After executing window.open(), the ListBox becomes inaccessible

Within the Page_Load() function, I am adding the following JavaScript:

var scriptReihe = "<script type=\"text/javascript\">function OnClientLoadHandlerReihe(sender) {"
                     + "var listbox = $find(\"" + lbReihen.ClientID + "\");"
                     + "var item = listbox.get_selectedItem();"
                     + "item.ensureVisible();"
                     + "}"
                     + "</script>";

Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "OnClientLoadHandlerReihe", scriptReihe);
lbReihen.OnClientLoad = "OnClientLoadHandlerReihe";

The variable lbReihen represents a control of type RadListBox.

This script works perfectly as intended, ensuring that the selected item in the ListBox is visible.

In addition to the ListBox, there is also a button on the page:

<asp:Button ID="myBtn" runat="server" Text="Call google" OnClientClick="window.open('http://www.google.ch', '_blank');" />

However, an issue arises when this button is clicked and a new tab containing Google is opened. After this action, the ListBox becomes unresponsive, making it impossible to scroll or interact with it.

If I remove the EventHandler registration for OnClientLoad, everything functions correctly again.

Could someone offer some guidance on what might be causing this issue? Any help would be appreciated - thank you.

javascriptasp.netteleriktelerik-ajaxtelerik-radlistbox

Answer №1

It's important to ensure that you register the script with each postback to avoid script errors when using a button declaration that triggers a postback on your main page. If the script is not registered correctly, you may encounter issues with scrolling to specific items. One way to address this is by including the script block in the markup and using server code blocks to access the listbox ID:


        <telerik:RadListBox ID="lbItems" runat="server"></telerik:RadListBox>
        <telerik:RadCodeBlock runat="server" ID="RadCodeBlock2">
            <script type="text/javascript">
                function OnClientLoadHandlerItem(sender) {
                    var listBox = $find("<%=lbItems.ClientID%>");
                    var selectedItem = listBox.get_selectedItem();
                    selectedItem.ensureVisible();
                }
            </script>
        </telerik:RadCodeBlock>

In addition, consider preventing the button postback by using "return false" in the OnClientClick event:

<asp:Button ID="myButton" runat="server" Text="Open website" OnClientClick="window.open('http://www.example.com', '_blank'); return false;" />

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