TypeError: $w(...).expand is not a function??

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@guintoallona
Because you are using the dataset, i would suggest you to connect it also to your dropdowns and to your repeater, than you will need just the following code…

import wixData from 'wix-data';

$w.onReady(function () {
    $w('#clear').onClick(() => {
        $w("#dropdown1").value = undefined 
        $w("#dropdown2").value = undefined
        $w("#dropdown3").value = undefined
        $w("#buildingdataset").setFilter(wixData.filter()) 
    });

    $w('#search').onClick(() => {
        $w("#buildingdataset").setFilter(wixData.filter()
        .contains("firstName", $w("#dropdown1").value)
        .contains("lastName", $w("#dropdown2").value)
        .contains("nationality", $w("#dropdown3").value))
        .catch((err) => {console.log(err);});
        $w("#repeater").expand();
    });
});

Take a quick look onto this example here…
https://mt2-king.wixsite.com/filter-tool/csv-test
The shown code is working on this site.