php

               <form action="/" method="GET">
                    <input type="hidden" name="is_area" value="1" />
                    <select id="change_js" name="area_id" style="background: #0abab5;padding:10px;color:white;text-align:center;">
                        <option style="text-align:center;" value="">全国</option>
                        @foreach($prefecture_list as $prefecture)
                            <option value="{{ $prefecture->id }}" @if($area == $prefecture->id) selected @endif>{{$prefecture->prefecture_name}}</option>
                        @endforeach
                    </select>
                    <button id="btn-upload" type="submit" ></button>
                </form>

js

$(document).ready(function(){
    const selected = document.getElementById("change_js");
        selected.onchange = function() {
        document.getElementById('btn-upload').click();
    };
    let is_area = '{{ $area == "" ? "0" : "1" }}';
    if (is_area == '1'){
        document.getElementById("area_search").click();
    }

}