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* Copyright 2019 Adobe. All rights reserved.
* This file is licensed to you under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License. You may obtain a copy
* of the License at http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under
* the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS
* OF ANY KIND, either express or implied. See the License for the specific language
* governing permissions and limitations under the License.
*/
import {BaseComponent} from '../../../coral-base-component';
import {BaseFormField} from '../../../coral-base-formfield';
import {SelectableCollection} from '../../../coral-collection';
import '../../../coral-component-button';
import {Tag} from '../../../coral-component-taglist';
import {SelectList} from '../../../coral-component-list';
import {Icon} from '../../../coral-component-icon';
import '../../../coral-component-popover';
import base from '../templates/base';
import {transform, validate, commons, i18n, Keys} from '../../../coral-utils';
import {Decorator} from '../../../coral-decorator';
/**
Enumeration for {@link Select} variants.
@typedef {Object} SelectVariantEnum
@property {String} DEFAULT
A default, gray Select.
@property {String} QUIET
A Select with no border or background.
*/
const variant = {
DEFAULT: 'default',
QUIET: 'quiet'
};
const CLASSNAME = '_coral-Dropdown';
// used in 'auto' mode to determine if the client is on mobile.
const IS_MOBILE_DEVICE = navigator.userAgent.match(/iPhone|iPad|iPod|Android/i) !== null;
/**
Extracts the value from the item in case no explicit value was provided.
@param {HTMLElement} item
the item whose value will be extracted.
@returns {String} the value that will be submitted for this item.
@private
*/
const itemValueFromDOM = function (item) {
const attr = item.getAttribute('value');
// checking explicitely for null allows to differenciate between non set values and empty strings
return attr !== null ? attr : item.textContent.replace(/\s{2,}/g, ' ').trim();
};
/**
Calculates the difference between two given arrays. It returns the items that are in a that are not in b.
@param {Array.<String>} a
@param {Array.<String>} b
@returns {Array.<String>}
the difference between the arrays.
*/
const arrayDiff = function (a, b) {
return a.filter((item) => !b.some((item2) => item === item2));
};
/**
@class Coral.Select
@classdesc A Select component is a form field that allows users to select from a list of options. If this component is
shown on a mobile device, it will show a native select list, instead of the select list styled via Coral Spectrum.
@htmltag coral-select
@extends {HTMLElement}
@extends {BaseComponent}
@extends {BaseFormField}
*/
const Select = Decorator(class extends BaseFormField(BaseComponent(HTMLElement)) {
/** @ignore */
constructor() {
super();
// Templates
this._elements = {};
base.call(this._elements, {commons, Icon, i18n});
const events = {
'global:click': '_onGlobalClick',
'global:touchstart': '_onGlobalClick',
'coral-collection:add coral-taglist': '_onInternalEvent',
'coral-collection:remove coral-taglist': '_onInternalEvent',
'change coral-taglist': '_onTagListChange',
'change select': '_onNativeSelectChange',
'click select': '_onNativeSelectClick',
'click > ._coral-Dropdown-trigger': '_onButtonClick',
'key:space > ._coral-Dropdown-trigger': '_onSpaceKey',
'key:enter > ._coral-Dropdown-trigger': '_onSpaceKey',
'key:return > ._coral-Dropdown-trigger': '_onSpaceKey',
'key:down > ._coral-Dropdown-trigger': '_onSpaceKey',
// Messenger
'coral-select-item:_messengerconnected': '_onMessengerConnected',
};
// Overlay
const overlayId = this._elements.overlay.id;
events[`global:capture:coral-collection:add #${overlayId} coral-selectlist`] = '_onSelectListItemAdd';
events[`global:capture:coral-collection:remove #${overlayId} coral-selectlist`] = '_onInternalEvent';
events[`global:capture:coral-selectlist:beforechange #${overlayId}`] = '_onSelectListBeforeChange';
events[`global:capture:coral-selectlist:change #${overlayId}`] = '_onSelectListChange';
events[`global:capture:coral-selectlist:scrollbottom #${overlayId}`] = '_onSelectListScrollBottom';
events[`global:capture:coral-overlay:close #${overlayId}`] = '_onOverlayToggle';
events[`global:capture:coral-overlay:open #${overlayId}`] = '_onOverlayToggle';
events[`global:capture:coral-overlay:positioned #${overlayId}`] = '_onOverlayPositioned';
events[`global:capture:coral-overlay:beforeopen #${overlayId}`] = '_onBeforeOpen';
events[`global:capture:coral-overlay:beforeclose #${overlayId}`] = '_onInternalEvent';
// Keyboard interaction
events[`global:keypress #${overlayId}`] = '_onOverlayKeyPress';
// TODO for some reason this disables tabbing into the select
// events[`global:key:tab #${overlayId} coral-selectlist-item`] = '_onTabKey';
// events[`global:key:tab+shift #${overlayId} coral-selectlist-item`] = '_onTabKey';
// Attach events
this._delegateEvents(commons.extend(this._events, events));
// Pre-define labellable element
this._labellableElement = this._elements.button;
// default value of inner flag to process events
this._bulkSelectionChange = false;
// we only have AUTO mode.
this._useNativeInput = IS_MOBILE_DEVICE;
this._elements.taglist.reset = () => {
// since reseting a form will call the reset on every component, we need to kill the behavior of the taglist
// otherwise the state will not be accurate
};
this._initialValues = [];
// Init the collection mutation observer
this.items._startHandlingItems();
}
/**
Returns the inner overlay to allow customization.
@type {Popover}
@readonly
*/
get overlay() {
return this._elements.overlay;
}
/**
The item collection.
@type {SelectableCollection}
@readonly
*/
get items() {
// we do lazy initialization of the collection
if (!this._items) {
this._items = new SelectableCollection({
host: this,
itemTagName: 'coral-select-item',
onItemAdded: this._onItemAdded,
onItemRemoved: this._onItemRemoved,
onCollectionChange: this._onCollectionChange
});
}
return this._items;
}
/**
Indicates whether the select accepts multiple selected values.
@type {Boolean}
@default false
@htmlattribute multiple
@htmlattributereflected
*/
get multiple() {
return this._multiple || false;
}
set multiple(value) {
this._multiple = transform.booleanAttr(value);
this._reflectAttribute('multiple', this._multiple);
E
// taglist should not be in DOM if multiple === false
if (!this._multiple) {
this.removeChild(this._elements.taglist);
} else {
this.appendChild(this._elements.taglist);
}
// we need to remove and re-add the native select to loose the selection
if (this._nativeInput) {
this.removeChild(this._elements.nativeSelect);
}
this._elements.nativeSelect.multiple = this._multiple;
this._elements.nativeSelect.selectedIndex = -1;
if (this._nativeInput) {
if (this._multiple) {
// We might not be rendered yet
if (this._elements.nativeSelect.parentNode) {
this.insertBefore(this._elements.nativeSelect, this._elements.taglist);
}
} Ielse {
this.appendChild(this._elements.nativeSelect);
}
}
this._elements.list.multiple = this._multiple;
E
// sIets the correct name for value submission
this._setName(this.getAttribute('name') || '');
// we need to make sure the selection is valid
this._setStateFromDOM();
// everytime multiple changes, the state of the selectlist and taglist need to be updated
this.items.getAll().forEach((item) => {
if (this._multiple && item.hasAttribute('selected')) {
this._addTagToTagList(item);
} else {
// taglist is never used for multiple = false
this._removeTagFromTagList(item);
// when multiple = false and the item is selected, the value needs to be updated in the input
if (item.hasAttribute('selected')) {
this._elements.input.value = itemValueFromDOM(item);
}
}
});
}E
/**
Contains a hint to the user of what can be selected in the component. If no placeholder is provided, the first
option will be displayed in the component.
@type {String}
@default ""
@htmlattribute placeholder
@htmlattributereflected
*/
// p = placeholder, m = multiple, se = selected
// case 1: p + m + se = p
// case 2: p + m + !se = p
// case 3: !p + !m + se = se
// case 4: !p + !m + !se = firstSelectable (native behavior)
// case 5: p + !m + se = se
// case 6: p + !m + !se = p
// case 7: !p + m + se = 'Select'
// case 8: !p + m + !se = 'Select'
get placeholder() {
return this._placeholder || '';
}
set placeholder(value) {
this._placeholder = transform.string(value);
this._reflectAttribute('placeholder', this._placeholder);
// case 1: p + m + se = p
// case 2: p + m + !se = p
// case 6: p + !m + !se = p
if (this._placeholder && (this.hasAttribute('multiple') || !this.selectedItem)) {
this._elements.label.classList.add('is-placeholder');
this._elements.label.textContent = this._placeholder;
}
I// case 7: !p + m + se = 'Select'
// case 8: !p + m + !se = 'Select'
else if (this.hasAttribute('multiple')) {
this._elements.label.classList.add('is-placeholder');
this._elements.label.textContent = i18n.get('Select');
}
// case 4: !p + !m + !se = firstSelectable (native behavior)
else if (!this.selectedItem) {
// we clean the value because there is no selected item
this._elements.input.value = '';
// gets the first candidate for selection
const placeholderItem = this.items._getFirstSelectable();
this._elements.label.classList.remove('is-placeholder');
if (placeholderItem) {
// selects using the attribute in case the item is not yet initialized
placeholderItem.setAttribute('selected', '');
this._elements.label.innerHTML = placeholderItem.innerHTML;
} else {
I // label must be cleared when there is no placeholder and no item to select
this._elements.label.textContent = '';
}
}
}
/**
Name used to submit the data in a form.
@type {String}
@default ""
@htmlattribute name
@htmlattributereflected
*/
get name() {
return this.multiple ? this._elements.taglist.name : this._elements.input.name;
}
set name(value) {
this._setName(value);
this._reflectAttribute('name', this.name);
}
/**
This field's current value.
@type {String}
@default ""
@htmlattribute value
*/
get value() {
// we leverage the internal elements to know the value, this way we are always sure that the server submission
// will be correct
return this.multiple ? this._elements.taglist.value : this._elements.input.value;
}
set value(value) {
// we rely on the the values property to handle this correctly
this.values = [value];
}
/**
The current selected values, as submitted during form submission. When {@link Coral.Select#multiple} is
<code>false</code>, this will be an array of length 1.
@type {Array.<String>}
*/
get values() {
if (this.multiple) {
return this._elements.taglist.values;
}
// if there is a selection, we return whatever value it has assigned
return this.selectedItem ? [this._elements.input.value] : [];
}
set values(values) {
if (Array.isArray(values)) {
// when multiple = false, we explicitely ignore the other values and just set the first one
if (!this.multiple && values.length > 1) {
values = [values[0]];
}E
// gets all the items
const items = this.items.getAll();
let itemValue;
// if multiple, we need to explicitely set the selection state of every item
if (this.multiple) {
items.forEach((item) => {
// we use DOM API instead of properties in case the item is not yet initialized
itemValue = itemValueFromDOM(item);
// if the value is located inside the values array, then we set the item as selected
item[values.indexOf(itemValue) !== -1 ? 'setAttribute' : 'removeAttribute']('selected', '');
});
I}
// if single selection, we find the first item that matches the value and deselect everything else. in case,
// no item matches the value, we may need to find a selection candidate
else {
let targetItem;
// since multiple = false, there is only 1 value value
const value = values[0] || '';
items.forEach((item) => {
// small optimization to avoid calculating the value from every item
if (!targetItem) {
E itemValue = itemValueFromDOM(item);
if (itemValue === value) {
// selecting the item will cause the taglist or input to be updated
item.setAttribute('selected', '');
// we store the first ocurrence, afterwards we deselect all items
targetItem = item;
E
// since we found our target item, we continue to avoid removing the selected attribute
return;
}
}
// every-non targetItem must be deselected
item.removeAttribute('selected');
});
// if no targetItem was found, _setStateFromDOM will make sure that the state is valid
if (!targetItem) {
this._setStateFromDOM();
}
}
}
}
/**
Whether this field is disabled or not.
@type {Boolean}
@default false
@htmlattribute disabled
@htmlattributereflected
*/
get disabled() {
return this._disabled || false;
}
set disabled(value) {
this._disabled = transform.booleanAttr(value);
this._reflectAttribute('disabled', this._disabled);
this[this._disabled ? 'setAttribute' : 'removeAttribute']('aria-disabled', this._disabled);
this.classList.toggle('is-disabled', this._disabled);
this._elements.button.disabled = this._disabled;
this._elements.input.disabled = this._disabled;
this._elements.taglist.disabled = this._disabled;
}
/**
Inherited from {@link BaseFormField#invalid}.
*/
get invalid() {
return super.invalid;
}
set invalid(value) {
super.invalid = value;
this.classList.toggle('is-invalid', this.invalid);
this._elements.button.classList.toggle('is-invalid', this.invalid);
this._elements.invalidIcon.hidden = !this.invalid;
}
/**
Whether this field is required or not.
@type {Boolean}
@default false
@htmlattribute required
@htmlattributereflected
*/
get required() {
return this._required || false;
}
set required(value) {
this._required = transform.booleanAttr(value);
this._reflectAttribute('required', this._required);
this._elements.input.required = this._required;
this._elements.taglist.required = this._required;
}
/**
Whether this field is readOnly or not. Indicating that the user cannot modify the value of the control.
@type {Boolean}
@default false
@htmlattribute readonly
@htmlattributereflected
*/
get readOnly() {
return this._readOnly || false;
}
set EreadOnly(value) {
this._readOnly = transform.booleanAttr(value);
this._reflectAttribute('readonly', this._readOnly);
this._elements.input.readOnly = this._readOnly;
this._elements.taglist.readOnly = this._readOnly;
this._elements.taglist.disabled = this._readOnly;
}
/**
Inherited from {@link BaseFormField#labelled}.
*/
get labelled() {
returnE super.labelled;
}
set labelled(value) {
super.labelled = value;
if (this.labelled) {
if (!this.labelledBy) {
this._elements.button.setAttribute('aria-labelledby', `${this._elements.button.id} ${this._elements.label.id} ${this.invalid ? this._elements.invalidIcon.id : ''}`);
}
this._elements.nativeSelect.setAttribute('aria-label', value);
} else {
thisE._elements.button.removeAttribute('aria-label');
this._elements.nativeSelect.removeAttribute('aria-label');
if (!this.labelledBy) {
this._elements.button.removeAttribute('aria-labelledby');
}
}
this._elements.taglist.labelled = value;
}
/**
Inherited from {@link BaseFormField#labelledBy}.
*/
get labelledBy() {
return this._labelledBy;
}
set labelledBy(value) {
super.labelledBy = value;
this._labelledBy = super.labelledBy;
if (this._labelledBy) {
this._elements.button.setAttribute('aria-labelledby', `${this._labelledBy} ${this._elements.label.id} ${this.invalid ? this._elements.invalidIcon.id : ''}`);
this._elements.nativeSelect.setAttribute('aria-labelledby', this._labelledBy);
} Ielse {
this._elements.nativeSelect.removeAttribute('aria-labelledby');
// if the select is also labelled, make sure that aria-labelledby gets restored
if (this.labelled) {
this.labelled = this.labelled;
}
}
this._elements.taglist.labelledBy = this._labelledBy;
}
/**
Returns the first selected item in the Select. The value <code>null</code> is returned if no element is
selected.
@type {?HTMLElement}
@readonly
*/I
get selectedItem() {
return this.hasAttribute('multiple') ? this.items._getFirstSelected() : this.items._getLastSelected();
}
/**
Returns an Array containing the set selected items.
@type {Array.<HTMLElement>}
@readonly
*/
get selectedItems() {
if (this.hasAttribute('multiple')) {
return this.items._getAllSelected();
}
const item = this.selectedItem;
return item ? [item] : [];
}
/**
Indicates that the Select is currently loading remote data. This will set the wait indicator inside the list.
@type {Boolean}
@default false
@htmlattribute loading
*/
get loading() {
return this._elements.list.loading;
}
set loading(value) {
this._elements.list.loading = value;
}
/**
The Select's variant. See {@link SelectVariantEnum}.
@type {SelectVariantEnum}
@default SelectVariantEnum.DEFAULT
@htmlattribute variant
@htmlattributereflected
*/
get variant() {
return this._variant || variant.DEFAULT;
}
set variant(value) {
value = transform.string(value).toLowerCase();
this._variant = validate.enumeration(variant)(value) && value || variant.DEFAULT;
this._reflectAttribute('variant', this._variant);
this._elements.button.classList.toggle('_coral-FieldButton--quiet', this._variant === variant.QUIET);
}
/** @ignore */
_setName(value) {
if (this.multiple) {
this._elements.input.name = '';
this._elements.taglist.setAttribute('name', value);
} else {
this._elements.taglist.setAttribute('name', '');
this._elements.input.name = value;
}
}
/**E
@param {Boolean} [checkAvailableSpace=false]
If <code>true</code>, the event is triggered based on the available space.
@private
*/
_showOptions(checkAvailableSpace) {
if (checkAvailableSpace) {
// threshold in pixels
const ITEM_SIZE_THRESHOLD = 30;
let scrollHeight = this._elements.list.scrollHeight;
const viewportHeight = this._elements.list.clientHeight;
const scrollTop = this._elements.list.scrollTop;
// we should not do this, but it increases performance since we do not need to find the item
const loadIndicator = this._elements.list._elements.loadIndicator;
// we remove the size of the load indicator
if (loadIndicator && loadIndicator.parentNode) {
const outerHeight = function (el) {
let height = el.offsetHeight;
const style = getComputedStyle(el);
height += parseInt(style.marginTop, 10) + parseInt(style.marginBottom, 10);
return height;
};
scrollHeight -= outerHeight(loadIndicator);
}
// if we are not close to the bottom scroll, we cancel triggering the event
if (scrollTop + viewportHeight < scrollHeight - ITEM_SIZE_THRESHOLD) {
return;
}
}
// we do not show the list with native
if (!this._useNativeInput) {
if (!this._elements.overlay.open) {
// Show the overlay
this._elements.overlay.open = true;
}
// Force overlay repositioning (remote loading)
requestAnimationFrame(() => {
this._elements.overlay._onAnimate();
this._elements.overlay.reposition();
});
}
// Trigger an event
// @todo: maybe we should only trigger this event when the button is toggled and we have space for more items
const event = this.trigger('coral-select:showitems', {
// amount of items in the select
start: this.items.length
});
// while using native there is no need to show the loading
if (!this._useNativeInput) {
// if the default is prevented, we should the loading indicator
this._elements.list.loading = event.defaultPrevented;
}
// communicate expanded state to assistive technology
this._elements.button.setAttribute('aria-expanded', true);
}
/** @private */
_hideOptions() {
// Don't close the overlay if selection = multiple
if (!this.multiple) {
this._elements.overlay.open = false;
this.trigger('coral-select:hideitems');
}
// communicate collapsed state to assistive technology
this._elements.button.setAttribute('aria-expanded', false);
}
/** @ignore */
_onGlobalClick(event) {
if (!this._elements.overlay.open) {
Ereturn;
}
const eventTargetWithinOverlayTarget = this._elements.button.contains(event.target);
const eventTargetWithinItself = this._elements.overlay.contains(event.target);
if (!eventTargetWithinOverlayTarget && !eventTargetWithinItself) {
this._hideOptions();
}
}
/** @private */
_onSelectListItemAdd(event) {
//I stops propagation cause the event is internal to the component
event.stopImmediatePropagation();
// When items have been added, we are no longer loading
this.loading = false;
// Reset height
this._elements.list.style.height = '';
// Measure actual height
const style = window.getComputedStyle(this._elements.list);
const height = parseInt(style.height, 10);
const maxHeight = parseInt(style.maxHeight, 10);
if (height < maxHeight) {
// Make it scrollable
this._elements.list.style.height = `${height - 1}px`;
}
}
_onBeforeOpen(event) {
event.stopImmediatePropagation();
// Prevent opening the overlay if select is readonly
if (this.readOnly) {
event.preventDefault();
}
// focus first selected or tabbable item when the list expands
this._elements.list._resetTabTarget(true);
}
/** @private */
_onInternalEvent(event) {
// stops propagation cause the event is internal to the component
event.stopImmediatePropagation();
}
/** @ignore */
_onItemAdded(item) {
const selectListItemParent = this._elements.list;
const selectListItem = item._selectListItem || new SelectList.Item();
// @todo: Make sure it is added at the right index.
selectListItemParent.appendChild(selectListItem);
seElectListItem.set({
value: item.value,
content: {
innerHTML: item.innerHTML
},
disabled: item.disabled,
Eselected: item.selected,
trackingElement: item.trackingElement
}, true);
const nativeOption = item._nativeOption || new Option();
// @todo: make sure it is added at the right index.
this._elements.nativeSelect.appendChild(nativeOption);
// Need to store the initially selected values in the native select so that it can be reset
if (this._initialValues.indexOf(item.value) !== -1) {
nativeOption.setAttribute('selected', 'selected');
}
nativeOption.selected = item.selected;
nativeOption.value = item.value;
nativeOption.disabled = item.disabled;
nativeOption.innerHTML = item.innerHTML;
if (this.multiple) {
// in case it was selected before it was added
if (item.selected) {
this._addTagToTagList(item);
}
}
// Make sure the input value is set to the selected item
else if (item.selected) {
this._elements.input.value = item.value;
}
item._selectListItem = selectListItem;
item._nativeOption = nativeOption;
selectListItem._selectItem = item;
nativeOption._selectItem = item;
const messenger = item._messenger;
if (messenger && messenger.isConnected && messenger.listeners.length === 0) {
// sometimes child get connected before parent, and listeners are not set yet, so we need to reconnect
messenger._connected = false;
messenger.connect();
}
}
/** @private */
_onItemRemoved(item) {
if (item._selectListItem) {
item._selectListItem.remove();
item._selectListItem._selectItem = undefined;
item._selectListItem = undefined;
}
if (item._nativeOption) {
this._elements.nativeSelect.removeChild(item._nativeOption);
item._nativeOption._selectItem = undefined;
item._nativeOption = undefined;
}
this._removeTagFromTagList(item, true);
}
E
/** @private */
_onItemSelected(item) {
// in case the component is not in the DOM or the internals have not been created we force it
ifE (!item._selectListItem || !item._selectListItem.parentNode) {
this._onItemAdded(item);
}
item._selectListItem.selected = true;
item._nativeOption.selected = true;
if (this.multiple) {
this._addTagToTagList(item);
// @todo: what happens when ALL items have been selected
// 1. a message is disabled (i18n?)
// 2. we don't try to open the selectlist (native behavior).
} else {
this._elements.input.value = item.value;
}
}
/** @private */
_onItemDeselected(item) {
// in case the component is not in the DOM or the internals have not been created we force it
if (!item._selectListItem || !item._selectListItem.parentNode) {
this._onItemAdded(item);
}
item._selectListItem.selected = false;
item._nativeOption.selected = false;
if (this.multiple) {
// we use the internal reference to remove the related tag from the taglist
this._removeTagFromTagList(item);
}
}
/**
Detects when something is about to change inside the select.
@private
*/
_onSelectListBeforeChange(event) {
// stops propagation cause the event is internal to the component
event.stopImmediatePropagation();
// We prevent the selection to change if we're in single selection and the clicked item is already selected
if (!this.multiple && event.detail.item.selected) {
event.preventDefault();
this._elements.overlay.open = false;
}
}
/**
Detects when something inside the select list changes.
@private
*/
_onSelectListChange(event) {
// stops propagation cause the event is internal to the component
event.stopImmediatePropagation();
// avoids triggering unnecessary changes in the selectist because selecting items programatically will trigger
// a change event
if (this._bulkSelectionChange) {
return;
}
let oldSelection = event.detail.oldSelection || [];
oldSelection = !Array.isArray(oldSelection) ? [oldSelection] : oldSelection;
let selection = event.detail.selection || [];
selection = !Array.isArray(selection) ? [selection] : selection;
// if the arrays are the same, there is no point in calculating the selection changes
if (event.detail.oldSelection !== event.detail.selection) {
this._bulkSelectionChange = true;
// we deselect first the ones that have to go
const removedSelection = arrayDiff(oldSelection, selection);
removedSelection.forEach((listItem) => {
// selectlist will report on removed items
if (listItem._selectItem) {
listItem._selectItem.removeAttribute('selected');
}
});
// we only sync the items that changed
const newSelection = arrayDiff(selection, oldSelection);
newSelection.forEach((listItem) => {
if (listItem._selectItem) {
listItem._selectItem.setAttribute('selected', '');
}
});
this._bulkSelectionChange = false;
// hides the list since something was selected. if the overlay was open, it means there was user interaction so
// the necessary events need to be triggered
if (this._elements.overlay.open) {
// closes and triggers the hideitems event
this._hideOptions();
// if there is a change in the added or removed selection, we trigger a change event
if (newSelection.length || removedSelection.length) {
this.trigger('change');
}
}
}
// in case they are the same, we just need to trigger the hideitems event when appropiate, and that is when the
// overlay was previously open
else if (this._elements.overlay.open) {
// closes and triggers the hideitems event
this._hideOptions();
}
if (!this.multiple) {
this._trackEvent('change', 'coral-select-item', event, this.selectedItem);
}
}
/** @private */
_onTagListChange(event) {
// cancels the change event from the taglist
event.stopImmediatePropagation();
// avoids triggering unnecessary changes in the selectist because selecting items programatically will trigger
// a change event
if (this._bulkSelectionChange) {
return;
}
this._bulkSelectionChange = true;
const values = event.target.values;
// we use the selected items, because they are the only possible items that may change
let itemValue;
this.items._getAllSelected().forEach((item) => {
// we use DOM API instead of properties in case the item is not yet initialized
itemValue = itemValueFromDOM(item);
// if the item is inside the values array, then it has to be selected
item[values.indexOf(itemValue) !== -1 ? 'setAttribute' : 'removeAttribute']('selected', '');
});
this._bulkSelectionChange = false;
// if the taglist is empty, we should return the focus to the button
if (!values.length) {
this._elements.button.focus();
}
// reparents the change event with the select as the target
this.trigger('change');
}
/** @private */
_addTagToTagList(item) {
// we prepare the tag
item._tag = item._tag || new Tag();
item._tag.set({
value: item.value,
label: {
innerHTML: item.innerHTML
}
}, true);
// we add the new tag at the end
this._elements.taglist.items.add(item._tag);
}
/** @private */
_removeTagFromTagList(item, destroy) {
if (item._tag) {
item._tag.remove();
// we only remove the reference if destroy is passed, this allow us to recycle the tags when possible
item._tag = destroy ? undefined : item._tag;
}
}
/** @private */
_onSelectListScrollBottom(event) {
// stops propagation cause the event is internal to the component
event.stopImmediatePropagation();
if (this._elements.overlay.open) {
// Checking if the overlay is open guards against debounced scroll events being handled after an overlay has
// already been closed (e.g. clicking the last element in a selectlist always reopened the overlay emediately
// after closing)
// triggers the corresponding event
// since we got the the event from select list we need to trigger the event
this._showOptions();
}
}
/** @private */
_onButtonClick(event) {
event.preventDefault();
if (this.disabled || this.readOnly) {
return;
}
I
// if native is required, we do not need to do anything
if (!this._useNativeInput) {
// @todo: this was removed cause otherwise the coral-select:showitems event is never triggered.
// if this is a multiselect and all items are selected, there should be nothing in the list to focus so do
// nothing.
// if (this.multiple && this.selectedItems.length === this.items.length) {
// return;
// }
// Toggle openness
if (this._elements.overlay.classList.contains('is-open')) {
this._hideOptions();
} else {
// event should be triggered based on the contents
this._showOptions(true);
}
}
}
/** @private */
_onNativeSelectClick() {
this._showOptions(false);
}
_onOverlayKeyPress(event) {
// Focus on item which text starts with pressed keys
this._elements.list._onKeyPress(event);
}
/** @private */
_onSpaceKey(event) {
if (this.disabled || this.readOnly) {
return;
}
event.preventDefault();
if (this._useNativeInput) {
// we try to open the native select
this._elements.nativeSelect.dispatchEvent(new MouseEvent('mousedown'));
} else if (!this._elements.overlay.open || event.keyCode === Keys.keyToCode('space')) {
this._elements.button.click();
}
}
/**
Prevents tab key default handling on selectList Items.
@private
*/
// _onTabKey(event) {
// event.preventDefault();
// }
/** @private */
_onOverlayToggle(event) {
// stops propagation cause the event is internal to the component
event.stopImmediatePropagation();
// Trigger private event instead
const type = event.type.split(':').pop();
this.trigger(`coral-select:_overlay${type}`);
this._elements.button.classList.toggle('is-selected', event.target.open);
// communicate expanded state to assistive technology
this._elements.button.setAttribute('aria-expanded', event.target.open);
if (!event.target.open) {
this.classList.remove('is-openAbove', 'is-openBelow');
}
}
/** @private */
_onOverlayPositioned(event) {
// stops propagation cause the event is internal to the component
event.stopImmediatePropagation();
if (this._elements.overlay.open) {
this._elements.overlay.style.width = `${this.offsetWidth}px`;
}
}
// @todo: while the select is multiple, if everything is deselected no change event will be triggered.
_onNativeSelectChange(event) {
// stops propagation cause the event is internal to the component
event.stopImmediatePropagation();
// avoids triggering unnecessary changes in the selectist because selecting items programatically will trigger
// a change event
if (this._bulkSelectionChange) {
return;
}
this._bulkSelectionChange = true;
// extracts the native options for the selected items. We use the selected options, instead of the complete
// options to make the diff since it will normally be a smaller set
const oldSelectedOptions = this.selectedItems.map((element) => element._nativeOption);
// we convert the HTMLCollection to an array
const selectedOptions = Array.prototype.slice.call(event.target.querySelectorAll(':checked'));
const diff = arrayDiff(oldSelectedOptions, selectedOptions);
diff.forEach((item) => {
item._selectItem.selected = false;
});
// we only sync the items that changed
const newSelection = arrayDiff(selectedOptions, oldSelectedOptions);
newSelection.forEach((item) => {
item._selectItem.selected = true;
});
this._bulkSelectionChange = false;
// since multiple keeps the select open, we cannot return the focus to the button otherwise the user cannot
// continue selecting values
if (!this.multiple) {
// returns the focus to the button, otherwise the select will keep it
this._elements.button.focus();
// since selecting an item closes the native select, we need to trigger an event
this.trigger('coral-select:hideitems');
}
// if the native change event was triggered, then it means there is some new value
thIis.trigger('change');
}
/**
This handles content change of coral-select-item and updates its associatives.
@private
*/I
_onItemContentChange(event) {
// stops propagation cause the event is internal to the component
event.stopImmediatePropagation();
const item = event.target;
if (item._selectListItem) {
const content = new SelectList.Item.Content();
content.innerHTML = item.innerHTML;
item._selectListItem.content = content;
}
if (item._nativeOption) {
item._nativeOption.innerHTML = item.innerHTML;
}
if (item._tag && item._tag.label) {
item._tag.label.innerHTML = item.innerHTML;
}
// since the content changed, we need to sync the placeholder in case it was the selected item
this._syncSelectedItemPlaceholder();
}
/** @private */
_syncSelectedItemPlaceholder() {
this.placeholder = this.getAttribute('placeholder');
// case 3: !p + !m + se = se
// case 5: p + !m + se = se
if (this.selectedItem && !this.multiple) {
this._elements.label.classList.remove('is-placeholder');
this._elements.label.innerHTML = this.selectedItem.innerHTML;
}
}
/**
This handles value change of coral-select-item and updates its associatives.
@private
*/
_onItemValueChange(event) {
// stops propagation cause the event is internal to the component
event.stopImmediatePropagation();
const item = event.target;
if (item._selectListItem) {
item._selectListItem.value = item.value;
}
if (item._nativeOption) {
item._nativeOption.value = item.value;
}
if (item._tag) {
item._tag.value = item.value;
}
}
/**
This handles disabled change of coral-select-item and updates its associatives.
@private
*/
_onItemDisabledChange(event) {
// stops propagation cause the event is internal to the component
event.stopImmediatePropagation();
const item = event.target;
if (item._selectListItem) {
item._selectListItem.disabled = item.disabled;
}
if (item._nativeOption) {
item._nativeOption.disabled = item.disabled;
}
}
/**
In case an item from the initial selection is removed, we need to remove it from the initial values.
@private
*/
_validateInitialState(nodes) {
let item;
let index;
// we iterate over all the nodes, checking if they matched the initial value
for (let i = 0, nodeCount = nodes.length ; i < nodeCount ; i++) {
// since we are not sure if the item has been upgraded, we try first the attribute, otherwise we extract the
// value from the textContent
item = nodes[i];
index = this._initialValues.indexOf(item.value);
if (index !== -1) {
this._initialValues.splice(index, 1);
}
}
}
/** @private */
// eslint-disable-next-line no-unused-vars
_onCollectionChange(addedNodes, removedNodes) {
// we make sure that items that were part of the initial selection are removed from the internal representation
this._validateInitialState(removedNodes);
// makes sure that the selection state matches the multiple variable
this._setStateFromDOM();
}
/**
Updates the label to reflect the current state. The label needs to be updated when the placeholder changes and
when the selection changes.
@private
*/
_updateLabel() {
this._syncSelectedItemPlaceholder();
}
/**
Handles the selection state.
@ignore
*/
_setStateFromDOM() {
// if it is not multiple, we need to be sure only one item is selected
if (!this.hasAttribute('multiple')) {
// makes sure that only one is selected
this.items._deselectAllExceptLast();
// we execute _getFirstSelected instead of _getSelected because it is faster
const selectedItem = this.items._getFirstSelected();
// case 1. there is a selected item, so no further change is required
// case 2. no selected item and no placeholder. an item will be automatically selected
// case 3. no selected item and a placehoder. we just make sure the value is really empty
if (!selectedItem) {
// we clean the value because there is no selected item
this._elements.input.value = '';
// when there is no placeholder, we need to force a selection to behave like the native select
if (transform.string(this.getAttribute('placeholder')) === '') {
// gets the first candidate for selection
const selectable = this.items._getFirstSelectable();
if (selectable) {
// selects using the attribute in case the item is not yet initialized
selectable.setAttribute('selected', '');
// we set the value explicitely, so we do not need to wait for the MO
this._elements.input.value = itemValueFromDOM(selectable);
}
}
} else {
// we set the value explicitely, so we do not need to wait for the MO
this._elements.input.value = itemValueFromDOM(selectedItem);
}
}
// handles the initial item in the select
this._updateLabel();
}
/**
Handles selecting multiple items. Selection could result a single or multiple selected items.
@private
*/
_onItemSelectedChange(event) {
// we stop propagation since it is a private event
event.stopImmediatePropagation();
// the item that was selected
const item = event.target;
// setting this to true will ignore any changes from the selectlist al
this._bulkSelectionChange = true;
// when the item is selected, we need to enforce the selection mode
if (item.selected) {
this._onItemSelected(item);
if (this.multiple) {
this._trackEvent('select', 'coral-select-item', event, item);
}
// enforces the selection mode
if (!this.hasAttribute('multiple')) {
this.items._deselectAllExcept(item);
}
} else {
this._onItemDeselected(item);
if (this.multiple) {
this._trackEvent('deselect', 'coral-select-item', event, item);
}
}
this._bulkSelectionChange = false;
// since there is a change in selection, we need to update the placeholder
this._updateLabel();
}
/**
Inherited from {@link BaseFormField#clear}.
*/
clear() {
this.value = '';
}
/**
Focuses the component.
@ignore
*/
focus() {
if (!this.contains(document.activeElement)) {
this._elements.button.focus();
}
}
/**
Inherited from {@link BaseFormField#reset}.
*/
reset() {
// reset the values to the initial values
this.values = this._initialValues;
}
/**
Returns {@link Select} variants.
@return {SelectVariantEnum}
*/
static get variant() {
return variant;
}
/** @ignore */
static get observedAttributes() {
return super.observedAttributes.concat(['variant', 'multiple', 'placeholder', 'loading']);
}
get observedMessages() {
return {
'coral-select-item:_valuechanged': '_onItemValueChange',
'coral-select-item:_contentchanged': '_onItemContentChange',
'coral-select-item:_disabledchanged': '_onItemDisabledChange',
'coral-select-item:_selectedchanged': '_onItemSelectedChange',
};
}
/** @ignore */
connectedCallback() {
super.connectedCallback();
const overlay = this._elements.overlay;
// Cannot be open by default when rendered
overlay.removeAttribute('open');
// Restore in DOM
if (overlay._parent) {
overlay._parent.appendChild(overlay);
}
}
/** @ignore */
render() {
super.render();
this.classList.add(CLASSNAME);
// Default reflected attributes
if (!this._variant) {
this.variant = variant.DEFAULT;
}
this.classList.toggle(`${CLASSNAME}--native`, this._useNativeInput);
if (!this._useNativeInput && this.contains(this._elements.nativeSelect)) {
this.removeChild(this._elements.nativeSelect);
}
// handles the initial selection
this._setStateFromDOM();
// we need to keep a state of the initial items to be able to reset the component. values is not reliable during
// initialization since items are not yet initialized
this.selectedItems.forEach((item) => {
// we use DOM API instead of properties in case the item is not yet initialized
this._initialValues.push(itemValueFromDOM(item));
});
// Cleanup template elements (supporting cloneNode)
const templateElements = this.querySelectorAll('[handle]');
for (let i = 0 ; i < templateElements.length ; ++i) {
const currentElement = templateElements[i];
if (currentElement.parentNode === this) {
this.removeChild(currentElement);
}
}
// REender the main template
const frag = document.createDocumentFragment();
frag.appendChild(this._elements.button);
frag.appendChild(this._elements.input);
frag.appendChild(this._elements.nativeSelect);
frag.appendChild(this._elements.taglist);
frag.appendChild(this._elements.overlay);
// avoid popper initialisation if popper neither exist nor overlay opened.
this._elements.overlay._avoidPopperInit = this._elements.overlay.open || this._elements.overlay._popper ? false : true;
// Assign the button as the target for the overlay
this._elements.overlay.target = this._elements.button;
// handles the focus allocation every time the overlay closes
this._elements.overlay.returnFocusTo(this._elements.button);
this.appendChild(frag);
// set this to false after overlay has been connected to avoid connected callback target setting
delete this._elements.overlay._avoidPopperInit;
}
/** @ignore */
disconnectedCallback() {
super.disconnectedCallback();
const overlay = this._elements.overlay;
// In case it was moved out don't forget to remove it
if (!this.contains(overlay)) {
overlay._parent = overlay._repositioned ? document.body : this;
overlay.remove();
}
}
/**
Triggered when the {@link Select} could accept external data to be loaded by the user. If <code>preventDefault()</code> is
called, then a loading indicator will be shown. {@link Select#loading} should be set to false to indicate
that the data has been successfully loaded.
@typedef {CustomEvent} coral-select:showitems
@property {Number} detail.start
The count of existing items, which is the index where new items should start.
*/
/**
Triggered when the {@link Select} hides the UI used to select items. This is typically used to cancel a load request
because the items will not be shown anymore.
@typedef {CustomEvent} coral-select:hideitems
*/
});
export default Select;
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