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strict';\n\nconst techSpecs = (function() {\n  const TECH_SPECS_PATH = '/tech-specs';\n  const DOCUMENT_SECTIONS_PATH = '/tech-specs/document-sections';\n  const INCREMENT_DOWNLOAD_COUNT_PATH =\n    '/tech-specs/increment-document-download-count';\n\n  // The outer container element for all the tech-specs content.\n  let techSpecsMainElement;\n\n  function updateBrowserHistory(url) {\n    if (typeof history.pushState != 'undefined') {\n      const obj = { title: '3form', url: url.href };\n      history.pushState(obj, obj.title, obj.url);\n    }\n  }\n\n  // Fetch rendered documents from the server and update browser\n  // history with new url that has the correct query params.\n  function reloadDocuments(fetchUrl, browserHistoryUrl = null) {\n    const container = document.querySelector('#tech-specs-documents-container');\n    container.innerHTML = '<img src=\"static/images/3form-preloader.gif\">';\n\n    const init = { method: 'GET', headers: { Accept: 'text/html' } };\n    fetch(fetchUrl.href, init)\n      .then(response => {\n        if (response.ok) {\n          return response.text();\n        } else {\n          return Promise.reject(response);\n        }\n      })\n      .then(text => {\n        container.innerHTML = text;\n        if (browserHistoryUrl) {\n          updateBrowserHistory(browserHistoryUrl);\n        }\n        // Since we've reloaded the documents section,\n        // we need to re-add event handlers.\n        initDocumentsSection(container);\n        scrollToResults();\n      })\n      .catch(err => {\n        container.innerHTML = '<h3>Error fetching documents</h3>';\n        console.warn('Error while fetching document sections: ', err);\n      });\n  }\n\n  function elementIsFeaturedCategory(element) {\n    return element.classList.contains('tech-specs-featured-category');\n  }\n\n  function elementIsSubcategory(element) {\n    return element.classList.contains('tech-specs-subcategory');\n  }\n\n  function updateClass(element, className, add) {\n    if (add) {\n      element.classList.add(className);\n    } else {\n      element.classList.remove(className);\n    }\n  }\n\n  function addParamToHref(href, key, value) {\n    const url = new URL(href);\n    url.searchParams.set(key, value);\n    return url.href;\n  }\n\n  function removeParamFromHref(href, key) {\n    const url = new URL(href);\n    url.searchParams.delete(key);\n    return url.href;\n  }\n\n  function updateCategoryHref(categoryElement, categoryId, categorySelected) {\n    const linkElement = categoryElement.querySelector(\n      '.tech-specs-category-link'\n    );\n    if (categorySelected) {\n      linkElement.href = removeParamFromHref(linkElement.href, 'category');\n    } else {\n      linkElement.href = addParamToHref(\n        linkElement.href,\n        'category',\n        categoryId\n      );\n    }\n  }\n\n  function updateSubcategoryHref(\n    subcategoryElement,\n    parentCategoryId,\n    subcategoryId,\n    subcategorySelected\n  ) {\n    const linkElement = subcategoryElement.querySelector(\n      '.tech-specs-category-link'\n    );\n    if (subcategorySelected) {\n      linkElement.href = addParamToHref(\n        linkElement.href,\n        'category',\n        parentCategoryId\n      );\n    } else {\n      linkElement.href = addParamToHref(\n        linkElement.href,\n        'category',\n        subcategoryId\n      );\n    }\n  }\n\n  function getSubcategoryParentId(subcategoriesContainer) {\n    return subcategoriesContainer.dataset.parentCategoryId;\n  }\n\n  // Add `search` to query params of all category link hrefs.\n  function updateCategoryLinksWithSearchTerm(searchTerm) {\n    const categories = techSpecsMainElement.querySelectorAll(\n      '.tech-specs-category'\n    );\n    categories.forEach(category => {\n      const categoryLink = category.querySelector('.tech-specs-category-link');\n      if (searchTerm && searchTerm.length > 0) {\n        categoryLink.href = addParamToHref(\n          categoryLink.href,\n          'search',\n          searchTerm\n        );\n      } else {\n        categoryLink.href = removeParamFromHref(categoryLink.href, 'search');\n      }\n    });\n  }\n\n  // Handle all of the required changes to the category elements based on an new category selection.\n  function updateCategoryElements(selectedCategoryId) {\n    let selectedCategoryElement = null;\n    let selectedCategoryIsFeatured = false;\n    let selectedCategoryIsSubcategory = false;\n    let selectedMainCategoryId = null;\n\n    if (selectedCategoryId) {\n      selectedCategoryElement = techSpecsMainElement.querySelector(\n        `[data-category-id=\"${selectedCategoryId}\"]`\n      );\n      selectedCategoryIsFeatured = elementIsFeaturedCategory(\n        selectedCategoryElement\n      );\n      selectedCategoryIsSubcategory = elementIsSubcategory(\n        selectedCategoryElement\n      );\n\n      if (!selectedCategoryIsFeatured) {\n        if (selectedCategoryIsSubcategory) {\n          selectedMainCategoryId = getSubcategoryParentId(\n            selectedCategoryElement.closest('.tech-specs-subcategories')\n          );\n        } else {\n          selectedMainCategoryId = selectedCategoryId;\n        }\n      }\n    }\n\n    // Update the class and associated link href of every category\n    // that's not a subcategory.\n    const categoryElements = techSpecsMainElement.querySelectorAll(\n      '.tech-specs-category'\n    );\n    categoryElements.forEach(categoryElement => {\n      const categoryId = categoryElement.dataset.categoryId;\n      const categorySelected = selectedCategoryId === categoryId;\n      if (elementIsFeaturedCategory(categoryElement)) {\n        updateClass(\n          categoryElement,\n          'tech-specs-category-selected',\n          categorySelected\n        );\n        updateCategoryHref(categoryElement, categoryId, categorySelected);\n      } else if (!elementIsSubcategory(categoryElement)) {\n        const categoryOrSubcategorySelected =\n          selectedMainCategoryId === categoryId;\n        updateClass(\n          categoryElement,\n          'tech-specs-category-selected',\n          categoryOrSubcategorySelected\n        );\n        updateClass(\n          categoryElement,\n          'tech-specs-category-bold',\n          selectedMainCategoryId === null\n        );\n        updateCategoryHref(categoryElement, categoryId, categorySelected);\n      }\n    });\n\n    // Update the class and associated link href of every subcategory,\n    // and set the visibility of each subcategory container based on\n    // whether or not the parent category is selected.\n    const subcategoryContainers = techSpecsMainElement.querySelectorAll(\n      '.tech-specs-subcategories'\n    );\n    subcategoryContainers.forEach(container => {\n      const parentCategoryId = getSubcategoryParentId(container);\n      let hideContainer = selectedCategoryId !== parentCategoryId;\n\n      const subcategoryElements = container.querySelectorAll(\n        '.tech-specs-subcategory'\n      );\n      subcategoryElements.forEach(subcategoryElement => {\n        const subcategoryId = subcategoryElement.dataset.categoryId;\n        const subcategorySelected = selectedCategoryId === subcategoryId;\n        if (subcategorySelected) {\n          hideContainer = false;\n        }\n        updateClass(\n          subcategoryElement,\n          'tech-specs-category-selected',\n          subcategorySelected\n        );\n        updateClass(\n          subcategoryElement,\n          'tech-specs-category-bold',\n          !selectedCategoryIsSubcategory\n        );\n        updateSubcategoryHref(\n          subcategoryElement,\n          parentCategoryId,\n          subcategoryId,\n          subcategorySelected\n        );\n      });\n\n      updateClass(container, 'tech-specs-hidden', hideContainer);\n    });\n  }\n\n  // When the selected category changes, we need to update all of the\n  // category elements and the hidden category input field for the search form.\n  function updatePageForSelectedCategory(selectedCategoryId) {\n    updateCategoryElements(selectedCategoryId);\n    updateSearchFormHiddenCategoryInput(selectedCategoryId);\n  }\n\n  // Update hidden category input in search form with new selected category.\n  function updateSearchFormHiddenCategoryInput(selectedCategoryId) {\n    const searchForm = techSpecsMainElement.querySelector(\n      '#tech-specs-search-form'\n    );\n    const searchCategoryInput = searchForm.querySelector(\"[name='category']\");\n    if (selectedCategoryId != null) {\n      searchCategoryInput.disabled = false;\n      searchCategoryInput.value = selectedCategoryId;\n    } else {\n      searchCategoryInput.disabled = true;\n      searchCategoryInput.removeAttribute('value');\n    }\n  }\n\n  // Fetch new documents and update UI to reflect new category being selected.\n  function onCategoryLinkClicked(linkElement) {\n    const linkUrl = new URL(linkElement.href);\n    const selectedCategoryId = linkUrl.searchParams.get('category');\n\n    updatePageForSelectedCategory(selectedCategoryId);\n\n    // Reload documents and update browser history.\n    const fetchUrl = new URL(linkUrl);\n    fetchUrl.pathname = DOCUMENT_SECTIONS_PATH;\n    reloadDocuments(fetchUrl, linkUrl);\n  }\n\n  // Fetch new documents and update UI based on new search term.\n  function onSearchFormSubmitted(searchForm) {\n    const searchTerm = searchForm.querySelector(\"[name='search']\").value;\n    updateCategoryLinksWithSearchTerm(searchTerm);\n\n    // Build URL from form data, reload documents, and update browser history.\n    const formData = new FormData(searchForm);\n    const searchParams = new URLSearchParams(formData);\n    if (searchTerm.length === 0) {\n      searchParams.delete('search');\n    }\n    const formUrl = new URL(searchForm.action);\n    for (const entry of searchParams.entries()) {\n      formUrl.searchParams.set(entry[0], entry[1]);\n    }\n    const fetchUrl = new URL(formUrl);\n    fetchUrl.pathname = DOCUMENT_SECTIONS_PATH;\n    reloadDocuments(fetchUrl, formUrl);\n  }\n\n  // Clears out the current search and selected category and reloads documents.\n  function clearSearchTermAndSelectedCategory() {\n    updatePageForSelectedCategory(null);\n    updateCategoryLinksWithSearchTerm(null);\n\n    // Reload documents and update browser history.\n    const historyUrl = new URL(TECH_SPECS_PATH, document.baseURI);\n    const fetchUrl = new URL(historyUrl);\n    fetchUrl.pathname = DOCUMENT_SECTIONS_PATH;\n    reloadDocuments(fetchUrl, historyUrl);\n  }\n\n  // Unhide all hidden documents in this document section,\n  // and hide \"See all\" button.\n  function onDocumentsSeeAll(seeAllElement) {\n    const hiddenDocs = seeAllElement.parentElement.getElementsByClassName(\n      'tech-specs-hidden'\n    );\n    while (hiddenDocs.length > 0) {\n      hiddenDocs[0].classList.remove('tech-specs-hidden');\n    }\n    seeAllElement.style.display = 'none';\n  }\n\n  // Update download count for clicked document.\n  function onDocumentLinkClicked(documentLink) {\n    const documentId = documentLink.dataset.documentId;\n\n    const init = { method: 'GET', headers: { Accept: 'application/json' } };\n    fetch(INCREMENT_DOWNLOAD_COUNT_PATH + '?document=' + documentId, init)\n      .then(response => {\n        if (response.ok) {\n          return response.json();\n        } else {\n          return Promise.reject(response);\n        }\n      })\n      .then(result => {\n        if (!result.success) {\n          console.warn(\n            'Server unable to update document download count for document id: ',\n            documentId\n          );\n        }\n      })\n      .catch(err => {\n        console.warn('Error while updating document download count: ', err);\n      });\n  }\n\n  function scrollToResults() {\n    if (document.location.href.includes('?category=')) {\n      const elmnt = document.getElementById('tech-specs-documents-container');\n      elmnt.scrollIntoView({ behavior: 'smooth' });\n    }\n  }\n\n  // Updated page in response to back/forward through browser history.\n  function onPopState(href) {\n    const url = new URL(href);\n    const selectedCategoryId = url.searchParams.get('category');\n    const searchTerm = url.searchParams.get('search');\n    updatePageForSelectedCategory(selectedCategoryId);\n    updateCategoryLinksWithSearchTerm(searchTerm);\n    const fetchUrl = new URL(url);\n    fetchUrl.pathname = DOCUMENT_SECTIONS_PATH;\n    reloadDocuments(fetchUrl);\n  }\n\n  // Intercept category link clicks so we can update without browser page reloads.\n  function initCategoryLinks() {\n    const categoryLinks = techSpecsMainElement.querySelectorAll(\n      '.tech-specs-category-link'\n    );\n    if (categoryLinks) {\n      categoryLinks.forEach(\n        linkElement =>\n          (linkElement.onclick = event => {\n            event.preventDefault();\n            onCategoryLinkClicked(linkElement);\n          })\n      );\n    }\n  }\n\n  // Only show the \"clear search\" button when there is something in the search input.\n  function updateSearchClearButtonVisibility(searchInput, clearButton) {\n    if (searchInput.value.length === 0) {\n      clearButton.classList.add('tech-specs-hidden');\n    } else {\n      clearButton.classList.remove('tech-specs-hidden');\n    }\n  }\n\n  // Intercept search form submits so we can update without browser page reloads.\n  // Also handle the \"clear search\" button.\n  function initSearchForm() {\n    const searchForm = techSpecsMainElement.querySelector(\n      '#tech-specs-search-form'\n    );\n    searchForm.onsubmit = event => {\n      event.preventDefault();\n      onSearchFormSubmitted(searchForm);\n    };\n\n    const searchInput = searchForm.querySelector('.tech-specs-search-input');\n    const clearButton = searchForm.querySelector('.tech-specs-search-clear');\n    clearButton.onclick = event => {\n      event.preventDefault();\n      // Clear search input and hide clear button.\n      searchInput.value = '';\n      searchInput.focus();\n      updateSearchClearButtonVisibility(searchInput, clearButton);\n    };\n\n    searchInput.oninput = () => {\n      updateSearchClearButtonVisibility(searchInput, clearButton);\n    };\n\n    updateSearchClearButtonVisibility(searchInput, clearButton);\n  }\n\n  // Add event handlers to \"Clear All\" button to clear search term\n  // and selected category from results.\n  function initClearAllButtons() {\n    const searchInput = techSpecsMainElement.querySelector(\n      '.tech-specs-search-input'\n    );\n    const searchClearButton = techSpecsMainElement.querySelector(\n      '.tech-specs-search-clear'\n    );\n    const clearAllButtons = techSpecsMainElement.querySelectorAll(\n      '.tech-specs-clear-all-button'\n    );\n    if (clearAllButtons) {\n      clearAllButtons.forEach(\n        clearAllButton =>\n          (clearAllButton.onclick = event => {\n            event.preventDefault();\n            clearSearchTermAndSelectedCategory();\n            searchInput.value = '';\n            updateSearchClearButtonVisibility(searchInput, searchClearButton);\n          })\n      );\n    }\n  }\n\n  // Add event handlers to \"see all\" buttons to unhide documents.\n  function initSeeAllButtons() {\n    const seeAllButtons = techSpecsMainElement.querySelectorAll(\n      '.tech-specs-see-all'\n    );\n    if (seeAllButtons) {\n      seeAllButtons.forEach(\n        seeAllButton =>\n          (seeAllButton.onclick = () => {\n            onDocumentsSeeAll(seeAllButton);\n          })\n      );\n    }\n  }\n\n  // When a document is downloaded we need to update its download count.\n  function initDocumentLinks() {\n    const documentLinks = techSpecsMainElement.querySelectorAll(\n      '.tech-specs-document-link'\n    );\n    if (documentLinks) {\n      documentLinks.forEach(\n        documentLink =>\n          (documentLink.onclick = () => {\n            onDocumentLinkClicked(documentLink);\n          })\n      );\n    }\n  }\n\n  // Add event listeners to elements in the documents section.\n  function initDocumentsSection() {\n    initClearAllButtons();\n    initSeeAllButtons();\n    initDocumentLinks();\n  }\n\n  // Since we're using history.pushState to update the url history,\n  // we need to handle popstate events to get the browser back/forward\n  // navigation to work properly.\n  function addPopStateListener() {\n    addEventListener('popstate', event => {\n      event.preventDefault();\n      onPopState(document.location);\n    });\n  }\n\n  // Initialize tech specs page, adding all required event handlers.\n  function init() {\n    initCategoryLinks();\n    initSearchForm();\n    initDocumentsSection();\n    addPopStateListener();\n  }\n\n  window.addEventListener('DOMContentLoaded', () => {\n    // If we're on the tech specs page, initialize it.\n    techSpecsMainElement = document.querySelector('#tech-specs-main');\n    if (techSpecsMainElement) {\n      init();\n    }\n  });\n})();\n\nexport default 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