C# - Javascript Event On Page Postback

Feb 16, 2010

Is there any javascript event which is triggered on postback? If not, how can I run client side code immediately after or before a page postback?

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Similar Messages:

Forms Data Controls ::Postback Of Page Using JavaScript Postback's Slow Down The Page?

Sep 22, 2010

I'm at my wits end on this one looked/Searched/Played/Experimented and I need your help if you can.This page is going to be primarily used on a mobile device using Win Mobile 5 Need to Accomplish:Prevent Postback(serverside) of Page using JavaScript (Postback's slow down the page on mobile device)

[code]...

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How To Run A Javascript Event After A Postback Within An Updatepanel

Nov 19, 2010

How do i run a javascript event after a postback within an updatepanel

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JavaScript - Control Event Handler Not Firing On Postback?

Apr 12, 2010

I have a control which has an ImageButton which is tied to an OnClick event... Upon clicking this control, a postback is performed and the event handler is not called. AutoEventWireup is set to true, and I've double checked spelling etc.... We haven't touched this control in over a year and it has been working fine until a couple of weeks ago.

We have made changes to controls which load this control... so I'm wondering, what kind of changes could we have made to stop this event handler from being called? There is quite a bit of Javascript going on, so this could be the culprit too...

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Javascript - Does The ListBox SelectedIndexChanged Event Require Postback

Oct 25, 2010

I'm trying to add a JavaScript function to show all selected items from a ListBox as concatentated strings in a Label on the page. It's needed because AutoPostBack="true" will cause the ListBox to scroll all the way back to the first selected item.

So this code works:

<script type="text/javascript">
function Updatelist() {
var sel = document.getElementById('<%=lstbxStuff.ClientID%>');
var lbl = document.getElementById('ctl00_cph_lblSelectedStuff');

[Code]....

Unfortunately I still need the code behind SelectedIndexChanged delegate. Is there a way to use both of these without doing a PostBack? When I set AutoPostBack="false", my delegate never seems to be reached.

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Javascript - Cancel Postback In Linkbutton When Binding To Jquery Click Event?

Jan 25, 2011

I have a linkbutton to which i am binding to the click event using jQuery, however the page still posts back no matter what i try...

According to this i should be able to use event.preventDefault However nothing seems to work and it always posts back, but i do get the alert

Here is my example

<asp:LinkButton runat="server" Text="TEST" ID="lnkTest"></asp:LinkButton>
<script>
$(document).ready(function () {
var lnk = $('#<%=this.lnkTest.ClientID %>');
lnk.unbind('click.test').bind('click.test', function (event) { alert("Click"); event.preventDefault(); event.stopPropagation(); return false; });
});
</script>
UPDATE

Okay after some further investigation it seems that this does work as expected when i run it in a standalone page, however we are using this script, and it appears that it is causing a conflict..

That script moves any href='javascript:... into the click handler, im guessing that the order the handlers are assigned may have something to do with it...

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User Controls :: JavaScript Event Getting Lost And Not Working After PostBack In UserControl

Dec 4, 2012

I have created a user control.  Usercontrol contain a image.  Attached a click event on image jusing javascript function.

image.onclick = function (e) { //some code };

Now this user control is added on aspx page. Thsi is working file first time. however when the page is getting postback this event is not working.UserControl EnableViewstate is true.What should be done?

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How To Run The Javascript Function On The Page Onload Event In Content Page Of Master Page

Nov 4, 2010

HOW TO RUN THE JAVASCRIPT FUNCTION ON PAGE ONLOAD EVENT IN CONTENT PAGE OF MASTER PAGE.?

means i have masterpage and the content page of master page namely default.aspx in vb.net

My problem was that .

i wanna run javascript function in Default.aspx and i have called the function

body onload in master page..

when i run my website it shows the error

"" Microsoft JScript Runtime Error : Object Expected ""

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Postback Code In Page Load Event?

Aug 6, 2010

I have alot of code in the page load event as below.

Is it best practice to use (!NotPostBack) and wrap the code in this block or does it depend on the methods etc. I also have code which populates ajax slideshow as well which gets images from database.

[code]....

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C# - Insert Javascript Only On Page Postback

Feb 18, 2011

I'm sure this is fairly straightforward but i'm having trouble getting it to work. I want to add a javascript function to my page, but only when the page postsback. So I have a button that calls some server-side code, and when it is finished and the page is re-loading I want the javascript function to be called. Thinking about this i guess I could just add a hidden variable and set it when the button is clicked, but i think i'd rather just insert the javascript onto the page when it is loading back. Is this possible, or even a good way to do it? Edit: Okay this is my OnClick method in the C# code.

protected void Save(object sender, EventArgs e)
{
Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "alert", "<script type="text/javascript">alert('hello world');</script>");
EnforcementMatch(false);
EnforcementMatch(true);
ApplicationNotMatch();
ApplicationMatch();
Response.Redirect(Request.Url.ToString());
}

Another Edit: Just realised that the response.redirect at the bottom reloads my page cancelling out the code I put in, duh!

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Javascript - Do Postback Then Redirect To A Page

Sep 9, 2010

I'm trying to do a javascript postback and then re-direct to a different page but it keeps posting back to the current page Here's my code

$(this).prepend('<a class="booknow2 sidelink sidelinkNew" href="javascript:__doPostBack('SetSess','')"><img src="../../images1/button/leftEdge.png" width="4" height="35" style="float:left; margin:0; padding:0;" alt="book now" /><img src="../../images1/button/rightEdge.png" width="4" height="35" style="float:right; margin:0; padding:0;" alt="book now" /><span>Check availability »</span></a>');

And here's my SetSess postback command

Sub SetSess()
Session("TenHolStDateNewCheck") = "%"
response.redirect("searchresults/default.aspx")
End Sub

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Web Forms :: Does Event On Silverlight Control Postback Whole Page

Feb 21, 2010

I know silverlight page doesn't make postback itself but does event fired from silverlight control postback whole asp.net page If this silverlight,control embedded in aspx page?

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Is There An Event That Occurs After Postback, But Before The Page Is Destroyed/recreated

May 3, 2010

My ASP.NET form contains a collection of dynamically-created radiobuttons that are created and configured in the Page_Load event handler.

Normally, I process postback data in the Page_Load handler, using the condition:

if (IsPostBack)

However, since the controls that I need to access are created IN the Page_Load handler, the postback data from the previous rendering of the page is lost. To better illustrate the problem, here is an outline of the events as they occur:

1-Page_Load is invoked for the first time
2-An unknown number of radiobuttons are created dynamically
3-The radiobuttons are configured, based on information present on the server
4-The radiobuttons are added to the page's content
5-The user selects an option, and clicks the submit button
6-The Page_Load handler is invoked for the second time
7-The radio-buttons are added dynamically, exactly as before
8-The radio-button that the user checked is seemingly non-existant for processing

It seems like I need to be processing different parts of this in different event handlers. Is there an event that occurs after postback, but while the original radiobuttons are still accessible?

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AJAX :: All Controls Firing An Event On First Page Postback

Feb 8, 2010

I have a web application that shows a page containing between 6 and 20 UpdatePanels, contained with Custom Web (.ascx) Controls.

You can see an example of such a page here: [URL]

The problem I'm getting is that when the user FIRST clicks any of the radio-buttons on any of the controls in the page, ALL the radio buttons that have an active selection ALSO fire an rb_CheckChanged event (see application log below). On subsequent radio-button clicks, only that RB fires the event (as expected).

This behaviour is having a dramatic impact on performance. The page loads quickly, and a "normal" RB click provides an AJAX update correctly within 1 second. The problematic first RB click, however, takes up to SIX seconds to process, which is unacceptable from a user experience standpoint.

Developed in VS.NET 2008, ASP.NET 3.5. Also I converted the "Web Site" solution to a "Web Application" (pre-compiled) and got the same performance (still too slow). Release builds run only marginally faster than debug builds.

Why would a single RB selection change cause all RB's that have a "selection" set on them to also fire? (The "selection" is determined through database settings every time the control is populated, which is called from within the parent page control's Page_Load function. This selection is determined also at first page load, since all the controls get populated then, so why would the clicking of an RB cause them all to fire an event, and only once? That's what I don't get...)

[Code]....

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Google Maps Onclick Event To Cause Partial Postback Of Page C#?

Oct 21, 2010

I have used jQuery to invoke an AJAX webmethod in c#. This webmethod runs a query and stores the resulting information in a session variable. I have a gridview that has an objectdatasource that uses the session variable with the selectmethod to then populate the gridview with data from a query. I need the final piece to get the gridview to databind() again with the new value.

So click map, update gridview. However, maybe I'm going about this all wrong. In essence, take javascript variable, push to ASP.NET in C# and refresh gridview on page with new data from query.

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Web Forms :: Fire A PostBack Event On A Page When Close A Window?

Mar 26, 2010

The program is written using dotnetnuke and c#

Im facing the following problem. I have a aspx page (test.aspx) where I have a form what I want to do is when I hit a button on the test.aspx I open another window (getCoordinates.aspx)where I do some things and create some session variables.

When I close the getCoordinates.aspx I want to call the page load of the test.aspx so I can make use of the session variables I created and fill some textboxes

How can you refresh the 'parent' page when you close a 'child' window

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Web Forms :: Activate Event Or Postback In A Page After Close Another Window?

Nov 3, 2010

I have a main page, when i click a button, appear another window. When i close the another window, i wanna make one loop for fill my fields in the main page. How i can do that? Activate some event or something like that?

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Web Forms :: Providing Vertical Scrolling To Page In Postback Event?

Feb 27, 2010

I am using gridview in my aspx page. In that i have placed questions and related link button with text viewAnswer.Bellow that gridview i have olaced a lable . When i click on viewanswer the answer apear on lable. but here i want that the user can view lable at first sight. for that how can i provide dynamic verticle scroll to my page target as lable..

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Javascript - How To Keep Whole Page Scroll Position After Asynchronous Postback

Oct 16, 2010

i am using asp.net 4.0 iis 7.5 microsoft visual studio 2010

what i want is keep whole page (browser) scroll position (not a div or panel) when asynchronous postback happened (update panel) how can i do this actually i had a function which can keep div scroll bar position after postback like this

<script type="text/javascript">
var xPos, yPos;
var prm = Sys.WebForms.PageRequestManager.getInstance();
prm.add_beginRequest(BeginRequestHandler);
prm.add_endRequest(EndRequestHandler);
function BeginRequestHandler(sender, args) {
xPos = document.getElementById('Main').scrollLeft;
yPos = document.getElementById('Main').scrollTop;
}
function EndRequestHandler(sender, args) {
document.getElementById('Main').scrollLeft = xPos;
document.getElementById('Main').scrollTop = yPos;
}
</script>

bu i could not find browser scroll bar id to get its values to get with document.getElementById

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Web Forms :: Page Does Postback, Refresh But Event Handler Method Is Not Executed

Apr 6, 2010

I have problem with user control: MyCollection : UserControl

MyCollection contains:

[code]....

Works fine unless I register event for some button:

button1.Click += ...

When click on button, nothing happens - page does postback, refresh but event handler method is not executed. Generated HTML is bit strange. Every page control has correctly generated ClientID including parent container ID.

Button in this collection MyCollection has odd ClientID - itemsAddresses$button1

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Web Forms :: Create Via C# In An Event Causing Page Validation To Occur On Postback?

Feb 14, 2011

I'm having trouble with an image button I create via c# in an event causing page validation to occur on postback. The CausesValidation attribute is set to false at time of creation in the event. I also wire up the Click event in the page_init with postback so not to loose the event handler if the page posts another way. Here is the code I'm using in the click event of a Button. I've also tried to enable and disable viewstate for the button with no luck. What am I missing here that continues to fire page validation in the Click of this imagebutton?

[Code]....

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Javascript - Register Script After Partial Page Postback (UpdatePanel)

Aug 26, 2010

I have a simple form (textbox, submit button) which is wrapped in an update panel.

[Code]....

I type some text in the textbox, click submit, then the server creates a database record and returns an object, which has properties like ID, Name, URL, Blah, etc. These are the values that the script requires.

So if i were to call a web service from the client-code, in order to get the values that were just created, i would need to do some hacks (get last record modified that has the value of the textbox). Not ideal, and neither is two AJAX calls for one form post. (update panel postback, then web service call).

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Lose JavaScript From The Browser Cache After A Full Page Postback?

Apr 22, 2010

I have an external javascript file which I include to my page on the code behind (as seen below).

My problem is, when I my page makes a postback (not partial one), I check the loaded scripts by using FireBug, and I cannot see the javascript file in the list after the post back. I asusmed once it is included to page on the first load, browser will be caching it so that I do not need to re-include it.

What am I doing wrong?

[code]...

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Jquery - Add Dropdownlist Item From JavaScript Causes Page Postback Error

Feb 17, 2011

all elements are in an updatepanel. click on a list of <tr> to fire a JavaScript function to add new <option> to the asp dropdownlist. But, when I click on other buttons to callback to the server, I get an error message:

Uncaught
Sys.WebForms.PageRequestManagerServerErrorException:
Sys.WebForms.PageRequestManagerServerErrorException:
Invalid postback or callback argument.
Event validation is enabled using

in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation. I understand the problem. I need to let server side know the change of the dropdownlist before any other postback. Set validation as false won't work in this case, the dropdown will lose the new item anyway. I did some researches, and the possible solutions:

1)Using ViewState? Request Form? could anyone give an example?

2)Add dropdownlist item in server side. But I want to make the whole tr row clickable to fire the event. Could I click on tr and fire eg. its first child linkbutton or a linkbutton in somewhere else.

3)I've tried Jquery.ajax and webmethod , it can fire server event but since all method are static (shared) , it doesn't allow me to edit the downdownlist instance.

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Web Forms :: On Page Postback Last Clicked Button Fires Its Click Event Automatically?

Jul 15, 2010

I have page on which I've a login control in which I've a subnit button. The problem is this that when I refresh the that page the submit button or any button that was clicked last before page refresh gets its click event automatically fired.

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