neagent_by.user.js

// ==UserScript==
// @name neagent.by hide ads
// @description Hide uninteresting ads from view
// @author yumaa.verdin@gmail.com
// @include http://neagent.by/*
// ==/UserScript==

/* jshint browser: true, jquery: true, -W099, smarttabs: true, undef: true, unused: true, bitwise: true, curly: true, quotmark: single, trailing: true */
(function() {
	'use strict';

	if (window.location.hostname != 'neagent.by') {
		return;
	}

	// name of local storage key
	var storageKey = 'yu_hidden_ads';

	// get hidden ads from local storage, as object
	function getHidden() {
		var stored = localStorage.getItem(storageKey),
		    hidden;
		try {
			if (stored) {
				hidden = JSON.parse(stored);
			}
		} catch(e) {}
		if (!hidden) {
			hidden = {};
		}
		return hidden;
	}

	// save hidden ads to local storage
	function setHidden(hidden) {
		localStorage.setItem(storageKey, JSON.stringify(hidden));
	}

	// hide ad and save it ID to local storage
	function hideAd(e) {
		var $el = $(e.currentTarget).parents('.itm'),
		    id = $el.attr('id');
		$el.hide();

		var hidden = getHidden();
		hidden[id] = 1;
		setHidden(hidden);
	}

	// hide all already hidden ads
	var hidden = getHidden(),
	    id,
	    hiddenCount = 0,
	    hiddenOnPageCount = 0;
	for (id in hidden) {
		var $ad = $('#' + id);
		hiddenCount++;
		if ($ad.length !== 0) {
			hiddenOnPageCount++;
			$ad.hide();
		}
	}

	// add crosses
	$('.itm table.itm_head td:last-child').each(function() {
		var $cross = $(
			'<div style="float:right;font-size:2em;font-weight:bold;color:red;cursor:pointer;">&times;</div>'
		).click(hideAd);
		$(this).prepend($cross);
	});

	// add 'show all' button
	var $check = $(
		'<span style="margin-left:20px;color:green;cursor:pointer;">' +
		'<span style="vertical-align:middle;font-size:2em;font-weight:bold;">&#10004;</span>' +
		'show all (' + hiddenCount + ' hidden ads total, ' + hiddenOnPageCount + ' on this page)' +
		'</span>'
	).click(function() {
		setHidden(null);
		location.reload();
	});
	$('.orderoptions').append($check);

})();