Leveraging ASP.Net session within JavaScript

I need to perform a JavaScript operation using data stored in the session (

System.Web.HttpContext.Current.Session["Filtre"]
)

Is it feasible to access and process data in JavaScript from the ASP.NET session?

I attempted to use the following code sample, but it did not work as expected:

var filter = '<%=Session["Filtre"]%>';

If accessing the data directly is not secure or possible, can I call an aspx.cs function from JavaScript to perform the required operation?

Thank you and have a wonderful day.

javascriptc#asp.netsession

Answer №1

It's important to keep in mind that client side javascript and server side code, like sessions, cannot be mixed as they do not operate simultaneously.

In your case

var f = '<%=Session["Filtre"]%>';

might seem to work, BUT:

  • The server must first execute the <% %> block to generate a string, which is then included in some text
  • This text is then sent to the browser, potentially as part of a page
  • Only once it reaches the browser will it be interpreted and executed as javascript

There isn't a simple way for the browser to run arbitrary server-side code. More complex methods involve using AJAX calls to invoke specific methods on the server.

Answer №3

A C# method can be called by JavaScript if the method is annotated with WebMethod, allowing it to be accessed by remote Web clients as a 'page method'. For more information, refer to MSDN.

To utilize Session within the method, ensure that the EnableSession property is set to true. Here's an example:

[WebMethod(EnableSession=true)]
public static int Example() {
...

Then, invoke the page method using JavaScript, typically with help from jQuery. 

   $.ajax({
        type: "POST",
        url: "MyPage.aspx/Example",
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        data: "{ }",
        error: function (XMLHttpRequest, textStatus, errorThrown) { alert(langError + " " + textStatus); },
        success: function (msg) {
            alert(msg.d);
        }
    });

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