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opensearch-dropdown.html
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<template id="opensearch_dropdown_element_tpl">
<style>
:host,
:host([orientation="vertical"]) {
display: inline-flex;
flex-direction: column;
align-items: stretch;
justify-content: stretch;
position: relative;
}
:host([orientation="horizontal"]) {
display: inline-flex;
flex-direction: row;
align-items: center;
justify-content: flex-start;
}
:host > opensearch-collapsible-panel {
width: 100%;
}
:host > opensearch-collapsible-panel[expanded] > .list-items {
border-style: ridge;
border-radius: 4px;
border-color: #b9d9eb;
}
:host > opensearch-collapsible-panel > opensearch-toggle-button {
width: 100%;
}
:host > opensearch-collapsible-panel > opensearch-toggle-button > opensearch-button {
width: 100%;
}
opensearch-dropdown-item,
opensearch-dropdown-checkbox-item {
display: flex;
flex-direction: row;
justify-content: center;
align-items: stretch;
height: max-content;
}
opensearch-collapsible-panel {
display: flex;
flex-direction: column;
align-items: stretch;
justify-content: stretch;
width: 100%;
height: max-content;
}
opensearch-collapsible-panel > opensearch-toggle-button > opensearch-button > span.toggle-icon {
padding-top: 8px;
}
.list-items {
display: flex;
flex-direction: column;
align-items: stretch;
justify-content: flex-start;
width: 100%;
height: max-content;
padding: 0;
margin: 0;
box-sizing: border-box;
}
button {
width: 100%
}
</style>
<opensearch-collapsible-panel toggle-button-position="right">
<opensearch-toggle-button slot="toggle-slot">
<opensearch-button slot="toggled" icon-position="right" size="normal" class="example-toggle">
<span slot="icon-slot" class="toggle-icon">
<svg width="16" height="16" viewBox="0 0 16 16" xmlns="http://www.w3.org/2000/svg" class="ouiIcon ouiIcon--medium ouiIcon-isLoaded oui-alignMiddle" focusable="false" role="img" aria-hidden="true"><path fill-rule="non-zero" d="M13.069 5.157L8.384 9.768a.546.546 0 01-.768 0L2.93 5.158a.552.552 0 00-.771 0 .53.53 0 000 .759l4.684 4.61c.641.631 1.672.63 2.312 0l4.684-4.61a.53.53 0 000-.76.552.552 0 00-.771 0z"></path></svg>
</span>
<span slot="text-slot" class="selected-item-label">Select an item</span>
</opensearch-button>
<opensearch-button slot="untoggled" icon-position="right" size="normal" class="example-toggle">
<span slot="icon-slot" class="toggle-icon">
<svg width="16" height="16" viewBox="0 0 16 16" xmlns="http://www.w3.org/2000/svg" class="ouiIcon ouiIcon--medium ouiIcon-isLoaded oui-alignMiddle" focusable="false" role="img" aria-hidden="true"><path fill-rule="nonzero" d="M5.157 13.069l4.611-4.685a.546.546 0 000-.768L5.158 2.93a.552.552 0 010-.771.53.53 0 01.759 0l4.61 4.684c.631.641.63 1.672 0 2.312l-4.61 4.684a.53.53 0 01-.76 0 .552.552 0 010-.771z"></path></svg>
</span>
<span slot="text-slot" class="selected-item-label">Select an item</span>
</opensearch-button>
</opensearch-toggle-button>
<div slot="content-slot" class="list-items">
<slot></slot>
</div>
</opensearch-collapsible-panel>
</template>
<template id="opensearch_dropdown_item_element_tpl">
<style>
:host {
display: block;
width: 100%;
box-sizing: border-box;
margin: 0;
}
:host([selected]) {
background-color: #ccd3d6;
}
:host([disabled]) {
pointer-events: none;
opacity: 0.5;
}
.value {
display: none;
}
opensearch-button {
border: none;
}
opensearch-button:hover {
background-color: #ccd3d6;
}
</style>
<span class="value">
<slot name="value-slot"></slot>
</span>
<opensearch-button text-only label-text=" ">
<span slot="text-slot">
<slot name="label-slot"></slot>
</span>
</opensearch-button>
</template>
<template id="opensearch_dropdown_checkbox_item_element_tpl">
<style>
:host {
display: block;
width: 100%;
box-sizing: border-box;
margin: 0;
}
:host([selected]) {
background-color: #ccd3d6;
}
:host([disabled]) {
pointer-events: none;
opacity: 0.5;
}
:host > opensearch-toggle-button {
width: 100%;
}
:host > opensearch-toggle-button > opensearch-button {
border: none;
width: 100%;
}
:host > opensearch-toggle-button > opensearch-button:hover {
background-color: #ccd3d6;
}
</style>
<opensearch-toggle-button>
<opensearch-button slot="toggled" icon-position="left">
<span slot="icon-slot">
<svg width="16" height="16" viewBox="0 0 16 16" xmlns="http://www.w3.org/2000/svg" class="ouiIcon ouiIcon--medium ouiIcon-isLoaded oui-alignMiddle" focusable="false" role="img" aria-hidden="true"><path fill-rule="nonzero" d="M2.5 3.5h11a1 1 0 011 1v9a1 1 0 01-1 1h-11a1 1 0 01-1-1v-9a1 1 0 011-1zm0-1a2 2 0 00-2 2v9a2 2 0 002 2h11a2 2 0 002-2v-9a2 2 0 00-2-2h-11z"></path><path fill-rule="nonzero" d="M4.5 8.5l2 2 5-5"></path></svg>
</span>
<span slot="text-slot">
<slot name="label-slot"></slot>
</span>
</opensearch-button>
<opensearch-button slot="untoggled" icon-position="left">
<span slot="icon-slot">
<svg width="16" height="16" viewBox="0 0 16 16" xmlns="http://www.w3.org/2000/svg" class="ouiIcon ouiIcon--medium ouiIcon-isLoaded oui-alignMiddle" focusable="false" role="img" aria-hidden="true"><path fill-rule="nonzero" d="M2.5 3.5h11a1 1 0 011 1v9a1 1 0 01-1 1h-11a1 1 0 01-1-1v-9a1 1 0 011-1zm0-1a2 2 0 00-2 2v9a2 2 0 002 2h11a2 2 0 002-2v-9a2 2 0 00-2-2h-11z"></path></svg>
</span>
<span slot="text-slot">
<slot name="label-slot"></slot>
</span>
</opensearch-button>
</opensearch-toggle-button>
</template>
<script type="module">
class OpenSearchDropdownElement extends HTMLElement {
static get observedAttributes() {
return [
'orientation',
'expanded',
'unselected-label'
];
}
get selected() {
return this._selectedItem;
}
constructor() {
super();
this.attachShadow({mode: 'open'});
this.shadowRoot.appendChild(document.getElementById('opensearch_dropdown_element_tpl').content.cloneNode(true));
this.onItemSelect = this.onItemSelect.bind(this);
}
connectedCallback() {
const selectedItemLabel = this.getAttribute('unselected-label')?.trim?.() ?? 'Select an item';
if (!this.hasAttribute('unselected-label')) {
this.setAttribute('unselected-label', selectedItemLabel);
}
this.shadowRoot.querySelectorAll('.selected-item-label').forEach(label => label.textContent = selectedItemLabel);
this.setAttribute('role', 'listbox');
this.setAttribute('aria-role', 'list');
this.shadowRoot.querySelector('.list-items').addEventListener('click', this.onItemSelect);
}
disconnectCallback() {
this.shadowRoot.querySelector('.list-items').removeEventListener('click', this.onItemSelect);
}
onItemSelect(event) {
event.stopPropagation();
const findItemElement = (element) => {
if (!element) {
return null;
}
if (element instanceof OpenSearchDropdownItemElement) {
return element;
}
return findItemElement(element.parentElement);
};
const removeSelectedAttributeFromOtherItems = () => {
const items = this.shadowRoot.querySelector(
'opensearch-collapsible-panel'
)?.shadowRoot?.querySelector?.(
'slot[name="content-slot"]'
)?.assignedElements?.()?.[0]?.querySelector?.('slot')?.assignedElements?.()?.filter?.(
element => element instanceof OpenSearchDropdownItemElement
) ?? [];
items.forEach(item => {
if (item !== target) {
item.removeAttribute('selected');
item.removeAttribute('aria-selected');
}
});
};
const target = findItemElement(event.target);
if (!target) {
this.shadowRoot.querySelector('opensearch-collapsible-panel').removeAttribute('expanded');
return;
}
target.setAttribute('selected', true);
target.setAttribute('aria-selected', true);
removeSelectedAttributeFromOtherItems();
const selectedItemLabel = target.getAttribute('label');
const selectedItemValue = target.getAttribute('value');
const selectedItem = {
label: selectedItemLabel,
value: selectedItemValue,
};
this._selectedItem = selectedItem;
this.shadowRoot.querySelectorAll('.selected-item-label').forEach(label => label.textContent = selectedItemLabel);
this.dispatchEvent(new CustomEvent('item-select', {
detail: {
...selectedItem,
},
}));
this.shadowRoot.querySelector('opensearch-collapsible-panel').removeAttribute('expanded');
}
}
class OpenSearchDropdownItemElement extends HTMLElement {
static get observedAttributes() {
return ['value', 'label', 'selected', 'disabled', 'exclude-list'];
}
constructor(itemTemplate = 'opensearch_dropdown_item_element_tpl') {
super();
this.attachShadow({mode: 'open'});
this.shadowRoot.appendChild(document.getElementById(itemTemplate).content.cloneNode(true));
}
attributeChangedCallback(name, oldValue, newValue) {
if (name === 'label') {
this.applyLabelToButton();
}
if (name === 'selected') {
if (newValue === null) {
this.removeAttribute('aria-selected');
} else {
this.setAttribute('aria-selected', 'true');
}
}
if (name === 'disabled') {
if (newValue === null) {
this.removeAttribute('aria-disabled');
this.shadowRoot.querySelector('opensearch-button').removeAttribute('disabled');
} else {
this.setAttribute('aria-disabled', 'true');
this.shadowRoot.querySelector('opensearch-button').setAttribute('disabled', true);
}
}
}
connectedCallback() {
this.setAttribute('role', 'listitem');
this.setAttribute('aria-role', 'listitem');
if (this.hasAttribute('selected')) {
this.setAttribute('aria-selected', 'true');
}
if (this.hasAttribute('disabled')) {
this.setAttribute('aria-disabled', 'true');
this.shadowRoot.querySelector('opensearch-button').setAttribute('disabled', true);
}
this.applyLabelToButton();
}
applyLabelToButton() {
const label = this.getAttribute('label')?.trim?.() ?? '';
this.shadowRoot.querySelector('opensearch-button').setAttribute('label-text', label);
}
}
class OpenSearchDropdownCheckboxItemElement extends OpenSearchDropdownItemElement {
constructor() {
super('opensearch_dropdown_checkbox_item_element_tpl');
}
connectedCallback() {
super.connectedCallback();
}
disconnectCallback() {
super.disconnectCallback();
}
applyLabelToButton() {
const label = this.getAttribute('label')?.trim?.() ?? '';
this.shadowRoot.querySelectorAll('opensearch-button').forEach(button => button.setAttribute('label-text', label));
}
}
class OpenSearchMultiSelectDropdownElement extends OpenSearchDropdownElement {
constructor() {
super();
this.onItemSelect = this.onItemSelect.bind(this);
}
get selected() {
return this._selectedItems;
}
connectedCallback() {
super.connectedCallback();
this.setAttribute('aria-multiselectable', true);
this._selectedItems = [];
this.shadowRoot.querySelector('.list-items').addEventListener('click', this.onItemSelect);
}
disconnectCallback() {
super.disconnectCallback();
this.shadowRoot.querySelector('.list-items').removeEventListener('click', this.onItemSelect);
}
onItemSelect(event) {
event.stopPropagation();
const findItemElement = (element) => {
if (!element) {
return null;
}
if (element instanceof OpenSearchDropdownItemElement) {
return element;
}
return findItemElement(element.parentElement);
};
const target = findItemElement(event.target);
if (!target) {
this.shadowRoot.querySelector('opensearch-collapsible-panel').removeAttribute('expanded');
return;
}
const excludeList = target.getAttribute('exclude-list')?.split?.(',') ?? [];
const isSelected = target.toggleAttribute('selected');
excludeList.forEach((excludedValue) => {
const excludedItem = this.querySelector(`[value="${excludedValue}"]`);
if (excludedItem) {
if (isSelected) {
excludedItem.setAttribute('disabled', true);
excludedItem.setAttribute('aria-disabled', true);
if (excludedItem.hasAttribute('selected')) {
excludedItem.removeAttribute('selected');
excludedItem.removeAttribute('aria-selected');
const index = this._selectedItems.findIndex(item => item.value === excludedValue);
if (index !== -1) {
this._selectedItems.splice(index, 1);
}
// create the difference set between the excludeList and the exclude-list values of the excludedItem attribute value.
// Reenable the items in the difference set.
const excludedItemExcludeList = excludedItem.getAttribute('exclude-list').split(',');
const differenceSet = excludedItemExcludeList.filter(value => !excludeList.includes(value));
differenceSet.forEach((value) => {
const item = this.querySelector(`[value="${value}"]`);
if (item) {
item.removeAttribute('disabled');
item.removeAttribute('aria-disabled');
}
});
}
} else {
excludedItem.removeAttribute('disabled');
excludedItem.removeAttribute('aria-disabled');
}
}
});
target.toggleAttribute('aria-selected');
const selectedItemLabel = target.getAttribute('label');
const selectedItemValue = target.getAttribute('value');
const selectedItem = {
label: selectedItemLabel,
value: selectedItemValue,
};
const index = this._selectedItems.findIndex(item => item.value === selectedItemValue);
if (index === -1) {
this._selectedItems.push(selectedItem);
} else {
this._selectedItems.splice(index, 1);
}
const selectedItemsLabel = this._selectedItems.length > 0 ?
this._selectedItems.map(item => item.label).join(', ')
: this.getAttribute('unselected-label');
this.shadowRoot.querySelectorAll('.selected-item-label').forEach(
label => label.textContent = selectedItemsLabel
);
this.dispatchEvent(new CustomEvent('item-select', {
detail: {
...selectedItem,
selectedItems: this._selectedItems,
},
}));
}
}
customElements.define('opensearch-dropdown', OpenSearchDropdownElement);
customElements.define('opensearch-dropdown-item', OpenSearchDropdownItemElement);
customElements.define('opensearch-multi-select-dropdown', OpenSearchMultiSelectDropdownElement);
customElements.define('opensearch-dropdown-checkbox-item', OpenSearchDropdownCheckboxItemElement);
</script>