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I have a ASP.Net page with an IFrame control.
I need to make it empty from code behind.
Is it possible?

Yes, if you set the IFRAME as runat="server". You then have access to it from
codebehind, and you can set the src property.

--Peter
http://www.eggheadcafe.com
unBlog: http://petesbloggerama.blogspot.com
BlogMetaFinder: http://www.blogmetafinder.com



"Jakob Lithner" wrote:

> I have a ASP.Net page with an IFrame control.
> I need to make it empty from code behind.
> Is it possible?
>

I tried that as my first suggestion, but it didn't work.

The serverside control has no src property.
It is possible to find the HTML src attribute by the Attributes collection,
but it is always set to empty string and it makes no difference to change it.

I tried everything: InnerText, InnerHTML, DataBind, etc.

Declare a Generic control:
protected System.Web.UI.HtmlControls.HtmlGenericControl IFrame1;

Then, you need to do findcontrol to identify the control on the page and
typecast it:

HtmlControl IFrame1 = (HtmlControl)this.FindControl("IFrame1");

Now you can access the src property:

IFrame1.Attributes["src"] = http://www.live.com ;


Have fun,
--Peter
http://www.eggheadcafe.com
unBlog: http://petesbloggerama.blogspot.com
BlogMetaFinder: http://www.blogmetafinder.com



"Jakob Lithner" wrote:

> I tried that as my first suggestion, but it didn't work.
>
> The serverside control has no src property.
> It is possible to find the HTML src attribute by the Attributes collection,
> but it is always set to empty string and it makes no difference to change it.
>
> I tried everything: InnerText, InnerHTML, DataBind, etc.

"Peter Bromberg [C# MVP]" <> wrote in message
news:A5E0463F-7948-4469-950C-...
> Declare a Generic control:
> protected System.Web.UI.HtmlControls.HtmlGenericControl IFrame1;
>
> Then, you need to do findcontrol to identify the control on the page and
> typecast it:
>
> HtmlControl IFrame1 = (HtmlControl)this.FindControl("IFrame1");
>
> Now you can access the src property:
>
> IFrame1.Attributes["src"] = http://www.live.com ;


but to "clear it" I believe it should be:

IFrame1.Attributes["src"] = "about:blank";

Yes, another means is use a static black htm page and always let the iframe
point to that page whenever you want to make it display empty.

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead


This posting is provided "AS IS" with no warranties, and confers no rights.


--------------------
>From: "Barrie Wilson" <>
>Newsgroups: microsoft.public.dotnet.framework.aspnet
>Subject: Re: Clear IFRAME from code behind?
>Date: Wed, 14 Nov 2007 11:54:55 -0600
>
>"Peter Bromberg [C# MVP]" <> wrote in
message
>news:A5E0463F-7948-4469-950C-...
>> Declare a Generic control:
>> protected System.Web.UI.HtmlControls.HtmlGenericControl IFrame1;
>>
>> Then, you need to do findcontrol to identify the control on the page and
>> typecast it:
>>
>> HtmlControl IFrame1 = (HtmlControl)this.FindControl("IFrame1");
>>
>> Now you can access the src property:
>>
>> IFrame1.Attributes["src"] = http://www.live.com ;
>
>
>but to "clear it" I believe it should be:
>
>IFrame1.Attributes["src"] = "about:blank";
>
>
>

I actually did all of this correct from the beginning.
The reason I did not get the expected result was that I had a couple of AJAX
UpdatePanels and the IFRAME was not covered by the UpdatePanel that was
changed .....
Sorry for that, and thanks again for your feedback!

Previously I used an empty HTML file or did manual wiping of the result.
The "about" solution is much more elegant!
Thanks!