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Date: Thu, 12 Feb 2015 14:05:42 -0700
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Subject: Re: Maintaining App Data When Switching WebViews
From: Josh Bavari <jbavari@gmail.com>
To: dev@cordova.apache.org
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Andrew,

Here at Ionic, we've had a few users request something like this. My
approach has been to create a Cordova plugin, that takes the following
steps:

Creates an instance of the original webview
Executes some JS inside the webview that will grab all entries for
localstorage
If Android pre KIT_KAT or more, executed JS calls a JSInterface to pass the
data back to native land
If KIT_KAT or greater, calls evaluateJavascript
Those values are read, and passed back to the original webview
>From there, it'd go through the keys, and add them into the new webview

See this repo for my work in progress:
https://github.com/driftyco/cordova-plugin-local-storage-retrieval

On Thu, Feb 12, 2015 at 1:46 PM, Andrew Grieve <agrieve@chromium.org> wrote:

> Worth a discussion about this, I think.
>
> If you have an app already launched that uses localstorage/websql, and want
> to switch to xwalk, how can you migrate your data?
>
> What if you want to use system webview for API >= 21 and xwalk only for old
> phones? Then you need to move data in the reverse direction.
>
>
> Idea 1:
> - See if sqlite / localstorage databases are the same format, and provide
> code that migrates db locations
>
> Idea 2:
> - Use wizcorp's multi-window plugin to create a new an off-screen system
> webview, then use post-message to read data out of the old one.
>
> WDYT? Is this a problem we need to solve?
>


-- 
"Clear thoughts produce clear results."
Josh Bavari
Application Developer
Phone: 405-509-9448
Cell: 405-812-0496
Email: jbavari@gmail.com

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