$(document).on('click', '.requerir', function () {
    var variavel1 = 'variavel1';
    var variavel2 = 'variavel2';
    //AQUI PREENCHE A TELA COM UM LOAD
    $('.full-loader').html('<img src="loader.gif"/>').show();
    $.ajax({
         type: "POST",
         url: "requerido.php",
         data: {variavel1:variavel1,variavel2:variavel2},
         success: function (data)
         {
             $('.page-content-inner').html(data);
             //AQUI REMOVE O LOAD DA TELA
             $('.full-loader').html('<img src="loader.gif"/>').show();
         }
    });
});