"All" Option in Dropdown does not work

Hello,
I’ve been trying for hours now to get the added “Alle” option in my dropdown to work - by resetting the filter, so all the entries are shown in my repeater like before the entire filtering process. Being a beginner, I’ve followed a lot of tutorials. However, even when looking at other posts, none of the solutions seem to work…
This is my current code, I wonder what exactly is wrong with it?

import wixData from “wix-data” ;

$w . onReady (() =>{
loadThema ();
});

let lastFilterTitle ;
let lastFilterThema ;
let debounceTimer ;
export function searchBar_keyPress ( event , $w ) {
if ( debounceTimer )
{
clearTimeout ( debounceTimer );
debounceTimer = undefined ;
}
debounceTimer = setTimeout (()=> {
filter ( $w ( ‘#searchBar’ ). value , lastFilterThema )
}, 200 );

}

function filter ( title , thema ) {

if ( lastFilterTitle  !==  title  ||  lastFilterThema  !==  thema ) 
{ 
    let  newFilter  =  wixData . filter (); 
    if ( title ) 
        newFilter  =  newFilter . contains ( 'title' ,  title ); 
    if ( thema ) 
        newFilter  =  newFilter . contains ( 'thema' ,  thema ); 
    $w ( '#dataset1' ). setFilter ( newFilter ); 
    lastFilterTitle  =  title ; 
    lastFilterThema  =  thema ; 
} 

}

/**

  • Adds an event handler that runs when an input element’s value
    is changed.
    Read more
  • @param {Event} event
    */
    export function themaDropdown_change ( event ) {
    // This function was added from the Properties & Events panel. To learn more, visit Velo: Working with the Properties & Events Panel | Help Center | Wix.com
    // Add your code for this event here:
    let filterType = $w ( ‘#themaDropdown’ ). value ;
    if ( filterType === “Alle” ){
    $w ( ‘#dataset1’ ). setFilter ( wixData . filter ());
    } else {
    filter ( lastFilterTitle , $w ( ‘#themaDropdown’ ). value );
    }
    }

function loadThema ( )
{
wixData . query ( ‘Thema’ )
. find ()
. then ( res =>{
let options = [{ “value” : ’ ’ , ‘label’ : ‘Alle’ }];
options . push (… res . items . map ( thema => {
return { “value” : thema . title , “label” : thema . title };
}));
$w ( ‘#themaDropdown’ ). options = options ;
});
}

Try this

export function themaDropdown_change ( event ) {
// This function was added from the Properties & Events panel. To learn more, visit Velo: Working with the Properties & Events Panel | Help Center | Wix.com
// Add your code for this event here:
let filterType = $w ( ‘#themaDropdown’ ). value ;
if ( filterType === “Alle” ){
$w ( ‘#dataset1’ ). setFilter (); // Nothing in the filter
} else {
filter ( lastFilterTitle , $w ( ‘#themaDropdown’ ). value );
}
}

I removed the wixData.filter from the dataset.filter
Found it here:

Hello Kristof,
it still doesn’t work with your code copied sadly… I really wonder what the issue is here