docfx/_exported_templates/default/styles/search-worker.js

(function () {
  importScripts('lunr.min.js');

  var lunrIndex = lunr(function () {
    this.pipeline.remove(lunr.stopWordFilter);
    this.ref('href');
    this.field('title', { boost: 50 });
    this.field('keywords', { boost: 20 });
  });
  lunr.tokenizer.seperator = /[\s\-\.]+/;

  var stopWordsRequest = new XMLHttpRequest();
  stopWordsRequest.open('GET', '../search-stopwords.json');
  stopWordsRequest.onload = function () {
    if (this.status != 200) {
      return;
    }
    var stopWords = JSON.parse(this.responseText);
    var docfxStopWordFilter = lunr.generateStopWordFilter(stopWords);
    lunr.Pipeline.registerFunction(docfxStopWordFilter, 'docfxStopWordFilter');
    lunrIndex.pipeline.add(docfxStopWordFilter);
  }
  stopWordsRequest.send();

  var searchData = {};
  var searchDataRequest = new XMLHttpRequest();

  searchDataRequest.open('GET', '../index.json');
  searchDataRequest.onload = function () {
    if (this.status != 200) {
      return;
    }
    searchData = JSON.parse(this.responseText);
    for (var prop in searchData) {
      if (searchData.hasOwnProperty(prop)) {
        lunrIndex.add(searchData[prop]);
      }
    }
    postMessage({ e: 'index-ready' });
  }
  searchDataRequest.send();

  onmessage = function (oEvent) {
    var q = oEvent.data.q;
    var hits = lunrIndex.search(q);
    var results = [];
    hits.forEach(function (hit) {
      var item = searchData[hit.ref];
      results.push({ 'href': item.href, 'title': item.title, 'keywords': item.keywords });
    });
    postMessage({ e: 'query-ready', q: q, d: results });
  }
})();