Let the user vote from a dropdown menu. ID not found

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The idea: If the button is clicked i want to find the row fitting the input from a dropdown menu and increase this items “number” by 1.

What I basically wanna do is, let the user vote for an item from a dropdown menu and increase its vote count.

Unfortunatly i didnt find a way to get an items index found by a query so its all a bit improvised and now im lost. Also please ignore all the seemingly unefficient way of variable declarations…i tried to narrow down the error:

import wixData from ‘wix-data’ ;
import {local} from ‘wix-storage’ ;

$w.onReady( function () {
local.setItem( “id” , 0 )
});

export function button50_click(event) {

let vote = $w( ‘#dropdown1’ ).value

wixData.query( ‘Leservorschlage2’ )
.eq( ‘title’ ,vote)
.find()
.then(res => {
let item = $w( “#dataset5” )
var ID = item.number //number is coloumn in database
local.setItem( “id” ,ID )

//console.log(“item.number=”,ID)

var id2 = local.getItem( “id” )
var id3 = id2.valueOf()

                $w( "#dataset5" ).setCurrentItemIndex(id3);

//console.log(“currentitem index =”,$w(“#dataset5”).getCurrentItemIndex())

let item2 = $w( “#dataset5” )
let val = item2.done + 1 ;
$w( “#dataset5” ).setFieldValue( “done” , val);
$w( “#dataset5” ).save();
})
. catch ((error) => {
console.log(error);
});

}

Any idea why its not working?
Apparently the number assigned to local variable “id” fails to be used as the Id for setCurrentItemIndex:

console.log:
item.number= undefined
currentitem index = 0

and even if I directly assign a value to “ID”, the console.log output for “currentitem index” remains 0.

Thanks a lot for your help. (What I simply wanna do is, let the user vote for an item from a dropdown menu and increase its vote count)