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Page.SetFocus Method (String)

Sets the browser focus to the control with the specified identifier.

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

public void SetFocus (
	string clientID
)
public void SetFocus (
	String clientID
)
public function SetFocus (
	clientID : String
)
Not applicable.

Parameters

clientID

The ID of the control to set focus to.

Exception typeCondition

ArgumentNullException

clientID is a null reference (Nothing in Visual Basic).

InvalidOperationException

SetFocus is called when the control is not part of a Web Forms page.

- or -

SetFocus is called after the PreRender event.

Use the SetFocus method to make the control with the specified ID string the active control in the Web page displayed by the browser. The SetFocus method must be called before the page is prepared for rendering to the client in the PreRender event.

NoteNote:

The SetFocus method will work only on browsers supporting ECMAScript version 1.3 or later.

The following code example sets the focus to the second text box on a Web page.

Security noteSecurity Note:

This example has a text box that accepts user input, which is a potential security threat. By default, ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see Script Exploits Overview (Visual Studio).

<%@ page language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
    void Page_Init(object sender, EventArgs e)
    {
        SetFocus(focusHere.ClientID);
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
        <asp:textbox id="default" runat="server" /><br />
        <asp:textbox id="focusHere" runat="server" />
    </form>
</body>
</html>

Windows 98, Windows Server 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0

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