asp.net core passing jquery val as asp-route-id parameter

Question

I have the following jquery

 

$(function () {
    $("#Asset").on("change", function () {
        var categoryId = $(this).val();
        $("#Equipment").empty();
        $("#Equipment").append("<option value=''>--Select Equipment--</option>");
        $.getJSON(`?handler=Equipment&id=${categoryId}`, (data) => {
            $.each(data, function (i, item) {
                $("#Equipment").append(`<option value="${item.value}"> ${item.text}</option>`);
            });
            $('#Equipment').selectpicker({ liveSearch: true });
        });
        $.getJSON(`?handler=AssetDetails&id=${categoryId}`, (data) => {
            if (!jQuery.isEmptyObject(data)) {
                $("#AssetID").val(data.assetID);
                $("#AssetName").val(data.assetName);
                $("#AssetManufacturer").val(data.assetManufacturer);
            }
        });
    });
});

and a button

 

<button class="btn form-control" type="submit" asp-page-handler="Test" asp-route-id="id" id="testid">Button</button>

 

 Select

 

<div class="col-md-5">
            <select id="Asset" class="form-control" asp-items="@(new SelectList(string.Empty, "WOAId", "AssetID", "AssetName", "AssetManufacturer"))" data-style="border-warning bg-transparent">
                <option value="">--Select Asset--</option>
            </select>

        </div>

 

 

How do I pass $("#AssetID").val(data.assetID); as id in button asp-route-id?