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Item Type: NewsGroup Date Entered: 3/11/2004 7:26:54 AM Date Modified: Subscribers: 0 Subscribe Alert
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phobosjr
Asp.Net User
How do you capture HTML output of an aspx page or server control?3/11/2004 7:26:54 AM

0/0

This is probably a really simple question to answer but here it is: How do you capture the HTML output of a server control before it is outputted to the page? In fact how do you capture the HTML that an aspx page outputs before it is written to the page?

The only way I can think of doing this is to inherit from the System.Web.UI.HtmlTextWriter class that is used by the page and then over ride virtually every write method in that class. Now in the overridden methods I can save the in coming string to a file? as you can see it is getting very complicated and I know that there is a better way ?

For those interested here is some code showing how to use a custom HtmlTextWriter:

using System;
using System.IO;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace CustomControls
{
public class MyPage : Page
{
protected override HtmlTextWriter CreateHtmlTextWriter(TextWriter writer)
{
return new MyHtmlTextWriter(writer);
}
}


public class MyHtmlTextWriter: HtmlTextWriter
{
private TextWriter writer;
public MyHtmlTextWriter(TextWriter writer): base(writer)
{
this.writer = writer;
}

public MyHtmlTextWriter(TextWriter writer, string tabString): base(writer, tabString)
{
this.writer = writer;
}

public override void RenderBeginTag(HtmlTextWriterTag tagKey)
{
base.RenderBeginTag(tagKey);
}
}

}

The code above was taken from the .NET Framework Class Library,
HtmlTextWriter Constructor [C#]
joteke
Asp.Net User
Re: How do you capture HTML output of an aspx page or server control?3/11/2004 8:43:50 AM

0/0

Hi,

basically Page does not like that its RenderControl is called more than once (that is managed internally in its OnFormRender render method). But you can get over it something like this: 



System.IO.StringWriter swriter=new System.IO.StringWriter();


HtmlTextWriter hwriter=new HtmlTextWriter(swriter);


Page.RenderControl(hwriter);


 


//As an example write the HTML out


Response.Write(Server.HtmlEncode(swriter.ToString()));


swriter.Close();


Then just override Page's own Render method to prevent duplicate rendering (its not really an issue, but prevented internally by the Page as part of preventing duplicate server-side forms) 


protected override void Render(HtmlTextWriter writer)


{


	//Dummy method to prevent page from being normally rendered


}


With only controls this should be easier.
Thanks,

Teemu Keiski
Finland, EU
phobosjr
Asp.Net User
Re: How do you capture HTML output of an aspx page or server control?3/18/2004 6:54:10 AM

0/0



Thanks for the help Joteke

The code that you gave works fine ? but you have to iterate through the controls like such:

for( int i=0; i<Page.Controls.Count; i++)
{
Page.Controls[i].RenderControl(hwriter);

}

This solution however only outputs HTML for down level browsers. I wanted to use some of the Java Script that was generated. I tried setting the browser version to Internet Explorer 5.5 but the html still remained the same (I could not find the option that would have explicitly set Java Script to ?ON?)! Is there any way to make the page believe that it is rendering to an Internet Explorer browser that is Java Script enabled?

Thanks in advance?

3 Items, 1 Pages 1 |< << Go >> >|


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