Hides comments on a page via regular expression search fields
// ==UserScript==
// @name Hacker News Comment Search Filter
// @description Hides comments on a page via regular expression search fields
// @version 1.0.0
// @author sdca
// @namespace sdca.hncsf
// @include https://news.ycombinator.com/item?id=*
// @grant GM_addStyle
// ==/UserScript==
(function(){
// Delay comment count threshold
var filter_delay_min_comments = 300;
// Delay time in seconds
var filter_delay_time = 0.5;
if(document.querySelector('.comment-tree')) {
var filter_count = 0;
var filter_delay;
if(filter_delay_min_comments >= (document.querySelectorAll('.athing').length - 1)) {
filter_delay_time = 0;
}
GM_addStyle('#fc-wrapper{margin:0 20px;} .filter-comments{width:100%;} .fid{display:none;}');
document.querySelector('.comment-tree').insertAdjacentHTML('beforebegin', '<div id="fc-wrapper"><form id="fc-form"><input id="filter-comments-add" type="button" value="+"/></form></div>');
document.getElementById('filter-comments-add').addEventListener('click', filter_add, false);
document.getElementById("fc-form").addEventListener("submit", function(event){
event.preventDefault();
});
filter_add();
}
function filter_add() {
filter_count++;
document.getElementById('filter-comments-add').insertAdjacentHTML('beforebegin', '<input id="filter-comment-'+filter_count+'" class="filter-comments" placeholder="Search Comments..." />');
}
function filter_comments() {
var re = new RegExp();
var st = this.value;
var ex = false;
var fid = this.id.replace(/^filter-comment-/, '');
if(this.value.charAt(0) == '-') {
ex = true;
st = st.replace(/^-/, '');
if(this.value == '-') {
ex = false;
}
}
try {
re = new RegExp(st, 'i');
} catch(err){}
if(re !== 'undefined') {
clearTimeout(filter_delay);
filter_delay = setTimeout(function() {
Array.prototype.forEach.call(document.querySelectorAll('.athing'), function(el, i){
if (!i) return;
var comment = el.querySelector('.default').textContent;
var filter_remove = false;
if(ex === false) {
if(re.test(comment)) {
el.classList.remove('fid'+fid);
filter_remove = true;
} else {
el.classList.add('fid','fid'+fid);
}
} else {
if(!re.test(comment)) {
el.classList.remove('fid'+fid);
filter_remove = true;
} else {
el.classList.add('fid','fid'+fid);
}
}
if(filter_remove === true && el.classList.contains('fid')) {
var filter_remain = false;
for (var filter = 0; filter < filter_count; filter++) {
if(el.classList.contains('fid'+filter)) {
filter_remain = true;
}
}
if(!filter_remain) {
el.classList.remove('fid');
}
}
});
}, filter_delay_time * 1000);
}
}
document.addEventListener('input', function (event) {
var el = event.target, index = -1;
while (el && ((index = Array.prototype.indexOf.call(document.querySelectorAll('.filter-comments'), el)) === -1)) {
el = el.parentElement;
}
if (index > -1) {
filter_comments.call(el, event);
}
});
document.addEventListener('keydown', function (event) {
var el = event.target, index = -1;
while (el && ((index = Array.prototype.indexOf.call(document.querySelectorAll('.filter-comments'), el)) === -1)) {
el = el.parentElement;
}
if (index > -1) {
if(event.keyCode == 27) {
el.value = '';
filter_comments.call(el, event);
}
}
});
})();