SortableGridField

Adds drag and drop functionality to SilverStripe 3.0's GridField

Requirments

Download the module from here https://github.com/UndefinedOffset/SortableGridField/downloads
Extract the downloaded archive into your site root so that the destination folder is called SortableGridField, opening the extracted folder should contain _config.php in the root along with other files/folders
Run dev/build?flush=all to re-gernate the manifest
Upon entering the cms and using GridFieldSortableRows component for the first time you make need to add ?flush=all to the end of the address to force the templates to regenerate

To enable sorting on a has_many relationship set up an interger field on your data object.

To enable drag and drop sorting on the grid field add the following to your grid field's config Grid Field Config

:::php
$myGridConfig->addComponent(new GridFieldSortableRows('{Column to store sort}'));

To move an item to another page drag the row over the respective page button and release.