[wp-trac] [WordPress Trac] #27355: Customizer: Add framework for partial preview refreshes

[WordPress Trac]

#27355: Customizer: Add framework for partial preview refreshes
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 Reporter:  westonruter  |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  Appearance   |    Version:  3.4
 Severity:  normal       |   Keywords:
  Focuses:  javascript   |
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 In regards to the Widget Customizer merge in #27112, we agreed to remove
 the partial preview refreshing of widgets (live previews via postMessage
 transport and re-rendering widgets via Ajax then doing DOM replacements).
 This live preview functionality for widgets was removed in favor of
 generalizing the functionality so that any customize control can add
 support for doing so. This partial preview refresh is key to keeping
 things DRY by eliminating the current requirement that all setting updates
 via postMessage transport re-implement all rendering logic in JavaScript
 for components that are normally written out in PHP—but even when the
 render logic is attempted to be written in JS, it will never be able to
 account for any filters added in PHP.

 For instance, with such partial preview refreshes, the Navigation Menu
 control needn't do a full refresh of the preview: the menu's container
 could be targeted for a partial refresh, where the new menu gets rendered
 via an Ajax request and the response replaces the old menu.

 Originally mentioned at
 https://core.trac.wordpress.org/ticket/27112#comment:10

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Ticket URL: <https://core.trac.wordpress.org/ticket/27355>
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