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p15 / Steam trade offer helper - no more Unavailable For Trade

// ==UserScript==
// @name        Steam trade offer helper - no more Unavailable For Trade
// @namespace   https://steamcommunity.com/id/biscuithk/
// @description Gray out the items that are in the pending trade offers.
// @version     150615
// @author      Biscuit
// @include     /^https:\/\/steamcommunity\.com\/tradeoffer.*/
// @icon        http://store.steampowered.com/favicon.ico
// @grant       none
// ==/UserScript==

$J(function() {
	var TradeOfferID, TradeOfferSelector = '', itemsA, itemsB;
	
	if (/^https:\/\/steamcommunity\.com\/tradeoffer\/(\d+)/.test(window.location.href)) {
		TradeOfferID = /^https:\/\/steamcommunity\.com\/tradeoffer\/(\d+)/.exec(window.location.href)[1];
		TradeOfferSelector = 'div:not([id$="_' + TradeOfferID + '"]).tradeoffer > '
		console.log('Trade Offer ' + TradeOfferID);
	}
	
	function ModifyStyle(itemsArr) {
		var selector = '';
		for (var i = 0; i < itemsArr.length; i++) {
			selector += 'div[id$="_' + itemsArr[i] + (i==itemsArr.length-1?'"]':'"], ');
		}
		$J('head').append('<style type="text/css">' + selector + ' {filter: blur(2px) grayscale(1) opacity(0.5); -webkit-filter: blur(2px) grayscale(1) opacity(0.5); background-color: #716F6F !important;}</style>');
	}
	
	$J.ajax({
		cache : false,
		context : this,
		success : function(data){
			itemsA = $J(TradeOfferSelector + '.tradeoffer_items_ctn.active > .tradeoffer_items.secondary > .tradeoffer_item_list > .trade_item', data).map(function(){
				return /((\d+)\/){2}(\d+)/g.exec($J(this).data('economy-item'))[3];
			}).get();
			ModifyStyle(itemsA);
			console.log(itemsA);
		},
		type : "GET",
		url : "/my/tradeoffers/"
	});
	
	$J.ajax({
		cache : false,
		context : this,
		success : function(data){
			itemsB = $J(TradeOfferSelector + '.tradeoffer_items_ctn:not(.inactive) > .tradeoffer_items.primary > .tradeoffer_item_list > .trade_item', data).map(function(){
				return /((\d+)\/){2}(\d+)/g.exec($J(this).data('economy-item'))[3];
			}).get();
			ModifyStyle(itemsB);
			console.log(itemsB);
		},
		type : "GET",
		url : "/my/tradeoffers/sent/"
	});
	
});