Repeating UpdatePanels
In some scenarios—for example, if you want to show the details of a
repeated data structure on demand—it may be tempting to put an UpdatePanel
control inside a repeated structure
such as a DataList
or a Repeater
control, which, let's face it, is not a
very good idea in most cases.
Sometimes, it's just better to place one big UpdatePanel
around the repeated structure and
update the whole thing on postbacks. Another option is the one shown in
the last example of the previous section, in which a unique external
UpdatePanel
can associate dynamically
with any item in the repeated structure (the DataList
in the example). This works and scales
well if you want only one details view to be visible at any given
time.
However, it is possible to dynamically create UpdatePanel
controls. This opens the possibility
of an UpdatePanel
control inside of the
template of a Repeater or DataList
(as
well as a few other scenarios like UpdatePanel
controls in WebParts). In Example 10, the template of a DataList
control contains a conditionally
updating UpdatePanel
control. The
template of the UpdatePanel
control
itself contains a label and a button. The click event handler for the
button modifies the text of the label and the button.
Example 10. Repeating an UpdatePanel control.
<%@ Page Language="C#" %> <%@ Import Namespace="System.Drawing" %> <%@ Import Namespace="System.ComponentModel" %> <script runat="server"> protected void ButtonClick(object sender, EventArgs args) { Button btn ...
Get ASP.NET AJAX UpdatePanel Control now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.