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ASP.NET show div on button click

am trying to show a loading div on button click, but it is not working at the moment.
Javascript :
<script type="text/javascript">
$(document).ready(function (e) {
$('#BtnSend').click(function () {
$('#<%= loading.ClientID %>').toggle("slow");
});
});
</script>
Div:
<div id="loading" class="Loading" runat="server" visible="false">
<div class="loadingImg">
<img src="../Images/loading.gif" alt="loading" />
</div>
</div>
Button:
<asp:Button ID="BtnSend" runat="server" Text="SEND"
onclick="BtnSend_Click" CssClass="pressbutton2" Height="36px" ClientIDMode="Static" />
the div is set to runat server so that I can change its visibility also through code.

Use the onClientClick for the asp button. Then make the jquery function that you ahve called BtnSend_Click
If you want to do it via Client side:
jQuery
function BtnSend_Click () {
$('#<%= loading.ClientID %>').toggle("slow");
}
ASP Button
<asp:Button ID="BtnSend" runat="server" Text="SEND"
onClientClick="BtnSend_Click" CssClass="pressbutton2" Height="36px" ClientIDMode="Static" />
If you want to do it via the server:
C#
protected void BtnSend_Click(object sender, EventArgs e){
loading.Visibility = 'visible' //not sure on syntax to show it in code behind off the top my head
}
ASP Button
<asp:Button ID="BtnSend" runat="server" Text="SEND"
onClick="BtnSend_Click" CssClass="pressbutton2" Height="36px" ClientIDMode="Static" />

The ASP.Net AJAX library has an UpdateProgress control that sounds like it would fit your needs.

I've tried adding in a prevent default, as the code as described below would postback before the loading div was shown otherwise.
<script type="text/javascript">
$(document).ready(function (e) {
$('#<%= BtnSend.ClientID %>').click(function (e) {
e.preventDefault();
$('#<%= loading.ClientID %>').toggle("slow");
});
});
</script>
Another thing I've noticed is you have set Visible="false":
<div id="loading" class="Loading" runat="server" visible="false">
This means the div doesn't exist as its not output from the server side. Look in the view source when the page loads, it wont be there and hidden, its just not there. Remove the visible="false" and use CSS to hide it to start off with.

ASP.NET Google Map Resets On Submit_button press [duplicate]

I am using AJAX in asp:net and am trying to handle a situation where an asp:button triggers both a javascript method and a codebehind c# method. To do this I am using onclick and onClientClick attributes for the button. I need a postback to occur for the codebehind to be called however this postback causes the javascript to not work because variables have lost state. Can anyone describe how to handle this? Possible with ajax and async postbacks? It's starting to drive me a bit crazy!
Edit:
The javascript is actually for a google-map (v3), the c# code is for submitting to an sql db.
The map is initialized in the code-behind with:
protected void Page_Load(object sender, EventArgs e)
{
if(!Page.IsPostBack) {
ScriptManager.RegisterStartupScript(this, this.GetType(), "onload", "initialize_map();", true);
submitButton.Command += new CommandEventHandler(this.submitButton_Click);
}
}
Here is some of the relevant code:
<asp:UpdatePanel runat="server" ID="Form" UpdateMode="Conditional">
<ContentTemplate>
(...form stuff...)
<asp:Button ID="submitButton" runat="server" Text="Submit" ValidationGroup="NewCallFormSubmit" OnClientClick="calcRoute(); return false;" onclick="submitButton_Click" />
</ContentTemplate>
</UpdatePanel>
<asp:UpdatePanel runat="server" ID="DisplayUpdatePanel" UpdateMode="Conditional">
<ContentTemplate>
<h1>
Pick-Up and Drop-Off Locations
</h1>
<!-- Map Layout -->
<div id="map_canvas" style="width: 500px; height: 500px;"></div>
</ContentTemplate>
</asp:UpdatePanel>
...I think it would work if I could get the first updatepanel to postback on the button click, the second panel not to postback, and the button to still call the codebehind. So far no luck with this all happening at the same time.

If you simply want to run your OnClientClick (client) code before your OnClick (server) code, try the following:
ASP.NET
<asp:Button ID="btn_mybutton" runat="server" Text="MyButton" OnClientClick="return JSFunction();" OnClick="CFunction"/>
Javascript
<script type="text/javascript">
function JSFunction() {
alert('Some JavaScript stuff');
return true;
}
</script>
C#
protected void CFunction(object sender, EventArgs e)
{
// Some server code
}
The JavaScript function is executed first and returned from before the server code is executed.

Why IE does not refresh the page after a JS call to a click button?

On a ASP.Net page, I am in front of a problem only with IE. Here is the description.
On a page, there is two buttons and one label. The first button is visible and calls a JS function on the click event. This JS function calls the click function of the second button. The second button has an C€ event handler on the click event. The C# event handler edit the label.
In Firefox : the label is correctly edited after the clicks.
In IE (8) : the label is not edited, despite the C€ event handler has been correctly hit.
Also, I observed, in IE, that the Page_Load event is called two times after the JS button click :
Page_Load
button2_OnClick => change of the Label Text
Page_Load => The Label Text is reset :(
In Firefox, the Page_Load is called only once.
My question is : how to make IE refresh correctly the page as Firefox does after a JS button click ?
Below is the sample test code :
1) Page ASPX
<head runat="server">
<title></title>
<script type="text/javascript">
function button1Click(sender, args) {
var button2 = document.getElementById("button2");
button2.click();
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button runat="server" ID="button1" Text="Click-me!" OnClientClick="button1Click();" />
<asp:Button runat="server" ID="button2" Text="Second" OnClick="button2_OnClick" style="display:none" />
<p />
<asp:Label runat="server" ID="label1" Text="Init" />
</div>
</form>
</body>
</html>
2) C# code-behind :
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void button2_OnClick(object sender, EventArgs e)
{
label1.Text = "Changed";
}
}

The ID of your button will not be button1 or button2 when it's rendered. It will probably be something like ctl001_button1. Therefore your javascript will not work. In ASP.NET 4 you can override this behaviour by using an assigned ClientID.
<asp:Button runat="server" ID="button1" Text="Click-me!"
OnClientClick="button1Click();" ClientIDMode="Static" />
<asp:Button runat="server" ID="button2" Text="Second"
OnClick="button2_OnClick" style="display:none" ClientIDMode="Static" />
As an aside, this alludes to the main problem with ASP.NET Winforms - it tricks developers into thinking that the web is a connected environment.
What actually happens when you click an <asp:Button /> element by default is that a postback is invoked. I.e. Your browser sends a request to the server for a new page. It sends up something called ViewState which is how the server knows what you've done and what to render. There is no "event" handled as such.

I think the problem is with the way you are trying to get the hidden button
var button2 = document.getElementById("button2");
maybe change this to
var button2 = document.getElementById("<%= button2.ClientID %>");
After the buttons are rendered in the browser, the ID is changed by the ASP.Net engine, and not the same as your source.
http://msdn.microsoft.com/en-us/library/system.web.ui.control.clientid.aspx
Hope this helps.

How to hide/show a control using AJAX (AjaxControlToolkit) and C#

I know this must sound really basic but I'm really stumped here. What I'm trying to do is to show a Hyperlink once a process has completed. And this process is the AsyncFileUpload. In the ASPX page, I want to create an but have it hidden on the initial page load. If I set the Style="display: none;" seems to work but after the file upload, nothing I do, will make the control visible again. When the file is uploaded, it calls a function called FileUploadComplete. It's in here that no matter what I do, the Hyperlink won't display.
Any help is greatly appreciated :)
Thank you,
dave
Here is the ASPX Code (with recently added javascript)
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="OptionsPlaceHolder" runat="server">
<script language="javascript" type="text/javascript">
function ShowLink() {
$("#openFile").show();
}
</script>
</asp:Content>
<asp:Content ID="Content3" ContentPlaceHolderID="ContentPlaceHolderBody" runat="server">
<asp:UpdatePanel ID="updImportFile" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<div class="pageHeader">
<asp:Literal runat="server" ID="pageTitle" Text="<%$ Resources:Resources, ImportFile %>" />
</div>
<ajaxToolkit:AsyncFileUpload ID="FileUpload1" runat="server" Width="600px"
UploaderStyle="Traditional" OnUploadedComplete="FileUploadComplete" ThrobberID="throbber"
CompleteBackColor="#E9F2FD" OnClientUploadComplete="ShowLink" />
<asp:Image runat="server" ID="throbber" ImageUrl="images/loading.gif" />
<br />
<asp:Hyperlink runat="server" ID="openFile" NavigateUrl="~/OpenFile.aspx" Text="Open"
style="display:none;"/>
</ContentTemplate>
</asp:UpdatePanel>
</asp:Content>
And here is the code behind:
protected void FileUploadComplete(object sender, EventArgs e)
{
if (FileUpload1.HasFile)
{
string importName = Server.MapPath(#"Uploads\") + FileUpload1.FileName;
FileUpload1.SaveAs(importName);
// Import the JSA
JSA jsa = new JSA();
jsa.Import(importName);
// Show the Hyperlink
ShowLink();
}
}
private void ShowLink()
{
openFile.Attributes["Style"] = string.Empty;
}
I didn't include the master page code. It has the ToolkitScriptManager in it.

Are you trying to show on client-side or server-side? Is the link a client-side, or server-side object? Javascript would be the standard way.
If the control is a client-side object:
document.getElementById("hyperlink_name").style.display = "block";
Or if it is a server-side object:
document.getElementById("<%= hyperlink_name.ClientID %>").style.display = "block";
I would recommend getting jQuery and using the following though:
$('#hyperlink_name').show();
Or you can use an ASP.Net Link Button and do it server-side:
linkButton.Visible = true;

It would be more helpful if you would post some of the code you have tried already so that we can get a better idea of where you are.
{first answer deleted}
[EDIT :I didn't catch that you are using AsyncFileUpload when I first read the question]
Using AsyncFileUpload inside an update panel the server is being accessed via a partial postback, as a result other controls (the hyperlink) cannot be affected on the server. This will require that you make use of javascript (or preferably jquery) to make the change on the client.

You can do it on OnClientUploadComplete function, but you have to reference the hyperlink like this: <%= hyperLink.ClientID %>.style.display = 'block';
Another more asp.net way is to use update panels. Put the hyperlink into an UpdatePanel and set a trigger on the UpdatePanel when the file is uploaded. then change the visibility on the server at UploadedComplete event.

change masterpage image src from page in update panel C#

I have a master page that contains an image as follow:
<asp:Image ID="imgCompanyLogo" runat="server" ImageUrl="image path" />
and in a child page I want to edit the property ImageUrl as follow:
Image imgCompanyLogo = (Image)Page.Master.FindControl("imgCompanyLogo");
imgCompanyLogo.ImageUrl = ResolveUrl("~/images/CompanyLogo/Logo.png");
and it doesn't give me an exception, but it doesn't change anything.
Note: I have an UpdatePanel in the child page.

Since the image is sitting outside of the UpdatePanel, server side changes will not be executed on the image after a partial postback. Your only option is to inject JavaScript into the page and change the image URL.
Use the ScriptManager.RegisterStartupScript Method to inject JavaScript after the partial postback.
Something like the following will work for you:
C#
protected void btnPostback_Click(object sender, EventArgs e)
{
imgCompanyLogo.ImageUrl = ResolveUrl("~/images/CompanyLogo/Logo.png");
ScriptManager.RegisterStartupScript(btnPostback,this.GetType(), "myScript", "ChangeImage('" + ImageUrl + "');",false);
}
JavaScript
function ChangeImage(imgURL) {
//make sure the ID of the image is set correctly
document.getElementById('imgCompanyLogo').src = imgURL;
}

Wrap image by UpdatePanel with UpdateMode="Always"
Master Page:
<asp:UpdatePanel runat="server" UpdateMode="Always">
<ContentTemplate>
<asp:Image runat="server" ID="Image1" />
</ContentTemplate>
</asp:UpdatePanel>
<asp:ContentPlaceHolder ID="MainContent" runat="server">
</asp:ContentPlaceHolder>
public void SetImageUrl(string url)
{
Image1.ImageUrl = url;
}
Child Page:
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
<asp:UpdatePanel runat="server">
<ContentTemplate>
<asp:Button Text="Click Me" runat="server" OnClick="UpdateImage" />
</ContentTemplate>
</asp:UpdatePanel>
protected void UpdateImage(object sender, EventArgs e)
{
((Main)Master).SetImageUrl("~/Images/0306d95.jpg");
}
The code above works well for me.

Have a look at Sys.WebForms.PageRequestManager Class. Define handler in javascript and may change the image source.

If your code is being run after an async postback (per your UpdatePanel) then changes to anything outside the UpdatePanel will not be rendered. Content in the master page would definitely seem to qualify.
If this is what you're trying to do, this model won't really work. You will need to use some client script to effect changes to already-rendered content when working with this model.
An UpdatePanel is a construct to identify an area that's updated through ajax. The page is not actually reloaded. So an postback can never change content that's outside of the UpdatePanel (or control bound to that panel) that sourced it.
Here's a basic implementation (using jQuery). Add a hidden field to pass the new source to the client. This must be inside the UpdatePanel. Change this value from the server when you want the image to update with new_image_src.Value=ResolveUrl(...);
<asp:HiddenField ClientIdMode="Static" runat="server" id="new_image_src"
value="" EnableViewState="false">
Give your image a static id too to make life easier:
<asp:Image ClientIdMode="Static" runat="server" id="dynamic_image" ImageUrl="..." >
Add javascript to the page (should NOT be in the UpdatePanel):
function updateImage() {
var new_src=$('#new_image_src');
if (new_src) {
$('#dynamic_image').attr('src',new_src);
/// erase it - so it won't try to update on subsequent refreshes
new_src.val('');
}
}
$(document).ready(function() {
/// adds an event handler after page is refreshed from asp.net
Sys.WebForms.PageRequestManager.getInstance().add_pageLoaded(updateImage);
});
This wouldn't be difficult to do without jquery either but seems more common than not these days.