Question

When Delete button is clicked, the confirmation box should pop up if the selected node has child nodes. Otherwise, it should not do anything.

Right now, when I click on delete, it just deletes without confirming.

Here is the code:

  <asp:Button ID="btn_delete" runat="server" Height="32px" 
        onclick="btn_delete_Click"  OnClientClick = "return childnode();"                              
        Text="Delete" Visible="False"  />  

    <script type="text/javascript">
        function childnode() {
            var treeViewData = window["<%=nav_tree_items.ClientID%>" + "_Data"];

            var selectedNode = document.getElementById(treeViewData.selectedNodeID.value);
            if (selectedNode.childNodes.length > 0) {
                return confirm("heloo");
            }
            return false;
        }                                        
    </script>

Answer 1

You’ll need to return false from the function if you don’t want the button push to go through in some cases. Currently you are only returning a value from the function when calling confirm.

If one or both of the if conditions fail, add a return false if you don’t want the event to bubble up activating the button/sending the form.

---

Modification of your existing code

function childnode() {
    var treeViewData = window["<%=nav_tree_items.ClientID%>" + "_Data"];
    if (treeViewData.selectedNodeID.value != "") {
        var selectedNode = document.getElementById(treeViewData.selectedNodeID.value);
        if (selectedNode.childNodes.length > 0) {
            return confirm("heloo");
        }   

        return false; // don't send form                                             
    }

    return false; // don't send form
}  

---

Is it still malfunctioning?

1. Make sure that the logic inside your function is accurate, webbrowsers will often fail silently when trying to get a property of an undefined variable.

2. In your definition of your button you have written OnClientClick = "return childnode();", try changing this to OnClientClick="return childnode();" and see if that might solve the problem.

3. See if the event fires at all, OnClientClick="alert(123);".