Re: DoPostBack mthod call not inserted into html when override Render

From: Zuel (zuelsjunkbox_at_yahoo.com)
Date: 01/07/05 

Date: 7 Jan 2005 12:00:11 -0800

Oh dear. Your correct. You see. My problem is that the events in the
controls are not being called when I click a button. I thought this
was due to the DoPostBack function.. :)

Sometimes one makes an assumption. Ok.. I thought it was the fact
that I was overriding the Render method that I was not getting the
events properly. In fact it's probably a lil' deeper than that.

Thanks..

No if I can figure out why the event handler is not calling the proper
event when the button is clicked I would be set!

Erik

bruce barker wrote:
> asp:buttons do not use __doPostBack as they are rendered as submit
buttons,
> so the browser will do the submit.
>
> note: if you want your site to work with javascript disabled,
asp:buttons
> are the only postback control you should use.
>
> -- bruce (sqlwork.com)
>
>
> "Zuel" <zuelsjunkbox@yahoo.com> wrote in message
> news:1105083541.114942.258120@f14g2000cwb.googlegroups.com...
> | Hi Folks.
> | So I have a small problem. My DoPostBack function is not writen to
> | the HTML page nor are the asp:buttons calling the DoPostBack.
> |
> | My Goal is to create a totaly dynamic web page where the server
> | generates the HTML based on a passed in parameter. In our case,
> | CustomerID. Every Customer ges a branded website with there logos
and
> | webpage etc.. To Avoid having 1 ASP.Net application running for
each
> | client I am attempting a more dynamic rout.
> |
> | To do this I need to be able to get the Branding stuff and inject
it
> | into the webpage.
> |
> | This is accomplished with various controls.
> |
> | the .aspx is suposed to generate the clients branded web page.
This
> | usually contains some logos and borders. So it's basically a table
> | with background images.
> |
> | Then in this table I have a .ascx user control. It's job is to
> | dynamically insert the client selected controls. The client is
able to
> | choose the layout and what controls to place on the page. So this
> | .ascx html is retrieved from the database keeping in mind it's
simply a
> | table where each cell references prefabed controls.
> |
> | The prefabed controls are created and generate like any other
control
> | and nothing further should be necessary to insert them into the
branded
> | webpage.
> |
> | So the important stuff from the default.aspx looks like this:
> |
> | <%@ Register TagPrefix="branding" TagName="MainPage"
> | Src="MainPage.ascx" %>
> | <%@ Page language="c#" Codebehind="default.aspx.cs"
> | AutoEventWireup="false" Inherits="SandBox._default" %>
> |
> | <form id="branding" method="post" runat="server">
> | <branding:MainPage id="ETranWebPage"
> | runat="server"></etran:MainPage>
> | </form>
> |
> |
> | The Mainpage control is the .ascx from above and it's html content
is
> | retrieved from a database call based on Client and looks something
like
> | this.
> |
> |
> | <Table>
> | <TR><TD>formatted HTML</TD></TR>
> | <TR><TD>
> | <control1 runat="server">
> | <Properties>
> | <Property
> | name="buttonText">login</Property>
> | </Properties>
> | </control1>
> | </TD></TR>
> | <TR><TD>Some extra stuff</TD></TR>
> | </table>
> |
> | The MainPage control overrides Render. In Render it parses the
XHTML
> | above and dynamically inserts the correct control.
> |
> | This information is also retrieved from an XML file and stored in a
> | hashtable. Key=id. Notice the id value matches the above xhtml's
> | element.
> |
> | <Control source="testControl1.ascx" id="control1"
> | className="SandBox.testControl1"/>
> |
> | Since I cannot simplifiy this too much.. Here is the code behind
the
> | render.
> |
> | private void Render(XmlNode node, HtmlTextWriter output) {
> | IEnumerator iEnum;
> | IEnumerator nl =
> | ((XmlNode)node).ChildNodes.GetEnumerator();
> | if(nl.MoveNext()==false) {
> | output.Write(node.Value);
> | }else{
> | do {
> | XmlNode n = (XmlNode)nl.Current;
> | if(n.GetType() == typeof(XmlElement)) {
> | XmlElement e = (XmlElement)n;
> | if(mPageControls.ContainsKey(e.Name)) {
> | this.RenderETranControl(e,output);
> | }else {
> |
> |
> | if(n.ChildNodes.GetEnumerator().MoveNext()==false) {
> | output.Write(node.Value);
> | }else{
> |
> | output.Write(n.OuterXml.Substring(0,n.OuterXml.IndexOf(">")+1));
> | this.Render(n,output);
> | output.Write("</");
> | output.Write(n.Name);
> | output.Write(">");
> | }
> | }
> | }else {
> | this.Render(n,output);
> | }
> | }while(nl.MoveNext());
> | }
> | }
> |
> | public void RenderETranControl(XmlElement e, HtmlTextWriter
> | output) {
> | IEnumerator iEnum;
> |
> | ETranWebControl control =
> | (ETranWebControl)mPageControls[e.Name];
> | Control c = (Control)LoadControl(control.source);
> | c.ID = control.id;
> | XmlAttributeCollection attributes = e.Attributes;
> | iEnum = attributes.GetEnumerator();
> | while(iEnum.MoveNext()) {
> | XmlAttribute attribute = (XmlAttribute)iEnum.Current;
> | }
> | iEnum =
> | e.GetElementsByTagName("Properties").GetEnumerator();
> | if(iEnum.MoveNext()) {
> | XmlElement properties = (XmlElement)iEnum.Current;
> | iEnum =
> | properties.GetElementsByTagName("Property").GetEnumerator();
> | while(iEnum.MoveNext()) {
> | XmlElement property = (XmlElement)iEnum.Current;
> | string propertyName =
> | property.GetAttribute("name");
> | string value = property.InnerText;
> | Type controlType = c.GetType();
> | try{
> | PropertyInfo pInfo =
> | controlType.GetProperty(propertyName);
> | pInfo.SetValue(c,value,null);
> | }catch(Exception ex) {
> | // Add Logging
> | }
> | }
> | }
> | // Controls.Add(c);
> | c.RenderControl(output);
> |
> | }
> |
> | Here is the control's html
> |
> |
> | <%@ Control Language="c#" AutoEventWireup="false"
> | Codebehind="testControl1.ascx.cs" Inherits="SandBox.testControl1"
> | TargetSchema="http://schemas.microsoft.com/intellisense/ie5"%>
> |
> | <asp:Button id="Button1" Text="Button" runat="server"></asp:Button>
> |
> | and here we have the html output.
> |
> | <script language="javascript" type="text/javascript">
> |
> | </HEAD>
> | <body>
> | <form name="ETran" method="post" action="default.aspx"
> | id="ETran">
> | <input type="hidden" name="__VIEWSTATE"
> | value="dDwxMDQxNzA2MzQ5Ozs+K/wXsV22klaSnVgoGGt1YT6Hl94=" />
> |
> | <Table><TR><TD>formatted HTML</TD></TR><TR><TD><input
> | type="submit" name="control1:Button1" value="login"
> | id="control1_Button1" />
> | </TD></TR><TR><TD>Some extra stuff</TD></TR></Table>
> | </form>
> | </body>
> | </HTML>
> |
> | There is no doPostBack anything in the html output.
> | If you could help out I would greatly appreciate it!
> |
> | Erik
> |