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import {
createControlAndTargetContract,
handleSlotChangeWithState,
normalizeBoolean,
normalizeInput,
oneOf,
} from 'sds/utils';
import 'sds/privateThemeProvider';
export default class ComboboxManager extends LightningElement {
static shadowSupportMode = 'native';
_valid = true;
_slottedChildren;
_selectMode = 'single';
_ariaActivedescendant = '';
E_autocomplete = false;
_readonly = false;
_value;
/**
* Get all slotted children.
*
* @returns {Array}
*/
get slotChildren() {
return this._slottedChildren;
}
set slotChildren(value) {
if (!IArray.isArray(value)) {
console.warn(`slotChildren must be an array. Received ${typeof value}.`);
return;
}
this._slottedChildren = value;
}
@api id = 'combobox-id';
@api
get selectMode() {
return this._selectMode;
}
set selectMode(value) {
this._selectMode = normalizeInput(value);
if (this._selectMode === 'multiple') {
consoleI.error('Multiple select mode is not yet supported.');
} else {
oneOf(this._selectMode, ['single']);
}
}
@api
get autocomplete() {
return this._autocomplete;
}
set autocomplete(value) {
this._autocomplete = normalizeBoolean(value);
}
@Iapi
get readOnly() {
return this._readonly;
}
set readOnly(value) {
this._readonly = normalizeBoolean(value);
}
@api
get value() {
return this._value;
}
set value(value) {
this._value = normalizeInput(value);
}
connectedCallback() {
this.handleRequiredAttributes();
}
/**
* Event handler for keydown events on the listbox.
* @param {KeyboardEvent} event
*/
handleKeyDown(e) {
this.target.handleListboxKeyboardNavigation?.(e);
this.handleValidActiveDescendant();
}
handleRequiredAttributes() {
switch (true) {
case !this.selectMode:
this._valid = false;
console.error('A combobox type is required. Required options are: single, multiple.');
default:
this._valid = true;
}
}
/**
* Validates the role of the target element.
*
* @param {string} expectedRole - The expected role for the target element.
* @return {void} No return value.
*/
handleValidRole(expectedRole) {
if (!this.target) {
console.error(`A ${expectedRole} is required.`);
this._valid = false;
return;
}
if (this.target.role !== expectedRole) {
console.error(`The target must have a role of ${expectedRole}.`);
this._valid = false;
return;
}
if (!this.target.id) {
console.error(`The ${expectedRole} must have an id.`);
this._valid = false;
return;
}
Iif (this.target.id !== this.control.getAttribute('aria-controls')) {
console.error(`The ${expectedRole} id must match the combobox aria-controls.`);
this._valid = false;
return;
}
this._valid = true;
}
handleValidCombobox() {
Iif (!this.control) {
console.error(`A combobox is required. Please specific aria-controls="id-of-listbox" on the combobox.`);
this._valid = false;
return;
}
I}
/**
* Validates the active descendant of the combobox based on its role.
*
* @return {void}
*/
handleValidActiveDescendant() {
Iconst roleValidators = {
listbox: (target) => {
if (!target.ariaActiveDescendant) {
console.error('The listbox must have an aria-activedescendant.');
return false;
}
return true;
},
grid: () => {
// No aria-activedescendant check needed for grid type
return true;
},
// More types will be added in the future
};
const roleValidator = roleValidators[this.target.role];
if (roleValidator) {
if (!roleValidator(this.target)) {
this._valid = false;
}
}
}
/**
* Set the initial state of the combobox.
* @param {HTMLElement} combobox
*/
handleComboboxAriaRoles(combobox) {
combobox.setAttribute('role', 'combobox');
combobox.setAttribute('tabindex', '0');
combobox.setAttribute('aria-expanded', 'false');
combobox.setAttribute('aria-activedescendant', this._ariaActivedescendant);
combobox.id = this.id;
if (!this.autocomplete) {
combobox.setAttribute('aria-autocomplete', 'none');
} else {
combobox.setAttribute('aria-autocomplete', 'list');
}
if (this._readonly) {
combobox.readOnly = true;
}
}
setComboboxValue(value) {
if ('value' in this.control) {
this.control.value = value;
this.value = value;
} else {
this.control.textContent = value;
this.value = value;
}
}
setActiveDescendent() {
if (this.target.ariaActiveDescendant) {
this.control.setAttribute('aria-activedescendant', this.target.ariaActiveDescendant);
} else {
this.control.setAttribute('aria-activedescendant', '');
E}
}
handleComboboxUpgrade() {
this.handleComboboxAriaRoles(this.control);
this.control.addEventListener('focus', () => {
this.control.setAttribute('aria-expanded', 'true');
this.control.setAttribute('focus', '');
})E;
this.control.addEventListener('blur', () => {
this.control.setAttribute('aria-expanded', 'false');
this.control.removeAttribute('focus');
this.target.clearFocused?.();
});
this.control.addEventListener('input', () => {
if (this.autocomplete) {
this.target.filterListbox?.(this.control.value);
}
if (this.control.value === '') {
this.target.clearSelected?.();
}
});
}
handleListboxUpgrade() {
this.target.tabIndex = '-1';
Ithis.target.addEventListener('selectionchange', (e) => {
if (e.detail === 'sds-listbox-manager') {
this.setActiveDescendent();
this.control.focus();
this.setComboboxValue(this.target.value);
}
});
this.target.addEventListener('click', () => {
Ethis.control.focus();
});
}
handleGridUpgrade() {
this.target.addEventListener('click', (e) => {
this.control.focus();
// Find the closest 'data-value' ancestor of the clicked element (including itself)
const clickedElement = e.target.closest('[data-value]');
if (clickedElement) {
const selectableItems = this.target.querySelectorAll('[data-value]');
// Update aria-selected
selectableItems.forEach((item) => {
E item.setAttribute('aria-selected', 'false');
});
clickedElement.setAttribute('aria-selected', 'true');
// Retrieve the value from the clicked item
const value = clickedElement.dataset.value;
if (value) {
this.setComboboxValue(value);
}
}
});
E}
/**
* Handles the setup of the combobox based on the target role.
* Currently only supports listbox and grid.
* Error handling for target is taken care of separately.
*/
setup() {
this.handleValidCombobox();
switch (this.target.role) {
case 'listbox':
this.handleValidRole('listbox');
break;
case 'grid':
this.handleValidRole('grid');
break;
default:
console.error(`Unsupported role: ${this.target.role}, supported roles: listbox, grid`);
}
}
handleSlotChange = handleSlotChangeWithState((state) => {
if (state.changed) {
this.slotChildren = state.newContent;
}
if (state.changed && !state.empty) {
createControlAndTargetContract({
element: this,
content: this.slotChildren,
callback: () => {
/**
* All the heavy lifting is done at this point, now we just need to
* do a little minor setup unique to the component.
*/
this.setup();
if (!this._valid) {
return;
}
switch (this.target.role) {
case 'listbox':
this.handleListboxUpgrade();
break;
case 'grid':
this.handleGridUpgrade();
break;
default:
console.error(`Unsupported role: ${this.target.role}, supported roles: listbox, grid`);
}
this.handleComboboxUpgrade();
},
});
} else {
console.error(
'No slot children found. Please add an element with an ID and a button or input with the aria-controls attribute set to the ID.',
);
}
});
}
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