C# - Execute JavaScript Before Postback?

Feb 15, 2011

Ive got on my aspx page button with code:


Is it possible to execute javascipt before postback and if result is true then do postback and go to method save_click and if not just ignore it ?


Javascript - Get Client - Side Script To Execute On Postback (from An UpdatePanel)?

Jul 15, 2010

Basically I want to get some javascript to be sent back to the client and executed from a postback inside an UpdatePanel. Furthermore this is inside of a reusable WebControl. I've tried

this.Page.ClientScript.RegisterStartupScript and this.Page.ClientScript.RegisterClientScriptBlock but Firebug shows that those scripts aren't sent back in the postback's response.

I also tried straight up writing a <script> tag inside the control's main div in the Render method, which does get sent back but isn't executed. I got a hacky solution working, but ideally looking for a cleaner solution. The hack is to add a 1x1 pixel img with width/height set to 0 and use that for an onload event to execute the script and that works, but it seems like there has to be a cleaner way to do this.

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AJAX :: Execute Animation On An Asp Button That Has To Execute Code On Postback?

Feb 15, 2011

I'm trying to understand how to execute AJAX animation on an asp button that has to execute code on Postback. In other words, I have button with code behind that needs to be excuted, but at the same time want to be able to have one of animation extenders be applied to it. I understand that I need to use the BeginRequest Event, I'm just not sure how, or which javascript commands to use to call the ajax animation so the postback will still occur.

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To Get The Postback To Execute On This Web Farm?

Apr 6, 2010

So I have an ASP.Net web forms application that is using URL Routing. It works great on the old single server shared web hosting account. It has been moved over to a new platform that appears to be a web farm. When a postback happens it now just refreshes the page and the event handler is not envoked. Another thing I've noticed is they put the application into a sub-folder on the account and are using ISAPI Rewrite to point the domain to the sub folder.how to get the postback to execute on this web farm?

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C# - Execute Server Side Code Without Full Postback

Jun 8, 2010

When a user clicks a button I need to create a .bmp file on the server. After the .bmp file is created I will load it into the html page. Would Ajax be the best way to accomplish this?

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AJAX :: RegisterStartupScript And UpdatePanel - Execute JS Function After Postback?

Jun 14, 2006

Is there a way for me to call a js function that I have registered the first time after a post back of an update panel?

In the first initial request to the page I register a script block and it works fine.

BUt it doesnt not fire or execute when the updatepanel does a post back.

I did a simple test and just did and page.ClientScript.reg...('alert("test"))

the code works so dont worry about my example syntax. I t just does an alert. The alert is executed once when the page was first requested. but not after a post back.

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Forms Data Controls :: Page Does Postback But The Breakpoint Wont Execute

Mar 12, 2010

have a gridview which has a delete linkbutton in 1 column, problem is that the click event for the button is not firing at all, the page does postback but the breakpoint wont execute and jump in the click event at all.


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DataSource Controls :: How To Execute Object Data Source Method On Postback Only

Aug 10, 2010

When my page is first loaded i receive error message stating to the effect

cant find Email for GetInvoicesByVendor.

this refers to a function in another class file:

Public Shared Function GetInvoicesByVendor(ByVal Email As String, ByVal vendorid As Integer) _

As IEnumerable

yet i only want to execute this function during the button click event and not when page is first loaded with the following parameters:

vendorid.Text = 1
txtcustomerid.Text = test@yahoo.co.uk
My objectdatasource is declared as follows:
<asp:ObjectDataSource ID="ObjectDataSource1" runat="server"
SelectMethod="GetInvoicesByVendor" TypeName="InvoiceDB">
<asp:ControlParameter ControlID="txtcustomerid" Name="Email"
PropertyName="Text" Type="String" />
<asp:ControlParameter ControlID="vendorid" Name="vendorid" PropertyName="Text"
Type="Int32" />

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Execute Javascript In Code Behind?

Jan 20, 2010

Execute javascript in code behind? can i call javascript like this

For i
Integer = 0
To 10
'call javascript code

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Execute Javascript On Logout?

Apr 11, 2010

I have this method, but the javascript never executes:

Protected Sub Logout(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.LoginCancelEventArgs)
Me.Page.ClientScript.RegisterStartupScript(Me.GetType(), "alertScript", "facebook_logout();", True)
End Sub

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Execute Javascript On Codebehind?

Aug 18, 2010

I am trying to run a javascript command like this:


And it does work for me. the problem is once a message contains spechial charachter it stop working



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C# - Is It Possible To Re-execute Javascript In An UpdatePanel

Dec 9, 2010

I have the following:

<asp:UpdatePanel ID="upd" runat="server">
<script> alert("execute again"); </script>
<asp:LinkButton ID="go" runat="server" Text="Exec JS" />

The first time the page renders the script is executed. If I click the button to cause a postback it doesn't execute again. Is there a way to make it execute the scripts again?

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AJAX :: Execute JavaScript In C# Code?

Mar 10, 2011

Basically i have two asp.net buttons on my asp.net page as follow:


and this is the code behand fo btnSave onclick event:


and this is the code behand of btnPreviwe onclick event:


as you can see, when the btnSave is clicked, it is programmatically clikced the btnPrevew first, and btnPreview registers and fires the required JavaScript. But actually once the btnSave clicked, it does go to the btnPreview_OnClick event, but for some unknow reasons, the javascript in btnPreview_OnClick doesnt work, however, when i just put cstext2.Append("alert('hi')" instead of cstext2.Append("'SaveSignature()'", the javascript does executed, and also if i modifed the asp.net code for btnPreview to this, it works too.


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Execute JavaScript When UpdatePanel Finishes?

Dec 18, 2009

I have noticed that when i have JS inside of an update panel, and the panel update, it doesn't run the JS that it repopulates...is there a way on client side to capture the updatepanel's finish so i can call that JS manually OR is there a way to get that JS to run after the update happens

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Web Forms :: How To Execute OnServerClick In Javascript

Dec 11, 2009

I it possible to execute an OnServerClick in javascript?

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Web Forms :: Execute Javascript On DataBound?

Jul 19, 2010

I have a content page that displays search criteria in a div. I would like to hide the criteria div when results are returned, but keep it visible if no results are found. I have code in the DataBound event for the gridview that displays the number of rows returned from the query which works fine. To show the search criteria, I have a RegisterStartupScript which calls the javascript function to show the div. Even though the RegisterStartupScript code is executed, the javascript never runs (I put an alert in the function that never fired). Is this a lifecycle timing issue? I just don't see how I can register the javascript earlier in the page lifecycle if it is. I would think this is a very common requirement.
Sub Master:



Sub Master.cs



Content Page:




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MVC :: Best Way To Execute A Controller Function From Javascript?

Feb 14, 2011

How can I launch a function on the server(in a controller) from javascript?

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Web Forms :: Execute Events From Code Behind Through Javascript?

Dec 21, 2009

I have a aspx page(Source) with a list box and a anchor control(HTML control) on it.When you click on anchor it opens up a modal window(target) populating list box values from aspx page.I will select couple of items from the close the modal window which will populate back to source control(list box) in aspx page. My Question is how would i call on change event of the listbox control when it once it is populated from modal window. Used all javascript to post to the modal window and populating list box.

Note: I have tried AJAX approach in which i could not able call on fire on change event as the Script method is STATIC. My goal was to select necessary items then i want to fire onchange event.

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Web Forms :: How To Prevent Function() In JavaScript To Execute

Mar 31, 2010

I only want to execute this JavaScript function runEx() if publicVarFromCodeBehind != "abc".

I am setting the publicVarFromCodeBehind = "abc" in the Page_Load event but anyway the runEx() function is executing. I wonder how this works and how to prevent runEx() from executing though I need to catch the logic from C# and pass on the variable to the JavaScript.


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AJAX :: If(confirm) Javascript Execute In Code C#?

Jan 22, 2010

i'm a beginner with c# 2.0 and ajax

i have two radio button and i want to execute a javascript if user selected the second radio button

i want execute a javascript if confirm(message)

but i wonder if it possible to GET the value of the if (confirm) if user has click ok or cancel !?

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JQuery :: Execute Code Behind Function In Javascript?

Sep 29, 2010

I had a custom confirm box Using Jquery....In that It crates two buttons Yes and No. I need to execute my code in Yes click.....how?

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JQuery :: How To Execute Code Using JavaScript Function

Jun 11, 2010

I have downloaded a jquery tool which creates overlay windows so here is the code which I want to trigger by calling a javascript function instead of a button or link.



The HTML note the overlay is executing when i click the button i want this to be triggered on javascript function)



All i want to do is call a function lets say "ShowOverlay()" from my code behind using ClientRegisterScript() and it should do the same as it is doing on button.

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Execute JavaScript On AJAX Panel Load?

Dec 23, 2010

I want to run a JavaScript function to initialize some controls.

My problem is that the controls are on a Telerik control's form template that is displayed using AJAX.

Is there a way to specify the JavaScript function executes whenever this template is displayed?

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Web Forms :: How To Perform Click (postback From JavaScript) On The Button From JavaScript In Opera

Sep 3, 2009

i have a TextBox and Button.in Codebehind if the page i added following, to register my script:

protected void Page_PreRender(object sender, EventArgs e) {
Page.ClientScript.RegisterStartupScript(Page.GetType(), "textBoxSet", "textBoxSet(document.getElementById('" + QueryTextBox.ClientID + "'));", true);


but still, Opera has no affect of executing this script.so, how to perform click on the button, i mean to perform a postback from JavaScript with the target of the searchButton ?

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Javascript - Execute Some Custom Code Before AJAX Request Is Sent

May 10, 2010

I have a drop down in an ASP.NET page. Whenever the value of the drop down changes an ASP.NET AJAX request is made to the server. I also attached a jQuery "change" event handler to that list to execute some code when the value is changed. So, probably two different event handlers are being attached to the same drop down, and it's causing some problems, i.e., sometimes wrong drop down values are sent to the server. I don't know why is this happening but I think attaching two different event handlers to a same drop down may be the reason.

Can anyone tell me what is the problem here? If what I guessed is true, then is there any other way to execute some custom javascript code before asp.net AJAX request is sent ?

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Web Forms :: How To Execute Javascript Function In Code Behind Page

Jul 30, 2009

I have a javascript function in my web user control

function ShowContinue()
alert("hello world");

I have to execute this function in code behind page.

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Web Forms :: How To Execute Javascript Function On Page Load

Apr 23, 2010

I have created javascript function as mentioned below to hide/show some control. I am calling this script on dropdown on 'onchange' method. In dropdown first item is "-- Select --". I want to execute it on Page Load function, so by default it will be hidden. I tried to call like this on Page load, but it is not working.

ddlEmpType.Attributes.Add("onchange", "HideDD('-- Select --');");


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Web Forms :: Execute Javascript After Built-in Autopostback Call?

May 28, 2010

I have a DataList that has a column with a checkbox in it. The checkbox has its AutoPostBack property set to true. During the DataList's OnItemDataBound event, I am registering a javascript method to the control:

chk2.Attributes.Add("onclick", "CheckAdvanceChecked(this);"); The purpose of this method is to determine if any of the programmatically checkboxes in the DataList are checked, and if so, disable some of the other controls on the page. My problem is that when the HTML is generated, my 'CheckAdvanceChecked' function is being placed (and executed) prior to the javascript that ASP automatically adds to the checkbox (due to its AutoPostBack property): <input id="checkAdvanceList_ctl01_chk" type="checkbox" name="checkAdvanceList$ctl01$chk" onclick="CheckAdvanceChecked(this);

etTimeout('__doPostBack('checkAdvanceList$ctl01$chk','')', 0)" Value="760" /> I need my CheckAdvanceChecked(this); function to to be place after the 'setTimeout' function that ASP generates automatically so it will execute last. Is this possible?

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AJAX :: Execute Javascript After Modal Popup Shown

Nov 3, 2010

Using ASP.NET 2.0, VB code behind, I am using a ModalPopupExtender to show some dynamic content on my site inside an update panel. The problem I am having is that sometimes the content stretches the modal pop-up panel (div) so that it flows off the screen. In cases where the height of the popup panel exceeds some defined height I would like to limit the height and add a vertical scroll bar (otherwise the panel should have no height minimum).

I have written a JavaScript to perform this task (see below). I use my code behind to display the modal popup... so now my problem is how (when) do I kick-off my javascript to limit the height of my modal popup. Kicking off the script on pageLoaded finds that the popup container's display setting has not been set yet, therefore ConstrainPanelHeight is never executed... how can I kick off my javascript after the model popup is shown?


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Call Javascript Function From C# Code - Next Line Must Execute

May 11, 2009

i need to execute javascript function in the mid of C# code from the result of javascript function i have to execute some lines

function checklocatio(location)
if(location with in sama state)
return result;

code behind

C# code
C# code
C# code
execute javascript function "checklocatio(location)"
C# code
C# code

is it possible how can i do it the next line must be execute after executed of javascript function

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Possible To Execute Some Javascript From An Page That Would Resize The Browser Window

Dec 11, 2008

Is it possible to execute some javascript from an aspx page that would resize the browser window.I dont want to add javascript to the master page because other pages use the same master page.

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Dynamically Execute Javascript Method On Pageload Event?

Nov 4, 2009

This is i wrote sample code in pageload event ..i need to display data into Textbox on pageload ..

Now i am getting any result ..check my code

protected void Page_Load(object sender, EventArgs e)
string script = string.Empty;
script += "<script language='javascript'> function abc()";
script += "{document.getElementById('TextBox1').value='a2'}";
script += "</";
script += "script>";
Page.RegisterStartupScript("abc", script);

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C# - How To Execute Javascript In A Dynamically-added User Control

Jan 30, 2010

I have a GridView of thumbnail photos within an UpdatePanel, with clickable icons in each row which each load a User Control containing a small Google Map into the relevant row. The idea is that the user can geotag (by clicking on the map) any photo in the GridView.

In the map User Control, there is some Javascript initialising the map:

function initializeMap() {
if (GBrowserIsCompatible()) {
var map = new GMap2(document.getElementById('Map'), {size: new
GSize(336, 200)});
// set the map controls, set the centre, etc.

Problem is: I don't know how to call the initializeMap() method. Because it's dynamically added to the page, any attempt to link it to the calling button by "onClientClick=initializeMap()" for example, gives a JS error, saying the method isn't defined.

I've tried

ClientScript.RegisterStartupScript(this.GetType(), "initializeMap", "<script type="text/javascript">alert('Here'); initializeMap();</script>");

but I don't think I'm on the right track with that one either.

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Execute A Javascript Function When Textbox Is Populated In JQuery?

Jan 4, 2010

How do I execute a function in JavaScript when a text box is populated with text? The text box with be hidden from the user. It will be populated by a USB magnetic card swiper.

Pseudo code:

<script language="javascript" type="text/javascript">
function MyFunction() {
//execute this function when MyTxtBox is populated
<asp:TextBox id="MyTxtBox" runat="server" Visible="false" />

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Web Forms :: Execute Server-side Code From JavaScript?

Jun 11, 2010

Executing Server side code using Javascript. Here is the solution.In the Asp.net forums, I often see the question asked, "Can I call server-side code from the client/JavaScript?" Almost invariably, the responses given are "No, the client cannot access the server," or "You can only use WebMethods or PageMethods." The first response is not entirely correct, and unfortunately, WebMethods and PageMethods are static methods and therefore have no way to directly access the page.This is why I present to you the following "hack". I call it a hack because there really should be some way built into the ASP.NET AJAX Extensions that allow this approach directly. Instead, it relies on using controls in a manner that they aren't necessarily intended in order to obtain the desired result. But this "hack" does have a redeeming quality—it's incredibly easy.The Code:

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default2.aspx.vb" Inherits="Default2" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">


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Execute JavaScript From Code - Behind After UpdatePanel Has Finished Loading Its DOM Elements?

Jul 7, 2010

I have an UpdatePanel with a repeater in it that is re-bound after a user adds an item to it via a modal popup. When they click the button to add a new row to the repeater the code-behind looks something like this:

protected void lbtnAddOption_Click(object sender, EventArgs e)
SelectedOption = new Option()
Account = txtAddOptionAccountNumber.Text,
Margin = chkAddOptionMargin.Checked,
Symbol = txtAddOptionSymbol.Text,
Usymbol = txtAddOptionUsymbol.Text,
Presenter.OnAddOption(); // Insert the new item
RefreshOptions(); // Pull down and re-bind all the items
mpeAddOptionDialog.Hide(); // Hide the modal
// ... Make call to jQuery scrollTo() method here?

This works fine and the new row will show up quickly via the UpdatePanel. However, there are often hundreds of rows and where the new one is added is based on the current sorting column used. So, I wanted to take this as a chance to use the sweet jQuery ScrollTo plugin. I know that if I give it the ID of my overflowed container div and the ID of an element within it, it will smoothly scroll straight to the users newly added row. However, there are two problems:

I need to find the appropriate row so I can snag the ClientID for it. I need to execute the jQuery snippet from my code-behind that will cause my newly updated repeater to scroll to the right row. I've solved #1. I have a reliable method that will produce the newly added row's ClientID. However, problem #2 is proving to be tricky. I know I can just call ScriptManager.RegisterStartupScript() form my code-behind and it will execute the JavaScript on my page.

The problem I'm having is that it seems that it is executing that piece of JavaScript before (I'm guessing) the newly refreshed DOM elements have fully loaded. So, even though I am passing in the appropriate jQuery line to scroll to the element I want, it is erroring out for me because it can't find that element yet. Here is the line I'm using at the end of the method I posted above:

string clientID = getClientIdOfNewRow();
ScriptManager.RegisterStartupScript(this, typeof(Page), "ScrollScript", String.Format("$("#optionContainer").scrollTo("{0}", 800);", clientID), true);

What do I need to do so I can ensure that this line of JavaScript isn't called until the page with the UpdatePanel is truly ready?

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Write And Execute Textchange Event Handler In Javascript And Code Behind?

Dec 22, 2010

in my asp.net website, i have textbox control inside datagrid control. I would like to add textchange event in javascript where i need to sum the values inside textboxes in datagrid and show that addition in lable outside grid. I would also like to do same addition in codebehind(*.cs) But codebehind only execute when browser not support javascript. It means when browser support javascript only client side javascript should execute not server side code

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Execute A JavaScript Function When Textbox Is Populated And Focus Is Still Set In JQuery?

Jan 5, 2010

How do I execute an JavaScript function right when an ASP.NET text box control is populated and focus is still set? The onChange event will not work because I need to programmatically move focus to the next form element after the JavaScript function has executed.

Is is very similar to this question. The marked answer is correct for the context on the question, but after some more testing it did not exactly solve my current issue.

Pseudo code:


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How To Execute A JavaScript Function On Page Load In Studio 2008

Nov 3, 2008

How do I execute a JavaScript function on my page load in studio 2008?

I tried like

body = (System.Web.UI.HtmlControls.HtmlGenericControl)Page.FindControl("body");

But my 'body' variable gets null when I execute the page.

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Forms Data Controls :: How To Execute Javascript Function From Datagrid Row

Sep 15, 2010

I need to execute a javascript function when a row of a datagrid is clicked. I am not sure how to do this.

I have tried adding a template column with a button


And then attaching the javascript to it:


But it produces an error.

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