How can I tell that WebView has slipped to the top in React Native?

such as the title.
or is there a way to get the content height of WebView?

Mar.14,2021

can be implemented with webview's injectJavaScript and onMessage

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-64f5-1b2c64b-2b058.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b2c64b-2b058.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?