javascript - How to get Select2 to update a ajax call when country value is changed -


i can't seem find easy example of how update states list when country list has changed. examples i've seen using sorts of bits , peices work depending on version , giving solution.

can me how can done without ugly hacks. i've tried far , whilst works, if change drop down second time, new values appended old ones instead of replacing them. i've tried destroying , rebuilding old values remain.

the data coming server valid json id , text values. far i've had no luck in getting state list update new country state values when country changed

   <select id="country" name="country" class="form-control" data-placeholder="select...">    <optgroup label="country">         <option></option>         <option value="us" > united states</option>         <option value="au" > austrailia</option>    </optgroup>    </select>      <select id="state" name="state" class="form-control" data-placeholder="select...">    <optgroup label="state">       <option></option>    </optgroup>    </select>            $("#country").select2().on("change", function(e) {         var country = e.val;          $.post("states", {           country_id: country         }, function(e) {           if (e)                $("#states").select2({                 data: e               });          })               });      $("#state").select2();

these values sent server

   [{ id: 'alb', text: 'alabama' }, { id: 'als', text: 'alaska' }, { id: 'ari', text: 'arizona' }]

you have remove <option> tags select before setting new data:

$.post("states", {     country_id: country   }, function(e) {      if (e){        $("#states option").remove();        $("#states").select2({            data: e         });      } })

you may want refine example avoid removing placeholders, if any.

see jsfiddle: https://jsfiddle.net/drj84go5/


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