Comparing the previously selected node with the currently selected node in an ASP.NET treeview

I am looking to implement a comparison between the last selected node and the currently selected node on a tree view using JavaScript.

Can anyone provide me with some code snippets to help me compare the previous selection with the current selection on the tree view?

If both node selections are the same, I would like to deselect the node.

Thank you in advance for your assistance.

I have successfully resolved this issue with the following server-side code:

 protected void TreeView1_PreRender(object sender, EventArgs e)
    {
        if (TreeView1.SelectedNode != null)
        {
            if (!string.IsNullOrEmpty(ADUtility.treenodevalue))
            {
                if (ADUtility.treenodevalue == TreeView1.SelectedNode.ValuePath)
                {
                    TreeView1.SelectedNode.Selected = false;

                }
                else
                {
                    ADUtility.treenodevalue = TreeView1.SelectedNode.ValuePath;
                }
            }
            else
            {
                ADUtility.treenodevalue = TreeView1.SelectedNode.ValuePath;
            }
        }
    }
c#javascriptasp.nettreeview

Answer №1

Providing a Pseudo code snippet for your reference, you can customize it as needed: Define two global variables, CurrentselectedNode and PreviousselectedNode, and create an ArrayList to store Nodes.

ArrayList<Object> nodeCollection;
var PreviousselectedNode;
var CurrentselectedNode;

if(nodeCollection.Current != null)
{
    PreviousselectedNode= nodeCollection.Current;
    var tempselectedItem = Products_Data.selectedNodeID.value;
    var CurrentselectedNode = Document.getElementById(tempselectedItem);

// Perform actions on the current and previous nodes as required

    nodeCollection.Add(tempselectedNode);
}
else
{
    var tempselectedItem = Products_Data.selectedNodeID.value;
    var tempselectedNode = Document.getElementById(tempselectedItem);
    nodeCollection.Add(tempselectedNode);
}

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