how i automobile filter html selectlist?


i have html name list definitely few (1000+) names. i have javascript place name initial relating name someone starts typing. relating looks during start item: 



var optionslength = dropdownlist.options.length;
  (var n=0; n < optionslength; n++)
  {
    var optiontext = dropdownlist.options[n].text;
    (optiontext.indexof(dropdownlist.keypressbuffer,0) == 0)
    {
      dropdownlist.selectedindex = n;
      relapse false; 
    }
  }


the fan have advise autofilter: typing biased name should 'find' names containing part. i've seen few google advise options, many controlling ajax, nonetheless i'd pristine javascript option, given name list already hallowed anyway. pointers anyone?



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