<script type="text/javascript">
    function AddToCart() {
        var context = SP.ClientContext.get_current();
        var siteUrl = 'https://keoic.sharepoint.com/sites/ProjectSites/test/';
        var clientContext = new SP.ClientContext(siteUrl);
        var web = context.get_web();
        context.load(web);

        var sourceId = SP.ListOperation.Selection.getSelectedList();
        var source = web.get_lists().getById(sourceId);


        var oList = context.get_web().get_lists().getByTitle('Chart');
        context.load(oList);

        var selectedItems = SP.ListOperation.Selection.getSelectedItems(context);
      //  alert('debut');
        for (var i in selectedItems) {
            var currentItem = source.getItemById(selectedItems[i].id);
            context.load(currentItem);
            context.executeQueryAsync(Function.createDelegate(this, test), Function.createDelegate(this, error));
        }


        function test(sender, args) {
           // alert('test');
            var itemCreateInfo = new SP.ListItemCreationInformation();
            var oListItem = oList.addItem(itemCreateInfo);
            oListItem.set_item('Title', currentItem.get_item('Title'));
            oListItem.set_item('Item', currentItem.get_item('Item'));
            oListItem.set_item('Product_x0020_Name', currentItem.get_item('Product_x0020_Name'));
            oListItem.set_item('Description', currentItem.get_item('Description'));
            oListItem.set_item('Price', currentItem.get_item('Price'));
            oListItem.set_item('Department', currentItem.get_item('Department'));
            oListItem.set_item('Branch', currentItem.get_item('Branch'));


            oListItem.update();
            oList.update();
            context.executeQueryAsync(success);
         //   alert('done');
        }
        function success(sender, args) {
            alert('Added to chart!');
           // window.location.reload(true);
        }

        function error(sender, args) { alert('error'); } ""
    }
</script>
<input name="btnApprove" onclick="AddToCart()" type="button" value="Add To Cart"/>