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.NET Forum / ASP.NET / General / December 2007How to extend control to add custom html tag ?
Hi group, the aspx statement : <asp:TextBox ID="testTB" runat="server" Text="My test" /> generate html : <input name="testTB" type="text" value="My test" id="testTB" /> Imagine I want to create a custom web control, extending the TextBox control to add a custom hidden value. Something like : <MyNamespace:MyTextBox ID="testTB" runat="server" Text="My test" HiddenValue="a value" /> that can generate such html code : <input name="testTB" type="text" value="My test" id="testTB" /> <input name="hid_testTB" type="hidden" value="a value" id="hid_testTB" /> How can I render such html code ? (without having to rewritte all using writer.WriteBeginTag , and other writer.WriteAttribute) Something like protected override void ?? (...) { RenderTheBaseControl(); RenderTheAddedHiddenField(); } How can I do ? Thanks in advance for your help. S. > How can I render such html code? http://msdn2.microsoft.com/en-us/library/ms228301(VS.80).aspx  SignatureMark Rae ASP.NET MVP http://www.markrae.net I want my own custom control to be able to add both TextBox control and HiddenField, not adding 2 control in my page. This is an example, maybe later I would like to do something different, but I would like to understand how I can override the render by adding html code > <timor.su...@gmail.com> wrote in message > [quoted text clipped - 7 lines] > Mark Rae > ASP.NET MVPhttp://www.markrae.net On 18 déc, 11:53, "Mark Rae [MVP]" <m...@markNOSPAMrae.net> wrote: > <timor.su...@gmail.com> wrote in message > [quoted text clipped - 6 lines] > I want my own custom control to be able to add both TextBox control > and HiddenField, not adding 2 control in my page. Apologies, but I don't understand what the problem is... You can have as many controls as you like in your UserControl - see examples here: http://www.15seconds.com/issue/020319.htm If you want to create a UserControl which has a TextBox and a HiddenField, then create a UserControl with a TextBox and a HiddenField - when you add it to your page and set the various properties, it will render the HTML you want... SignatureMark Rae ASP.NET MVP http://www.markrae.net Thanks for your answer, but I don't want to use UserControl because I need some specific uses, such as RaiseCallbackEvent. That's why I was thinking of a custom webcontrols, inheriting from TextBox And somewhere in a render method, render the TextBox and render the HiddenField, but I don't know how You see ? > <timor.su...@gmail.com> wrote in message > [quoted text clipped - 26 lines] > Mark Rae > ASP.NET MVPhttp://www.markrae.net > Thanks for your answer, but I don't want to use UserControl because I > need some specific uses, such as RaiseCallbackEvent. [quoted text clipped - 4 lines] > > You see ? No, I'm afraid I don't... There's nothing preventing you from using RaiseCallbackEvent in a UserControl - here's an example of how to do it with a UserControl which contains two ListBox controls: http://www.c-sharpcorner.com/UploadFile/LivMic/Callback_ListBoxesFT_111212006084 429AM/Callback_ListBoxesFT_1.aspx SignatureMark Rae ASP.NET MVP http://www.markrae.net Thanks both for your help, The Peter's solution helps me to understand that it's very simple to play with writer. Mark's solution help me reconsidering what I want. I think I will find what I want Thanks for your help. Best regards, > <timor.su...@gmail.com> wrote in message > [quoted text clipped - 16 lines] > Mark Rae > ASP.NET MVPhttp://www.markrae.net Hello Timor Iam not sure wether i understood or not ;-) Its possible to do something like: protected override Render(object sender, HtmlTextWriter writer) { // Render the TextBox (Base Control) base.Render(writer); // Render the HiddenField this.RenderMyHiddenField(writer); } protected void RenderMyHiddenField(HtmlTextWriter writer) { // Render.... } In your new methode, you can render the hiddenfield using the "writer" object. SignatureGruss, Peter Bucher Microsoft MVP - Visual Developer ASP / ASP.NET, Switzerland http://www.aspnetzone.de/ - ASP.NET Zone, die ASP.NET Community http://www.aspnetzone.de/blogs/peterbucher/ - Auf den Spuren von .NET It isn't really clear from your post what the goal is, but it's very easy to add attributes to any ASP.NET control: this: protected void Page_Load(object sender, EventArgs e) { this.TextBox1.Attributes.Add("hiddenField", "blahblah"); } would render like this: <input name="TextBox1" type="text" id="TextBox1" hiddenField="blahblah" /> --Peter Site: http://www.eggheadcafe.com UnBlog: http://petesbloggerama.blogspot.com MetaFinder: http://www.blogmetafinder.com > Hi group, > [quoted text clipped - 31 lines] > > S.
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