asp.net ScriptManager PageMethods is undefined
I want to call static server-side methods from JS so i decide to use ScriptManager control on my site. So i have a master page, with such structure:
<%@ Master Language="C#" AutoEventWireup="true" CodeBehind="TopLevelMasterPage.Master.cs"
Inherits="Likedrive.MasterPages.TopLevelMasterPage" %>
<!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"
xmlns:fb="http://ogp.me/ns/fb#">
<head runat="server">
<title></title>
<script type="text/javascript">
function getGiftFileUrl() {
function OnSuccess(response) {
alert(response);
}
function OnError(error) {
alert(error);
}
PageMethods.GetGiftFileUrl("hero", 1024, 768, OnSuccess, OnError);
}
getGiftFileUrl();
</script>
</asp:ContentPlaceHolder>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManagerMain"
runat="server"
EnablePageMethods="true"
ScriptMode="Release"
LoadScriptsBeforeUI="true">
</asp:ScriptManager>
<asp:ContentPlaceHolder ID="MainContent" runat="server">
</asp:ContentPlaceHolder>
</form>
</body>
</html>
But when page is loading, i have a JS exception - PageMethods is undefined. I supposed that object will be created implicit so i can use it in my javascript.
Answer
To use PageMethods you need to follow these steps:
- You need to use
ScriptManagerand setEnablePageMethods. (You did). - Create a
staticmethod in your code behind and use the[WebMethod]attribute. - Call you method in javascript like you should do in C# but you have more parameter do fill, the
sucessanderrorcallbacks. (You did).
Did you miss any of these steps?
Edit: Just realized you did this:
function getGiftFileUrl() {
function OnSuccess...
You have yours callbacks inside a function. You need yours callbacks like this:
function OnSuccess(response) {
alert(response);
}
function OnError(error) {
alert(error);
}
PageMethods.GetGiftFileUrl("hero", 1024, 768, OnSuccess, OnError);
And you code behind probably will end in something like that:
[WebMethod]
public static string GetGiftFileUrl(string name, int width, int height)
{
//... work
return "the url you expected";
}
Bonus: Since it is a static method you can't use this.Session["mySessionKey"], but you can do HttpContext.Current.Session["mySessionKey"].