Page.IsStartupScriptRegistered Method
NOTE: This method is now obsolete.
Determines whether the client startup script is registered with the Page object. Namespace: System.Web.UIAssembly: System.Web (in system.web.dll)
[ObsoleteAttribute(L"The recommended alternative is ClientScript.IsStartupScriptRegistered(string key). http://go.microsoft.com/fwlink/?linkid=14202")] public: bool IsStartupScriptRegistered ( String^ key )
/** @attribute ObsoleteAttribute("The recommended alternative is ClientScript.IsStartupScriptRegistered(string key). http://go.microsoft.com/fwlink/?linkid=14202") */
public boolean IsStartupScriptRegistered (
String key
)
ObsoleteAttribute("The recommended alternative is ClientScript.IsStartupScriptRegistered(string key). http://go.microsoft.com/fwlink/?linkid=14202") public function IsStartupScriptRegistered ( key : String ) : boolean
Not applicable.
Parameters
- key
The string key of the startup script to search for.
Return Value
true if the startup script is registered; otherwise, false.Call this method before calling Page.RegisterStartupScript to avoid unnecessarily assembling the client-side script. This is particularly important if the script requires a large amount of server resources to create.
The IsStartupScriptRegistered method has been deprecated. Use the IsStartupScriptRegistered method in the ClientScriptManager class.
The following code example demonstrates the use of the RegisterStartupScript method in conjunction with the IsStartupScriptRegistered method. If the ECMAScript written in the code declaration block has not already been registered, as determined by IsStartupScriptRegistered, then a RegisterStartupScript call is made.
<!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>Welcome"
+ " to Microsoft .NET!</title>
<script language="VJ#" runat="server">
public void Page_Load(Object sender, EventArgs e)
{
if (!(this.IsStartupScriptRegistered("Startup")))
{
// Form the script to be registered at client side.
String scriptString = "<script language=\"JavaScript\"> function DoClick() {";
scriptString += "showMessage2.innerHTML='<h4>Welcome"
+ " to Microsoft .NET!</h4>'}";
scriptString += "function Page_Load(){ showMessage1.innerHTML=";
scriptString += "'<h4>RegisterStartupScript Example</h4>'}<";
scriptString += "/";
scriptString += "script>";
this.RegisterStartupScript("Startup", scriptString);
}
}
</script>
</head>
<body style="margin-top:20; margin-left:10" onload="Page_Load()">
<form id="myForm" runat="server">
<span id="showMessage1"></span>
<br />
<input type="button" value="ClickMe" onclick="DoClick()" />
<br />
<span id="showMessage2"></span>
</form>
</body>
</html>