I am facing an issue with a simple form that includes a textbox and submit button wrapped in an update panel.
<asp:UpdatePanel ID="ReplyUpdatePanel" UpdateMode="Conditional" runat="server">
<ContentTemplate>
<asp:Textbox id="ReplyTextBox" runat="server"/>
<asp:Button id="SubmitButton" OnClick="SubmitButton_Click" runat="server"/>
<ContentTemplate>
</asp:UpdatePanel>
After clicking the button, the server-side click event (SubmitButton_Click) is triggered, data is processed in the database, and the page is re-rendered asynchronously.
The challenge arises when I need to execute JavaScript code after the database processing is complete.
I have attempted using:
Page.RegisterStartupScript
and also:
ScriptManager.RegisterStartupScript
However, neither of these methods seem to work as intended.
To solve this issue, I considered hooking into the .add_pageLoaded function in the client-side AJAX library to execute scripts once the partial update is finished. The problem is that I require data from the server based on the button click event.
For example:
Sys.Application.add_init(function () {
Sys.WebForms.PageRequestManager.getInstance().add_pageLoaded(function (sender, args) {
var panels = args.get_panelsUpdated();
for (var i = 0; i < panels.length; i++) {
// check panels[i].id and do something
}
});
});
The only workaround I can think of at the moment is to follow the above method but call a web service to retrieve all the necessary data before executing my script. This approach feels like a "hack," as it involves unnecessary asynchronous postbacks and multiple calls to the server.
Are there any more efficient solutions to this common problem? Please note that removing the UpdatePanel is not an option for me despite its limitations.
EDIT
To provide clarification on the data needed for the script:
When I enter text in the textbox and click submit, the server creates a database record and returns an object with properties such as ID, Name, URL, Blah, etc. These values are essential for the script to function correctly.
If I were to call a web service from the client-side code to fetch these values, I would have to resort to some workarounds (fetching the last modified record with the textbox value). This solution is not ideal, as it requires two AJAX calls for a single form submission (update panel postback followed by a web service call).