title: cascading dropdown filters with ng-table
body: <p>I'm trying to get filter support on <a href="http://bazalt-cms.com/ng-table/" rel="nofollow">ngTable</a> with two external cascading dropdowns. as the documentation shows i have updated filterOptions but seems no luck. please help me   </p>
  
  <pre><code>$scope.tblInventory = new ngTableParams({
      page: 1,
      count: 10,
      filter: $scope.searchObjs,
  }, {
      total: 0,
      getData: function ($defer, params) {
          inventoryService.getAllVehicles().then(function (data) {
              params.total(data.length);
              $defer.resolve(data.slice((params.page() - 1) * params.count(), params.page() * params.count()));
          });
      }
  });
  </code></pre>
  
  <p>my Html mark up</p>
  
  <pre><code>&lt;select class="form-control" id="make" name="make" data-ng-model="searchObj.make"
          data-ng-disabled="!searchObj.makes"
          ng-options="make for make in makes"&gt;
      &lt;option style="display:none" value=""&gt;Select a make&lt;/option&gt;
  &lt;/select&gt;
  &lt;label&gt;
      Model
  &lt;/label&gt;
  &lt;select class="form-control" id="model" name="model" data-ng-model="searchObj.model"
          data-ng-disabled="!searchObj.models"
          ng-options="model for model in models"&gt;
      &lt;option style="display:none" value=""&gt;Select a model&lt;/option&gt;
  &lt;/select&gt;
  
  
  &lt;table ng-table="tblInventory" class="table"&gt;
      &lt;tr ng-repeat="item in $data"&gt;
          &lt;td data-title="'Stock'"&gt;
              {{item.stockNumber}}
          &lt;/td&gt;
          &lt;td data-title="'Make'"&gt;
              {{item.make}}
          &lt;/td&gt;
          &lt;td data-title="'Model'"&gt;
              {{item.model}}
          &lt;/td&gt;
      &lt;/tr&gt;
  &lt;/table&gt;
  </code></pre>