删除不要求确认

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);" .

Answer 2

Your function have return not in all of it's parts. Probably your function exists without confirm. Review your logic and decide what you want to do if one of your if statements not passed.

Answer 3

Change this:

onclick="btn_delete_Click"  OnClientClick = "return childnode();"

To this:

onclick="btn_delete_Click;return childnode();"