How to realize form single selection and multiple selection deletion by Angular6

background api is deleted through id, but it is stuck here. I don"t know how to judge whether it is selected or not.
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Angular6 node.js typescript
Dec.22,2021

check a field of control binding data such as selected , and control binding such as [(ngModel)] = "xxx.selected"

filter the selected id array before deleting 

xxxList.filter((item) => item.selected == true).map((item) => item.id)

Previous: Mini Program's acquisition of formId,submit event is interrupted by binding event

Next: Input type= "file" needs to be checked on the interface before the file is uploaded, and the file box can be opened only when the check is passed, otherwise a prompt is given.

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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-64f5-1b2b082-2b2b5.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b2b082-2b2b5.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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