Create an asp server control dynamically in an html string, which is then inserted in an aspx

Question

I am on the server side of an asp.net application. There I have some html source code in a variable called 'HtmlText'. This source code is generated from xml via a xsl transformation, and is resulting in something like this:

<h1>ABC Test KH</h1>
<!--place for the control-->
<table class="tablesorter" id="tablesorter183">
<thead>
<tr>
    <th align="left">Name</th>
    <th align="right">DB</th>
    <th align="right">DB Anteil in Prozent</th>
    <th align="right">ABC</th>
</tr>
</thead>
<tbody>
<tr>
    <td align="left" fieldName="Name">Fabrikam, Inc.</td>
    <td align="right" fieldName="DB">881.378,00 €</td>
    <td align="right" fieldName="DB_Anteil_in_Prozent">29,92</td>
    <td align="right" fieldName="ABC">A</td>
</tr>
</tbody>
</table>

Now this source code is inserted in a aspx-website via the InnerHtml-property. There is a div with id 'book' in that aspx:

book.InnerHtml = HtmlText

This works fine so far.

But now I want to create a dropdown-control in that html, which I can access on server-side. This control should be placed between the h1 and table-tags, where the comment  is located.

I know how to create asp-control dynamically and bind an event to that, but this works only if I have the aspx in the first place. I cannot do that to some html-source which exists just in a string at that time.

Is there any way to do what I want, or am I on the wrong track here?

Thanks in advance for any suggestions.

Kind regards, Kai

Because I got an xml from a database. Then I use several xsl-transformations to get the desired result, first as a xml, and in the last step (the one described) to produce html. — Kai Hartmann
– Kai Hartmann, Commented Nov 22, 2012 at 10:42

Community · Accepted Answer · 2017-05-23 12:12:22Z

1

I think the only solution is to create a control that inherits DropDownList, and override its RenderControl method.

Something like this:

public override void RenderControl(HtmlTextWriter writer)
{
      //...
      //Fill in the variable HtmlText content
      //Split it to 2 variables - before and after the control place, and:

      writer.Write(startString);
      base.RenderControl(writer);
      writer.Write(endString);
}

And use this control instead of DropDownList.

EDIT: In a case of several controls, I would use the way suggested here: Render .net controls to string and get events to fire:

Split the string to several strings - the first string - from the beginning to the first control, second string - from the first control to the second control, and so on.

And then insert each of the strings to a new LiteralControl, and add them to the page Like this:

book.Controls.Add(LiteralControl1);
book.Controls.Add(DropDownList1);
book.Controls.Add(LiteralControl2);
book.Controls.Add(Button1);

edited May 23, 2017 at 12:12

CommunityBot

11 silver badge

answered Nov 22, 2012 at 12:14

banana

1,1564 gold badges15 silver badges27 bronze badges

Sign up to request clarification or add additional context in comments.

7 Comments

Kai Hartmann Over a year ago

So basically you insert all the generated html-code as part of the dropdown-control?

banana Over a year ago

Yes, but I do not think it has any undesirable effect.

Kai Hartmann Over a year ago

Hm... It prevents me from adding more than one DropDown, doesn't it? Because also the html-Code doubles, if I add another one...

banana Over a year ago

You can add this control once, and other times a standard DropDownList control.

banana Over a year ago

Yes, you're right, this solution is not suitable in case of several controls. In this case I think this question can help you.

|

Collectives™ on Stack Overflow

Create an asp server control dynamically in an html string, which is then inserted in an aspx

1 Answer 1

7 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

7 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related