[wp-trac] [WordPress Trac] #45053: Customizer throws JS errors when page contains <area> tag without href attribute

WordPress Trac noreply at wordpress.org
Fri Oct 5 08:41:48 UTC 2018

#45053: Customizer throws JS errors when page contains <area> tag  without href
 Reporter:  janthiel      |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Customize     |    Version:  4.9.8
 Severity:  normal        |   Keywords:  has-patch
  Focuses:  javascript    |
 Using the customizer on a page that contains <area> Tags without href
 attributes leads to JS errors. api.prepareLinkPreview expects the parsed
 elements to have a href attribute.

 <area> tags can contain them, but do not have to (
 element ). <area> Tags are used in Google Maps with Markers for example
 (e.g. in Enfolds implementation).

 This is the JS error thrown:

 customize-preview.min.js?ver=4.9.8:formatted:131 Uncaught TypeError:
 Cannot read property 'substr' of undefined
     at Function.d.prepareLinkPreview (customize-
     at HTMLAreaElement.<anonymous> (customize-
     at Function.each (jquery.js?ver=1.12.4:2)
     at n.fn.init.each (jquery.js?ver=1.12.4:2)
     at customize-preview.min.js?ver=4.9.8:formatted:101
     at Function.m.each.m.forEach (underscore.min.js?ver=1.8.3:5)
     at MutationObserver.<anonymous> (customize-

 The attached patch simply narrows the selector to only target <area> tags
 WITH href attributes in handleUpdatedChangesetUuid. Other area Tags are no
 Links and thus not a target for the prepareLinkPrevie Method.

Ticket URL: <https://core.trac.wordpress.org/ticket/45053>
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