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govuk-frontend

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GOV.UK Frontend contains the code you need to start building a user interface for government platforms and services.

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{"version":3,"file":"tabs.mjs","sources":["../../../../src/govuk/components/tabs/tabs.mjs"],"sourcesContent":["import { getBreakpoint } from '../../common/index.mjs'\nimport { Component } from '../../component.mjs'\nimport { ElementError } from '../../errors/index.mjs'\n\n/**\n * Tabs component\n *\n * @preserve\n */\nexport class Tabs extends Component {\n /** @private */\n $tabs\n\n /** @private */\n $tabList\n\n /** @private */\n $tabListItems\n\n /** @private */\n jsHiddenClass = 'govuk-tabs__panel--hidden'\n\n /** @private */\n changingHash = false\n\n /** @private */\n boundTabClick\n\n /** @private */\n boundTabKeydown\n\n /** @private */\n boundOnHashChange\n\n /**\n * @private\n * @type {MediaQueryList | null}\n */\n mql = null\n\n /**\n * @param {Element | null} $root - HTML element to use for tabs\n */\n constructor($root) {\n super($root)\n\n const $tabs = this.$root.querySelectorAll('a.govuk-tabs__tab')\n if (!$tabs.length) {\n throw new ElementError({\n component: Tabs,\n identifier: 'Links (`<a class=\"govuk-tabs__tab\">`)'\n })\n }\n\n this.$tabs = $tabs\n\n // Save bound functions so we can remove event listeners during teardown\n this.boundTabClick = this.onTabClick.bind(this)\n this.boundTabKeydown = this.onTabKeydown.bind(this)\n this.boundOnHashChange = this.onHashChange.bind(this)\n\n const $tabList = this.$root.querySelector('.govuk-tabs__list')\n const $tabListItems = this.$root.querySelectorAll(\n 'li.govuk-tabs__list-item'\n )\n\n if (!$tabList) {\n throw new ElementError({\n component: Tabs,\n identifier: 'List (`<ul class=\"govuk-tabs__list\">`)'\n })\n }\n\n if (!$tabListItems.length) {\n throw new ElementError({\n component: Tabs,\n identifier: 'List items (`<li class=\"govuk-tabs__list-item\">`)'\n })\n }\n\n this.$tabList = $tabList\n this.$tabListItems = $tabListItems\n\n this.setupResponsiveChecks()\n }\n\n /**\n * Setup viewport resize check\n *\n * @private\n */\n setupResponsiveChecks() {\n const breakpoint = getBreakpoint('tablet')\n\n if (!breakpoint.value) {\n throw new ElementError({\n component: Tabs,\n identifier: `CSS custom property (\\`${breakpoint.property}\\`) on pseudo-class \\`:root\\``\n })\n }\n\n // Media query list for GOV.UK Frontend tablet breakpoint\n this.mql = window.matchMedia(`(min-width: ${breakpoint.value})`)\n\n // MediaQueryList.addEventListener isn't supported by Safari < 14 so we need\n // to be able to fall back to the deprecated MediaQueryList.addListener\n if ('addEventListener' in this.mql) {\n this.mql.addEventListener('change', () => this.checkMode())\n } else {\n // @ts-expect-error Property 'addListener' does not exist\n // eslint-disable-next-line @typescript-eslint/no-unsafe-call\n this.mql.addListener(() => this.checkMode())\n }\n\n this.checkMode()\n }\n\n /**\n * Setup or teardown handler for viewport resize check\n *\n * @private\n */\n checkMode() {\n if (this.mql?.matches) {\n this.setup()\n } else {\n this.teardown()\n }\n }\n\n /**\n * Setup tab component\n *\n * @private\n */\n setup() {\n this.$tabList.setAttribute('role', 'tablist')\n\n this.$tabListItems.forEach(($item) => {\n $item.setAttribute('role', 'presentation')\n })\n\n this.$tabs.forEach(($tab) => {\n // Set HTML attributes\n this.setAttributes($tab)\n\n // Handle events\n $tab.addEventListener('click', this.boundTabClick, true)\n $tab.addEventListener('keydown', this.boundTabKeydown, true)\n\n // Remove old active panels\n this.hideTab($tab)\n })\n\n // Show either the active tab according to the URL's hash or the first tab\n const $activeTab = this.getTab(window.location.hash) ?? this.$tabs[0]\n\n this.showTab($activeTab)\n\n // Handle hashchange events\n window.addEventListener('hashchange', this.boundOnHashChange, true)\n }\n\n /**\n * Teardown tab component\n *\n * @private\n */\n teardown() {\n this.$tabList.removeAttribute('role')\n\n this.$tabListItems.forEach(($item) => {\n $item.removeAttribute('role')\n })\n\n this.$tabs.forEach(($tab) => {\n // Remove events\n $tab.removeEventListener('click', this.boundTabClick, true)\n $tab.removeEventListener('keydown', this.boundTabKeydown, true)\n\n // Unset HTML attributes\n this.unsetAttributes($tab)\n })\n\n // Remove hashchange event handler\n window.removeEventListener('hashchange', this.boundOnHashChange, true)\n }\n\n /**\n * Handle hashchange event\n *\n * @private\n * @returns {void | undefined} Returns void, or undefined when prevented\n */\n onHashChange() {\n const hash = window.location.hash\n const $tabWithHash = this.getTab(hash)\n if (!$tabWithHash) {\n return\n }\n\n // Prevent changing the hash\n if (this.changingHash) {\n this.changingHash = false\n return\n }\n\n // Show either the active tab according to the URL's hash or the first tab\n const $previousTab = this.getCurrentTab()\n if (!$previousTab) {\n return\n }\n\n this.hideTab($previousTab)\n this.showTab($tabWithHash)\n $tabWithHash.focus()\n }\n\n /**\n * Hide panel for tab link\n *\n * @private\n * @param {HTMLAnchorElement} $tab - Tab link\n */\n hideTab($tab) {\n this.unhighlightTab($tab)\n this.hidePanel($tab)\n }\n\n /**\n * Show panel for tab link\n *\n * @private\n * @param {HTMLAnchorElement} $tab - Tab link\n */\n showTab($tab) {\n this.highlightTab($tab)\n this.showPanel($tab)\n }\n\n /**\n * Get tab link by hash\n *\n * @private\n * @param {string} hash - Hash fragment including #\n * @returns {HTMLAnchorElement | null} Tab link\n */\n getTab(hash) {\n return this.$root.querySelector(`a.govuk-tabs__tab[href=\"${hash}\"]`)\n }\n\n /**\n * Set tab link and panel attributes\n *\n * @private\n * @param {HTMLAnchorElement} $tab - Tab link\n */\n setAttributes($tab) {\n const panelId = $tab.hash.replace('#', '')\n if (!panelId) {\n return\n }\n\n // Set tab attributes\n $tab.setAttribute('id', `tab_${panelId}`)\n $tab.setAttribute('role', 'tab')\n $tab.setAttribute('aria-controls', panelId)\n $tab.setAttribute('aria-selected', 'false')\n $tab.setAttribute('tabindex', '-1')\n\n // Set panel attributes\n const $panel = this.getPanel($tab)\n if (!$panel) {\n return\n }\n\n $panel.setAttribute('role', 'tabpanel')\n $panel.setAttribute('aria-labelledby', $tab.id)\n $panel.classList.add(this.jsHiddenClass)\n }\n\n /**\n * Unset tab link and panel attributes\n *\n * @private\n * @param {HTMLAnchorElement} $tab - Tab link\n */\n unsetAttributes($tab) {\n // unset tab attributes\n $tab.removeAttribute('id')\n $tab.removeAttribute('role')\n $tab.removeAttribute('aria-controls')\n $tab.removeAttribute('aria-selected')\n $tab.removeAttribute('tabindex')\n\n // unset panel attributes\n const $panel = this.getPanel($tab)\n if (!$panel) {\n return\n }\n\n $panel.removeAttribute('role')\n $panel.removeAttribute('aria-labelledby')\n $panel.classList.remove(this.jsHiddenClass)\n }\n\n /**\n * Handle tab link clicks\n *\n * @private\n * @param {MouseEvent} event - Mouse click event\n * @returns {void} Returns void\n */\n onTabClick(event) {\n const $currentTab = 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$previousTabListItem =\n $currentTab.parentElement.previousElementSibling\n if (!$previousTabListItem) {\n return\n }\n\n const $previousTab = $previousTabListItem.querySelector('a.govuk-tabs__tab')\n if (!$previousTab) {\n return\n }\n\n this.hideTab($currentTab)\n this.showTab($previousTab)\n $previousTab.focus()\n this.createHistoryEntry($previousTab)\n }\n\n /**\n * Get tab panel for tab link\n *\n * @private\n * @param {HTMLAnchorElement} $tab - Tab link\n * @returns {Element | null} Tab panel\n */\n getPanel($tab) {\n const panelId = $tab.hash.replace('#', '')\n if (!panelId) {\n return null\n }\n\n return this.$root.querySelector(`#${panelId}`)\n }\n\n /**\n * Show tab panel for tab link\n *\n * @private\n * @param {HTMLAnchorElement} $tab - Tab link\n */\n showPanel($tab) {\n const $panel = this.getPanel($tab)\n if (!$panel) {\n return\n }\n\n $panel.classList.remove(this.jsHiddenClass)\n }\n\n /**\n * Hide tab panel for tab link\n *\n * @private\n * @param {HTMLAnchorElement} 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