form wont export when search (search and export conflict)

I got one form with two submit button.

blade.php

    <form method="GET" id = "uploadForm">
        @csrf

        <div class="form-group">
            <button type="submit" value="Search" class="btn btn-info" id="search_btn" onclick="searchForm()">Search <i class="fa fa-search"></i></button> &nbsp;
            <button type="submit" value="Export" class="btn btn-success float-right" id="export_btn" onclick="exportForm()">Export <i class="fa fa-download"></i></button>
        </div>
    </form>

js file

function searchForm() get data and display as datatable
{
    let form = $('#uploadForm');
    let table = $('.datatable');

    form.attr('action', '/search').submit(function(e) {
        e.preventDefault();

        if ($.fn.DataTable.isDataTable(".datatable")) {
            table.DataTable().clear().destroy();
        }

        table.DataTable({
            processing: true,
            serverSide: true,
            bDestroy: true,
            bJQueryUI: true,
            ajax: {
                headers: {
                    'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')
                },
                url : form.attr('action'),
                type : form.attr('method'),
                data : {
                    type: $("#type").val(),
                    from: $("#from").val(),
                    to  : $("#to").val(),
                },
            },
            columnDefs: [
                {'data': 'trx_id',      "targets": 0, title: "Trx ID"},
                {'data': 'type',        "targets": 1, title: "Type"},
                {'data': 'sender_id',   "targets": 2, title: "Sender ID"},
                {'data': 'receiver_id', "targets": 3, title: "Receiver ID"},
                {'data': 'amount',      "targets": 4, title: "Amount"},
                {'data': 'remark',      "targets": 5, title: "Method"},
                {'data': 'fee',         "targets": 6, title: "Fees"},
                {'data': 'afterFee',    "targets": 7, title: "Amount After Fees"},
                {'data': 'date',        "targets": 8, title: "Date"},
            ],
            error(){
                alert("error");
            }
        });
        // prevent submit multiple time
        e.stopImmediatePropagation();
        return false;
        // prevent submit multiple time
    });
}

function exportForm() //export data and download excel 
{
    $('#uploadForm').attr('action', '/export');
    $('#uploadForm').attr('target', '_blank').submit();
}

Search_form and export_form both work fine. But it have problem when I call search_form then call export_form, it will always go into search_form and will not download excel. I have run out of idea how to solve this issues.