jQueryUI functions not working

[synelogic]

The jQueryUI functions are not working because the gridstack.jQueryUI.js file is not loaded.

Change the js variable to the following to rectify the issue.

public $js = [
    'dist/gridstack.js',
    'dist/gridstack.jQueryUI.js',
];

[synelogic]

Another solution would be to change 'dist/gridstack.js' to 'dist/gridstack.all.js'. This will result in the following code:
public $js = [
'dist/gridstack.all.js',
];