How to select Dropdown option

I'm trying to select first <option> from dropdown using jQuery.
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In this case absolutely nothing changes:

$("#select_id input:radio:first").attr('checked', true);

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In this case, the classes "active" and "selected" were added and cleared at once.
And <option> wasn't selected.

$('div.item:nth-child(1)').addClass("active selected");

jQuery('dropdownselector').val(val).change();
jQuery('dropdownselector').closest('dropdown').dropdown('refresh');

I've used it already, but without success.
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I'll try to describe my situation:
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- I have a radios group and dropdown list (is hidden)

- default list is empty

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- when you select the radio button, show the dropdown list tablesize
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- in this code:
1) clear the dropdown list
2) append <option> from array
3) set value to dropdown
4) try to refresh dropdown

var table_size_article_1 = { "a_50×23": 374, "a_60×27": 527, "a_70×32": 728 };

$('input[name=tableview]').on("change", function() {

   $("#tablesize").empty();
 
   $.each(table_size_article_1, function(name, values){
      $('#tablesize').append($('<option>', {
         value: values,
         text: name
      }));
   });

   $("#tablesize").val(values).change();
   $("#tablesize").closest('dropdown').dropdown('refresh');
});

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In result, value was set to dropdown. But still no selected.
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If I comment //$ ("# tablesize"). Empty(); then the dropdown list will be selected after selecting the radios group twice (for example first radio button and second).

Here's what I noticed:
- the hidden <select> has an active <option>
- and <div> class "text" is empty
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Somebody know, how I can refresh data in <div class="text"> ?

Hi thebatik,
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Please check the Dynamic Loading section on page 37 of the CFv6 manual - I think that this will do what you need here.
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Bob

Hi Bob!
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Please see to my picture (sorry, but i'm not a designer)

I see that original <select> working correct after method "append" only and I needn't to "refresh" function.
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My js code contains in js file and checkbox "Add inside" is unchecked. Right?

Hi thebatik,
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It looks to me as if you have two drop-downs, one inside the other. Please check my last post for another way to do this.
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Bob