Display Tags based on Previous Selected Tags from a Data Collection.

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I don’t know what data you have in the repeater.
But let’s say you have 2 datasets on your page:

  1. userDynamicDataset (which represents the user selection data item)

  2. repeaterDataset (which represents the general selection tag items, where the title is the selection tag value)
    Then do something like:

let dataReadyStatus = 0;
$w.onReady(() => {
$w('#userDynamicDataset, #repeaterDataset').onReady(() => {
dataReadyStatus++;
if(dataReadyStatus > 1){
    $w('#repeaterDataset').setFilter(wixData.filter()
    .hasSome('title', .$w('#userDynamicDataset').getCurrentItem().tags)
    )
}
})
})