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MDL-76246 output: combobox support improvements
- It was a mistake to assume the listbox is always within combobox.parentElement - Take into account that the popup of the combobox is not necessarily a listbox - Update combobox fix so that it also work with comboboxes that are not select-menu - Update combobox fix so that it also support editable comboboxes - Update click listener to take into account that the event's target might be one of the option element - Having a hidden input element for comboboxes was not an ARIA requirement and was added by us. I added data-input-element to the combobox element to specify the input element related to it.
This commit is contained in:
Shamim Rezaie
parent
775872450c
commit
c4f33ceb59
@ -96,6 +96,7 @@
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aria-haspopup="listbox"
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aria-expanded="false"
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aria-controls="{{baseid}}-listbox"
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data-input-element="{{baseid}}-input"
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tabindex="0"
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>
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{{selectedoption}}
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@ -121,7 +122,7 @@
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{{/isgroup}}
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{{/options}}
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</ul>
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<input type="hidden" name="{{name}}" value="{{value}}" />
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<input type="hidden" name="{{name}}" value="{{value}}" id="{{baseid}}-input" />
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</div>
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{{#js}}
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var label = document.getElementById('{{baseid}}-label');
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2
theme/boost/amd/build/aria.min.js
vendored
2
theme/boost/amd/build/aria.min.js
vendored
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File diff suppressed because one or more lines are too long
@ -206,53 +206,60 @@ const comboboxFix = () => {
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$(document).on('show.bs.dropdown', e => {
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if (e.relatedTarget.matches('[role="combobox"]')) {
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const combobox = e.relatedTarget;
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const listbox = combobox.parentElement.querySelector('[role="listbox"]');
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const selectedOption = listbox.querySelector('[role="option"][aria-selected="true"]');
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const listbox = document.querySelector(`#${combobox.getAttribute('aria-controls')}[role="listbox"]`);
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// To make sure ArrowDown doesn't move the active option afterwards.
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setTimeout(() => {
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if (selectedOption) {
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selectedOption.classList.add('active');
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combobox.setAttribute('aria-activedescendant', selectedOption.id);
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} else {
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const firstOption = listbox.querySelector('[role="option"]');
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firstOption.setAttribute('aria-selected', 'true');
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firstOption.classList.add('active');
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combobox.setAttribute('aria-activedescendant', firstOption.id);
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}
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}, 0);
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if (listbox) {
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const selectedOption = listbox.querySelector('[role="option"][aria-selected="true"]');
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// To make sure ArrowDown doesn't move the active option afterwards.
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setTimeout(() => {
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if (selectedOption) {
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selectedOption.classList.add('active');
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combobox.setAttribute('aria-activedescendant', selectedOption.id);
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} else {
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const firstOption = listbox.querySelector('[role="option"]');
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firstOption.setAttribute('aria-selected', 'true');
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firstOption.classList.add('active');
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combobox.setAttribute('aria-activedescendant', firstOption.id);
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}
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}, 0);
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}
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}
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});
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$(document).on('hidden.bs.dropdown', e => {
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if (e.relatedTarget.matches('[role="combobox"]')) {
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const combobox = e.relatedTarget;
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const listbox = combobox.parentElement.querySelector('[role="listbox"]');
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const listbox = document.querySelector(`#${combobox.getAttribute('aria-controls')}[role="listbox"]`);
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combobox.removeAttribute('aria-activedescendant');
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setTimeout(() => {
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// Undo all previously highlighted options.
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listbox.querySelectorAll('.active[role="option"]').forEach(option => {
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option.classList.remove('active');
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});
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}, 0);
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if (listbox) {
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setTimeout(() => {
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// Undo all previously highlighted options.
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listbox.querySelectorAll('.active[role="option"]').forEach(option => {
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option.classList.remove('active');
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});
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}, 0);
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}
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}
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});
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// Handling keyboard events for both navigating through and selecting options.
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document.addEventListener('keydown', e => {
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if (e.target.matches('.select-menu [role="combobox"]')) {
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if (e.target.matches('[role="combobox"][aria-controls]:not([aria-haspopup=dialog])')) {
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const combobox = e.target;
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const trigger = e.key;
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let next = null;
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const options = combobox.parentElement.querySelectorAll('[role="listbox"] [role="option"]');
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const activeOption = combobox.parentElement.querySelector('[role="listbox"] .active[role="option"]');
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const listbox = document.querySelector(`#${combobox.getAttribute('aria-controls')}[role="listbox"]`);
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const options = listbox.querySelectorAll('[role="option"]');
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const activeOption = listbox.querySelector('.active[role="option"]');
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const editable = combobox.hasAttribute('aria-autocomplete');
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// Under the special case that the dropdown menu is being shown as a result of they key press (like when the user
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// Under the special case that the dropdown menu is being shown as a result of the key press (like when the user
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// presses ArrowDown or Enter or ... to open the dropdown menu), activeOption is not set yet.
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// It's because of a race condition with show.bs.dropdown event handler.
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if (options && activeOption) {
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if (options && (activeOption || editable)) {
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if (trigger == 'ArrowDown') {
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for (let i = 0; i < options.length - 1; i++) {
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if (options[i] == activeOption) {
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@ -260,6 +267,9 @@ const comboboxFix = () => {
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break;
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}
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}
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if (editable && !next) {
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next = options[0];
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}
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} if (trigger == 'ArrowUp') {
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for (let i = 1; i < options.length; i++) {
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if (options[i] == activeOption) {
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@ -267,13 +277,17 @@ const comboboxFix = () => {
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break;
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}
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}
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if (editable && !next) {
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next = options[options.length - 1];
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}
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} else if (trigger == 'Home') {
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next = options[0];
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} else if (trigger == 'End') {
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next = options[options.length - 1];
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} else if (trigger == ' ' || trigger == 'Enter') {
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} else if ((trigger == ' ' && !editable) || trigger == 'Enter') {
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e.preventDefault();
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selectOption(combobox, activeOption);
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} else {
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} else if (!editable) {
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// Search for options by finding the first option that has
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// text starting with the typed character (case insensitive).
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for (let i = 0; i < options.length; i++) {
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@ -290,27 +304,33 @@ const comboboxFix = () => {
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// Variable next is set if we do want to act on the keypress.
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if (next) {
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e.preventDefault();
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activeOption.classList.remove('active');
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if (activeOption) {
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activeOption.classList.remove('active');
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}
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next.classList.add('active');
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combobox.setAttribute('aria-activedescendant', next.id);
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next.scrollIntoView({block: 'nearest'});
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}
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}
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}
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});
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document.addEventListener('click', e => {
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if (e.target.matches('.select-menu [role="option"]')) {
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const option = e.target;
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const combobox = option.closest('.select-menu').querySelector('[role="combobox"]');
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combobox.focus();
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selectOption(combobox, option);
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const option = e.target.closest('[role="listbox"] [role="option"]');
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if (option) {
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const listbox = option.closest('[role="listbox"]');
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const combobox = document.querySelector(`[role="combobox"][aria-controls="${listbox.id}"]`);
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if (combobox) {
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combobox.focus();
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selectOption(combobox, option);
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}
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}
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});
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// In case some code somewhere else changes the value of the combobox.
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document.addEventListener('change', e => {
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if (e.target.matches('.select-menu input[type="hidden"]')) {
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const combobox = e.target.parentElement.querySelector('[role="combobox"]');
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if (e.target.matches('input[type="hidden"][id]')) {
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const combobox = document.querySelector(`[role="combobox"][data-input-element="${e.target.id}"]`);
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const option = e.target.parentElement.querySelector(`[role="option"][data-value="${e.target.value}"]`);
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if (combobox && option) {
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@ -320,8 +340,8 @@ const comboboxFix = () => {
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});
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const selectOption = (combobox, option) => {
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const oldSelectedOption = combobox.parentElement.querySelector('[role="listbox"] [role="option"][aria-selected="true"]');
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const inputElement = combobox.parentElement.querySelector('input[type="hidden"]');
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const listbox = option.closest('[role="listbox"]');
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const oldSelectedOption = listbox.querySelector('[role="option"][aria-selected="true"]');
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if (oldSelectedOption != option) {
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if (oldSelectedOption) {
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@ -329,10 +349,19 @@ const comboboxFix = () => {
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}
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option.setAttribute('aria-selected', 'true');
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}
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combobox.textContent = option.textContent;
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if (inputElement.value != option.dataset.value) {
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inputElement.value = option.dataset.value;
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inputElement.dispatchEvent(new Event('change', {bubbles: true}));
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if (combobox.hasAttribute('value')) {
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combobox.value = option.textContent.replace(/[\n\r]+|[\s]{2,}/g, ' ').trim();
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} else {
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combobox.textContent = option.textContent;
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}
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if (combobox.dataset.inputElement) {
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const inputElement = document.getElementById(combobox.dataset.inputElement);
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if (inputElement && (inputElement.value != option.dataset.value)) {
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inputElement.value = option.dataset.value;
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inputElement.dispatchEvent(new Event('change', {bubbles: true}));
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}
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}
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};
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};
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