DragSelector is a plugin that helps selecting grid rows by dragging the mouse over the rows, developed by Harald Hanek. The initial developer of the original code is Claudio Walser. This plugin is really helpful as it supports selecting multiple rows very quickly. It supports the selection of grid rows in the following ways:

In the following screenshot, we can see the DragSelector plugin in action:

A live demo for this plugin is located at http://harrydeluxe.github.io/extjs-ux/example/grid/dragselector.html. This plugin is licensed under LGPLv3. You can download this plugin at https://github.com/harrydeluxe/extjs-ux/blob/master/ux/grid/plugin/DragSelector.js.