Browser support WIP using SQL.js

[brodycj]

In followup to discussion in #576 (initial browser support WIP) I have started again using kripken / sql.js, actually sql-memory-growth.js which is now fetched from edge WIP version of litehelpers / Cordova-sqlite-storage-dependencies. This is a major feature for the planned June 2018 release (#773).

This is a WORK IN PROGRESS in the cb-browser-sqljs-wip branch with a number of missing items. @brodybits expects to force push updates to this WIP branch.

To try this in a TEST project, be sure to completely remove any existing sqlite plugin and then add the WIP version branch as follows (using the following Cordova CLI):

cordova plugin add https://github.com/litehelpers/Cordova-sqlite-storage#cb-browser-sqljs-wip

NOTE that this is NOT expected to work in multi-page apps due to lack of actual persistence. (It SHOULD be possible to implement a workaround solution for persistence across page changes, at least in theory. I can look further into this idea if there is sufficient demand from the user community.)

P.S. I actually had to use sql-memory-growth.js to prevent "cannot enlarge memory arrays" errors when running the test suite.

P.S.S. It should be possible to implement pre-populated database feature on the browser platform using the File API, at least in theory. I can look further into this idea if there is sufficient demand from the user community.

[humblecoder]

Definitely going to need persistence. Otherwise, we might as well just use sql.js from the start . . . no? 🤔

[brodycj]

@humblecoder this plugin would only use SQL.js on the browser platform, with missing persistence, to support easier testing for app developers. Motivation for using SQL.js, with lack of persistence, is described in #576 (comment).

Support for browser platform with persistence working is possible, I can think of the following alternatives:

• Add an option to openDatabase() to simulate most of the functionality of this plugin, including persistence, as I had already proposed in WIP: initial browser platform #576
• Add a hack to read & write the database to a file as documented in:
  • https://github.com/kripken/sql.js#read-a-database-from-the-disk
  • https://github.com/kripken/sql.js#write-a-database-to-the-disk

(with some adaptations)

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