title: Bootstrap multi select : Flag to check all options are selected or not
body: <p>I am using  bootstrap multiselect plugin to enable the filtering of a select control and multiple selection .
  I have to load another dropdown based on the selected values and i used the </p>
  
  <blockquote>
    <p>onDropdownHide</p>
  </blockquote>
  
  <p>event for doing the same </p>
  
  <p>The code looks like this </p>
  
  <pre><code>$("#@param_name").multiselect({
      enableCaseInsensitiveFiltering: true,
      includeSelectAllOption: true,
      includeResetOption: true,
      includeResetDivider: true,
      resetText: "Reset all",
      selectAllValue: 'select-all-value',
      onDropdownHide: function (event) {                                              
          var allselected= ?????;   
          callTargetDropDownLoad(allselected);
      }
  });
  </code></pre>
  
  <p>And based on the allselected variable i have to write some custom logics. But i am not seeing any way to identify all values are selected or not in the dropdown and assign it to </p>
  
  <pre><code> allselected variable
  </code></pre>