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ERROR Synchronous XMLHttpRequest on the main thread is deprecated

Jian-cdoApr 12 2018 — edited Apr 17 2018

Hello,

I got this deprecated warning message on some Dynamic Actions of select lists.  Basically, the DA either does something like:

:P7_SELECTED_STUDY:=:P1_STUDY_LIST;

or:  refresh the region that brings back a tabular form by sql query.

The complete message is:

jquery-2.1.3.min.js?v=5.0.3.00.03:4 [Deprecation] Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help, check https://xhr.spec.whatwg.org/.

I wonder how to track down the root cause of this message (similar DA doesn't trigger the same message on other pages)?  Our current APEX version is 5.0.3, will it matter when we upgrade to 5.1?  Thanks.

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Locked on May 15 2018
Added on Apr 12 2018
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