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Can't combine button-disable and code-behind function (JavaScript + code-behind)

When clicking on Insert-button, it does whatever it's suppose to do. But I don't want user to be able to click the button more than once and therefore I want to disable it once you press it.
<asp:Button ID="Insert" runat="server" Text="Send" OnClick="Insert_OnClick"
OnClientClick="this.disabled=true; showLoading(this);" />
When combining Insert_OnClick and "disable", the function Insert_OnClick wont run, because it somehow disable the button first and therefore the code-behind function wont run for that reason.
I also tried to disable to button itself in showLoading js-function, same behavior.
Any idea how to make the code-behind function run as the button get disabled?

You need to disable it in code behind. Even if you did disable it after the click, the changes made with javascript would still be undone after PostBack.
protected void Button1_Click(object sender, EventArgs e)
{
Insert.Enabled = false;
}
Or set a timeout on the OnClientClick? Maybe that will work.
OnClientClick="setTimeout(function () { this.disabled=true; }, 10);"

If possible, I would change the Submit behavior.
the problem with that approach is that the front end code takes place before the back end submit and if you disable the button before the back end submit then it won't be able to call the back end function.
Instead i would use different approaches, like consuming a webMethod or submiting the whole form .
with the web method you would be able to play a little bit with the front end while the back end finishes processing
With the whole submit you'll have to play with the page_load Event

Javascript function call in asp.net page

I have taken 1 textbox, 1 button and 1 alert image in my asp.net page. And I have written JavaScript function and call it in onblur and onclick event of text box. The function of onblur is that if the textbox is empty then the alert picture will show else picture will hide. And in onclick picture will hide. And another JavaScript function I also used to hide the picture when I open the page first time. I call this in pageload of aspx.cs page
Same things I want to do in my button Onclientclick event but it is not working because when I clicked on button the page is loaded.
How to solve this problem?

Your button click is causing postback. The simple way without seeing your code, at the end of javascript function that onclick is invoking, before the closing bracket - return false.
From the code you shared, do return false after alert();

how to trigger updatepanel within a javascript function

i have an updatepanel in my asp.net web page. I want to trigger the updatepanel within a javascript function insead of triggering with a button.
In order to do that, i used __doPostBack('myUpdatePanel', ''); function. But i think it causes the whole page postback. My document.ready function is also executed when i call this function. I may be missing some points.
Is there any other way to trigger updatepanel within a javascript function?

I think if you put a hidden button inside the update panel and you can use the javascript to fire the click of this button, it will do what you want.
<script type="text/javascript">
function Update_UpdatePaanel() {
document.getElementById('<%= YourButton.ClientID %>').click()
}
</script>
The button MUST be inside a hidden div and DON'T set visibile="false" because if you set it to false, the control will not render and the javascript will produce errors.
<div style="display:none">
<asp:Button ID="YourButton" runat="server" />
</div>

Just create a javascript function and execute the generated postback event:
<%=ClientScript.GetPostBackEventReference(myUpdatePanel, "")%>
The above statement is put on your aspx page, and it references the exact same code generated from the server to cause a postback for your panel. You can use it by putting it inside a function on the client side:
function fncUpdatePanel () {
<%=ClientScript.GetPostBackEventReference(myUpdatePanel, "")%>;
}
Then you can attach that function to any event on your page (even a mouseover event). This example uses a server side to attach the event:
myUpdatePanel.attributes('onmouseover', 'fncUpdatePanel()')

ASP.NET: Programmatically fire a server-side event in window.opener with JavaScript

I have a DropDownList that fires off some server-side databinding in its OnSelectedIndexChanged event.
<asp:DropDownList ID="ddlGroup" runat="server"
AutoPostBack="True" OnSelectedIndexChanged="SelectGroup" />
Elsewhere in the page, some JavaScript opens a popup. When the popup is filled out and submitted, I want to use JavaScript to fire that OnSelectedIndexChanged event in the opener page. I found some other code that does something similar:
if (window.opener != null ) {
var cf = window.opener.document.forms['aspnetForm'];
if (!cf) {
cf = window.opener.document.aspnetForm;
}
cf.__EVENTTARGET.value = "prAdded";
cf.__EVENTARGUMENT.value = "winClosed";
cf.submit();
}
I think this is what I'm looking for, but I'm not sure what should go in the EVENTTARGET and EVENTARGUMENT parts, or even if I need those at all. I want to specifically fire the OnSelectedIndexChanged event handler for ddlGroup. Is this possible/practical?
Secondary question: Can I make the parent page refresh AFTER I run server-side code in the popup?

Eh, you could do it that way, but I'd just use __doPostback() instead. That sets __EVENTTARGET and __EVENTARGUMENT to the two parameters, and assuming your first parameter is the UniqueID of an UpdatePanel, causes just that UpdatePanel to refresh.
So either you can set things up so refreshing the updatepanel does what you want to happen, or you can check those values on postback -- Request.Form["__EVENTTARGET"] ... and go from there.

ASP.Net ScriptManager and UpdatePanel ignoring javascript once posted back

I am having major issues using UpdatePanels on a website. The problem is that when i use a ScriptManager, all client side JavaScript that was active when the page was originally loaded is lost once an update panel posts back.
Here's what i'm trying to do...
I have a number of .net calender controls on the same page each within its own update panel. The calendars are initially hidden, until you click within an associated text box (also within the update panel), at that point the calender pops up so you can select a date. They calendars work great untill you actually change the date (post back), after which the calenders no longer pop up when you click within the text boxes, the "onfocus" JavaScript is lost.
After looking on google for what seems like hours, I can get things semi-working by dynamically adding an "onfocus" attribute to the TextBox and registering start up script with the ScriptManager when the calendar posts back.
Example:
TextBox1.Attributes.Add("onfocus", "document.getElementById('searchArrivalDateCalendarDiv').style.display = 'block';")
ScriptManager.RegisterStartupScript(Page, GetType(Page), "StopTxtClick", "$(document).ready(function(){$('.txtArrivalDate').click(function(event){event.stopPropagation(); $('div.searchArrivalDateCalendarDiv').show(); });});", True)
This seems really impractical, especially when I introduce a master page. I'm going to end up having to re-register a hell of a lot of start up script.
There must be an easier way?

It looks like you want to use event delegation. The main idea is that events bubble up and so you would attach your event handler outside of the update panel (perhaps to a div or table that the updatepanel resides in). This handler is in charge of all events it receives so even when your update panel posts back and a new textbox is rendered, you won't need to reattach the event handler. When the new textbox raises its event your existing event handler can try to handle it.
The following is just one way of doing event delegation in javascript (using jquery and taken from http://www.danwebb.net/2008/2/8/event-delegation-made-easy-in-jquery)
jQuery.delegate = function() {
return function(e) {
var target = $(e.target);
if (target.attr("showCalendar")) {
var calendar = $("#" + target.attr("showCalendar"));
calendar.css("display", "block");
}
}
}
$(document).ready(function()
{
$('#test').click($.delegate());
});
<form id="form1" runat="server">
<asp:ScriptManager runat="server" EnablePartialRendering="true"/>
<div id="test" style="width:100%;">
<asp:UpdatePanel runat="server">
<ContentTemplate>
<input type="text" id="testText" showCalendar="testCalendarDiv" />
<div id="testCalendarDiv" style="display:none;">
<asp:Calendar runat="server" ID="testCalendar1"/>
</div>
</ContentTemplate>
</asp:UpdatePanel>
</div>
</form>
In this simple example I register the delegate method on click of this div (the textbox and calendar are inside of this div). When you click the textbox the click event bubbles up to the div. The delegate method gets called and I check for the showCalendar attribute from the element who raised the event. If this attribute exists I find the element this attribute points to and update its display style. This is a pretty simple example but you could easily extend the delegate method to take in functions it will call based on some kind of rules you register.

The problem is that an UpdatePanel refresh completely wipes out the DOM within its div element(s). The easiest way to fix that is to use the live() functionality where possible, e.g.:
$(document).ready(function () {
$('.txtArrivalDate').live('click', function (event) {
event.stopPropagation();
$('div.searchArrivalDateCalendarDiv').show();
});
});

Thanks for the answers.
I still did not manage to solve this problem. However, i have found an alternate solution for the calendar pop up.
I am now using the CalendarExtender control which is part of the ASP.Net AJAX Control Toolkit. It is a much better solution for what I need. The calendar as a whole is much smoother and neater and I no longer need to use the update panel. It also supports multiple cultures without any extra coding which is great.
Cheers.