I want to autopost a page in Page_Unload. When I write Response.Redirect, I got error.
Want to achieve show Data List. I'm databinding it, but it shows after refreshing the page.
Can somebody help me?
protected void Page_Unload(object sender, EventArgs e)
{
...
DataList1.DataBind();
//autopostback in this line
}
You can't do anything like that in the Unload event.
Whe the Unload event happens, the page has already been rendered and sent to the browser, so it's too late to do anything to change the response.
Besides, making a postback from server code doesn't make sense, as that would simply create an eternal loop without anything ever being sent back to the browser. If you want to make a postback when something happens in the browser, you would do that using Javascript, not in the server code.
use the PreRender event instead of UnLoad.
Note: I know its old question but I believe some one would get use of this answer.
Related
I have some long code on server side that runs on Page_Load(). My problem is that users don't see nothing until this code is over
I want to show them some loading picture so that they will know that something is happening. I tried to put some JavaScript alert() on page but it didn't helped. I tried to changed html from server-side but of course it only shows the changes after job is done.
protected void Page_Load(object sender, EventArgs e)
{
// show user a loading image
// start heavy coding
}
You can use AJAX or UpdatePanel to separate loading and user-visualizing processes.
In this case you just need pageLoad() - js function, which will call proper, for example, web-service-method and shows loading image. OnSuccess\OnError events if ajax call will help you to handle the result of this call
i am trying to build a timer in my asp.net website.
so, when you click on a button, lets say hes id = "Button1." it will make the button disable(with enable = false command) and after few\4secconds it will enable=true again.
i have tired to look around how to to so, but all guilds online are very old.. and nothing is realyl helpfull.
This is the full code name(just for the exple):
protected void Button1_Click(object sender, EventArgs e)
{
}
Thanks alot! please help me :).
Have a look at the following answer it should be what you are after:
Disable an asp.net dynamic button click event during postback and enable it afterwards
you cant do that in the server side. youll have to do it in client with setTimeout Js function with 4000 ms.
you have to understand that when you see the page - ther server doesnt know the page anymore. and he cant post back by himself.
I need to cause a postback in c#, how can i do this? (It can not be through a button or any other element) Just want to cause a postback if a condition is met.
something like
If(so and so)
Postback now!
else
Do not post back
From the comments it looks like you are using telerik's RadTabs. You could potentially set AutoPostBack to true on the tab control so that it would force a refresh whenever the user switches tabs.
http://www.telerik.com/help/aspnet/tabstrip/tab_server-side%20events.html
Your question does not make sense.
C# code runs on the server, in response to a postback.
Until a postback happens, no code can run.
You may want to trigger a postback in Javascript, which runs in the browser.
Some didactic contextualization: whatever piece of code you are trying to call in your "second postback", just call it in your "first postback" already!
Example:
You have a method you want to call, say, a Button_Click in your "second postback"? Just call it in you "first postback":
btnSaveClick(btnSave, null);
You can always do a Response.Redirect(Request.RawUrl);.
You'll want to be careful that you don't cause an endless redirect loop.
To force a postback in Server code, use ClientScript.GetPostBackEventReference() to generate the javascript code that does the postback. Then add a startup script in your event handler that calls the postback javascript.
aspx:
// Do an empty postback that doesn't do anything.
function doPostback() {
<%= ClientScript.GetPostBackEventReference(btnDoPostback, String.Empty) %>;
}
<asp:Button ID="btnDoPostback" runat="server" OnClick="btnDoPostback_Click" Style="display: none;" />
cs:
if (!IsPostBack) {
ScriptManager.RegisterStartupScript(this, this.GetType(), "dopostback", "doPostback();", true);
}
protected void btnDoPostback_Click(object sender, EventArgs e)
{
}
You can't do a postback in your code-behind. Your code-behind code IS your postback code. Why are you trying to do this? Maybe we can help you in your program logic
Did you want to call the page again? You can do this with a Response.Redirect
Do you mean on your .aspx/cshtml pages? If so use jquery's $.post
If you really are in a controller (and you are already running in response to a postback) then you should probably refactor your code so that whatever logic you want to call (via your 'second post' back) can be called from your existing location as well as your other Post action.
I want to know what exact events fires when ASP.NET page load event fires. As i am using a lightbox in which some insertion is going on and after insertion i want that the parent page reloads with the new value loaded in gridview which i have in parent page. In light box page i added javascript event of parent window reload but sometime it works sometimes it reloads but after refresh newly insert values shows, please help me what i am doing wrong thanks in advance.
I think you have isPostBack check in parent page. Try to remove it for test.
here is asp.net page lifecircle
http://msdn.microsoft.com/en-us/library/ms178472.aspx
I'm trying to understand your question. Am I right in thinking that you are calling window.location.reload() in javascript but when the window reloads, the new inserted content isn't always there?
It sounds like you either have a caching issue or you need to insert a brief wait interval before you reload the page. Does this help you?
Is there a way to click a link programatically, so that it has the same effects as if the user clicked on it?
Example:
I have an ASP.NET LinkButton:
<asp:LinkButton id="lnkExport" runat="server" CssClass="navclass">Export</asp:LinkButton>
I have a link on a sidebar directing to the .aspx page that has this linkbutton on it. For various reasons I can't have the code for the LinkButton executed until the page has refreshed -- so I am looking for a way to force-click this LinkButton in my code once the page is completely loaded. Is there a simple/doable way to accomplish this? If it involves triggering an event, please provide a code sample if you can. Thanks.
Triggering a click event programatically on a link will trigger the “onclick” event, but not the default action(href).
And since linkbuttons come out as hrefs, so you could try doing this with Javascript.
var lnkExport = document.getElementById('<%= lnkExport.ClientID %>');
if(lnkExport){
window.location = lnkExport.href;
}
I certainly think that, there is a design and implementation flaw which forces you to conclude as you described.
Well, invoking the click event means nothing but executing the event registration method.
So, the worst suggestion I can think of is, just call the function at what point you want to happen the click event like,
lnkExport_Click(lnkExport, new EventArgs());
Rashack's post show's how to do it. You can just do it in javascript.
function ClickLink() {
document.getElementById('').click();
}
If you want this to fire after some other event, you can add code in c# to add a call to that function on the client side when the page loads.
Page.ClientScript.RegisterStartupScript(
this.getType(),
"clickLink",
"ClickLink();",
true);
I'm not sure why you'd need your page to load if you're just wanting to programmatically click that link. I'd recommend using Response.Redirect() on the server side to redirect them to that page. Not sure if there are other extenuating reasons this simple approach won't work...
--Matt
If i understand what you're saying:
<asp:LinkButton id="lnkExport" runat="server" CssClass="navclass" onclick="lnkExport_Click">Export</asp:LinkButton>
then in your codebehind or whenever call the following when you need to...
lnkExport_Click( null, null );
and make sure you've got lnkExport_Click wired up.
protected void lnkExport_Click( object sender, EventArgs e )
{
//DO Whatever here
}
<button onclick="document.getElementById('<%=this.lnkExport.ClienID%>').click()">
click me</button>