How the clearable function of the cascading selector in element ui adds a trigger event to it

when using elenemtui"s cascading selector, it seems that using clearable can only achieve formal emptying implementation, so I would like to ask whether events can be added to it and how to add

Mar.04,2021

should be able to judge in the event change

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1eaaf7d-201b.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1eaaf7d-201b.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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