load.js

function LoadDocument(filename) {
     $('.alert').show();

    var bDocument;
    var serviceURL = "@Url.Action("LoadDocument", "TX")";

    // send document to controller
    $.ajax({
        type: "GET",
        url: serviceURL,
        data: {
            filename: filename
        },
        success: successFunc,
        error: errorFunc
    });
}

function successFunc(data, status) {
    TXDocumentViewer.loadDocument(data, "loaded.tx");
    TXDocumentViewer.toggleSidebar();

    $('.alert').hide();
}

function errorFunc() {
    alert("Error");
}