BookStack/resources/js/components/tabs.js
Dan Brown f5ef52ca59
Image manager: cleaned up style changes, dark mode support
- Updated tab handling to be smarter on initial tab selection, to first
  target non-hidden tab panels where they may be handled server-side.
- Extracted contained search box handling styles to _forms.scss, after
  merging with image-manager-specific styles since this is only usage of
  contained variant.
- Aligned focus handling on image manager UI elements.
2023-05-29 15:50:36 +01:00

89 lines
2.5 KiB
JavaScript

import {Component} from './component';
/**
* Tabs
* Uses accessible attributes to drive its functionality.
* On tab wrapping element:
* - role=tablist
* On tabs (Should be a button):
* - id
* - role=tab
* - aria-selected=true/false
* - aria-controls=<id-of-panel-section>
* On panels:
* - id
* - tabindex=0
* - role=tabpanel
* - aria-labelledby=<id-of-tab-for-panel>
* - hidden (If not shown by default).
*/
export class Tabs extends Component {
setup() {
this.container = this.$el;
this.tabList = this.container.querySelector('[role="tablist"]');
this.tabs = Array.from(this.tabList.querySelectorAll('[role="tab"]'));
this.panels = Array.from(this.container.querySelectorAll(':scope > [role="tabpanel"], :scope > * > [role="tabpanel"]'));
this.activeUnder = this.$opts.activeUnder ? Number(this.$opts.activeUnder) : 10000;
this.active = null;
this.container.addEventListener('click', event => {
const tab = event.target.closest('[role="tab"]');
if (tab && this.tabs.includes(tab)) {
this.show(tab.getAttribute('aria-controls'));
}
});
window.addEventListener('resize', this.updateActiveState.bind(this), {
passive: true,
});
this.updateActiveState();
}
show(sectionId) {
for (const panel of this.panels) {
panel.toggleAttribute('hidden', panel.id !== sectionId);
}
for (const tab of this.tabs) {
const tabSection = tab.getAttribute('aria-controls');
const selected = tabSection === sectionId;
tab.setAttribute('aria-selected', selected ? 'true' : 'false');
}
this.$emit('change', {showing: sectionId});
}
updateActiveState() {
const active = window.innerWidth < this.activeUnder;
if (active === this.active) {
return;
}
if (active) {
this.activate();
} else {
this.deactivate();
}
this.active = active;
}
activate() {
const panelToShow = this.panels.find(p => !p.hasAttribute('hidden')) || this.panels[0];
this.show(panelToShow.id);
this.tabList.toggleAttribute('hidden', false);
}
deactivate() {
for (const panel of this.panels) {
panel.removeAttribute('hidden');
}
for (const tab of this.tabs) {
tab.setAttribute('aria-selected', 'false');
}
this.tabList.toggleAttribute('hidden', true);
}
}