HtmlInputButton.RenderAttributes(HtmlTextWriter) Method

Reference

Definition

Namespace:: System.Web.UI.HtmlControls

Assembly:: System.Web.dll

Important

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Renders the attributes into the specified writer and then calls the RenderAttributes(HtmlTextWriter) method.

protected:
 override void RenderAttributes(System::Web::UI::HtmlTextWriter ^ writer);

protected override void RenderAttributes (System.Web.UI.HtmlTextWriter writer);

override this.RenderAttributes : System.Web.UI.HtmlTextWriter -> unit

Protected Overrides Sub RenderAttributes (writer As HtmlTextWriter)

Parameters

writer: HtmlTextWriter

An HtmlTextWriter that receives the rendered content.

Examples

The following code example demonstrates how to override the OnPreRender method in a custom server control so that specific title text, accessible as a ToolTip, is always displayed for the HtmlInputButton.

<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.CS.Controls" Assembly="Samples.AspNet.CS" %>
<%@ Page Language="C#" AutoEventWireup="True" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
  <head>
    <title>Custom HtmlInputButton - RenderAttributes - C# Example</title>
    <script runat="server">
      void Page_Load(Object sender, EventArgs e)
      {
        HtmlInputButton1.Attributes.Add("onclick","alert('Hello client-side world.');");
      }

      void HtmlInputButton1_ServerClick(Object sender, EventArgs e)
      {
        Div1.InnerHtml = "Hello server-side world.";
      }
    </script>
  </head>
  <body>
    <form id="Form1" method="post" runat="server">
      <h3>Custom HtmlInputButton - RenderAttributes - C# Example</h3>

      <aspSample:CustomHtmlInputButtonRenderAttributes
        id="HtmlInputButton1"
        runat="server"
        type="button"
        onserverclick="HtmlInputButton1_ServerClick"
        value="Html Input Button"
        name="HtmlInputButton1">  

      <div id="Div1" runat="server"
        style="DISPLAY: inline; WIDTH: 256px; HEIGHT: 15px" />
    </form>
  </body>
</html>

<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.VB.Controls" Assembly="Samples.AspNet.VB" %>
<%@ Page Language="VB" AutoEventWireup="True" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
  <head>
    <title>Custom HtmlInputButton - RenderAttributes - Visual Basic Example</title>
    <script runat="server">
      Sub Page_Load(sender As Object, e As EventArgs)
        HtmlInputButton1.Attributes.Add("onclick", "alert('Hello client-side world.');")
      End Sub

      Sub HtmlInputButton1_ServerClick(sender As Object, e As EventArgs)
        Div1.InnerHtml = "Hello server-side world."
      End Sub
    </script>
  </head>
  <body>
    <form id="Form1" method="post" runat="server">
      <h3>Custom HtmlInputButton - RenderAttributes - Visual Basic Example</h3>

      <aspSample:CustomHtmlInputButtonRenderAttributes
        id="HtmlInputButton1"
        runat="server"
        type="button"
        onserverclick="HtmlInputButton1_ServerClick"
        value="Html Input Button"
        name="HtmlInputButton1">  

      <div id="Div1" runat="server"
        style="DISPLAY: inline; WIDTH: 256px; HEIGHT: 15px" />
    </form>
  </body>
</html>

using System.Web;
using System.Security.Permissions;

namespace Samples.AspNet.CS.Controls
{
    [AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)]
    public sealed class CustomHtmlInputButtonRenderAttributes : System.Web.UI.HtmlControls.HtmlInputButton
    {
        protected override void RenderAttributes(System.Web.UI.HtmlTextWriter writer)
        {

            // Call the base class's RenderAttributes method.
            base.RenderAttributes(writer);

            // Write out the HtmlInputButton control's Title tag.
            writer.Write(" Title=\"Text from RenderAttributes.\"");
        }
    }
}

Imports System.Web
Imports System.Security.Permissions

Namespace Samples.AspNet.VB.Controls
    <AspNetHostingPermission(SecurityAction.Demand, Level:=AspNetHostingPermissionLevel.Minimal)> _
    Public NotInheritable Class CustomHtmlInputButtonRenderAttributes
        Inherits System.Web.UI.HtmlControls.HtmlInputButton

        Protected Overrides Sub RenderAttributes(ByVal writer As System.Web.UI.HtmlTextWriter)

            ' Call the base class's RenderAttributes method.
            MyBase.RenderAttributes(writer)

            ' Write out the HtmlInputButton control's Title tag.
            writer.Write(" Title=""Text from RenderAttributes.""")
        End Sub
    End Class

End Namespace

Remarks

The RenderAttributes method overrides the base HtmlControl.RenderAttributes.method. RenderAttributes is used primarily by control developers.

Applies to

共用方式為