kopia lustrzana https://github.com/shoelace-style/shoelace
325 wiersze
10 KiB
TypeScript
325 wiersze
10 KiB
TypeScript
import '../button-group/button-group';
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import { classMap } from 'lit/directives/class-map.js';
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import { customElement, property, query, state } from 'lit/decorators.js';
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import { FormControlController } from '../../internal/form';
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import { HasSlotController } from '../../internal/slot';
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import { html } from 'lit';
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import { watch } from '../../internal/watch';
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import ShoelaceElement from '../../internal/shoelace-element';
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import styles from './radio-group.styles';
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import type { CSSResultGroup } from 'lit';
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import type { ShoelaceFormControl } from '../../internal/shoelace-element';
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import type SlRadio from '../radio/radio';
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import type SlRadioButton from '../radio-button/radio-button';
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/**
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* @summary Radio groups are used to group multiple [radios](/components/radio) or [radio buttons](/components/radio-button) so they function as a single form control.
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* @documentation https://shoelace.style/components/radio-group
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* @status stable
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* @since 2.0
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*
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* @dependency sl-button-group
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*
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* @slot - The default slot where `<sl-radio>` or `<sl-radio-button>` elements are placed.
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* @slot label - The radio group's label. Required for proper accessibility. Alternatively, you can use the `label`
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* attribute.
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*
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* @event sl-change - Emitted when the radio group's selected value changes.
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* @event sl-input - Emitted when the radio group receives user input.
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*
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* @csspart form-control - The form control that wraps the label, input, and help text.
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* @csspart form-control-label - The label's wrapper.
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* @csspart form-control-input - The input's wrapper.
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* @csspart form-control-help-text - The help text's wrapper.
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* @csspart button-group - The button group that wraps radio buttons.
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* @csspart button-group__base - The button group's `base` part.
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*/
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@customElement('sl-radio-group')
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export default class SlRadioGroup extends ShoelaceElement implements ShoelaceFormControl {
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static styles: CSSResultGroup = styles;
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protected readonly formControlController = new FormControlController(this);
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private readonly hasSlotController = new HasSlotController(this, 'help-text', 'label');
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private customValidityMessage = '';
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private validationTimeout: number;
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@query('slot:not([name])') defaultSlot: HTMLSlotElement;
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@query('.radio-group__validation-input') validationInput: HTMLInputElement;
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@state() private hasButtonGroup = false;
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@state() private errorMessage = '';
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@state() defaultValue = '';
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/**
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* The radio group's label. Required for proper accessibility. If you need to display HTML, use the `label` slot
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* instead.
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*/
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@property() label = '';
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/** The radio groups's help text. If you need to display HTML, use the `help-text` slot instead. */
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@property({ attribute: 'help-text' }) helpText = '';
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/** The name of the radio group, submitted as a name/value pair with form data. */
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@property() name = 'option';
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/** The current value of the radio group, submitted as a name/value pair with form data. */
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@property({ reflect: true }) value = '';
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/**
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* By default, form controls are associated with the nearest containing `<form>` element. This attribute allows you
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* to place the form control outside of a form and associate it with the form that has this `id`. The form must be in
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* the same document or shadow root for this to work.
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*/
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@property({ reflect: true }) form = '';
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/** Ensures a child radio is checked before allowing the containing form to submit. */
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@property({ type: Boolean, reflect: true }) required = false;
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connectedCallback() {
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super.connectedCallback();
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this.defaultValue = this.value;
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}
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firstUpdated() {
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this.formControlController.updateValidity();
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}
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private getAllRadios() {
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return [...this.querySelectorAll<SlRadio | SlRadioButton>('sl-radio, sl-radio-button')];
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}
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private handleRadioClick(event: MouseEvent) {
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const target = event.target as SlRadio | SlRadioButton;
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const radios = this.getAllRadios();
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const oldValue = this.value;
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if (target.disabled) {
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return;
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}
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this.value = target.value;
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radios.forEach(radio => (radio.checked = radio === target));
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if (this.value !== oldValue) {
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this.emit('sl-change');
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this.emit('sl-input');
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}
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}
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private handleKeyDown(event: KeyboardEvent) {
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if (!['ArrowUp', 'ArrowDown', 'ArrowLeft', 'ArrowRight', ' '].includes(event.key)) {
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return;
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}
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const radios = this.getAllRadios().filter(radio => !radio.disabled);
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const checkedRadio = radios.find(radio => radio.checked) ?? radios[0];
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const incr = event.key === ' ' ? 0 : ['ArrowUp', 'ArrowLeft'].includes(event.key) ? -1 : 1;
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const oldValue = this.value;
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let index = radios.indexOf(checkedRadio) + incr;
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if (index < 0) {
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index = radios.length - 1;
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}
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if (index > radios.length - 1) {
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index = 0;
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}
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this.getAllRadios().forEach(radio => {
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radio.checked = false;
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if (!this.hasButtonGroup) {
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radio.tabIndex = -1;
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}
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});
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this.value = radios[index].value;
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radios[index].checked = true;
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if (!this.hasButtonGroup) {
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radios[index].tabIndex = 0;
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radios[index].focus();
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} else {
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radios[index].shadowRoot!.querySelector('button')!.focus();
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}
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if (this.value !== oldValue) {
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this.emit('sl-change');
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this.emit('sl-input');
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}
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event.preventDefault();
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}
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private handleLabelClick() {
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const radios = this.getAllRadios();
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const checked = radios.find(radio => radio.checked);
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const radioToFocus = checked || radios[0];
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// Move focus to the checked radio (or the first one if none are checked) when clicking the label
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if (radioToFocus) {
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radioToFocus.focus();
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}
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}
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private handleSlotChange() {
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const radios = this.getAllRadios();
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radios.forEach(radio => (radio.checked = radio.value === this.value));
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this.hasButtonGroup = radios.some(radio => radio.tagName.toLowerCase() === 'sl-radio-button');
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if (!radios.some(radio => radio.checked)) {
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if (this.hasButtonGroup) {
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const buttonRadio = radios[0].shadowRoot!.querySelector('button')!;
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buttonRadio.tabIndex = 0;
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} else {
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radios[0].tabIndex = 0;
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}
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}
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if (this.hasButtonGroup) {
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const buttonGroup = this.shadowRoot?.querySelector('sl-button-group');
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if (buttonGroup) {
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buttonGroup.disableRole = true;
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}
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}
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}
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private updateCheckedRadio() {
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const radios = this.getAllRadios();
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radios.forEach(radio => (radio.checked = radio.value === this.value));
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this.formControlController.setValidity(this.checkValidity());
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}
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@watch('value')
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handleValueChange() {
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if (this.hasUpdated) {
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this.updateCheckedRadio();
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}
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}
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/** Checks for validity but does not show the browser's validation message. */
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checkValidity() {
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const isRequiredAndEmpty = this.required && !this.value;
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const hasCustomValidityMessage = this.customValidityMessage !== '';
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if (isRequiredAndEmpty || hasCustomValidityMessage) {
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return false;
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}
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return true;
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}
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/** Sets a custom validation message. Pass an empty string to restore validity. */
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setCustomValidity(message = '') {
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this.customValidityMessage = message;
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this.errorMessage = message;
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this.validationInput.setCustomValidity(message);
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this.formControlController.updateValidity();
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}
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/** Checks for validity and shows the browser's validation message if the control is invalid. */
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reportValidity(): boolean {
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const isValid = this.checkValidity();
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this.errorMessage = this.customValidityMessage || isValid ? '' : this.validationInput.validationMessage;
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this.formControlController.setValidity(isValid);
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this.validationInput.hidden = true;
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clearTimeout(this.validationTimeout);
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if (!isValid) {
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// Show the browser's constraint validation message
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this.validationInput.hidden = false;
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this.validationInput.reportValidity();
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this.validationTimeout = setTimeout(() => (this.validationInput.hidden = true), 10000) as unknown as number;
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}
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return isValid;
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}
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render() {
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const hasLabelSlot = this.hasSlotController.test('label');
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const hasHelpTextSlot = this.hasSlotController.test('help-text');
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const hasLabel = this.label ? true : !!hasLabelSlot;
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const hasHelpText = this.helpText ? true : !!hasHelpTextSlot;
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const defaultSlot = html`
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<slot
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@click=${this.handleRadioClick}
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@keydown=${this.handleKeyDown}
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@slotchange=${this.handleSlotChange}
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role="presentation"
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></slot>
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`;
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return html`
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<fieldset
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part="form-control"
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class=${classMap({
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'form-control': true,
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'form-control--medium': true,
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'form-control--radio-group': true,
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'form-control--has-label': hasLabel,
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'form-control--has-help-text': hasHelpText
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})}
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role="radiogroup"
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aria-labelledby="label"
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aria-describedby="help-text"
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aria-errormessage="error-message"
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>
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<label
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part="form-control-label"
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id="label"
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class="form-control__label"
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aria-hidden=${hasLabel ? 'false' : 'true'}
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@click=${this.handleLabelClick}
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>
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<slot name="label">${this.label}</slot>
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</label>
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<div part="form-control-input" class="form-control-input">
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<div class="visually-hidden">
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<div id="error-message" aria-live="assertive">${this.errorMessage}</div>
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<label class="radio-group__validation">
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<input
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type="text"
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class="radio-group__validation-input"
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?required=${this.required}
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tabindex="-1"
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hidden
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/>
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</label>
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</div>
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${this.hasButtonGroup
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? html`
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<sl-button-group part="button-group" exportparts="base:button-group__base">
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${defaultSlot}
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</sl-button-group>
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`
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: defaultSlot}
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</div>
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<slot
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name="help-text"
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part="form-control-help-text"
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id="help-text"
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class="form-control__help-text"
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aria-hidden=${hasHelpText ? 'false' : 'true'}
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>
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${this.helpText}
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</slot>
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</fieldset>
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`;
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/* eslint-enable lit-a11y/click-events-have-key-events */
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}
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}
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declare global {
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interface HTMLElementTagNameMap {
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'sl-radio-group': SlRadioGroup;
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}
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}
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