dropdown - Not able to load JSON data into DropDownList in AngularJS -

i'm getting blank data while loading json data dropdown using angular ng-options.

my json values

"tagformat": {         "displaytext": "tag format",         "options": [{             "value": "js",             "name": "js"         }, {             "value": "vast",             "name": "vast"         }]     }, 

html view

<div class="select_padding">     <select class="form-control" ng-options="otf.value otf.name otf in details.tagformat.options">          <option>select tag format</option>     </select> </div> 

here details scope variable.

how these data , next time need use selected value. need bind ng-model ?

thanks

here working code:

    <select class="form-control" ng-options="item item.name item in details.tagformat.options track item.value" ng-model="selected">          <option value="">select tag format</option>     </select> 

in $scope.selected read selected item.

check example on codepen: http://codepen.io/beaver71/pen/vexwmr