Filling fields on input

I am creating a search engine and i want to check the database and fill in the hidden fields in the form if the search field brings back a match in the database. So for example if the user entered London and it had a match in my city table, i would want the hidden id and country_id fields filled with the city id and its related country id so that on the search page i would get a url like. Can this be done?

'search?searchinput=London&City=1&Country=1

I have two tables both connected through the relationship:

City: id, name, country_id

Country: id, country,

HTML form:

<div class="search-homepage-input">
    {!! Form::open(['route' => 'search.index', 'method' => 'GET']) !!}
    <div class="col-md-9 col-l">
    {!! Form::text('searchinput', null, array('class' => 'form-control ', 'maxlength' =>'50', 'placeholder' => 'Search by city. Eg. London, New York, Milan...')) !!}
    </div>
    {!! Form::hidden('country', null, array('id' => 'country')) !!}
    {!! Form::hidden('city', null, array('id' => 'city')) !!}
    <div class="col-md-3 col-r">
        {!! Form::submit('Find Shops', array('class' => 'btn btn-homepage-search'))  !!}
    </div>
    {!! Form::close() !!}
</div>

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