Example 1:
Page:
<Body>
<Form ID = "form1" runat = "server">
<Div>
<Input id = "txtmessage" value = "client:"/>
<Input onclick = "calltoserver ();" type = "button" value = "call to server"/>
Result:
<Input id = "txtresult"/>
</Div>
</Form>
</Body>
JS:
<SCRIPT type = "text/JavaScript">
Function calltoserver ()
{
VaR Param = Document. getelementbyid ("txtmessage"). Value + "dddd ";
// Var context = "client context ";
<% = Callbackscript %>
// Alert (this. calltoserver );
}
Function handleresultfromserver (result)
{
Document. getelementbyid ("txtresult"). value = result;
}
</SCRIPT>
Background code:
Public partial class _ default: system. Web. UI. Page, icallbackeventhandler
{
Private string sresult = "";
Protected void page_load (Object sender, eventargs E)
{
}
Public String callbackscript
{
Get
{
Return this. clientscript. getcallbackeventreference (this, "Param", "handleresultfromserver", null );
}
}
Public void raisecallbackevent (string eventargument)
{
This. sresult = "the client sends the [" + eventargument + "]." In ["+ datetime. Now. tostring () +"]. ";
}
Public String getcallbackresult ()
{
Return this. sresult;
}
}
Example 2:
Page + JS:
<HTML xmlns ="Http://www.w3.org/1999/xhtml">
<Head runat = "server">
<Title> No title page </title>
<SCRIPT type = "text/JavaScript">
// Called by the button
Function callserver (inputcontrol, context)
{
Context. innerhtml = "loading ";
Arg = inputcontrol. value;
// Register the callback Method
<% = Clientscript. getcallbackeventreference (this, "Arg", "eseserverdata", "context") %>;
}
// The function registered in the callback method to receive returned results
Function compute eserverdata (result, context)
{
Context. innerhtml = result;
}
</SCRIPT>
</Head>
<Body>
<Form ID = "form1" runat = "server">
<Div>
<Asp: textbox id = "textbox1" runat = "server"> </ASP: textbox>
<Input id = "button1" type = "button" value = "Submit to label1" onclick = "callserver (textbox1, label1)"/> <br/>
<Asp: Label id = "label1" runat = "server" text = "label1:"> </ASP: Label>
</Div>
</Form>
</Body>
</Html>
Background code:
Public partial class default2: system. Web. UI. Page, icallbackeventhandler
{
Protected void page_load (Object sender, eventargs E)
{
}
Private string STR;
Public void raisecallbackevent (string eventargument)
{
// Different processing logic can be called based on different passed parameters
STR = "content returned from the server:" + eventargument;
}
Public String getcallbackresult ()
{
Return STR;
}
}
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