javascript - ComboBox to select only data in the list but submit their 3 digit code HTML5 -

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i want add input box in form users can select airport similar 1 in website (http://www.wego.pk/) when type on destination input, list of possible values detailed suggestion including city name + country name when user submits form value submitted 3 digit code airport.

i tried html5 combobox as:

<form>     <input type="text" name="product" list="productname"/>     <datalist id="productname">         <option value="isb">pen</option>         <option value="khi">pencil</option>         <option value="pwh">paper</option>     </datalist>     <input type="submit"> </form>

but if type pen no suggestion comes. kindly share code snippet or library purpose.

i recommend use autocomplete plugin (e.g. jquery ui autocomplete) instead html5 datalist. however, if question regarding datalist, can populate product code hidden field: 

<form>     <input type="hidden" name="productcode" id="productcode" value="">     <input type="text" name="product" id="product" list="productname" autocomplete="off">     <datalist id="productname">         <option data-code="isb">pen</option>         <option data-code="khi">pencil</option>         <option data-code="pwh">paper</option>     </datalist>     <input type="submit"> </form>  <script src="https://code.jquery.com/jquery-1.12.4.min.js" integrity="sha256-zosebrlbnqzlpnkikedrpv7loy9c27hhq+xp8a4mxaq=" crossorigin="anonymous"></script> <script> $(function() {     // use "bind" instead "on" jquery lt 1.7     $("#product").on("input", function(e) {         var val = $(this).val();         var listid = $(this).attr("list");         var $option = $("#" + listid + " option").filter(function() {             return ($(this).val() == val);         });         var code = ($.type($option.data("code")) != "undefined" ? $option.data("code") : "");         $("#productcode").val(code);     }); }); </script>

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