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function all_paragraphs() {
return Array.from(document.querySelectorAll("p"));
}
function all_pres() {
return Array.from(document.querySelectorAll("pre"));
}
function all_lists() {
return Array.from(document.querySelectorAll("li"));
}
function all_anchors() {
return Array.from(document.querySelectorAll("a"));
}
function all_headers() {
return Array.from([
Array.from(document.querySelectorAll("h1")),
Array.from(document.querySelectorAll("h2")),
Array.from(document.querySelectorAll("h3"))
].flat());
}
function all_searchable_elements() {
return Array.from([
all_paragraphs(),
all_pres(),
all_lists(),
all_headers(),
all_anchors()
].flat());
}
function hide_element(element) {
element.style.color = "rgb(0, 0, 0, 0.2)";
}
function show_element(element) {
element.style.color = "";
}
function show_all_searchable_elements() {
all_searchable_elements().forEach(show_element);
}
function does_element_has_word(element, word) {
return element.innerText
.toLowerCase()
.includes(word.toLowerCase());
}
function perform_search(search_text) {
search_text = search_text || "";
show_all_searchable_elements();
var result_count = 0;
document.getElementById('search-count').innerHTML = " ";
if (search_text.length < 3) return;
var tokens = search_text.split(" ");
all_searchable_elements().forEach(function (element) {
tokens.forEach(function(word) {
if (does_element_has_word(element, word)) {
result_count += 1;
show_element(element);
} else {
hide_element(element);
}
});
});
document.getElementById('search-count').innerHTML = result_count.toString() + " result(s) found.";
}
function add_search() {
var search_html = `
<div style='padding: 10px; border: solid 1px silver; background-color: white;'>
<input placeholder='search' type='text' id='search-term' style='width: 100%; padding: 5px; margin-bottom: 3px;' />
<div id='search-count'> </div>
</div>
`;
// create search div
var search_div = document.createElement("div");
search_div.innerHTML = search_html;
document.body.insertBefore(search_div, document.body.firstChild);
search_div.style.position = 'fixed';
search_div.style.right = '10px';
search_div.style.width = '200px';
// wire up incremental search
var search_textbox = document.getElementById("search-term");
search_textbox.onkeydown = function() { perform_search(search_textbox.value); };
}
document.addEventListener('DOMContentLoaded', function() {
add_search();
}, false);
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