javascript - Dropdown list in KnockoutJS not binding -


i'm trying make values database appear in dropdownlist . sucessfully displayed data using table when added dropdownlist (<select>) stops there. can't figure out problem.

<table>   <thead><tr>     <th>choice text</th>     <th>zero tolerance message</th>     <th>has subchoice</th>   </tr></thead>   <tbody data-bind="foreach: choice">     <tr>      <td>          <label data-bind="text: choicetext,visible:isused"></label>          <input type="text" data-bind="value: choicetext, visible: !isused()" >      </td>      <td>          <label data-bind="text: zerotolerancemessage, visible: isused"></label>          <input type="text" data-bind="value: zerotolerancemessage, visible: !isused()" />      </td>      <td>          <label data-bind="text: hassubchoice, visible: isused"></label>          <input type="text" data-bind="value: zerotolerancemessage, visible: !isused()" />          <select data-bind="options: controltype, optionstext: 'controltype', optionscaption: 'ct', optionsvalue: 'controltypeid'"/>      </td>     </tr>   </tbody> </table>

below these scripts:

<script src="~/content/scripts/jquery-1.9.1.js"></script> <script src="~/content/scripts/jquery-1.9.1.min.js"></script> <script src="~/content/scripts/knockout.js"></script> <script src="~/content/scripts/knockout.mapping-latest.js"></script> <script type="text/javascript">     $(document).ready(function () {          $(function () {              $('th > :checkbox').click(function () {                 $(this).closest('table')                     .find('td > :checkbox')                     .attr('checked', $(this).is(' :checked'));             });         });          var viewmodelchoicejson = ko.mapping.fromjs( $.parsejson('@html.raw(model.choicejsondata)'));         var viewmodelcontroltypejson = ko.mapping.fromjs( $.parsejson('@html.raw(model.controltypejsondata)'));         //html.raw(jsondata)         ko.applybindings({ choice: viewmodelchoicejson });         ko.applybindings({ controltype: viewmodelcontroltypejson });     });  </script>

controller:

public actionresult choicelist(int? questionid) {     _validationservice = difactory.resolve<ivalidationservice>();     _choiceservice = difactory.resolve<ichoiceservice>();     choiceviewmodel viewmodel = new choiceviewmodel(_choiceservice.getchoice(questionid));     viewmodel.choicejsondata = jsonconvert.serializeobject( _choiceservice.getchoice(questionid));     viewmodel.controltypejsondata = jsonconvert.serializeobject(_validationservice.getcontroltype());     //  viewmodel.controltypesource = utility.controltypesource();     return partialview("~/areas/validation/views/choice/choicegrid.cshtml", viewmodel); }

don't apply bindings twice same context. change javascript to:

ko.applybindings({     choice: viewmodelchoicejson,     controltype: viewmodelcontroltypejson });

and in html, binding options specify $root before controltype:

<select data-bind="options: $root.controltype, optionstext: 'controltype', optionscaption: 'ct', optionsvalue: 'controltypeid'"/>

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