How do I monitor mouse click events for select in elementUI?

for example, how to monitor the mouse click event of select in elementUI. A change event is triggered when the selected value changes, but I want to listen to it before the change occurs after the click. Thank you ~

Jul.13,2021

visible-change drop-down box is triggered when it appears / hidden; if it is true, hidden, it is false

When

is false, it is after clicking

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-64f5-1b38509-2c10b.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b38509-2c10b.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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