ajax.js

jQuery(document).ready(function ($) {
    // as nothing will be on the page we initialise with a call
    ajax_call();

    //  on click of the search button we make the call with the filter value
    $('#ajaxwfeasearch').click(function () {
        ajax_call();
    });


    function ajax_call() {
        $.ajax({
            url: test.ajax_url,
            type: 'post',
            data: {
                action: 'test_wfea',
                filter: $('#ajaxwfeafilter').val(),
            },
            success: function (response) {
                $('div#ajaxwfea').html(response);
            }
        });
    }

});