Call a Javascript Method from code-behind Web Method

Question

I have a web method in my code behind:

[System.Web.Services.WebMethod]
public static string GetStateData(string state)
{
  //this is where i want to call a javascript method "GetItems"
}

I have a javascript method that retrieves some values for me and I want to get use one of those values in my web method

function GetItems() {
        var variable1= $("#<%=Item1.ClientID %> input:checked");
        var variable2= $("#<%=Item2.ClientID %>").val();
        return [variable1.text(), variable2.val(), variable2];}

I've searched for ways to call the javascript method from the web method but every time my search results in how to call a web method from javascript.

I did find this but it was done from the code-behind of a silverlight project and when I tried adding the correct reference to my code-behind it wasn't there

var result = HtmlPage.Window.Invoke("GetItems");

Is there a reference I'm missing?

Thanks for your response

What exactly are you trying to achieve?

Oded
– Oded

2011-01-25 20:58:25 +00:00
Commented Jan 25, 2011 at 20:58 — Oded
– Oded, Commented Jan 25, 2011 at 20:58

Raynos · Accepted Answer · 2011-01-25 20:58:31Z

3

You can't do that. Your calling a webmethod through AJAX. your sending small pieces of information to a static method on the server that knows nothing about the specific page object (That isn't static).

What you want to do is send those values and data in the AJAX call to the webmethod. Your not making a full postback so you know nothing about the current state of the page except what you pass as paramaters to the webmethod.

Either send the information in the first place or return with some kind of flag when you want the information and get the client to make an ajax call back to another function with the information and let it continue from there.

answered Jan 25, 2011 at 20:58

Raynos

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Comments

Oded · Accepted Answer · 2011-01-25 21:00:40Z

0

Instead of trying to call javascript from a webmethod use the return value of the webmethod to decide what javascript function to call.

Calling javascript from a webmethod is not possible as far as I know - you need to understand the distinction between server side and client side code.

answered Jan 25, 2011 at 21:00

Oded

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