How to make one dropdown menu dependent on another

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I have a dropdown menu showing states and counties. I want the county one to be dependent on the state one. I am using react, javascript, prisma to access the database. I made it work separated, so I can get the states to show and the counties, but I don't know how to make them dependent. What I think I need is a way to change my function that bring the county data. I can group by the state that was selected. So what I need is after getting the state that was selected to send that to my "byCounty" function. Is that possible?

menu.js

export default function DropDownMenu(props){
    if(!props.states) return
    return(
        <table>
            <body>
            <select onChange={(e) => { console.log(e.target.value) }}>
                {props.states.map(states=>
                    <option>{states.state}</option>
                )}
            </select>
            <select >
                {props.byCounty.map(byCounty=>
                    <option>{byCounty.county}</option>
                )}
            </select>
            </body>
        </table>
    )
}

functions.js

const states = await prisma.county.groupBy({
        by:["state"],
        where: {
            date: dateTime,
        },
        _sum:{
            cases:true,
        },
    });

 const byCounty = await prisma.county.groupBy({
        by:["county"],
        where: {
            date: dateTime,
            state: 'THIS SHOULD BE THE STATE NAME SELECTED BY USER'
        },
        _sum:{
            cases:true,
        },
    });

const result =JSON.stringify(
        {states:states, byCounty:byCounty},
        (key, value) => (typeof value === 'bigint' ? parseInt(value) : value) // return everything else unchanged
      )
    res.json(result);

index.js

<div className={styles.table_container}>
                    <h2>Teste</h2>
                    <DropDownMenu states={myData?myData.states:[]} byCounty={myData?myData.byCounty:[]}></DropDownMenu>
              </div>

What I have:

enter image description here



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