The way I've done it is to just have an array of commands and a simple queue thing that keeps retrying its head element until success, triggered by connectivity change or manual user retry.

(This was also useful when our backend had random issues causing 500s sometimes.)

A command has both an AJAX request and a state updating function. It's really easy with a React-like framework because you can just apply the command queue's state changes as part of the main view render, without actually modifying the main state.