jquery - Data binding for multiple dropdownlists for default shown values -


i have 3 dropdownlists populated(cascading). country, city , factory. data binded correctly 3 dropdownlists.

the problem when select country, relevant cities binded correctly city ddl first value got selected city ddl(default shown value), factory ddl doesn't show relevant factories. if choose element city ddl , again if click on default shown element of city ddl works fine. here script

<script> //for ddls var citydropdown = $("#selectedcity");   $('#selectedcountry').change(function () {     $.ajax({         url: '@url.action("fillcity", "godown")',          type: "get",         datatype: "json",         data: { country: $(this).val() },          success: function (cities) {             citydropdown.empty();             $.each(cities, function (i, city) {                 citydropdown.append($('<option></option>').val(city.cityid).html(city.cityname));             });         }     }); })  var factorydropdown = $("#selectedfactory");          $('#selectedcity').change(function () {             $.ajax({                 url: '@url.action("fillfactory", "godown")',                  type: "get",                 datatype: "json",                 data: {city: $(this).val() },                  success: function (factories) {                   factorydropdown.empty();                     $.each(factories, function (i, factory) {                        factorydropdown.append($('<option></option>').val(factory.factoryid).html(factory.factoryname));                     });                 }             });         })     </script>

all appreciated. in advance!

you need trigger .change() event of cities dropdown list once populate cities, associated factories loaded

$('#selectedcountry').change(function () {   $.ajax({     ....     success: function (cities) {       citydropdown.empty();       $.each(cities, function (i, city) {         citydropdown.append($('<option></option>').val(city.cityid).html(city.cityname));       });       $('#selectedcity').trigger('change'); // add     }   }); })

however unnecessarily making ajax call server populate factories city user may not interested in. better add default "please select" option cities dropdownlist user can select city , populate associated factories.

$('#selectedcountry').change(function () {   $.ajax({     ....     success: function (cities) {       citydropdown.empty();       citydropdown.append($('<option></option>').val('').html('please select')); // add       $.each(cities, function (i, city) {         citydropdown.append($('<option></option>').val(city.cityid).html(city.cityname));       });     }   }); })

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