Set Select Option Using Jquery -

i have 3 select boxes of country, state, city

<select name="property_country" id="country" >    <option value="">country</option> </select>  <select name="property_state" id="state" >    <option value="">state</option> </select>  <select name="property_city" id="city">    <option value="">city</option> </select> 

php filling country, ajax filling state , city fields, no problems there. have 2 countries in database - india , usa.

if select india, ajax gives state correctly. if reselect option label "country" state , city fields go blank. need jquery code fill default labels , values given above "state" , "city" if no country selected (meaning "country") selected.

this can done via database filling in state , city entries , attaching them country , onload (body or javascript) upload default values. make validation work patchwork , not logical flow. hence requirement of jquery solution.

my jquery code below:

$(document).ready(function() {   $('#country').on('change', function() {     var country_id = $('#country').val();     $.ajax({       type: 'post',       url: '../controllers/select.php',       data: "country_id=" + country_id,       success: function(msg) {         $("#state").html(msg);       }     });   });    $('#state').on('change', function() {     var state_id = $('#state').val();     $.ajax({       type: 'post',       url: '../controllers/select.php',       data: "state_id=" + state_id,       success: function(msg) {          $("#city").html(msg);       }     });   }); 

i tried

if (country_id == "") {     $("#state").val("state");                } else {         $.ajax({}); } 

you have again add blank option select field again if country value reset.

$('#country').on('change', function() { var country_id = $('#country').val(); if(country_id){   $.ajax({     type: 'post',     url: '../controllers/select.php',     data: "country_id=" + country_id,     success: function(msg) {       $("#state").html(msg);     }    });   }   else{     $("#state").html(' <option value="">state</option>');      $("#city").html(' <option value="">city</option>');    } });