Change Display text of Currency lookup field with Currency Code in Dynamics CRM 2015/16 using JavaScript

Call the Below Function onLoad & On-change Event.

// JScript source code
function ChangeCurrencyLookUpDisplayValue() {
    debugger;
    var lookupData = new Array();
    var lookupItem = new Object();
    var lookup = Xrm.Page.data.entity.attributes.get("transactioncurrencyid");

    if (lookup != null) {
        var displayvalue = '';
        var xmlText = '';

        xmlText += "<s:Envelope xmlns:s=\"http://schemas.xmlsoap.org/soap/envelope/\">"; xmlText += "<s:Body>";
        xmlText += "<Retrieve xmlns=\"http://schemas.microsoft.com/xrm/2011/Contracts/Services\" xmlns:i=\"http://www.w3.org/2001/XMLSchema-instance">";
        xmlText += "<entityName>transactioncurrency</entityName>";
        xmlText += "<id>" + lookup.getValue()[0].id + "</id>";
        xmlText += "<columnSet xmlns:a=\"http://schemas.microsoft.com/xrm/2011/Contracts\">";
        xmlText += "<a:AllColumns>false</a:AllColumns>";
        xmlText += "<a:Columns xmlns:b=\"http://schemas.microsoft.com/2003/10/Serialization/Arrays\">";
        xmlText += "<b:string>isocurrencycode</b:string>";
        xmlText += "</a:Columns>";
        xmlText += "</columnSet>";
        xmlText += "</Retrieve>";
        xmlText += "</s:Body>";
        xmlText += "</s:Envelope>";
        var xHReq = new XMLHttpRequest();


        var url = Xrm.Page.context.getClientUrl() + "/XRMServices/2011/Organization.svc/web";
        xHReq.open("POST", url, false);
        xHReq.setRequestHeader("SOAPAction", "http://schemas.microsoft.com/xrm/2011/Contracts/Services/IOrganizationService/Retrieve");
        xHReq.setRequestHeader("Content-Type", "text/xml; charset=utf-8");
        xHReq.setRequestHeader("Accept", "application/xml,text/xml,*/*");
        xHReq.send(xmlText);

        //Capture the result. 
        var resultXml = xHReq.responseXML;
        var varray = new Array();

        //Check forerrors. 

        var result = resultXml.getElementsByTagName("a:KeyValuePairOfstringanyType");
        if (result.length > 0) {
            displayvalue = result[0].childNodes[1].lastChild.data;
        }
        if (displayvalue != '') {
            lookupItem.name = displayvalue;
            lookupData[0] = lookupItem;
            lookup.DataValue = lookupData;
            Xrm.Page.getAttribute("transactioncurrencyid").
                setValue([{
                    id: lookup.getValue()[0].id,
                    name: displayvalue, entityType: "transactioncurrency"
                }]);
        }

    }
}