JavaScript to Access List Item GUID in SharePoint 2010

The SharePoint 2010 client object model has provided JavaScript means to access SharePoint Lists, Libraries and items, etc.... Below is a sample where I access a SharePoint list item GUID information during a on click event on a list item. The item click is triggered at the XSLT code rendering the custom field. This is the related JavaScript.

Here the item GUID is captured.



var itemID = null;
var item = null;
var currentItemGUID = null;

//Assigned the itemID value coming from XSLT [JavaScript method call on a hyperlinks OnClick() method]

function MyTestFunction() {
    context = new SP.ClientContext.get_current();
     list = context.get_web().get_lists().getById(SP.ListOperation.Selection.getSelectedList());
     item = list.getItemById(itemID);

    context.load(item);
    context.executeQueryAsync(
        function(sender, args) {
            currentItemGUID = item.get_item('UniqueId');
        },
        function(sender, args) {
            alert('Request Failed' + args.get_message() + '\nStackTrace: ' + args.get_stackTrace());
        }, "sp.js");
    
}