feat: dynamically fetch indices

Jacky Zhao

2022-02-16 fcd5d2807d2bab68c6776e031e85d65fe88a6f7a

 layouts/partials/search.html

@@ -1,7 +1,6 @@
<div id="search-container">
    <div id="search-space">
        <input autoComplete="off" id="search-bar" name="search" type="text" aria-label="Search"
               placeholder="Search for something...">
        <input autocomplete="off" id="search-bar" name="search" type="text" aria-label="Search" placeholder="Search for something...">
        <div id="results-container">
        </div>
    </div>
@@ -68,154 +67,194 @@
    };
</script>
<script>
    const contentIndex = new FlexSearch.Worker({
        tokenize: "reverse",
        charset: "latin:extra",
async function run() {
  const contentIndex = new FlexSearch.Document({
    cache: true,
    charset: "latin:extra",
    optimize: true,
    worker: true,
    document: {
      index: [{
        field: "content",
        tokenize: "strict",
        context: {
          resolution: 5,
          depth: 3,
          bidirectional: true
        },
        suggest: true,
      }, {
        field: "title",
        tokenize: "forward",
      }]
    }
  })

  const { content } = await fetchData()
  for (const [key, value] of Object.entries(content)) {
    contentIndex.add({
      id: key,
      title: value.title,
      content: removeMarkdown(value.content),
    })
  }

    const scrapedContent = {{$.Site.Data.contentIndex}}
    for (const [key, value] of Object.entries(scrapedContent)) {
        contentIndex.add(key, value.content)
  const highlight = (content, term) => {
    const highlightWindow = 20
    const tokenizedTerm = term.split(/\s+/).filter(t => t !== "")
    const splitText = content.split(/\s+/).filter(t => t !== "")
    const includesCheck = (token) => tokenizedTerm.some(term => token.toLowerCase().startsWith(term.toLowerCase()))

    const occurrencesIndices = splitText
      .map(includesCheck)

    // calculate best index
    let bestSum = 0
    let bestIndex = 0
    for (let i = 0; i < Math.max(occurrencesIndices.length - highlightWindow, 0); i++) {
      const window = occurrencesIndices.slice(i, i + highlightWindow)
      const windowSum = window.reduce((total, cur) => total + cur, 0)
      if (windowSum >= bestSum) {
        bestSum = windowSum
        bestIndex = i
      }
    }

    const highlight = (content, term) => {
        const highlightWindow = 15
        const tokenizedTerm = term.split(/\s+/).filter(t => t !== "")
        const splitText = content.split(/\s+/).filter(t => t !== "")
        const includesCheck = (token) => tokenizedTerm.some(term => token.toLowerCase().includes(term.toLowerCase()))

        const occurrencesIndices = splitText
            .map(includesCheck)

        // calculate best index
        let bestSum = 0
        let bestIndex = 0
        for (let i = 0; i < Math.max(occurrencesIndices.length - highlightWindow, 0); i++) {
            const window = occurrencesIndices.slice(i, i + highlightWindow)
            const windowSum = window.reduce((total, cur) => total + cur, 0)
            if (windowSum >= bestSum) {
                bestSum = windowSum
                bestIndex = i
            }
    const startIndex = Math.max(bestIndex - highlightWindow, 0)
    const endIndex = Math.min(startIndex + 2 * highlightWindow, splitText.length)
    const mappedText = splitText
      .slice(startIndex, endIndex)
      .map(token => {
        if (includesCheck(token)) {
          return `<span class="search-highlight">${token}</span>`
        }
        return token
      })
      .join(" ")
      .replaceAll('</span> <span class="search-highlight">', " ")
    return `${startIndex === 0 ? "" : "..."}${mappedText}${endIndex === splitText.length ? "" : "..."}`
  }

        const startIndex = Math.max(bestIndex - highlightWindow, 0)
        const endIndex = Math.min(startIndex + 2 * highlightWindow, splitText.length)
        const mappedText = splitText
            .slice(startIndex, endIndex)
            .map(token => {
                if (includesCheck(token)) {
                    return `<span class="search-highlight">${token}</span>`
                }
                return token
            })
            .join(" ")
            .replaceAll('</span> <span class="search-highlight">', " ")
        return `${startIndex === 0 ? "" : "..."}${mappedText}${endIndex === splitText.length ? "" : "..."}`
    }

    const resultToHTML = ({url, title, content, term}) => {
        const md = content.split("---")[2]
        const text = removeMarkdown(md)
        const resultTitle = highlight(title, term)
        const resultText = highlight(text, term)
        return `<button class="result-card" id="${url}">
  const resultToHTML = ({url, title, content, term}) => {
    const text = removeMarkdown(content)
    const resultTitle = highlight(title, term)
    const resultText = highlight(text, term)
    return `<button class="result-card" id="${url}">
        <h3>${resultTitle}</h3>
        <p>${resultText}</p>
    </button>`
  }

  const redir = (id, term) => {
    window.location.href = "{{.Site.BaseURL}}" + `${id}#:~:text=${encodeURIComponent(term)}`
  }

  const formatForDisplay = id => ({
    id,
    url: id,
    title: content[id].title,
    content: content[id].content
  })

  const source = document.getElementById('search-bar')
  const results = document.getElementById("results-container")
  let term
  source.addEventListener("keyup", (e) => {
    if (e.key === "Enter") {
      const anchor = document.getElementsByClassName("result-card")[0]
      redir(anchor.id, term)
    }

    const redir = (id, term) => {
        window.location.href = {{.Site.BaseURL}} + `${id}#:~:text=${encodeURIComponent(term)}`
    }

    const source = document.getElementById('search-bar')
    const results = document.getElementById("results-container")
    let term
    source.addEventListener("keyup", (e) => {
        if (e.key === "Enter") {
            const anchor = document.getElementsByClassName("result-card")[0]
            redir(anchor.id, term)
        }
    })
    source.addEventListener('input', (e) => {
        term = e.target.value
        contentIndex.search(term, {
            limit: 20,
            depth: 3,
            suggest: true,
        }).then(searchResults => {
            const resultIds = [...new Set(searchResults)]
            const finalResults = resultIds.map(id => ({
                url: id,
                title: scrapedContent[id].title,
                content: scrapedContent[id].content
            }))

            // display
            if (finalResults.length === 0) {
                results.innerHTML = `<div class="result-card">
            <p>No results.</p>
        </div>`
            } else {
                results.innerHTML = finalResults
                    .map(result => resultToHTML({
                        ...result,
                        term,
                    }))
                    .join("\n")
                const anchors = document.getElementsByClassName("result-card");
                [...anchors].forEach(anchor => {
                    anchor.onclick = () => redir(anchor.id, term)
                })
            }
        })
    })


    const searchContainer = document.getElementById("search-container")

    function openSearch() {
        if (searchContainer.style.display === "none" || searchContainer.style.display === "") {
            source.value = ""
            results.innerHTML = ""
            searchContainer.style.display = "block"
            source.focus()
  })
  source.addEventListener('input', (e) => {
    term = e.target.value
    contentIndex.search(term, [
      {
        field: "content",
        limit: 10,
        suggest: true,
      },
      {
        field: "title",
        limit: 5,
      }
    ]).then(searchResults => {
      const getByField = field => {
        const results = searchResults.filter(x => x.field === field)
        if (results.length === 0) {
          return []
        } else {
            searchContainer.style.display = "none"
          return [...results[0].result]
        }
    }
      }
      const allIds = new Set([...getByField('title'), ...getByField('content')])
      const finalResults = [...allIds].map(formatForDisplay)

    function closeSearch() {
        searchContainer.style.display = "none"
    }

    document.addEventListener('keydown', (event) => {
        if (event.key === "/") {
            event.preventDefault()
            openSearch()
        }
        if (event.key === "Escape") {
            event.preventDefault()
            closeSearch()
        }
      // display
      if (finalResults.length === 0) {
        results.innerHTML = `<button class="result-card">
                    <h3>No results.</h3>
                    <p>Try another search term?</p>
                </button>`
      } else {
        results.innerHTML = finalResults
          .map(result => resultToHTML({
            ...result,
            term,
          }))
          .join("\n")
        const anchors = document.getElementsByClassName("result-card");
        [...anchors].forEach(anchor => {
          anchor.onclick = () => redir(anchor.id, term)
        })
      }
    })
  })

    window.addEventListener('DOMContentLoaded', () => {
        const searchButton = document.getElementById("search-icon")
        searchButton.addEventListener('click', (evt) => {
            openSearch()
        })
        searchButton.addEventListener('keydown', (evt) => {
            openSearch()
        })
        searchContainer.addEventListener('click', (evt) => {
            closeSearch()
        })
        document.getElementById("search-space").addEventListener('click', (evt) => {
            evt.stopPropagation()
        })

  const searchContainer = document.getElementById("search-container")

  function openSearch() {
    if (searchContainer.style.display === "none" || searchContainer.style.display === "") {
      source.value = ""
      results.innerHTML = ""
      searchContainer.style.display = "block"
      source.focus()
    } else {
      searchContainer.style.display = "none"
    }
  }

  function closeSearch() {
    searchContainer.style.display = "none"
  }

  document.addEventListener('keydown', (event) => {
    if (event.key === "/") {
      event.preventDefault()
      openSearch()
    }
    if (event.key === "Escape") {
      event.preventDefault()
      closeSearch()
    }
  })

  window.addEventListener('DOMContentLoaded', () => {
    const searchButton = document.getElementById("search-icon")
    searchButton.addEventListener('click', (evt) => {
      openSearch()
    })
    searchButton.addEventListener('keydown', (evt) => {
      openSearch()
    })
    searchContainer.addEventListener('click', (evt) => {
      closeSearch()
    })
    document.getElementById("search-space").addEventListener('click', (evt) => {
      evt.stopPropagation()
    })
  })
}

</script>
run()
</script>