How does angular monitor data changes dynamically?

angular rookie, do not spray
1. I want to monitor the real-time changes of data in the textarea box
2, how to bind the current data length in real time

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ts

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Angularjs typescript-ionic2
Mar.21,2021
The span in the

template does not need to write [(ngModel)], just write {{textContent.length}}.

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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-64f5-1e3e783-447c7.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e3e783-447c7.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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