ClientScriptManager.RegisterHiddenField Method (String, String)
.NET Framework (current version)
Registers a hidden value with the Page object.
Assembly: System.Web (in System.Web.dll)
Public Sub RegisterHiddenField ( hiddenFieldName As String, hiddenFieldInitialValue As String )
Parameters
- hiddenFieldName
-
Type:
System.String
The name of the hidden field to register.
- hiddenFieldInitialValue
-
Type:
System.String
The initial value of the field to register.
| Exception | Condition |
|---|---|
| ArgumentNullException | hiddenFieldName is null. |
The RegisterHiddenField method creates a hidden <input> element on the rendered HTML page.
The following code example demonstrates the use of the RegisterArrayDeclaration and RegisterHiddenField methods. The example registers an array and a hidden value and defines the OnClick event of an <input> button to calculate the sum of two values of the array and the hidden value.
<%@ Page Language="VB" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server"> Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) ' Define the array name and values. Dim arrName As String = "MyArray" Dim arrValue As String = """1"", ""2"", ""text""" ' Define the hidden field name and initial value. Dim hiddenName As String = "MyHiddenField" Dim hiddenValue As String = "3" ' Define script name and type. Dim csname As String = "ConcatScript" Dim cstype As Type = Me.GetType() ' Get a ClientScriptManager reference from the Page class. Dim cs As ClientScriptManager = Page.ClientScript ' Register the array with the Page class. cs.RegisterArrayDeclaration(arrName, arrValue) ' Register the hidden field with the Page class. cs.RegisterHiddenField(hiddenName, hiddenValue) ' Check to see if the script is already registered. If (Not cs.IsClientScriptBlockRegistered(cstype, csname)) Then Dim cstext As StringBuilder = New StringBuilder() cstext.Append("<script type=""text/javascript\""> function DoClick() {") cstext.Append("Form1.Message.value='Sum = ' + ") cstext.Append("(parseInt(" + arrName + "[0])+") cstext.Append("parseInt(" + arrName + "[1])+") cstext.Append("parseInt(" + Form1.Name + "." + hiddenName + ".value));} </") cstext.Append("script>") cs.RegisterClientScriptBlock(cstype, csname, cstext.ToString(), False) End If End Sub </script> <html xmlns="http://www.w3.org/1999/xhtml" > <head> <title>ClientScriptManager Example</title> </head> <body> <form id="Form1" runat="server"> <input type="text" id="Message" /> <input type="button" onclick="DoClick()" value="Run Script" /> </form> </body> </html>
.NET Framework
Available since 2.0
Available since 2.0
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