Hacker News Spam Blocker

hacker_news_spam_blocker.user.js

// ==UserScript==
// @name        block it
// @namespace   tranch
// @description block item by domain on hacknews
// @include     http://news.dbanotes.net/*
// @version     0.1
// @grant       none
// ==/UserScript==

(function() {
    var DB_NAME = 'HackerNewBlackList';
    var items = document.querySelectorAll('td.title a'), item;
    var black_list = JSON.parse(localStorage.getItem(DB_NAME)) || [];
    var block_button;
    
    window.tch_block_item = function (item_id) {
        item = document.querySelector('#' + item_id);
        var domain = item.href.split('/')[2];
        var json = localStorage.getItem('HackerNewBlackList') || '[]';
        var black_list = JSON.parse(json);
        black_list.push(domain);
        localStorage.setItem('HackerNewBlackList', JSON.stringify(black_list));
        tch_hide_item(item);
    };
    
    window.tch_hide_item = function (node) {
        node.parentNode.parentNode.nextSibling.nextSibling.style.display = 'none';
        node.parentNode.parentNode.nextSibling.style.display = 'none';
        node.parentNode.parentNode.style.display = 'none';
    };
    
    for (var i=0; i<items.length; i++) {
        item = items[i];
        item.id = 'tread_' + i;
        block_button = document.createElement('a');
        block_button.href = 'javascript:tch_block_item("'+item.id+'")';
        block_button.innerHTML = 'block';
        
        option_container = item.parentNode.parentNode.nextSibling.firstChild.nextSibling;
        option_container.innerHTML += ' | ';
        option_container.appendChild(block_button);
       
        for (var ib=0; ib<black_list.length; ib++) {
            if (item.href.contains(black_list[ib])) {
                tch_hide_item(item);
            }
        }
    }
})()