Complete demo MacroPartial from 24days.in/umbraco article

FacetedSearch.cshtml

@using BoboBrowse.Api
@using BoboBrowse.Facets
@using BoboBrowse.Facets.impl
@using Examine;
@using Examine.LuceneEngine.Providers
@using Lucene.Net.Search
@inherits Umbraco.Web.Macros.PartialViewMacroPage
@{
    // creating a browse request
    var browseRequest = new BrowseRequest
    {
        Count = 10, // Page size
        Offset = 0, // Page size * Page Number
        FetchStoredFields = true, // Fetch data from stored fields
        Sort = new[] { new SortField("updateDate", 3, true) }
    };

    // read facet selections from the form post
    foreach(string key in Request.Form) {
        if(!key.StartsWith("facet_")) {
            continue;
        }
        var facet = key.Substring(6);
        // add a selection
        BrowseSelection sel = new BrowseSelection(facet);
        sel.AddValue(Request.Form[key]);
        browseRequest.AddSelection(sel);
    }

    // parse a query
    var query = Request["q"];
    if(!string.IsNullOrEmpty(query)) {
        var parser = new Lucene.Net.QueryParsers.QueryParser(Lucene.Net.Util.Version.LUCENE_29, "bodyText", new Lucene.Net.Analysis.KeywordAnalyzer());
        Query q = parser.Parse(query);
        browseRequest.Query = q;
    }

    ICollection<FacetHandler> handlerList = new List<FacetHandler>();

    // define the facet output spec used for all facets
    var facetSpec = new FacetSpec { OrderBy = FacetSpec.FacetSortSpec.OrderHitsDesc, ExpandSelection = true };
    
    // Add a facet
    var fieldName = "category";
    handlerList.Add(new SimpleFacetHandler(fieldName));
    browseRequest.SetFacetSpec(fieldName, facetSpec);

    var searchProvider = ExamineManager.Instance.SearchProviderCollection["ExternalSearcher"] as LuceneSearcher;
    var searcher = (IndexSearcher)searchProvider.GetSearcher();
    var reader = searcher.GetIndexReader();

    // decorate lucene reader with a bobo index reader
    BoboIndexReader boboReader = BoboIndexReader.GetInstance(reader, handlerList);

    // perform browse
    IBrowsable browser = new BoboBrowser(boboReader);
    var results = browser.Browse(browseRequest);

    // create collection of Umbraco NodeIds from Hits.
    var resultNodeIds = results.Hits.Select(x => x.StoredFields.Get("id")).ToList();
   
}
<form method="post">
    <div class="row">
        <div class="9u">
            <label for="q">Search</label>
            <input name="q" id="q" value="@Request["q"]" />
            <input type="submit" value="Search" />
        </div>
    </div>

    <div class="row">
        <div class="3u">
            @foreach (var facet in results.FacetMap)
            {
                <h4>@facet.Key</h4>
                <ul>
                    @foreach (var facetValue in facet.Value.GetFacets())
                    {
                        var chck = (Request["facet_" + facet.Key] ?? string.Empty).Contains(@facetValue.Value.ToString()) ? "selected" : null;
                        <li><label><input type="checkbox" name="facet_@facet.Key" value="@facetValue.Value" checked="@chck" />@facetValue.Value</label>: @facetValue.HitCount</li>
                    }
                </ul>
            }
            <input type="submit" value="Update" />
        </div>
        <div class="6u">
            <ul>
            @foreach (var resultNodeId in resultNodeIds)
            {
                var node = Umbraco.Content(resultNodeId);
                <li><a href="@node.Url">@node.Name</a></li>
            }
            </ul>
        </div>
    </div>
</form>

### Great