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AttributeCollection.Item Property

Gets or sets a specified attribute value for a server control.

Namespace:  System.Web.UI
Assembly:  System.Web (in System.Web.dll)

public string this[
	string key
] { get; set; }

Parameters

key
Type: System.String

The location of the attribute in the collection.

Property Value

Type: System.String
The attribute value.

You can add an attribute to or retrieve one from an ASP.NET server control that uses this property.

TopicLocation
How to: Read HTML Attributes for Controls in Web Forms PagesBuilding ASP .NET Web Applications
How to: Read HTML Attributes for Controls in Web Forms PagesBuilding ASP .NET Web Applications

The following example shows how to set a dynamic HTML onblur attribute to run an ECMAScript (JavaScript) command when a TextBox Web server control loses focus.

<!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 runat="server">
    <title>Attributes Property of a Web Control</title>
<script language="c#" runat="server">

       void Page_Load(Object sender, EventArgs e) {
          TextBox1.Attributes["onblur"]="javascript:alert('Hello! Focus lost from text box!!');";    
       }
   </script>

</head>
<body>
   <h3>Attributes Property of a Web Control</h3>
<form id="form1" runat="server">

   <asp:TextBox id="TextBox1" columns="54" 
    Text="Click here and then tab out of this text box" 
    runat="server"/>  

</form>
</body>
</html>
   

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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