print.js

var reponseArray = [];
// Printing Job
async function printer(barcode,productLine,numberOfCopies,rcvdDate) {
    var xmlHttp = new XMLHttpRequest();
    xmlHttp.open("GET", '/barcode/get-script-url?barcode='+barcode+'&productLine='+productLine+'&numberOfCopies='+numberOfCopies+'&rcvdDate='+rcvdDate+'', false); // false for synchronous request
    xmlHttp.send(null);
    var response = await xmlHttp.responseText;
    var responseObj = JSON.parse(response);

    loadScript(responseObj.scripturl, function () {
        window.jsWebClientPrint.print('useDefaultPrinter=true' + '&printerName=' + $('#installedPrinterName').val());
    });
}

// Loading the printing script
async function loadScript(url, callback) {
    var script = document.createElement("script");
    script.type = "text/javascript";
    if (script.readyState) {
        script.onreadystatechange = function () {
            if (script.readyState == "loaded" ||
                script.readyState == "complete") {
                script.onreadystatechange = null;
                callback();
            }
        };
    } else {
        script.onload = function () {
            callback();
        };
    }
    script.src = url;
    await document.getElementsByTagName("head")[0].appendChild(script);
}