{"version":3,"file":"skip-link.mjs","sources":["../../../../src/govuk/components/skip-link/skip-link.mjs"],"sourcesContent":["import { getFragmentFromUrl, setFocus } from '../../common/index.mjs'\nimport { ElementError } from '../../errors/index.mjs'\nimport { GOVUKFrontendComponent } from '../../govuk-frontend-component.mjs'\n\n/**\n * Skip link component\n *\n * @preserve\n * @augments GOVUKFrontendComponent<HTMLAnchorElement>\n */\nexport class SkipLink extends GOVUKFrontendComponent {\n  static elementType = HTMLAnchorElement\n\n  /**\n   * @param {Element | null} $root - HTML element to use for skip link\n   * @throws {ElementError} when $root is not set or the wrong type\n   * @throws {ElementError} when $root.hash does not contain a hash\n   * @throws {ElementError} when the linked element is missing or the wrong type\n   */\n  constructor($root) {\n    super($root)\n\n    const hash = this.$root.hash\n    const href = this.$root.getAttribute('href') ?? ''\n\n    /** @type {URL | undefined} */\n    let url\n\n    /**\n     * Check for valid link URL\n     *\n     * {@link https://caniuse.com/url}\n     * {@link https://url.spec.whatwg.org}\n     *\n     */\n    try {\n      url = new window.URL(this.$root.href)\n    } catch (error) {\n      throw new ElementError(\n        `Skip link: Target link (\\`href=\"${href}\"\\`) is invalid`\n      )\n    }\n\n    // Return early for external URLs or links to other pages\n    if (\n      url.origin !== window.location.origin ||\n      url.pathname !== window.location.pathname\n    ) {\n      return\n    }\n\n    const linkedElementId = getFragmentFromUrl(hash)\n\n    // Check link path matching current page\n    if (!linkedElementId) {\n      throw new ElementError(\n        `Skip link: Target link (\\`href=\"${href}\"\\`) has no hash fragment`\n      )\n    }\n\n    const $linkedElement = document.getElementById(linkedElementId)\n\n    // Check for link target element\n    if (!$linkedElement) {\n      throw new ElementError({\n        component: SkipLink,\n        element: $linkedElement,\n        identifier: `Target content (\\`id=\"${linkedElementId}\"\\`)`\n      })\n    }\n\n    /**\n     * Focus the linked element on click\n     *\n     * Adds a helper CSS class to hide native focus styles,\n     * but removes it on blur to restore native focus styles\n     */\n    this.$root.addEventListener('click', () =>\n      setFocus($linkedElement, {\n        onBeforeFocus() {\n          $linkedElement.classList.add('govuk-skip-link-focused-element')\n        },\n        onBlur() {\n          $linkedElement.classList.remove('govuk-skip-link-focused-element')\n        }\n      })\n    )\n  }\n\n  /**\n   * Name for the component used when initialising using data-module attributes.\n   */\n  static moduleName = 'govuk-skip-link'\n}\n"],"names":["SkipLink","GOVUKFrontendComponent","constructor","$root","_this$$root$getAttrib","hash","href","getAttribute","url","window","URL","error","ElementError","origin","location","pathname","linkedElementId","getFragmentFromUrl","$linkedElement","document","getElementById","component","element","identifier","addEventListener","setFocus","onBeforeFocus","classList","add","onBlur","remove","elementType","HTMLAnchorElement","moduleName"],"mappings":";;;;AAIA;AACA;AACA;AACA;AACA;AACA;AACO,MAAMA,QAAQ,SAASC,sBAAsB,CAAC;AAGnD;AACF;AACA;AACA;AACA;AACA;EACEC,WAAWA,CAACC,KAAK,EAAE;AAAA,IAAA,IAAAC,qBAAA,CAAA;IACjB,KAAK,CAACD,KAAK,CAAC,CAAA;AAEZ,IAAA,MAAME,IAAI,GAAG,IAAI,CAACF,KAAK,CAACE,IAAI,CAAA;AAC5B,IAAA,MAAMC,IAAI,GAAA,CAAAF,qBAAA,GAAG,IAAI,CAACD,KAAK,CAACI,YAAY,CAAC,MAAM,CAAC,KAAAH,IAAAA,GAAAA,qBAAA,GAAI,EAAE,CAAA;AAGlD,IAAA,IAAII,GAAG,CAAA;IASP,IAAI;MACFA,GAAG,GAAG,IAAIC,MAAM,CAACC,GAAG,CAAC,IAAI,CAACP,KAAK,CAACG,IAAI,CAAC,CAAA;KACtC,CAAC,OAAOK,KAAK,EAAE;AACd,MAAA,MAAM,IAAIC,YAAY,CACpB,CAAmCN,gCAAAA,EAAAA,IAAI,iBACzC,CAAC,CAAA;AACH,KAAA;AAGA,IAAA,IACEE,GAAG,CAACK,MAAM,KAAKJ,MAAM,CAACK,QAAQ,CAACD,MAAM,IACrCL,GAAG,CAACO,QAAQ,KAAKN,MAAM,CAACK,QAAQ,CAACC,QAAQ,EACzC;AACA,MAAA,OAAA;AACF,KAAA;AAEA,IAAA,MAAMC,eAAe,GAAGC,kBAAkB,CAACZ,IAAI,CAAC,CAAA;IAGhD,IAAI,CAACW,eAAe,EAAE;AACpB,MAAA,MAAM,IAAIJ,YAAY,CACpB,CAAmCN,gCAAAA,EAAAA,IAAI,2BACzC,CAAC,CAAA;AACH,KAAA;AAEA,IAAA,MAAMY,cAAc,GAAGC,QAAQ,CAACC,cAAc,CAACJ,eAAe,CAAC,CAAA;IAG/D,IAAI,CAACE,cAAc,EAAE;MACnB,MAAM,IAAIN,YAAY,CAAC;AACrBS,QAAAA,SAAS,EAAErB,QAAQ;AACnBsB,QAAAA,OAAO,EAAEJ,cAAc;QACvBK,UAAU,EAAE,yBAAyBP,eAAe,CAAA,IAAA,CAAA;AACtD,OAAC,CAAC,CAAA;AACJ,KAAA;IAQA,IAAI,CAACb,KAAK,CAACqB,gBAAgB,CAAC,OAAO,EAAE,MACnCC,QAAQ,CAACP,cAAc,EAAE;AACvBQ,MAAAA,aAAaA,GAAG;AACdR,QAAAA,cAAc,CAACS,SAAS,CAACC,GAAG,CAAC,iCAAiC,CAAC,CAAA;OAChE;AACDC,MAAAA,MAAMA,GAAG;AACPX,QAAAA,cAAc,CAACS,SAAS,CAACG,MAAM,CAAC,iCAAiC,CAAC,CAAA;AACpE,OAAA;AACF,KAAC,CACH,CAAC,CAAA;AACH,GAAA;AAMF,CAAA;AAnFa9B,QAAQ,CACZ+B,WAAW,GAAGC,iBAAiB,CAAA;AAD3BhC,QAAQ,CAkFZiC,UAAU,GAAG,iBAAiB;;;;"}