title: How to get access all selected elements data value in JosephSKh's DropdownTree
body: <p>I want to access all data value of <a href="https://github.com/JosephSKh/DropdownTree" rel="nofollow noreferrer">JosephSKh's DropdownTree</a> like this</p>
  
  <pre><code>var arr4=[
              {title:"St Fatima",href:"#1",dataAttrs:[{title:"id",data:"value1"}]}
              ,
              {title:"Korba",href:"#2",dataAttrs:[{title:"id",data:"value4"}]}
              ,
              {title:"Roxi",href:"#3",dataAttrs:[{title:"id",data:"value7"}]}
          ];
  </code></pre>
  
  <p>From the above code, I want to access value1, value4, value7 if all are selected</p>
  
  <p>Can anyone help me?</p>