Passing Javascript data to Laravel Blade

I'm writing a feature to trigger the jQuery when the dropdown box change. I need to use the PHP Laravel function to access the DB and do the math.

$('.postage_trigger').change(function(){
    name = $(this)[0].name;
    the_id = name.split("_");
    weight = $('#weight_'+the_id[1])[0].value;

    {!!""; $province = new App\Province; !!}
    {!!""; $weight = "<script>document.write(weight)</script>"; !!}
    {!!""; $province_id = "<script>document.write(the_id)</script>"; !!}

    total = {!! $province->shippingCalculator($total_product_weight=$weight,$province_id=$province_id) !!};

    console.log(total);
    $('.shipping_amount').val($(this).attr('id'));
});

Referring to the answer from one of the stackoverflow post and trying to pass the data into PHP. and this is what i got from view source:

jQuery(document).ready(function(){
$(".shipping_amount").val(0.00);
var sum = 0.000;
// $('.postage_trigger :selected').each(function() {
    // sum += parseFloat($(this).val());
// });
// $("#shipping_amount").val(sum);

$('.postage_trigger').change(function(){
    name = $(this)[0].name;
    the_id = name.split("_");
    weight = $('#weight_'+the_id[1])[0].value;

    total = <script>document.write(weight)</script>;

    console.log(total);
    $('.shipping_amount').val($(this).attr('id'));
});

});

Can anyone please give me a guide to pass it correctly? Thanks

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