Add event handler to control

[jasonwucinski]

Hello everyone,
I am creating a web control by addin the html in the code behind, like this:

 Dim sb As New StringBuilder
        Dim myDiv As HtmlGenericControl = Me.theContainer

 sb.Append("<table width='100&#37;'  cellpadding='0' cellspacing='0' style='border:0px;'>" & vbCrLf)
        sb.Append(" <tr class='mainRow1'>" & vbCrLf)
        sb.Append("<td  align='left'  style='border:0px solid white;'>Main Menu</td>" & vbCrLf)
        sb.Append("<td>" & vbCrLf)
        sb.Append("<asp:Label ID='Label1' runat='server' Text='Label'></asp:Label>" & vbCrLf)
        sb.Append("</td>" & vbCrLf)
        sb.Append("<td  align='right' style='border:0px solid white;'>Sort By: Id | Name</td>" & vbCrLf)
        sb.Append("</tr>" & vbCrLf)
        sb.Append("</table>" & vbCrLf)

 myDiv.InnerHtml = sb.ToString

This will generate the html for the table in the codebehind then inject it into the specified DIV element. My question is, if I create a control in this manner, how do i add an event that will fire a method in my codebehind? For example, if i want to create a image button i would do it this way in the code:

           <asp:ImageButton CommandArgument='<%# (Container.DataItem.objectValue) %>'            
ID='ImageButton1' runat='server' OnCommand='Button1_Click' ImageUrl='~/images/folder.gif' />

but in the code behind i would do this:

sb.Append("<input type='image' name='ctl00$ContentPlaceHolder1$importWizard1$folderControl1$folderRepeater$ctl04$ImageButton" & myCounter & "'")
sb.Append(" id='ctl00_ContentPlaceHolder1_importWizard1_folderControl1_folderRepeater_ctl04_ImageButton" & myCounter & "'")
sb.Append(" src='images/folder.gif' style='border-width:0px;'  />" & vbCrLf)

But I cant add the OnCommand because it wont be rendered properly.

Thanks for your help
jason

[gep13]

Hey,

Have a look here:

http://msdn.microsoft.com/en-us/libr...(v=vs.71).aspx

Specifically:

http://msdn.microsoft.com/en-us/libr...(v=vs.71).aspx

Hope that helps!

Gary

[jasonwucinski]

Hi,

Thanks for the reply. I'm not sure I understand how this will help. The article seems to be for how to create a control and add it to your client side code. I want to create the html code in the codebehind and add the appropriate event.

So, if in my codeBehind i create the control like this:

Dim sb As New StringBuilder
Dim myDiv As HtmlGenericControl = Me.theContainer


sb.Append("<input type='image' name='ctl00$ContentPlaceHolder1$importWizard1$folderControl1$folderRepeater$ctl04$ImageButton" & myCounter & "'")
sb.Append(" id='ctl00_ContentPlaceHolder1_importWizard1_folderControl1_folderRepeater_ctl04_ImageButton" & myCounter & "'")
sb.Append(" src='images/folder.gif' style='border-width:0px;'  />" & vbCrLf)

 myDiv.InnerHtml = sb.ToString

how do I add the "onClick" event that will call the method. I use a loop to create these controls, so all controls will call the same methdod but pass different parameters.

Thanks for your help

jason

[rjv_rnjn]

You may want to look at __doPostBack using javascript.
This article may help: http://www.codedigest.com/Articles/A...in_AspNet.aspx

[rjv_rnjn]

Looked a bit more at your code, and seems like you may want to look at this too: http://geekswithblogs.net/mnf/archiv.../04/59081.aspx

This is for the $ sign that ASP.Net puts in control names and you have that in the string you are building.

[brin351]

Is there a reason why you can NOT create the controls dynamically in code?

Rendering them in a html string seems like bad practice to me.

[gep13]

Rendering them in a html string seems like bad practice to me.

This is pretty much what all the ASP.NET Server Controls do behind the scenes though.

Gary

[brin351]

This is pretty much what all the ASP.NET Server Controls do behind the scenes though.

Gary

True but this is before the render event, you can't make a refrence to the controls in code and seems counter intuative. I asked why do this because there must be a better way to achive the same result.