如何在回调函数中传递参数？

Question

I want get email (text value from txtEmail field) in callback

I have text field :

  <asp:TextBox MaxLength="50" runat="server" ID="txtEmail" ClientIDMode="Static" onblur="SendRequest()"></asp:TextBox>

my javascript handler :

 <script type="text/javascript">
      function SendRequest(arg) {
           window.UseCallback(arg);
      }
 </script>

and server event handler

 protected void Page_Init(object sender, EventArgs e)
 {
    string cbReference = Page.ClientScript.GetCallbackEventReference(this, "arg", "GetEmailFromServer", "context");
    string cbScript = "function UseCallback(arg, context){" + cbReference + ";}";
    Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "UseCallback", cbScript, true);
 }

 public void RaiseCallbackEvent(string eventArg)
 {
     var result = Controller.CheckEmail(eventArg);      // eventArg == undefined
 }

How can I set eventArg to txtEmail.Text ?

Answer 1

Change This Line and Check

 string cbScript = "function UseCallback(arg){" + cbReference + ";}"; 

or change this

<script type="text/javascript">        
       function SendRequest(arg) 
        {
             window.UseCallback(arg,"");
        }   
</script>