javascript - How to change drop-down value dynamically -


i need not in jquery. have bellow code , want changes.

if user select one/two(drop-down one) , hdb(drop-down second) want change boat quay, chinatown admiralty, alexandra road in third drop-down. 1 more thing want set one(drop-down one) default every time.

my code reference link: roblaplaca

i thankful if can me :) 

    <!doctype html> <html> <head> <title>custom styled selectbox</title> <link rel="stylesheet" href="http://www.roblaplaca.com/docs/custom-selectbox/css/customselectbox.css" /> </head> <body class="nojs"> <script type="text/javascript">  try{typekit.load();}catch(e){}     var bodytag = document.getelementsbytagname("body")[0];     bodytag.classname = bodytag.classname.replace("nojs", "hasjs"); </script> <div class="grid-system clearfix">   <div class="row">     <div class="col span-9">       <div class="example clearfix">         <select class="custom interactive" id="properties">           <option value="selectone">select type</option>           <option value="rfs">one</option>           <option value="rfr">two</option>           <option value="cfs">three</option>           <option value="cfr">four</option>         </select>          <select class="custom interactive" id="typelist">           <option>one</option>           <option>two</option>           <option>three</option>           <option>four</option>         </select>           <select class="custom">           <option value="">any</option>           <option value="">boat quay</option>           <option value="">chinatown</option>         </select>       </div>     </div>   </div> </div>  <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.0/jquery.min.js"></script>  <script src="http://github.com/vitch/jscrollpane/raw/master/script/jquery.jscrollpane.js"></script>  <script src="http://www.roblaplaca.com/docs/custom-selectbox/js/selectbox.js"></script>  <script type="text/javascript">  $(function() {     window.prettyprint && prettyprint()     /*         how initialization looks.          typically it's $("select.custom"), make example more clear          i'm breaking pattern , excluding interactive     */     $("select.custom").not(".interactive").each(function() {         var sb = new selectbox({             selectbox: $(this),             height: 150,             width: 200         });     });      /*         adding functionality "interactive" selects     */     var typelist = {         selectone: ["select type"],         rfs: ["any", "landed", "condominium", "hdb", "others"],         rfr: ["any", "landed", "condominium", "hdb", "others"],         cfs: ["any", "industrial", "retail", "land", "office", "others"],         cfr: ["any", "industrial", "retail", "land", "office", "others"]         }      var defaultselectboxsettings = {         height: 150,         width: 150     };      var country_sb = null,     city_sb = null;      $("select.interactive").each(function() {         if ($(this).attr("id") == "properties") {             country_sb = new selectbox($.extend(defaultselectboxsettings, {                 selectbox: $(this),                 changecallback: function(val) {                     if (typelist[val]) {                         city_sb.enable();                         updatecities(val);                     }                     if (val == "selectone") {                         city_sb.disable();                     }                 }             }));         } else if ($(this).attr("id") === "typelist") {             city_sb = new selectbox($.extend(defaultselectboxsettings, {                 selectbox: $(this)                 }));         }     });      updatecities($("#properties").val());      if ($("#properties").val() == "selectone") {        //city_sb.disable();     }      function updatecities(val) {         var $select = $("select#typelist"),         html = "";          (var = 0; < typelist[val].length; i++) {             html += '<option>' + typelist[val][i] + '</option>';         }         $select.html(html);          // hack: chrome fast?         settimeout(function() {             city_sb.sync();         }, 1);     }  });          </script> </body> </html>

here's code snippet can use add options:

var newoption = document.createelement("option"); newoption.value="newvalue"; newoption.innerhtml = "option text";  $("#properties").append(newoption);

to remove option use

$("#idoftheoption").remove();

just repeat objects want change.

since have arrays, do

$("#properties").html("");  for(var i=0; i<array.length;i++ ){    var newoption = document.createelement("option");    newoption.value=array[i];    newoption.innerhtml = array[i];     $("#properties").append(newoption); }

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