Page.RegisterHiddenField Method
NOTE: This method is now obsolete.
Allows server controls to automatically register a hidden field on the form. The field will be sent to the Page object when the HtmlForm server control is rendered. Namespace: System.Web.UIAssembly: System.Web (in system.web.dll)
'Declaration <ObsoleteAttribute("The recommended alternative is ClientScript.RegisterHiddenField(string hiddenFieldName, string hiddenFieldInitialValue). http://go.microsoft.com/fwlink/?linkid=14202")> _ Public Overridable Sub RegisterHiddenField ( _ hiddenFieldName As String, _ hiddenFieldInitialValue As String _ ) 'Usage Dim instance As Page Dim hiddenFieldName As String Dim hiddenFieldInitialValue As String instance.RegisterHiddenField(hiddenFieldName, hiddenFieldInitialValue)
/** @attribute ObsoleteAttribute("The recommended alternative is ClientScript.RegisterHiddenField(string hiddenFieldName, string hiddenFieldInitialValue). http://go.microsoft.com/fwlink/?linkid=14202") */
public void RegisterHiddenField (
String hiddenFieldName,
String hiddenFieldInitialValue
)
ObsoleteAttribute("The recommended alternative is ClientScript.RegisterHiddenField(string hiddenFieldName, string hiddenFieldInitialValue). http://go.microsoft.com/fwlink/?linkid=14202") public function RegisterHiddenField ( hiddenFieldName : String, hiddenFieldInitialValue : String )
Not applicable.
Parameters
- hiddenFieldName
The unique name of the hidden field to be rendered.
- hiddenFieldInitialValue
The value to be emitted in the hidden form.
The RegisterHiddenField method has been deprecated. Use the RegisterHiddenField method in the ClientScriptManager class.
The following code example uses the RegisterHiddenField method to help create ECMAScript code that is passed to the requesting browser. The name of the hidden field is set to myHiddenField and its value is set to "Welcome to Microsoft!" The RegisterStartupScript method calls the myHiddenField value when the user clicks a button on the page.
Security Note: |
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This example has a hidden field, which is a potential security threat. By default, you should validate the value of a hidden field as you would the value of a text box. ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see Script Exploits Overview (Visual Studio). |
Dim scriptString As String = "<script language=""JavaScript""> function doClick() {"
scriptString += "document.write('<h4>' + myForm.myHiddenField.value+ '</h4>');}<"
scriptString += "/" + "script>"
RegisterHiddenField("myHiddenField", "Welcome to Microsoft!")
RegisterOnSubmitStatement("submit", "document.write('<h4>Submit button clicked.</h4>')")
RegisterStartupScript("startup", scriptString)
void Page_Load(Object sender, EventArgs e)
{
String scriptString
= "<script language=\"JavaScript\"> function doClick() {";
scriptString
+= "document.write('<h4>' + myForm.myHiddenField.value+ '</h4>');}<";
scriptString += "/" + "script>";
RegisterHiddenField("myHiddenField", "Welcome to Microsoft!");
RegisterOnSubmitStatement("submit",
"document.write('<h4>Submit button clicked.</h4>')");
RegisterStartupScript("startup", scriptString);
} //Page_Load
Security Note: