Client-side concurrency control

As described in the previous recipe, sever-side concurrency control can be enabled when making a server-side UpdateRequest or DeleteRequest, however, client-side concurrency is not currently available while using the frontend UI.

In this recipe, we will create a custom JavaScript library that checks for concurrency when saving the record, essentially enabling a client-side optimistic concurrency control mechanism. We will then enable it for the contact entity being used.

Getting ready

In order to build this customization, you will require the System Customizer or higher security role. End users, however, will only require read/create/update access to the entities.

How to do it...

1. Navigate to Settings | Solutions | Packt.
2. Click on Web Resources and click on New, enter packt_/js/concurrency.js as the name, select JScript from Type, and then click on Text Editor.
3. Copy and insert the following piece of code:

var packtNs = packtNs || {}; 
packtNs.concurrency = packtNs...