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Hack3l / Steammarket Wear Display CSGOZone

// ==UserScript==
// @name         Steammarket Wear Display CSGOZone
// @namespace    http://www.siffers.de/
// @version      0.2
// @description  Displays wear values for CS:GO weapons in market
// @match        http://steamcommunity.com/market/listings/730/*
// @grant        GM_xmlhttpRequest
// @copyright    2015, Hack3l
// @run-at       document-idle
// ==/UserScript==


var $ = unsafeWindow.jQuery;
function waitForKeyElements (
    selectorTxt,    /* Required: The jQuery selector string that
                        specifies the desired element(s).
                    */
    actionFunction, /* Required: The code to run when elements are
                        found. It is passed a jNode to the matched
                        element.
                    */
    bWaitOnce,      /* Optional: If false, will continue to scan for
                        new elements even after the first match is
                        found.
                    */
    iframeSelector  /* Optional: If set, identifies the iframe to
                        search.
                    */
) {
    var targetNodes, btargetsFound;

    if (typeof iframeSelector == "undefined")
        targetNodes     = $(selectorTxt);
    else
        targetNodes     = $(iframeSelector).contents ()
                                           .find (selectorTxt);

    if (targetNodes  &&  targetNodes.length > 0) {
        btargetsFound   = true;
        /*--- Found target node(s).  Go through each and act if they
            are new.
        */
        targetNodes.each ( function () {
            var jThis        = $(this);
            var alreadyFound = jThis.data ('alreadyFound')  ||  false;

            if (!alreadyFound) {
                //--- Call the payload function.
                var cancelFound     = actionFunction (jThis);
                if (cancelFound)
                    btargetsFound   = false;
                else
                    jThis.data ('alreadyFound', true);
            }
        } );
    }
    else {
        btargetsFound   = false;
    }

    //--- Get the timer-control variable for this selector.
    var controlObj      = waitForKeyElements.controlObj  ||  {};
    var controlKey      = selectorTxt.replace (/[^\w]/g, "_");
    var timeControl     = controlObj [controlKey];

    //--- Now set or clear the timer as appropriate.
    if (btargetsFound  &&  bWaitOnce  &&  timeControl) {
        //--- The only condition where we need to clear the timer.
        clearInterval (timeControl);
        delete controlObj [controlKey];
    }
    else {
        //--- Set a timer, if needed.
        if ( ! timeControl) {
            timeControl = setInterval ( function () {
                    waitForKeyElements (    selectorTxt,
                                            actionFunction,
                                            bWaitOnce,
                                            iframeSelector
                                        );
                },
                300
            );
            controlObj [controlKey] = timeControl;
        }
    }
    waitForKeyElements.controlObj   = controlObj;
}

function addButtonsToPage(){
    itemlist = document.getElementsByClassName("market_listing_row");
    for(var i = 0;i<itemlist.length;i++){
        (function(i){
        var buybutton = itemlist[i].getElementsByClassName("market_actionmenu_button");
        var button = document.createElement("button");
        button.innerHTML = "Load Wear";
        button.onclick = function(){getWear(buybutton);};
        button.className = "swd-wearbutton"; 
        console.log(itemlist[i].getElementsByClassName("swd-wearbutton"));
        if(itemlist[i].getElementsByClassName("swd-wearbutton").length < 1){
            itemlist[i].appendChild(button);
            var resultp = document.createElement("p");
            resultp.className = "swd-resultp";
            itemlist[i].appendChild(resultp);
        }
        })(i);
    }
    
}

function getWear(buybutton){
    unsafeWindow.$J(buybutton).click();
    var tradelink = document.querySelectorAll(".popup_menu_item:not(.tight):not(.notification_ctn)")[4];
    console.log(tradelink);
    unsafeWindow.HideMenuFast( buybutton, 'market_action_popup' );
    GM_xmlhttpRequest({
        method: "GET",
        url: "http://www.csgozone.net/_service/user?type=marketInspect&link="+encodeURIComponent(tradelink),
        onload: function(response) {
            var wear = JSON.parse(response.responseText).wear;
            console.log(buybutton);
            buybutton[0].parentElement.parentElement.getElementsByClassName("swd-resultp")[0].innerHTML= "Wear: "+wear;
        }
    });
}

waitForKeyElements("div.market_listing_table_header",addButtonsToPage);