ASP.NET TreeView - Select multiple nodes

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Select multiple nodes with CTRL+Click or SHIFT+Click

oTree.MultiSelectEnable = true

Selected IDs:


How to select multiple nodes?

One line of code can do it
oTree.MultiSelectEnable = true



How do I get an array with all the elements selected?

Variable ob_sn2 has selected node IDs separated by "|" symbol.
You can send data to server, process data on server without reloading page using AJAX Page.

ob_sn2.split('|') returns an array with the ids of the selected elements.




How do I get the selected ids at server side?

Add to your page a hidden element:
<input type='hidden' name='ob_selected_ids' id='ob_selected_ids' value=''>
And on the button that submits the page add:
onClick='document.getElementById("ob_selected_ids").value = ob_sn2; return true;'
Now on the server side, simply read the value from the field ob_selected_ids
and split it using | as separator

You can also use our free AJAX Page ASP.NET control
It can send data to server, process data on server and send result back without reloading page.



How do I select nodes using SHIFT+Click?

To enable this feature you have to do the following:
- Download Download the new ob_multiselect function and replace the old one
located in the ob_mdn_xxxx.js file (from the tree2/script folder)
- Add a new variable at the top of the ob_mdn_xxxx.js file:
var o_l2;
- Download Download the new ob_t2_UnselectAllNodes function and add it at the end
of the ob_tree_xxxx.js file




How to select several nodes on server side?

oTree.MultiSelectEnable = true;
oTree.SelectedId = "node1,node2,node3,node4";


List node IDs with a comma (",") and without spaces.



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