Invoking a C# function inside a cshtml file

Question

Invoking a C# function inside a cshtml file

Having trouble calling a function in my CSHTML page.

In the script of my CSHTML page :

 <script type="text/javascript" >
        //var sLoggedInUser = <%# GetSession_LoggedInIdUser() %>;
        $(document).ready(function () {
            alert("dom");

            var sLoggedInUser = PageMethods.GetSession_LoggedInUserName();          

            alert(sLoggedInUser);
        });


        function btnClick() {
            alert("btn click");
        }

    </script>

'dom' is alerted, button click function works fine, but no value for sLoggedInUser. In my CS page:

 protected string GetSession_LoggedInUserName()
        {
            SessionConfiguration Obj_Configuration = (SessionConfiguration)Session["Configuration"];
            return Obj_Configuration.LoggedInUserName;
        }

I also tried with :

var sLoggedInUser = <%= PageMethods.GetSession_LoggedInUserName() %>

//

var sLoggedInUser = GetSession_LoggedInUserName()

javascript c#asp.net

Answer 1

Answer №1

const currentUser = PageMethods.GetSession_LoggedInUserName();

This method won't work as you can't directly call a server-side function from JavaScript.

const currentUser = <%= PageMethods.GetSession_LoggedInUserName() %>

While this is closer, it will output JavaScript like:

const currentUser = John Smith

However, this is not valid JavaScript because the string isn't enclosed in quotes. To handle special characters like apostrophes in names such as Paddy O'Brien, you should convert the string to Json using a function. If you have access to helper functions like Razor, it would look something like:

const currentUser = <%= Html.Json(PageMethods.GetSession_LoggedInUserName())%>;

Answer 2

const currentUser = PageMethods.GetSession_LoggedInUserName();

This method won't work as you can't directly call a server-side function from JavaScript.

const currentUser = <%= PageMethods.GetSession_LoggedInUserName() %>

While this is closer, it will output JavaScript like:

const currentUser = John Smith

However, this is not valid JavaScript because the string isn't enclosed in quotes. To handle special characters like apostrophes in names such as Paddy O'Brien, you should convert the string to Json using a function. If you have access to helper functions like Razor, it would look something like:

const currentUser = <%= Html.Json(PageMethods.GetSession_LoggedInUserName())%>;

Answer 3

Answer №2

To create the method, make sure it is marked as static and decorated with the WebMethod attribute.

[WebMethod]
public static string FetchLoggedInUsername()
{
 ...
}

Answer 4

To create the method, make sure it is marked as static and decorated with the WebMethod attribute.

[WebMethod]
public static string FetchLoggedInUsername()
{
 ...
}

Answer 5

Answer №3

To ensure proper access, it is recommended to declare your function as public static instead of protected.

public static string RetrieveLoggedInUser()
{
        SessionConfiguration configurationObject = (SessionConfiguration)Session["Configuration"];
        return configurationObject.LoggedInUserName;
}

When calling this function in a cshtml file, use the following syntax:

<script type="text/javascript" >
    $(document).ready(function () {
        var loggedInUser = '@PageMethods.RetrieveLoggedInUser()'
        alert(loggedInUser);
    });
</script>

Answer 6

To ensure proper access, it is recommended to declare your function as public static instead of protected.

public static string RetrieveLoggedInUser()
{
        SessionConfiguration configurationObject = (SessionConfiguration)Session["Configuration"];
        return configurationObject.LoggedInUserName;
}

When calling this function in a cshtml file, use the following syntax:

<script type="text/javascript" >
    $(document).ready(function () {
        var loggedInUser = '@PageMethods.RetrieveLoggedInUser()'
        alert(loggedInUser);
    });
</script>

Invoking a C# function inside a cshtml file

Answer №1

Answer №2

Answer №3

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