jquery mobile - JQueryMobile - position and size of select menu -

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i working on jquerymobile page. page contain select element (dropdown) custom menu. trying position menu right below select button , change width width of select button. further stylizing follow well.

in firebug figured out jqm changes css classes of select menu (here: select-choice-1-listbox-popup) position attributes. thought might proper approach element , change top attribute. doesn't work though. guess code executed because first alert not show value "top" attribute.

<script type="text/javascript">     function positionmenu() {         alert(document.getelementbyid('select-choice-1-listbox-popup').style.top); // prints ""         document.getelementbyid('select-choice-1-listbox-popup').style.top="300px";         alert(document.getelementbyid('select-choice-1-listbox-popup').style.top); // prints "300px"     } </script>

[...]

<div onclick="positionmenu();"  data-role="fieldcontain" style="width:300px;">     <label for="select-choice-1" class="select">choose shipping method:</label>     <select data-native-menu=false name="select-choice-1" id="select-choice-1">         <option value="standard">standard: 7 day</option>         <option value="rush">rush: 3 days</option>         <option value="express">express: next day</option>         <option value="overnight">overnight</option>     </select> </div>

my question is: how can change attributes of select menu?


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