title: jQuery UI autocomplete: enforce selection from list without modifications
body: <p>I am using the custom binding provided in <a href="https://stackoverflow.com/questions/7537002/autocomplete-combobox-with-knockout-js-template-jquery/" title="Autocomplete combobox with Knockout JS template / JQuery">Autocomplete combobox with Knockout JS template / JQuery</a></p>
  
  <p>I need to enforce that the user must select a value in the autocomplete list and after they select the value to not be able to add additional text to the select. I have searched but I cannot find an example of how to prevent additional text from being entered. It must stay editable incase they selected the wrong drop down but what they type must match 100% with a value from the list. </p>
  
  <p>I found <a href="http://forum.jquery.com/topic/autocomplete-force-selection" rel="nofollow noreferrer" title="this">this</a> posting on jquery but its 9 months old and no one posted an answer.</p>