Upayavira commented on SOLR-12196:

I don't have a major investment in Solr at this time, but I am certainly game 
to follow on and add what bits I might. Whilst I am far from a front-end 
developer, I have recently played with Webpack and React with some success. The 
transition from the old JS UI to Angular was made simpler because of how 
Angular manages its (whole page) templates. React breaks things down into 
smaller components, and whilst this could be better in the long run in terms of 
component reuse, it means that a conversion could be a substantial piece of 
work. I like your idea of breaking the task down into smaller steps.

> Prepare Admin UI for migrating to Angular.io
> --------------------------------------------
>                 Key: SOLR-12196
>                 URL: https://issues.apache.org/jira/browse/SOLR-12196
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: Admin UI
>            Reporter: Jan H√łydahl
>            Priority: Major
>              Labels: Angular, AngularJS, angular-migration
>             Fix For: master (8.0)
> AngularJS is soon end of life, it [enters LTS in july 
> 2018|https://docs.angularjs.org/misc/version-support-status], whereupon it 
> will only receive fixes to serious bugs. Solr uses AngularJS 1.3 (the latest 
> AngularJS will be 1.7).
> This issue is *not* for upgrading to Angular5/6, but to start preparing the 
> existing UI for easier migration later on. See 
> [https://angular.io/guide/upgrade].
> This JIRA will likely get multiple sub tasks such as
>  * Change to [Folders-by-Feature 
> Structure|https://angular.io/guide/upgrade#follow-the-angularjs-style-guide], 
> i.e. mix html, css, js in a folder based on feature
>  * Use a [Module 
> Loader|https://angular.io/guide/upgrade#using-a-module-loader] like 
> [Webpack|https://webpack.js.org/]
>  * Use [Component 
> Directives|https://angular.io/guide/upgrade#using-component-directives] 
> (requires first move from AngularJS 1.3 to 1.5)
> The rationale for this lira is recognising how central the Admin UI is to 
> Solr, not letting it rot on top of a dying framework. Better to start moving 
> step by step and [perhaps write all new views in Angular 
> 5|https://angular.io/guide/upgrade#upgrading-with-ngupgrade], than to fall 
> further and further behind.
> This effort of course assumes that Angular.io is the path we want to go, and 
> not React, VueJS or some other new kid on the block :)

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