Web Forms

Re: dropdownlist breaks xhtml validation

Rossoneri — Fri, 09 Feb 2007 17:37:25 GMT

Glad it worked for you. Don't forget to mark the post that answered your question.

Valencia is my second favorite team! I hope they embarrass Inter

Re: dropdownlist breaks xhtml validation

elwise — Fri, 09 Feb 2007 17:25:05 GMT

Thanks man, that worked perfectly!

now let's hope valencia beats inter next week in the champions league!

Re: dropdownlist breaks xhtml validation

Rossoneri — Fri, 09 Feb 2007 16:43:04 GMT

To answer your question... you do not have to pass it an HtmlTextWriter. .NET does that internally.

Re: dropdownlist breaks xhtml validation

Rossoneri — Fri, 09 Feb 2007 16:39:36 GMT

You create a new class, call it XHtmlPage for example You set it up like

public class XHtmlPage : System.Web.UI.Page
{
// Paste the Render function above in here... public override void Render
// You can rename the variables as you wish - Reflector gives them generic names as you see above
}

That's it. You will have to add some namespaces to the top of this class or qualify the StringWriter and HtmlTextWriter with their appropriate namespaces

I also noticed that in the function above, xHtml was declared as a private variable so you can either do that as well or add string xHtml = string.Empty at the top of the Render method

Then when you setup a Page like Default.aspx, when you view the codebehind you see the class has

_Default : System.Web.UI.Page

You change it to

_Default : XHtmlPage

And of course if the class you created has a different namespace, then you will have to bring that it as well with a using statement at the top or qualifying it. Does this make sense?

Re: dropdownlist breaks xhtml validation

elwise — Fri, 09 Feb 2007 16:22:59 GMT

cool thanks!

so how does it work?

I need to paste this method in my page and then call it from pageload?

also, it also looks like the method is specting HtmlTextWriter ?

Re: dropdownlist breaks xhtml validation

Rossoneri — Fri, 09 Feb 2007 16:05:13 GMT

I remember fighting this back in the day. We ended up creating a class that inherited from System.Web.UI.Page, then override the Render Method. Then had our aspx pages inherit from this class

I don't have the original source for this, but I reflected and here is what was in there

protected override void Render(HtmlTextWriter output)
{
      StringWriter writer1 = new StringWriter();
      HtmlTextWriter writer2 = new HtmlTextWriter(writer1);
      base.Render(writer2);
      writer2.Close();
      this.xHtml = writer1.GetStringBuilder().ToString();
      this.xHtml = this.xHtml.Replace("<script language=\"javascript\">", "<script type=\"text/javascript\">");
      this.xHtml = this.xHtml.Replace("<script language=\"javascript\" type=\"text/javascript\">", "<script type=\"text/javascript\">");
      this.xHtml = this.xHtml.Replace("language=\"javascript\"", string.Empty);
      output.Write(this.xHtml);
}

Re: dropdownlist breaks xhtml validation

elwise — Fri, 09 Feb 2007 15:55:02 GMT

thanks, that was a good idea.

I tried that, but it only accepts 1 attribute, so I tried:

dropArchive.Attributes.Remove("javascript");
dropArchive.Attributes.Remove("language");
dropArchive.Attributes.Remove("language=\"javascript\"");

and even

dropArchive.Attributes.Clear();

but it didn't do anything.

any other ideas?

Re: dropdownlist breaks xhtml validation

bpag — Fri, 09 Feb 2007 15:39:46 GMT

If you take off the autopostback='true' then ASP.Net won't add the onchange='..' to the dropdown but it also won't postback when you change the value so you'd then have to add the javascript your self to do the postback, which seems a little odd just to pass xhtml validation.

Re: dropdownlist breaks xhtml validation

tfsmag — Fri, 09 Feb 2007 15:29:27 GMT

have you tried doing something like

droparchive.attributes.remove("language","javascript")

in the page_load or page_init event in your codebehind?

dropdownlist breaks xhtml validation

elwise — Fri, 09 Feb 2007 15:09:51 GMT

Hi,

I have this dropdownlist that breaks xhtml w3c validation because it generates a select tag with a javascript property. this only happens when autopostback is set to true.

so the the validation error that i get is this:

Error Line 263 column 86: there is no attribute "language".

...PostBack('dropArchive','')" language="javascript" id="dropArchive">

this is the code.

this control:

<asp:dropdownlist id="dropArchive" runat="server" AutoPostBack="True"></asp:dropdownlist>

generates this html:

<select name="dropArchive" onchange="__doPostBack('dropArchive','')"
language="javascript" id="dropArchive">
<option value="1">Episode 1</option>
<option value="2">Episode 2</option>
<option selected="selected" value="3">Episode 3</option>
</select>

any idea on how can i stop the dropdownlist to generate the language="javascript" bit?

would the dropdown work without it? (I guess so?)

Thanks!