State (Statecode and statuscode) change through a JavaScript

We can find a nice code on status changes here. I tried to make it more generalised as below and it works for me.

SetStateRequest = function (_entityname, entityid, _state, _status)
{
    var requestMain = ""
    requestMain += "<s:Envelope xmlns:s=\"http://schemas.xmlsoap.org/soap/envelope/\">";
    requestMain += "  <s:Body>";
    requestMain += "    <Execute xmlns=\"http://schemas.microsoft.com/xrm/2011/Contracts/Services\" xmlns:i=\"http://www.w3.org/2001/XMLSchema-instance\">";
    requestMain += "      <request i:type=\"b:SetStateRequest\" xmlns:a=\"http://schemas.microsoft.com/xrm/2011/Contracts\" xmlns:b=\"http://schemas.microsoft.com/crm/2011/Contracts\">";
    requestMain += "        <a:Parameters xmlns:c=\"http://schemas.datacontract.org/2004/07/System.Collections.Generic\">";
    requestMain += "          <a:KeyValuePairOfstringanyType>";
    requestMain += "            <c:key>EntityMoniker</c:key>";
    requestMain += "            <c:value i:type=\"a:EntityReference\">";
    requestMain += "              <a:Id>" + entityid + "</a:Id>";
    requestMain += "              <a:LogicalName>" + _entityname + "</a:LogicalName>";
    requestMain += "              <a:Name i:nil=\"true\" />";
    requestMain += "            </c:value>";
    requestMain += "          </a:KeyValuePairOfstringanyType>";
    requestMain += "          <a:KeyValuePairOfstringanyType>";
    requestMain += "            <c:key>State</c:key>";
    requestMain += "            <c:value i:type=\"a:OptionSetValue\">";
    requestMain += "              <a:Value>" + _state + "</a:Value>";
    requestMain += "            </c:value>";
    requestMain += "          </a:KeyValuePairOfstringanyType>";
    requestMain += "          <a:KeyValuePairOfstringanyType>";
    requestMain += "            <c:key>Status</c:key>";
    requestMain += "            <c:value i:type=\"a:OptionSetValue\">";
    requestMain += "              <a:Value>" + _status + "</a:Value>";
    requestMain += "            </c:value>";
    requestMain += "          </a:KeyValuePairOfstringanyType>";
    requestMain += "        </a:Parameters>";
    requestMain += "        <a:RequestId i:nil=\"true\" />";
    requestMain += "        <a:RequestName>SetState</a:RequestName>";
    requestMain += "      </request>";
    requestMain += "    </Execute>";
    requestMain += "  </s:Body>";
    requestMain += "</s:Envelope>";
    var req = new XMLHttpRequest();
    req.open("POST", _getServerUrl(), false)
    // Responses will return XML. It isn't possible to return JSON.
    req.setRequestHeader("Accept", "application/xml, text/xml, */*");
    req.setRequestHeader("Content-Type", "text/xml; charset=utf-8");
    req.setRequestHeader("SOAPAction", "http://schemas.microsoft.com/xrm/2011/Contracts/Services/IOrganizationService/Execute");
    var successCallback = null;
    var errorCallback = null;
    req.onreadystatechange = function () { SetStateResponse(req, successCallback, errorCallback); };
    req.send(requestMain);
}

SetStateResponse = function (req, successCallback, errorCallback)
{
    if (req.readyState == 4)
    {
        if (req.status == 200)
        {
            if (successCallback != null)
            { successCallback(); }
        }
        else
        {
            errorCallback(SDK.SAMPLES._getError(req.responseXML));
        }
    }
}

Also need below two supportive methods.

_getServerUrl = function ()
{
    var OrgServicePath = "/XRMServices/2011/Organization.svc/web";
    var serverUrl = "";
    if (typeof GetGlobalContext == "function")
    {
        var context = GetGlobalContext();
        serverUrl = context.getServerUrl();
    }
    else
    {
        if (typeof Xrm.Page.context == "object")
        {
            serverUrl = Xrm.Page.context.getServerUrl();
        }
        else
        { throw new Error("Unable to access the server URL"); }
    }
    if (serverUrl.match(/\/$/))
    {
        serverUrl = serverUrl.substring(0, serverUrl.length - 1);
    }
    return serverUrl + OrgServicePath;
}

_getError = function (faultXml)
{
    var errorMessage = "Unknown Error (Unable to parse the fault)";
    if (typeof faultXml == "object")
    {
        try
        {
            var bodyNode = faultXml.firstChild.firstChild;
            //Retrieve the fault node
            for (var i = 0; i < bodyNode.childNodes.length; i++)
            {
                var node = bodyNode.childNodes[i];
                if ("s:Fault" == node.nodeName)
                {
                    for (var j = 0; j < node.childNodes.length; j++)
                    {
                        var faultStringNode = node.childNodes[j];
                        if ("faultstring" == faultStringNode.nodeName)
                        {
                            errorMessage = faultStringNode.text;
                            break;
                        }
                    }
                    break;
                }
            }
        }
        catch (e) { };
    }
    return new Error(errorMessage);
}

Few examples I tried;
Deactivating an account -> SetStateRequest("account", _accountid, 1, 2)
Changing a Salesorder to submitted state -> SetStateRequest("salesorder", _salesorderid, 1, 3)
Disqualifying a lead with reason "No longer interested" -> SetStateRequest("lead", _leadid, 2, 6)

Anyway, still I don’t know whether this works for all the entities... but so far so good :-)