Is there a way to trigger a JavaScript function only when the update panel has completely loaded, rather than on the initial page load? I want to be able to scroll once the update panel is fully loaded.
If anyone has any suggestions or solutions, please let me know. Thank you!
Here is the method to retrieve the final Event following an update.
<script type="text/javascript">
var manager = Sys.WebForms.PageRequestManager.getInstance();
manager.add_endRequest(FinalizeRequest);
function FinalizeRequest(sender, args) {
}
</script>
Not yet tested
<script type="text/javascript>
var application = Sys.Application;
application.add_init(ApplicationInitialization);
function ApplicationInitialization(sender) {
var manager = Sys.WebForms.PageRequestManager.getInstance();
if (!manager.get_isInAsyncPostBack()) {
manager.add_pageLoaded(PageLoad);
}
}
function PageLoad(sender, arguments) {
//Do something
}
</script>
If you're utilizing AJAX, one method I have discovered to alert a user upon returning from an asynchronous post back event is by adding an "end request" handler to the PageRequestManager.
This allows you to specify a JavaScript function to run when coming back from an AJAX asynchronous post back event.
To implement this, use the following code:
function load()
{
Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);
}
Where "EndRequestHandler" should be the name of your desired JavaScript function to call. Invoke the above function in the Onload event of the <body> tag:
<body onload="load()">
function EndRequestHandler()
{
alert("Your record has been successfully saved");
}
If you want to display a different message based on server-side logic (code-behind), you can utilize a hidden field:
<input id="hdnValue" type="hidden" runat="server" value="" />
Set the value of this hidden field in server-side code during an asynchronous post back:
Protected Sub btn_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnCreateSample.Click
If condition Then
hdnValue.value = "do this"
Else
hdnValue.value = "do that"
End If
End Sub
You can then check the value of the hidden field in your client-side EndRequestHandler function and display a different alert based on its value:
function EndRequestHandler()
{
if (document.getElementById('<%= hdnValue.ClientID %>').value == "do this")
{
alert("Your record has been successfully saved");
}
else
{
alert("There is an error");
}
}
Here is a code snippet that utilizes jQuery to display a saved message and then hide it after 5 seconds once the update panel has been updated:
$(document).ready(function() {
function pageLoad() {
window.Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);
}
function EndRequestHandler() {
window.setTimeout(function() {
var label = $('#lblMsg');
if (label != null) {
label.hide();
}
}, 5000);
}
});
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