var uploader =
{
    "view": "popup",
    "id": "upload_popup",
    "css": "upload_popup",
    "position": "center",
    head: "This window can be moved",
    close: true,
    "modal": true,
    "move": true,
    "width": 600,
    "body": {
        view: "form",
        rows: [
            {
                view: "list",
                id: "mylist",
                type: "uploader",
                minheight: 100,
                autoheight: true,
                borderless: true
            },
            {
                "view": "toolbar",
                "css": "webix_dark",
                "paddingX": 5,
                "cols": [
                    { "view": "icon", "icon": "wxi-plus" },
                    { "view": "label", "label": "Import Trails" },
                    {
                        view: "uploader",
                        id: "uploader_1",
                        value: "Select file",
                        link: "mylist",
                        upload: "php/upload.php",
                        datatype: "json"
                    },
                    { "view": "button", "label": "Close", "width": 80, "click" : close_uploader },
                ]
            },            
        ]
    }
};

var uploader_popup = webix.ui(uploader);

function close_uploader(){
    uploader_popup.hide();
}