Internet Archive directory listing searcher v2.2

/* Internet Archive directory listing searcher v2.2 */

if(document.location.pathname.search("/download/") == 0) /* if directory listing viewed */ {

var listing = document.getElementsByClassName("download-directory-listing")[0];

// add file counter above list

var span = document.createElement("span");

span.innerHTML="This directory has ";

span.innerHTML+=list_items.length-2;

if (list_items.length-2 == 1) span.innerHTML += " item.";

else span.innerHTML += " items.";

listing.insertBefore(span, listing.getElementsByTagName("pre")[0]);

// create search bar in memory before inserting

var search_bar = document.createElement("input");

search_bar.placeholder="search files";

search_bar.onkeyup=search_list;

search_bar.style.marginRight="0.5em";

// create clear button and search result counter in memory before inserting

var search_clear_button = document.createElement("button");

search_clear_button.style.marginRight="1em";

search_clear_button.innerHTML="clear";

search_clear_button.onclick=clear_search;

// create "inverted" check box in memory

var inverted_checkbox = document.createElement("input");

inverted_checkbox.type = "checkbox";

inverted_checkbox.onclick = search_list; // repeat search after changing mode

inverted_checkbox.style.marginRight="0.5em";

// create checkbox label

var inverted_checkbox_label = document.createElement("label");

inverted_checkbox_label.appendChild(inverted_checkbox);

var span = document.createElement("span");

inverted_checkbox_label.appendChild(span);

inverted_checkbox_label.lastChild.innerHTML="invert results";

inverted_checkbox_label.style.marginRight="1em";

// create "case-sensitive" check box in memory

var case_sensitive_checkbox = document.createElement("input");

case_sensitive_checkbox.type = "checkbox";

case_sensitive_checkbox.onclick = search_list; // repeat search after changing mode

case_sensitive_checkbox.style.marginRight="0.5em";

// create checkbox label

var case_sensitive_checkbox_label = document.createElement("label");

case_sensitive_checkbox_label.appendChild(case_sensitive_checkbox);

var span = document.createElement("span");

case_sensitive_checkbox_label.appendChild(span);

case_sensitive_checkbox_label.lastChild.innerHTML="case-sensitive";

case_sensitive_checkbox_label.style.marginRight="1em";

// create result counter field in memory

var result_counter = document.createElement("span");

var listing_hr = listing.getElementsByTagName("hr")[0];

listing.insertBefore(search_bar, listing_hr); // insert search bar into page

listing.insertBefore(search_clear_button, listing_hr); // insert "clear" button into page

listing.insertBefore(inverted_checkbox_label, listing_hr); // insert "invert results" checkbox

listing.insertBefore(case_sensitive_checkbox_label, listing_hr); // insert "case-sensitive" checkbox

listing.insertBefore(result_counter, listing_hr); // insert result counter into page

search_bar.focus(); // actuate search bar without clicking or tapping on it

var list_items = listing.getElementsByTagName("tr");

var count = 0; // initialize counter for "for" loops

var result_count = 0; // initialize result counter

}

function search_list() {

result_count = 0; // reset result counter

search_bar.setAttribute("value",search_bar.value); // compatibility

var search_input = search_bar.value;

var searched_content = ""; // initialize to eliminate JSHint error

if (! case_sensitive_checkbox.checked) {

// convert to case-insensitive

search_input = search_input.toLowerCase();

}

// The inverted checkbox status is not checked inside the "for" loop for efficiency. A pice of code that needs to be run many times should be a short as possible for improving performance.

if (! inverted_checkbox.checked) /* meaning unchecked */ {

for (count=2 /* skip "go to parent directory" */; count < list_items.length; count++) {

// perform search

searched_content=list_items[count].innerHTML;

if (! case_sensitive_checkbox.checked) {

// convert to case-insensitive if checkbox not check

searched_content = searched_content.toLowerCase();

}

if (searched_content.search(search_input)<0) /* if no match */ {

list_items[count].style.display="none"; // hide

} else {

list_items[count].style.display=""; // fall back to original CSS by resetting to undefined

result_count++; // count results

}

} else {

for (count=2 /* skip "go to parent directory" */; count < list_items.length; count++) {

// perform inverted search

searched_content=list_items[count].innerHTML;

if (! case_sensitive_checkbox.checked) {

// convert to case-insensitive if checkbox not check

searched_content = searched_content.toLowerCase();

}

if (searched_content.search(search_input)>-1) /* if match */ {

list_items[count].style.display="none"; // hide

} else {

list_items[count].style.display=""; // fall back to original CSS by resetting to undefined

result_count++; // count results

}

result_counter.innerHTML = result_count;

if (result_count == 1) result_counter.innerHTML += " result"; // singular

else result_counter.innerHTML += " results"; // plural

if (result_count == 0) result_counter.innerHTML = "no results";

// Removing result counter if the search bar is empty because the number of items in the directory can be seen below anyway.

if (search_bar.value=="") result_counter.innerHTML = "";

}

function clear_search() {

search_bar.value="";

search_bar.focus();

search_list();

}