Convert ul li on dropdown

function.js

function listToDropdown(selector) {
    var $list   = $(selector),
        $select = $('<select class="btn btn-outline btn-white select-field-menup" />');

    // blank
    $select.append($('<option />').attr('value', '').html('Navegação'));

    // for each list change to a option in select field
    $list.children('li').each(function(index, el) {

        // extract url from link
        urlLink = $(this).children('a').attr('href');

        // extra text link
        textLink = $(this).children('a').text();

        $select.append($('<option />').attr('value', urlLink).html(textLink));
    });

    $list.replaceWith($select);
}

$('.select-field-menup').change(function(event) {
    var url = $(this).val(); // get selected value
    if (url) { // require a URL
      window.location = url; // redirect
    }
    return false;
});