Error: PageMethods function not recognized on ASPX page

As I review some older code, I can only assume that it worked at some point in time.

MyPage.aspx:

function GetCompanyList(officeId) {
    var companyList = document.getElementById('<%= CompanyDropDown.ClientID %>');
    if (companyList.length == 0)
        PageMethods.GetCompanyList(officeId, OnGetCompanyList);
    else
        EditCompany();
}

Also:

<asp:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods="true" />

Code behind:

[System.Web.Services.WebMethod()]
[System.Web.Script.Services.ScriptMethod()]
public IEnumerable<CompanyMinimum> GetCompanyList(int officeId) {
    return (
        from c in Repository.Query<Company>()
        where !c.IsDeleted && c.TypeEnumIndex == (short)CompanyRelationshipType.Hotel
        select new CompanyMinimum() {
            id = c.Id,
            desc = c.Description
        }
    ).ToList();
}

However, when the PageMethods.GetCompanyList() is called in the first code snippet, Chrome now shows an error:

PageMethods is not defined

Is there anyone who can identify what has changed causing this functionality to no longer work?

Note: I have seen similar inquiries, but they mostly pertain to this code not functioning within master pages or user controls, which is not the scenario here.

Answer №1

EnablePageMethods functions by connecting with methods of a Page derived class that meet the criteria of being public, static, and marked as a WebMethod.

GetCompanyList fulfills 2 of these requirements and only needs to be marked as static.

[System.Web.Services.WebMethod()]
[System.Web.Script.Services.ScriptMethod()]
public static IEnumerable<CompanyMinimum> GetCompanyList(int officeId) {
    // ...
}

It seems that if there are no methods that meet all 3 criteria, PageMethods may not be defined on the client-side.

Answer №2

To utilize ASP.NET AJAX Page Methods with jQuery, follow this example:

$.ajax({
    type: "POST",
    url: "PageName.aspx/MethodName",
    data: "{}",
    contentType: "application/json; charset=utf-8",
    dataType: "json",
    success: function(response) {
        // Implement your logic here.
    }
});

Answer №3

Are you currently implementing Routing on your webpage? If so, make sure to specify the correct path after invoking PageMethods:

PageMethods.set_path("<%=ResolveUrl("~/YourPage.aspx")%>");
PageMethods.YourMethod(parameter, OnSuccess, OnError);

Answer №4

Another helpful suggestion to consider is creating an empty MyPage.aspx placeholder file if you encounter this error specifically on your server and not locally. Implementing this solution could potentially resolve the issue and allow the functionality to also work on the production server.

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