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I just found the answer and it works :)
You need to add the following to your server side link/button:
OnClientClick="aspnetForm.target ='_blank';"
My entire button code looks something like:
<asp:LinkButton ID="myButton" runat="server" Text="Click Me!"
OnClick="myButton_Click"
OnClientClick="aspnetForm.target ='_blank';"/>
In the server side OnClick I do a Response.Redirect("MyPage.aspx"); and the page is opened in a new window.
The other part you need to add is to fix the form's target otherwise every link will open in a new window. To do so add the following in the header of your POPUP window.
<script type="text/javascript">
function fixform() {
if (opener.document.getElementById("aspnetForm").target != "_blank") return;
opener.document.getElementById("aspnetForm").target = "";
opener.document.getElementById("aspnetForm").action = opener.location.href;
}
</script>
and
<body onload="fixform()">
You can use this as extension method
public static class ResponseHelper
{
public static void Redirect(this HttpResponse response, string url, string target, string windowFeatures)
{
if ((String.IsNullOrEmpty(target) || target.Equals("_self", StringComparison.OrdinalIgnoreCase)) && String.IsNullOrEmpty(windowFeatures))
{
response.Redirect(url);
}
else
{
Page page = (Page)HttpContext.Current.Handler;
if (page == null)
{
throw new InvalidOperationException("Cannot redirect to new window outside Page context.");
}
url = page.ResolveClientUrl(url);
string script;
if (!String.IsNullOrEmpty(windowFeatures))
{
script = @"window.open(""{0}"", ""{1}"", ""{2}"");";
}
else
{
script = @"window.open(""{0}"", ""{1}"");";
}
script = String.Format(script, url, target, windowFeatures);
ScriptManager.RegisterStartupScript(page, typeof(Page), "Redirect", script, true);
}
}
}
With this you get nice override on the actual Response object
Response.Redirect(redirectURL, "_blank", "menubar=0,scrollbars=1,width=780,height=900,top=10");
Contruct your url via click event handler:
string strUrl = "/some/url/path" + myvar;
Then:
ScriptManager.RegisterStartupScript(Page, Page.GetType(), "popup", "window.open('" + strUrl + "','_blank')", true);
Because Response.Redirect is initiated on the server you can't do it using that.
If you can write directly to the Response stream you could try something like:
response.write("<script>");
response.write("window.open('page.html','_blank')");
response.write("</script>");
The fixform trick is neat, but:
You may not have access to the code of what loads in the new window.
Even if you do, you are depending on the fact that it always loads, error free.
And you are depending on the fact that the user won't click another button before the other page gets a chance to load and run fixform.
I would suggest doing this instead:
OnClientClick="aspnetForm.target ='_blank';setTimeout('fixform()', 500);"
And set up fixform on the same page, looking like this:
function fixform() {
document.getElementById("aspnetForm").target = '';
}
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