Can you open a new window from a post back?

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Can you open a new window from a post back?

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Last post 08-13-2009 3:23 AM by dhinakaranpc. 10 replies.

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Can you open a new window from a post back?

12-31-2003, 12:46 PM

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30,305 point All-Star
PLBlum
Member since 06-28-2002, 1:20 PM
Boston, MA
Posts 5,343

This question has been asked time and time again. When the server sends HTML to a browser, these two rules are followed:
1. The browser must have requested the page via an HTTP GET or POST. (The server cannot change a page without the browser asking for it.)
2. The browser will only retrieve the HTML into the window that requested it.

There are only two ways to open a new window that I know about:
1. The <a> tag includes a target= property specifying a new window. (The HyperLink webcontrol is simply a way to generate the <a> tag. It includes a Target property.)
2. Use JavaScript such as a window.open or window.createPopup.

The <a> tag opens the new window before posting back and requests the new HTML from that new window.

The JavaScript technique requires that the original page already contains the JavaScript or when the server posts back, the browser is sent new HTML containing the new JavaScript to the original window. That means the original page's contents are replaced.

If you want to use the JavaScript technique to open a new window on post back:
1. Prepare the HTML necessary for the original page to draw.
2. Use Page.RegisterStartupScript() to call window.open. This will allow the new window to popup as the original window is loaded.

--- Peter Blum
Creator of Peter's Data Entry Suite (formerly Professional Validation And More and Peter's Date Package) and Peter's Polling Package
www.PeterBlum.com

Re: Can you open a new window from a post back?

02-04-2004, 5:11 AM

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ariya
Member since 01-27-2004, 6:16 AM
tehran - iran
Posts 81

hi all ,

you can do it, just read this and you have done it !

http://dotnetjohn.com/articles/articleid88.aspx

ariya

Re: Can you open a new window from a post back?

02-06-2004, 1:22 PM

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PLBlum
Member since 06-28-2002, 1:20 PM
Boston, MA
Posts 5,343

The article makes sense although it opens a window based on a click after the page reloads, not immediately on post back.

--- Peter Blum
Creator of Peter's Data Entry Suite (formerly Professional Validation And More and Peter's Date Package) and Peter's Polling Package
www.PeterBlum.com

Re: Can you open a new window from a post back?

06-09-2008, 2:43 PM

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2 point Member
aiasso
Member since 06-09-2008, 6:36 PM
Posts 1

I found a way to do this using JavaScript. I've tested it with the ImageButton control using ASP.NET 2.0.

The approach is to add an onClick attribute to the tag that changes the form's target to the new target:

MyImageButton.Attributes.Add("onClick","this.form.target='" & Target & "'")

where Target is the target you want (eg. "_self","_top","PrintPreview", etc.)

I would think this would also work for Hyperlinks, etc. as well, though I haven't tested it.
Note the concatenation above uses ' quotes around the target name. The output in HTML would look like:

Filed under: asp.net 2.0 and Javascript

Re: Can you open a new window from a post back?

06-21-2008, 6:24 AM

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528 point Member
kathirvelmm
Member since 05-05-2008, 7:46 AM
Chennai-India
Posts 160

1    <%@ Page Language="C#" AutoEventWireup="true"  CodeFile="FtpUpload.aspx.cs" Inherits="_Default" %>
2    
3    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
4    
5    <html xmlns="http://www.w3.org/1999/xhtml" >
6    <head runat="server">
7        <title>Untitled Page</title>
8        <script type="text/javascript" language="javascript">
9        window.close=tt();
10       function tt()
11       {
12           window.open(href="http://192.168.16.30/swlc" ,height="200", width="200");
13           }
14       </script>
15   </head>
16   <body bgcolor="linen">
17       <form id="form1" runat="server">
18   </form>
19   </body>
20   </html>
21

This has been tested and works.

Kathirvel
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Please mark as Answer if this solves your problem, Let other users get benefited.

Re: Can you open a new window from a post back?

06-27-2008, 11:08 AM

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CHolt
Member since 12-27-2006, 4:39 PM
Posts 184

The only problem with using window.open in a startup script is that it will be blocked by a popup blocker

Re: Can you open a new window from a post back?

08-07-2008, 10:30 AM

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tirumal
Member since 08-07-2008, 2:02 PM
Posts 3

To open a window from Parent window and to close a child window(Pagetobeopend.html), you can use following code

<body onload="javascript: window.open('pagetobeopened.html','','');window.opener=''; window.close();">
<a href="javascript: window.open("pagetobeopened.html");window.opener=''; window.close();">Close Main Window without Confirmation</a>

search engine optimization

Re: Can you open a new window from a post back?

06-13-2009, 8:48 AM

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Trelane-
Member since 06-13-2009, 12:45 PM
Posts 1

Top Marks, absolutly perfectly correct:

this.myimagebutton.Attributes.Add("onClick", "this.form.target='_blank'"); //opens new window from image button and casues postback

(C# equivilent)

Mike
N-Dimensional Ltd
http://www.spyderhosting.co.uk

Re: Can you open a new window from a post back?

08-11-2009, 1:24 AM

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128 point Member
dhinakaranpc
Member since 07-14-2009, 5:04 AM
Posts 31

We can call the javascript function in the body tag which is called every time when the page loads.

function OpenPopupWindow()
{

window.open('../HelpDocs/AdmStudCenterwiseRpt.html','HelpDoc','width=600,resizable=yes,scrollbars = yes');

}

</script>
</head>

<body onload="OpenPopupWindow()">

</body>
</html>

Re: Can you open a new window from a post back?

08-11-2009, 7:43 AM

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863 point Participant
nitindhiman
Member since 12-27-2007, 4:41 PM
chandigarh, india
Posts 144

Hi PLBlum,

I rarely need such kind of functionality but it is a gud topic, I agree with you that on each n every request the browser gets a new HTML based on the request made by that because HTTP is a stateless protocol n can not mentain the state.

And as you are saying that we can use registerClientstartUpScript to regester a script while page is loading, I hv 2 question for you, can't we perform the same functionality on onLoad event of the window, Like:

window.onload = function()

{

alert('hello');

}

and 2nd 1 is wt is the difference between registerclientstartUpScript and Response.Write.

Thnx...

Nitin Dhiman....!!!!
Please Mark Answer If Helped....!!!!