@jimyaccino
All your already displayed items, which have been already checked once, you will have to save their STATUS inside your DB → for example → using a BOOLEAN-DB-FIELD.
This way you can load checkboxes, knowing which ones already have been selected once, because the booleanfiled changed from false to → true.
When you load data to your REPEATER …
booleanField will be the field where you will set FALSE/TRUE-VALUES
$w('#myRepeaterID).onItemReady(($item, itemData, index)={console.log(itemData);
console.log(itemData.booleanField); //result --> status of every single loaded checkbox
});
I do not test what i am suggesting here, everything i do out of my mind, so you will have eventually to do some corrections.
To keep all this in an short conclusion: → You need something which works like MEMORY and knows exactly which checkbox already has been clicked once.
And your MEMORY is your DATABASE → Boolean-Field!