Firefox for Android cannot get values from dropdown list

Developer-related question: I have a Javascript function written with Coldfusion that can retrieve values from dropdown lists. This works in both IE and Firefox for desktop/PC. However, no matter which value is selected in the dropdown list for Firefox for Android, the value is not updated. Sample code: (html file) <select name='type_desc_list' size='7' tabindex="-1" style='font-family:Arial;top:200;left:200;position:absolute;visibility:hidden;' onClick='selBoxKeyEvent(this, 13);' onKeyUp='selBoxKeyEvent(this, event.keyCode);' onFocus='selBoxOnFocusEvent(this);' onBlur='hideSelBox(this);'> <option value="Large">Large</option> <option value="Small">Small</option> </select> (js file) function selBoxKeyEvent(selBox, keyCode) { if (keyCode == 13) { if (getBrowser() == "IE") { var eventX = document.body.scrollLeft + event.x; var offsetScrollBar = 0; if (selBox.size < selBox.options.length) offsetScrollBar = 12; flgProcesssbox = 'n' if (navigator.userAgent.indexOf('Trident/6') != -1) { flgProcesssbox = 'y' } else { if (((eventX > selBox.offsetLeft) && (eventX < (selBox.offsetLeft + selBox.offsetWidth - offsetScrollBar))) || (eventX > selBox.offsetLeft + selBox.offsetWidth)) { flgProcesssbox = 'y' } } if (flgProcesssbox == 'y') { assignValue(selBox); if(nxt_TB != 'n'){goNextIndex(selBox);} hideSelBox(selBox); } } else { assignValue(selBox); if(nxt_TB != 'n'){goNextIndex(selBox);} hideSelBox(selBox); } } else if (keyCode == 27) { entryArray[0].focus(); } if (selopen== true) { selfocus= true; } }