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/** |
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* Implements the x-select directive |
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* @param {import('alpinejs').default} Alpine |
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*/ |
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export default Alpine => { |
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Alpine.data('_selectImplementation', () => { |
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return { |
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$select: null, |
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|
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// Props |
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get props() { |
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return this.$data.$select?.props ?? {} |
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}, |
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|
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// Data |
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touched: false, |
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activatedIndex: undefined, |
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keyPressed: false, |
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expanded: false, |
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positioningStyles: {}, |
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positionClasses: [], |
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listboxOverlapsTrigger: false, |
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valueOnOpen: undefined, |
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//animatingListbox: false, |
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|
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// Computed |
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get listboxVisible() { |
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return this.$data.expanded // || this.$data.animatingListbox |
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}, |
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get valueArray() { |
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return this.$data.props.multiple |
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? this.$data.props.modelValue |
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: [this.$data.props.modelValue] |
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}, |
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get idPrefix() { |
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return this.$data.props.id |
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}, |
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get idListbox() { |
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return `${this.$data.idPrefix}-listbox` |
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}, |
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get idTrigger() { |
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return `${this.$data.idPrefix}-trigger` |
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}, |
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get hasSelected() { |
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return this.$data.props.multiple |
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? this.$data.props.selectedOption.length > 0 |
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: typeof this.$data.props.selectedOption !== 'undefined' |
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}, |
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get firstSelectedOptionIndex() { |
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return this.$data.hasSelected |
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? this.$data.props.options.indexOf( |
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this.$data.props.multiple |
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? this.$data.props.selectedOption[0] |
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: this.$data.props.selectedOption, |
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) |
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: undefined |
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}, |
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getPlaceholder(option) { |
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const placeholderValue = this.$data.props.placeholder |
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if (!this.$data.hasSelected) return placeholderValue.trim() || '\u00A0' |
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|
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if (this.$data.props.multiple) { |
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return this.$data.props.selectedOption.map(option => option.label).join(', ') |
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} else { |
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return this.$data.props.selectedOption.label |
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} |
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}, |
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get hasActivatedItem() { |
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return typeof this.$data.activatedIndex === 'number' |
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}, |
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get activatedOption() { |
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return !this.$data.hasActivatedItem |
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? undefined |
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: this.$data.props.options[this.$data.activatedIndex] |
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}, |
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get activatedId() { |
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return !this.$data.hasActivatedItem ? undefined : this.$data.activatedOption.id |
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}, |
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// Functions |
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pressKey(key) { |
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this.$data.keyPressed = key |
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setTimeout(() => { |
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this.$data.keyPressed = false |
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}, 0) |
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}, |
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scrollListbox({ direction = 'auto', index = this.$data.activatedIndex } = {}) { |
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let hasSelected = typeof index === 'number' |
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let listbox = this.$refs.listbox |
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if (!listbox) return |
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|
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let listboxRect = listbox.getBoundingClientRect() |
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let listboxTriggerRect = this.$refs.listboxTrigger.getBoundingClientRect() |
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let listboxItem = listbox.children[index] |
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let previousItem = listbox.children[index - 1] ?? listboxItem |
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let nextItem = listbox.children[index + 1] ?? listboxItem |
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let previousItemRect = previousItem.getBoundingClientRect() |
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let nextItemRect = nextItem.getBoundingClientRect() |
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|
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if (direction === 'auto' && this.$data.listboxOverlapsTrigger && hasSelected) { |
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let diff = listboxTriggerRect.top - listboxRect.top |
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let top = listboxItem.offsetTop - diff |
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listbox.scrollTo({ top }) |
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} else if ( |
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direction === 'down' && |
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nextItemRect.bottom + listboxTriggerRect.height > listboxRect.bottom |
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) { |
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listbox.scrollTo({ |
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top: |
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index === this.$data.props.options.length - 1 |
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? listbox.scrollHeight |
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: nextItem.offsetTop + nextItemRect.height - listboxRect.height, |
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behavior: 'smooth', |
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}) |
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} else if ( |
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direction === 'up' && |
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previousItemRect.top - listboxTriggerRect.height < listboxRect.top |
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) { |
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listbox.scrollTo({ |
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top: index === 0 ? 0 : previousItem.offsetTop, |
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behavior: 'smooth', |
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}) |
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} |
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}, |
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calculatePosition() { |
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let listbox = this.$refs.listbox |
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let listboxTrigger = this.$refs.listboxTrigger |
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if (!listbox || !listboxTrigger) return |
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let screenWidth = Math.min(window.innerWidth, window.outerWidth) |
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let screenHeight = window.innerHeight |
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let listboxRect = listbox.getBoundingClientRect() |
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let listboxTriggerRect = listboxTrigger.getBoundingClientRect() |
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let spaceBelowTrigger = screenHeight - listboxTriggerRect.bottom |
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let spaceAboveTrigger = listboxTriggerRect.top |
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let listboxTooTall = listboxRect.bottom > screenHeight |
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let listboxTooWide = listboxRect.right > screenWidth |
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let listboxTooWideForTrigger = listboxRect.width > listboxTriggerRect.width |
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let localPositioningStyles = {} |
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let localPositionClasses = [] |
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|
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if (listboxTooTall) { |
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if (spaceAboveTrigger > spaceBelowTrigger && spaceAboveTrigger > listboxRect.height) { |
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localPositioningStyles[ |
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'--multiselect--position-bottom' |
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] = `${listboxTriggerRect.height}px` |
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localPositionClasses = ['from-bottom'] |
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} else if (spaceAboveTrigger > spaceBelowTrigger) { |
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localPositioningStyles['--multiselect--position-bottom'] = `${Math.round( |
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listboxTriggerRect.bottom - screenHeight, |
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)}px` |
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localPositionClasses = ['from-bottom'] |
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this.$data.listboxOverlapsTrigger = true |
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} else { |
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localPositioningStyles['--multiselect--position-top'] = `${Math.round( |
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-listboxTriggerRect.top, |
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)}px` |
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localPositionClasses = ['from-top'] |
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this.$data.listboxOverlapsTrigger = true |
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} |
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} else { |
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localPositionClasses = ['from-none'] |
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} |
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if (listboxTooWideForTrigger) { |
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localPositionClasses.push('is-too-wide-for-trigger') |
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} |
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if (listboxTooWide) { |
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localPositionClasses.push('is-too-wide-for-screen') |
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} |
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this.$data.positionClasses = localPositionClasses |
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this.$data.positioningStyles = localPositioningStyles |
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}, |
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activate(index) { |
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if (index < 0) return |
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if (index >= this.$data.props.options.length) return |
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this.$data.activatedIndex = index |
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}, |
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activateFirst() { |
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this.$data.activate(0) |
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}, |
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activateLast() { |
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this.$data.activate(this.$data.props.options.length - 1) |
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}, |
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activateFirstSelected() { |
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if (this.$data.hasSelected) { |
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this.$data.activate(this.$data.firstSelectedOptionIndex) |
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} else { |
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this.$data.activateFirst() |
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} |
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}, |
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activatePrevious() { |
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if (!this.$data.hasActivatedItem) { |
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this.$data.activateLast() |
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} else { |
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this.$data.activate(this.$data.activatedIndex - 1) |
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} |
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}, |
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activateNext() { |
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if (!this.$data.hasActivatedItem) { |
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this.$data.activateFirst() |
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} else { |
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this.$data.activate(this.$data.activatedIndex + 1) |
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} |
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}, |
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open() { |
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this.$data.valueOnOpen = this.$data.props.modelValue |
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this.$data.expanded = true |
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}, |
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close() { |
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this.$data.touched = true |
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if (this.$refs.listbox?.matches(':focus')) { |
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this.$refs.listboxTrigger.focus({ preventScroll: true }) |
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} |
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this.$data.expanded = false |
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this.$data.$select.el.dispatchEvent(new CustomEvent('select:close', { bubbles: true })) |
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if ( |
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JSON.stringify(this.$data.valueOnOpen) !== JSON.stringify(this.$data.props.modelValue) |
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) { |
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this.$data.$select.el.dispatchEvent( |
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new CustomEvent('select:change', { |
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bubbles: true, |
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detail: { |
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value: this.$data.props.modelValue, |
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}, |
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}), |
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) |
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} |
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}, |
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select(value) { |
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this.$data.$select.setValue(value) |
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this.$data.$select.el.dispatchEvent( |
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new CustomEvent('select:input', { |
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bubbles: true, |
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detail: { |
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value, |
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}, |
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}), |
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) |
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}, |
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selectSingle(value) { |
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this.$data.select(this.$data.props.multiple ? [value] : value) |
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}, |
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selectSingleAndClose(value) { |
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this.$data.select(value) |
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this.$data.close() |
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}, |
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toggle(value) { |
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const currentValue = this.$data.props.modelValue |
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if (currentValue.includes(value)) { |
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this.$data.$select.setValue(currentValue.filter(selectedValue => selectedValue !== value)) |
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} else { |
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this.$data.$select.setValue([...currentValue, value]) |
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} |
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}, |
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commitSingleValue(value) { |
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if (this.$data.props.multiple) { |
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this.$data.toggle(value) |
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} else { |
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this.$data.selectSingleAndClose(value) |
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} |
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}, |
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onListboxKeydown(event) { |
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switch (event.key) { |
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case 'Escape': |
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event.preventDefault() |
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this.$data.pressKey(event.key) |
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this.$data.close() |
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break |
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|
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case 'ArrowDown': |
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event.preventDefault() |
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this.$data.pressKey(event.key) |
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this.$data.activateNext() |
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break |
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|
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case 'ArrowUp': |
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event.preventDefault() |
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this.$data.pressKey(event.key) |
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this.$data.activatePrevious() |
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break |
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case 'Home': |
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event.preventDefault() |
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this.$data.pressKey(event.key) |
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this.$data.activateFirst() |
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break |
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case 'End': |
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event.preventDefault() |
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this.$data.pressKey(event.key) |
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this.$data.activateLast() |
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break |
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|
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case 'Enter': |
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case ' ': |
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event.preventDefault() |
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this.$data.pressKey(event.key) |
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if (!this.$data.hasActivatedItem) { |
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this.$data.close() |
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break |
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} |
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if (this.$data.props.multiple) { |
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this.$data.toggle(this.$data.activatedOption.value) |
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} else { |
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this.$data.selectSingleAndClose(this.$data.activatedOption.value) |
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} |
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break |
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} |
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}, |
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// Initialize |
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init() { |
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this.$watch('$data?.$select?.props?.disabled', disabled => { |
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if (disabled) { |
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this.$data.close() |
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} |
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}) |
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this.$watch('listboxVisible', visible => { |
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if (!visible) { |
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this.$data.positioningStyles = {} |
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this.$data.positionClasses = [] |
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this.$data.listboxOverlapsTrigger = false |
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} |
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}) |
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this.$watch('expanded', expanded => { |
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if (!expanded) { |
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this.$data.activatedIndex = undefined |
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} else { |
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this.$data.activateFirstSelected() |
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let index = this.$data.hasSelected ? this.$data.firstSelectedOptionIndex : 0 |
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|
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Alpine.nextTick(() => { |
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this.$data.calculatePosition() |
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|
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setTimeout(() => { |
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this.$refs.listbox.focus({ preventScroll: true }) |
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this.$data.scrollListbox({ index }) |
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}, 0) |
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}) |
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} |
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}) |
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this.$watch('activatedIndex', (activatedIndex, oldActivatedIndex) => { |
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if (this.$data.hasActivatedItem && this.$data.keyPressed) { |
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this.$data.scrollListbox({ |
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direction: (activatedIndex ?? 0) > (oldActivatedIndex ?? 0) ? 'down' : 'up', |
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}) |
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} |
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}) |
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}, |
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} |
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}) |
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Alpine.directive('select', async (el, { expression }, { evaluate, cleanup, Alpine }) => { |
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const html = /*html*/ `<div |
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x-data="_selectImplementation()" |
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class="multiselect--select-wrapper" |
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:class="{ |
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'is-expanded': expanded, |
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'is-overlapping': listboxOverlapsTrigger, |
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...Object.fromEntries(positionClasses.map(c => [c, true])), |
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}" |
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></div>` |
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|
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el.insertAdjacentHTML('beforebegin', html) |
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el.previousElementSibling.prepend(el) |
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|
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el.classList.add('multiselect--select-field') |
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el.setAttribute(':class', '{ touched: $data.touched }') |
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el.tabIndex = -1 |
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el.setAttribute('inert', '') |
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el.setAttribute('aria-hidden', 'true') |
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el.setAttribute('x-on:focus', '$refs.listboxTrigger.focus()') |
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|
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if (expression) { |
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el.setAttribute('x-model', expression) |
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Alpine.nextTick(() => updateSelectedOptions()) |
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evaluate(`$watch('${expression}', () => $data.$select.updateSelectedOptions())`) |
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} |
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|
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const optionsMap = new WeakMap() |
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function readOptions() { |
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const options = [...el.options].filter(option => !option.disabled) |
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return options.map(option => { |
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let id |
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if (optionsMap.has(option)) { |
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id = optionsMap.get(option) |
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} else { |
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id = crypto.randomUUID() |
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optionsMap.set(option, id) |
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} |
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|
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return { |
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id, |
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value: option.value, |
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label: option.textContent, |
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} |
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}) |
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} |
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|
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const state = Alpine.reactive({ |
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id: el.id ?? crypto.randomUUID(), |
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placeholder: el.getAttribute('placeholder') ?? '', |
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required: el.required, |
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multiple: el.multiple, |
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disabled: el.disabled, |
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options: readOptions(), |
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|
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selectedOptions: [], |
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|
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get selectedOption() { |
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if (this.multiple) { |
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return this.selectedOptions |
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} else { |
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return this.selectedOptions[0] |
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} |
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}, |
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get modelValue() { |
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if (this.multiple) { |
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return this.selectedOptions.map(option => option.value) |
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} else { |
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return this.selectedOptions[0]?.value |
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} |
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}, |
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}) |
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|
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function readSelectedOptions() { |
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return [...el.options].flatMap((option, index) => |
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option.selected ? state.options[index] : [], |
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) |
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} |
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state.selectedOptions = readSelectedOptions() |
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|
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const updateMultiple = () => (state.multiple = el.multiple) |
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const updateDisabled = () => (state.disabled = el.disabled) |
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const updateId = () => (state.id = el.id ?? crypto.randomUUID()) |
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const updatePlaceholder = () => (state.placeholder = el.getAttribute('placeholder') ?? '') |
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const updateRequired = () => (state.required = el.required) |
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|
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const updateState = (option, getter) => { |
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const newData = getter() |
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if (JSON.stringify(newData) !== JSON.stringify(state[option])) { |
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state[option] = newData |
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} |
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} |
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|
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const updateOptions = () => updateState('options', readOptions) |
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const updateSelectedOptions = () => updateState('selectedOptions', readSelectedOptions) |
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|
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el.addEventListener('change', updateSelectedOptions) |
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|
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const observer = new MutationObserver(entries => { |
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for (const entry of entries) { |
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if (entry.type === 'attributes') { |
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switch (entry.attributeName) { |
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case 'multiple': |
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updateMultiple() |
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updateSelectedOptions() |
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|
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if (expression) { |
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el.dispatchEvent(new Event('change', { bubbles: true })) |
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} |
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break |
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case 'disabled': |
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updateDisabled() |
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break |
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case 'id': |
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updateId() |
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break |
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case 'placeholder': |
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updatePlaceholder() |
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break |
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case 'required': |
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updateRequired() |
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break |
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} |
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} else if (entry.type === 'childList') { |
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updateOptions() |
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updateSelectedOptions() |
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} |
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} |
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}) |
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|
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observer.observe(el, { |
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childList: true, |
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attributes: true, |
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subtree: true, |
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attributeFilter: ['multiple', 'disabled', 'id', 'placeholder', 'required'], |
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}) |
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|
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// Expose API to $select |
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await Alpine.nextTick() |
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const $select = { |
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el, |
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wrapperElement: el.parentElement, |
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props: { |
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get selectedOption() { |
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return state.selectedOption |
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}, |
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get modelValue() { |
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return state.modelValue |
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}, |
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get options() { |
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return state.options |
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}, |
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get id() { |
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return state.id |
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}, |
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get disabled() { |
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return state.disabled |
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}, |
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get multiple() { |
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return state.multiple |
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}, |
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get placeholder() { |
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return state.placeholder |
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}, |
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get required() { |
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return state.required |
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}, |
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}, |
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setValue(value) { |
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value = Array.isArray(value) ? value : [value] |
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|
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for (const option of el.options) { |
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option.selected = value.includes(option.value) |
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} |
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|
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el.dispatchEvent(new Event('change', { bubbles: true })) |
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}, |
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updateSelectedOptions, |
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refresh() { |
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updateMultiple() |
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updateDisabled() |
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|
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updateOptions() |
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updateId() |
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updatePlaceholder() |
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|
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updateSelectedOptions() |
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}, |
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} |
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evaluate('$data').$select = $select |
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Alpine.evaluate(el.parentElement, '$data').$select = $select |
|
|
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// Can't inject this earlier because we need the $select API to be available |
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el.insertAdjacentHTML( |
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'afterend', |
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/*html*/ ` |
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<button |
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x-ref="listboxTrigger" |
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type="button" |
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class="multiselect--select-trigger" |
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:class="{ inert: expanded }" |
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:disabled="props.disabled" |
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:id="idTrigger" |
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aria-haspopup="true" |
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:aria-expanded="expanded" |
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:aria-controls="idListbox" |
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@click="open()" |
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@keydown.up.prevent="$el.click()" |
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@keydown.down.prevent="$el.click()" |
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> |
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<span class="multiselect--select-trigger-label" x-text="getPlaceholder(props.selectedOption)"></span> |
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</button> |
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<template x-if="expanded"> |
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<ul |
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x-ref="listbox" |
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class="multiselect--select-listbox" |
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:id="idListbox" |
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:style="positioningStyles" |
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tabindex="0" |
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role="listbox" |
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aria-orientation="vertical" |
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:aria-labelledby="idTrigger" |
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:aria-activedescendant="activatedId" |
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@keydown="onListboxKeydown" |
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@mouseout="activatedIndex = undefined" |
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@blur="close()" |
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> |
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<template x-for="({ id, value, label }, index) in props.options"> |
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<li |
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:key="id" |
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:id="id" |
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class="multiselect--select-listbox-item" |
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:class="{ |
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'is-active': activatedIndex === index, |
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'is-selected': valueArray.includes(value) |
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}" |
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role="option" |
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:aria-selected="valueArray.includes(value)" |
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:value="value" |
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tabindex="-1" |
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@mouseenter="activatedIndex = index" |
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@mousedown.prevent="commitSingleValue(value)" |
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x-text="label" |
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></li> |
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</template> |
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</ul> |
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</template> |
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`, |
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) |
|
|
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// Stop observing select on cleanup |
|
cleanup(() => { |
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observer.disconnect() |
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el.removeEventListener('change', updateSelectedOptions) |
|
|
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el.classList.remove('multiselect--select-field') |
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el.removeAttribute('inert') |
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el.removeAttribute('x-model') |
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el.removeAttribute('x-on:focus') |
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el.removeAttribute(':class') |
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el.removeAttribute('tabindex') |
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el.removeAttribute('aria-hidden') |
|
|
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if (document.contains(el)) { |
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const container = el.parentElement |
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container.after(el) |
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container.remove() |
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} |
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}) |
|
}) |
|
} |
