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Use JSON search index with JS fallback

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This allows the search index to be loaded asynchronously, and should
use fewer resources as it doesn't have to execute the JS.
JS loading is kept as a fallback for CORS issues with file:// URIs in Chrome.
This commit is contained in:
Matt Ickstadt 2018-06-13 14:51:15 -05:00
parent 62c8311301
commit e1a46d213e
2 changed files with 22 additions and 15 deletions
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14
src/renderer/html_handlebars/search.rs
View file

@ -24,14 +24,15 @@ pub fn create_files(search_config: &Search, destination: &Path, book: &Book) ->
render_item(&mut index, &search_config, &mut doc_urls, item)?;
}
let index = write_to_js(index, &search_config, doc_urls)?;
let index = write_to_json(index, &search_config, doc_urls)?;
debug!("Writing search index ✓");
if index.len() > 10_000_000 {
warn!("searchindex.js is very large ({} bytes)", index.len());
warn!("searchindex.json is very large ({} bytes)", index.len());
}
if search_config.copy_js {
utils::fs::write_file(destination, "searchindex.js", index.as_bytes())?;
utils::fs::write_file(destination, "searchindex.json", index.as_bytes())?;
utils::fs::write_file(destination, "searchindex.js", format!("window.search = {};", index).as_bytes())?;
utils::fs::write_file(destination, "searcher.js", searcher::JS)?;
utils::fs::write_file(destination, "mark.min.js", searcher::MARK_JS)?;
utils::fs::write_file(destination, "elasticlunr.min.js", searcher::ELASTICLUNR_JS)?;
@ -164,10 +165,7 @@ fn render_item(
Ok(())
}
/// Exports the index and search options to a JS script which stores the index in `window.search`.
/// Using a JS script is a workaround for CORS in `file://` URIs. It also removes the need for
/// downloading/parsing JSON in JS.
fn write_to_js(index: Index, search_config: &Search, doc_urls: Vec<String>) -> Result<String> {
fn write_to_json(index: Index, search_config: &Search, doc_urls: Vec<String>) -> Result<String> {
use std::collections::BTreeMap;
use self::elasticlunr::config::{SearchBool, SearchOptions, SearchOptionsField};
@ -225,7 +223,7 @@ fn write_to_js(index: Index, search_config: &Search, doc_urls: Vec<String>) -> R
let json_contents = serde_json::to_value(&json_contents)?;
let json_contents = serde_json::to_string(&json_contents)?;
Ok(format!("window.search = {};", json_contents))
Ok(json_contents)
}
fn clean_html(html: &str) -> String {

23
src/theme/searcher/searcher.js
View file

@ -247,12 +247,12 @@ window.search = window.search || {};
return teaser_split.join('');
}
function init() {
results_options = window.search.results_options;
search_options = window.search.search_options;
searchbar_outer = window.search.searchbar_outer;
doc_urls = window.search.doc_urls;
searchindex = elasticlunr.Index.load(window.search.index);
function init(config) {
results_options = config.results_options;
search_options = config.search_options;
searchbar_outer = config.searchbar_outer;
doc_urls = config.doc_urls;
searchindex = elasticlunr.Index.load(config.index);
// Set up events
searchicon.addEventListener('click', function(e) { searchIconClickHandler(); }, false);
@ -462,7 +462,16 @@ window.search = window.search || {};
showResults(true);
}
init();
fetch('searchindex.json')
.then(response => response.json())
.then(json => init(json))
.catch(error => { // Try to load searchindex.js if fetch failed
var script = document.createElement('script');
script.src = 'searchindex.js';
script.onload = () => init(window.search);
document.head.appendChild(script);
});
// Exported functions
search.hasFocus = hasFocus;
})(window.search);