static get styles() {
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return [
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css`
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/**********************
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{block} .form-field
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********************/
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:host {
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display: block;
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}
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:host([hidden]) {
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display: none;
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}
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:host([disabled]) {
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pointer-events: none;
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}
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:host([disabled]) .form-field__label ::slotted(*),
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:host([disabled]) .form-field__help-text ::slotted(*) {
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color: var(--disabled-text-color, #adadad);
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}
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/***********************
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{block} .input-group
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*********************/
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.input-group__container {
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display: flex;
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}
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.input-group__input {
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flex: 1;
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display: flex;
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}
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/***** {state} :disabled *****/
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:host([disabled]) .input-group ::slotted(slot='input') {
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color: var(--disabled-text-color, #adadad);
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}
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/***********************
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{block} .form-control
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**********************/
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.input-group__container > .input-group__input ::slotted(.form-control) {
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flex: 1 1 auto;
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margin: 0; /* remove input margin in Safari */
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font-size: 100%; /* normalize default input font-size */
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}
|
|
`,
|
|
];
|
|
}
|
|
|
|
// Returns dom references to all elements that should be referred to by field(s)
|
|
_getAriaDescriptionElements() {
|
|
return [this._helpTextNode, this._feedbackNode];
|
|
}
|
|
|
|
/**
|
|
* Meant for Application Developers wanting to add to aria-labelledby attribute.
|
|
* @param {Element} element
|
|
*/
|
|
addToAriaLabelledBy(element, customConfig = {}) {
|
|
const { idPrefix, reorder } = {
|
|
reorder: true,
|
|
...customConfig,
|
|
};
|
|
|
|
// eslint-disable-next-line no-param-reassign
|
|
element.id = element.id || `${idPrefix}-${this._inputId}`;
|
|
if (!this._ariaLabelledNodes.includes(element)) {
|
|
this._ariaLabelledNodes = [...this._ariaLabelledNodes, element];
|
|
// This value will be read when we need to reflect to attr
|
|
this.__reorderAriaLabelledNodes = Boolean(reorder);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Meant for Application Developers wanting to add to aria-describedby attribute.
|
|
* @param {Element} element
|
|
*/
|
|
addToAriaDescribedBy(element, customConfig = {}) {
|
|
const { idPrefix, reorder } = {
|
|
// chronologically sorts children of host element('this')
|
|
reorder: true,
|
|
...customConfig,
|
|
};
|
|
|
|
// eslint-disable-next-line no-param-reassign
|
|
element.id = element.id || `${idPrefix}-${this._inputId}`;
|
|
if (!this._ariaDescribedNodes.includes(element)) {
|
|
this._ariaDescribedNodes = [...this._ariaDescribedNodes, element];
|
|
// This value will be read when we need to reflect to attr
|
|
this.__reorderAriaDescribedNodes = Boolean(reorder);
|
|
}
|
|
}
|
|
|
|
__getDirectSlotChild(slotName) {
|
|
return [...this.children].find(el => el.slot === slotName);
|
|
}
|
|
|
|
firstUpdated(changedProperties) {
|
|
super.firstUpdated(changedProperties);
|
|
this.__dispatchInitialModelValueChangedEvent();
|
|
}
|
|
|
|
async __dispatchInitialModelValueChangedEvent() {
|
|
// When we are not a fieldset / choice-group, we don't need to wait for our children
|
|
// to send a unified event
|
|
if (this._repropagationRole === 'child') {
|
|
return;
|
|
}
|
|
|
|
await this.registrationComplete;
|
|
// Initially we don't repropagate model-value-changed events coming
|
|
// from children. On firstUpdated we re-dispatch this event to maintain
|
|
// 'count consistency' (to not confuse the application developer with a
|
|
// large number of initial events). Initially the source field will not
|
|
// be part of the formPath but afterwards it will.
|
|
this.__repropagateChildrenInitialized = true;
|
|
this.dispatchEvent(
|
|
new CustomEvent('model-value-changed', {
|
|
bubbles: true,
|
|
detail: { formPath: [this], initialize: true },
|
|
}),
|
|
);
|
|
}
|
|
|
|
// eslint-disable-next-line class-methods-use-this, no-unused-vars
|
|
_onBeforeRepropagateChildrenValues(ev) {}
|
|
|
|
__repropagateChildrenValues(ev) {
|
|
// Allows sub classes to internally listen to the children change events
|
|
// (before stopImmediatePropagation is called below).
|
|
this._onBeforeRepropagateChildrenValues(ev);
|
|
// Normalize target, we also might get it from 'portals' (rich select)
|
|
const target = (ev.detail && ev.detail.element) || ev.target;
|
|
const isEndpoint =
|
|
this._isRepropagationEndpoint || this._repropagationRole === 'choice-group';
|
|
|
|
// Prevent eternal loops after we sent the event below.
|
|
if (target === this) {
|
|
return;
|
|
}
|
|
|
|
// A. Stop sibling handlers
|
|
//
|
|
// Make sure our sibling event listeners (added by Application developers) will not get
|
|
// the child model-value-changed event, but the repropagated one at the bottom of this
|
|
// method
|
|
ev.stopImmediatePropagation();
|
|
|
|
// B1. Are we still initializing? If so, halt...
|
|
//
|
|
// Stop repropagating children events before firstUpdated and make sure we de not
|
|
// repropagate init events of our children (we already sent our own
|
|
// initial model-value-change event in firstUpdated)
|
|
const isGroup = this._repropagationRole !== 'child'; // => fieldset or choice-group
|
|
const isSelfInitializing = isGroup && !this.__repropagateChildrenInitialized;
|
|
const isChildGroupInitializing = ev.detail && ev.detail.initialize;
|
|
if (isSelfInitializing || isChildGroupInitializing) {
|
|
return;
|
|
}
|
|
|
|
// B2. Are we a single choice choice-group? If so, halt when unchecked
|
|
//
|
|
// We only send the checked changed up (not the unchecked). In this way a choice group
|
|
// (radio-group, checkbox-group, select/listbox) acts as an 'endpoint' (a single Field)
|
|
// just like the native <select>
|
|
if (this._repropagationRole === 'choice-group' && !this.multipleChoice && !target.checked) {
|
|
return;
|
|
}
|
|
|
|
// C1. We are ready to dispatch. Create a formPath
|
|
//
|
|
// Compute the formPath. Choice groups are regarded 'end points'
|
|
let parentFormPath = [];
|
|
if (!isEndpoint) {
|
|
parentFormPath = (ev.detail && ev.detail.formPath) || [target];
|
|
}
|
|
const formPath = [...parentFormPath, this];
|
|
|
|
// C2. Finally, redispatch a fresh model-value-changed event from our host, consumable
|
|
// for an Application Developer
|
|
//
|
|
// Since for a11y everything needs to be in lightdom, we don't add 'composed:true'
|
|
this.dispatchEvent(
|
|
new CustomEvent('model-value-changed', { bubbles: true, detail: { formPath } }),
|
|
);
|
|
}
|
|
},
|
|
);
|