calling c# method from JvaScript

Question

User2014555709 posted

Good day.

In *.aspx.cs

public partial class select : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
       // many strings
    }
   
    [WebMethod]
    public void strechGMap(int H, int W)
    {
        BigGMap.Height = new Unit(H);
        BigGMap.Width = new Unit(W);
    }
}

 

In *.aspx

<script type="text/javascript">
 function OnSplitterResized(splitter)
    {
        //Get the left pane's client size
        var w = splitter.getRightPane().getWidth();
        var h = splitter.getRightPane().getHeight();

        
        select.strechGMap(h, w);
    }
</script>

Whats wrong? Why function call "select.strechGMap(h, w);" doesnt work?

Answer 1

User-821857111 posted

The C# method is on the server.  Javascript runs on the client (the user's browser).  For the Javascript to interact with the web method, you need to use AJAX to run a request.  Even then, the C# method needs to have a return type other than void, so it returns some values for the javascript to work with.  Although these examples call a server-side method that interacts with a database using jQuery, the basics are the same as you are trying to achieve: http://www.mikesdotnetting.com/Article/104/Many-ways-to-communicate-with-your-database-using-jQuery-AJAX-and-ASP.NET

Answer 2

User-2070791419 posted

  1. use PageMethods instead of select.

     The js call should be

   PageMethods.strechGMap(h, w);


2. the web method should public static 

3. You need EnablePageMethods="true" on your ScriptManager.