Filter(), FindIndex(), ... on Repeater

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I don’t know what you want to do, but you can easily access the children using the:

let $item = $w.at(event.context)

You just have to select one item inside the repeater the get the context and manipulate it, like this:

$w.onReady(() => {
    $w("#textRepeater").onClick((event, $item) => {
        $item = $w.at(event.context) //This creates the context (the item inside the repeater)
        $item("#textRepeater").text = "Clicked!" //This changes the text in the context
        console.log(event.context.itemId)
 })
})

And if you want to get the data of the item that was clicked, you just need to use:

let data = $w("#repeater").data
let clickedItem = data.find(item => item._id === event.context.itemId)