asp.net mvc - How to create a dynamic dropdown in mvc -


how create dropdown option values coming controller. controller getting database table's column value.

for example if dropdown selecting country, , have 3 country in database table's country column, in dropdown should show 3 country. , if add 1 more value in country table, should come in dropdown.

i new mvc found bit difficult. using mvc5.

nb: since 1 model refered inside view, cant add model dropdown

i have done same in own website. how it:

firstly, create action controller returns json value:

public actionresult getcountrynames()     {         list<string> countrynames = new list<string>();         countrynames = context.getcountries(); // ef context countrynames database         return json(countrynames.toarray());     }

then in view add html mark up:

<select id="countrylist" onchange="dosomething();"></select>

this dropdownlist. has javascript function declared in "onchange" event, if want when value changes.

lastly, need add javascript function, ajax call controller action, gets values , set dropdownlist:

function getcountrylist() { var serviceurl = '/home/getcountrynames';  $.ajax({     type: "post",     datatype: "json",     url: serviceurl,     success: successfunc,     async: false,     error: errorfunc });  function successfunc(data, status) {     var countrylist = $('#countrylist');     countrylist.empty();     (var = 0; < data.length; i++) {     var $option = $("<option>", { id: "option" + });     $option.append(data[i]);     countrylist.append($option);     } }  function errorfunc(data, status) {     alert('error');     } }

and when document ready, run function getcountrylist(). easiest jquery. this:

   <script type="text/javascript">        $(document).ready(function () {        getcountrylist();        });    </script>

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