import { ApplicationController } from './application_controller'; export class SelectChampPositionTemplateController extends ApplicationController { static targets = ['select', 'template']; static values = { templateId: String }; // this element is updated via turbostream as the source of truth for all select declare readonly templateIdValue: string; declare readonly selectTargets: HTMLSelectElement[]; selectTargetConnected(selectElement: HTMLSelectElement) { selectElement.addEventListener('focus', this); selectElement.addEventListener('change', this); } selectTargetDisconnected(selectElement: HTMLSelectElement) { selectElement.removeEventListener('focus', this); selectElement.removeEventListener('change', this); } handleEvent(event: Event) { switch (event.type) { case 'focus': this.onFocus(event); break; case 'change': this.onChange(event); break; } } private onFocus(event: Event): void { const focusedSelect = event.target as HTMLSelectElement; const focusedSelectStableId = this.getStableIdForSelect(focusedSelect); const template = this.element.querySelector<HTMLElement>( `#${this.templateIdValue}` ); if (template) { const fragment = template.cloneNode(true) as HTMLSelectElement; const options = Array.from(fragment.querySelectorAll('option')); options.map((option) => { // can't move current element after current element if (option.value == focusedSelectStableId) { option.setAttribute('selected', 'selected'); option.setAttribute('disabled', 'disabled'); } }); options.map((option, index) => { const previousOption = options[index - 1]; // can't move current element after previous element if (previousOption && option.value == focusedSelectStableId) { previousOption.setAttribute('selected', 'selected'); previousOption.setAttribute('disabled', 'disabled'); } }); focusedSelect.innerHTML = options .map((option) => option.outerHTML) .join(''); } } private onChange(event: Event): void { const changedSelectTarget = event.target as HTMLSelectElement; const stableIdDidChange = changedSelectTarget.value != this.getStableIdForSelect(changedSelectTarget); if (stableIdDidChange) { changedSelectTarget.form?.requestSubmit(); } event.stopImmediatePropagation(); } private getStableIdForSelect(select: HTMLSelectElement): string | null { return select.getAttribute('data-selected'); } }