搜索或刷新laravel中的页面后，将保留每个页面中的下拉值

public function index()
{
    $dropdownOptions = ['Option 1', 'Option 2', 'Option 3'];
    
    return view('page')->with('dropdownOptions', $dropdownOptions);
}

<select name="dropdown">
    @foreach($dropdownOptions as $option)
        <option value="{{ $option }}" {{ old('dropdown') == $option ? 'selected' : '' }}>{{ $option }}</option>
    @endforeach
</select>

public function submit(Request $request)
{
    $selectedOption = $request->input('dropdown');
    
    // 存储选中的下拉值到Session中
    session(['selectedOption' => $selectedOption]);
    
    // 其他处理逻辑
    ...
}

public function index()
{
    $dropdownOptions = ['Option 1', 'Option 2', 'Option 3'];
    $selectedOption = session('selectedOption');
    
    return view('page')->with('dropdownOptions', $dropdownOptions)->with('selectedOption', $selectedOption);
}

<select name="dropdown">
    @foreach($dropdownOptions as $option)
        <option value="{{ $option }}" {{ $selectedOption == $option ? 'selected' : '' }}>{{ $option }}</option>
    @endforeach
</select>