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Calling server side function from client side

Posted on 2002-06-11
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241 Views
Last Modified: 2012-05-04
How to call server-side function from client side without posting response. Sample code below

<%@ Language=VBScript %>
<%
function ShowMe()
  Response.write "Hello world!!!"
end function
%>
<html>
<body>
<form name="Form1" method=post action=myasp.asp>
<input type="button" name="load" value="load" onclick="javascript:ff();">
</form>
</body>
</html>
<script LANGUAGE="JavaScript">
function ff()
{
     eval("<%zz = ShowMe()%>")
     alert(zz);
}
</script>
0
Comment
Question by:sanjuo
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7 Comments
 
LVL 1

Expert Comment

by:choroque
ID: 7071679
<%@ Language=VBScript %>
<%
function ShowMe()
 Response.write "Hello world!!!"
end function
%>
<html>
<body>
<form name="Form1" method=post action=myasp.asp>
<input type="button" name="load" value="load" onclick="javascript:ff();">
</form>
</body>
</html>
<script LANGUAGE="JavaScript">
function ff()
{
    <%zz = ShowMe()%>
    alert('<%=zz%>');
}
</script>
0
 
LVL 12

Expert Comment

by:Wouter Boevink
ID: 7072051
You cannot execute a function on the server without a roundtrip to the server.
0
 
LVL 11

Accepted Solution

by:
ASPGuru earned 30 total points
ID: 7072160
choroque, your code will not work...

sanjuo, wboevink is right, actually...
you can't really...

of course i can make your code work the way you expect it, but only by calling the function _before_ sending the data to the browser... have a look at this:

<%@ Language=VBScript %>
<%
function ShowMe()
 ShowMe = "Hello world!!!"
end function
%>
<html>
<body>
<form name="Form1" method=post action=myasp.asp>
<input type="button" name="load" value="load" onclick="javascript:ff();">
</form>
</body>
</html>
<script LANGUAGE="JavaScript">
function ff()
{
    alert("<%=ShowMe()%>");
}
</script>

ASPGuru
0
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Author Comment

by:sanjuo
ID: 7072985
First thank all for your efforts,

ASPGuru,

I want the server-side function get executed when you press button not before that.

I saw some code which uses xmlhttp service to overcome this problem. Really I did not understand that code and I lost that link also. I will try to find that link. Let you know.
0
 
LVL 3

Expert Comment

by:dragosh
ID: 7073009
hi there

here is a simple example of using XMLHTTP :


demo.asp
========

<%@ Language=VBScript %>
<HTML>
<HEAD>
<script language="javascript">
<!--
function doAction()
{
     var xmlhttp = new ActiveXObject("MSXML2.XMLHTTP");
     xmlhttp.open("POST", "action.asp?action=X", false);
     xmlhttp.send("text");
     mydiv.innerHTML = xmlhttp.Responsetext;
}

// -->
</script>
</HEAD>
<BODY>

<P>xmlhttp demo</P>


<input type="button" name="btnAction" value="action" onclick="javascript:doAction();">
<div id="mydiv"></div>

</BODY>
</HTML>

action.asp
==========

<%@ Language=VBScript %>
<%

If Request.QueryString("action") = "X" Then
     Response.Write Request.ServerVariables("REQUEST_METHOD")
Else
     Response.Write Request.TotalBytes
End If
%>


i hope this will help
0
 
LVL 11

Expert Comment

by:ASPGuru
ID: 7073169
XMLHTTP will only work in IE and NS6 maybe...

is this ok for you?

ASPGuru
0
 
LVL 4

Expert Comment

by:Wakie
ID: 9142969
It appears this question has been abandoned.

I will leave a recommendation in the Cleanup topic area that this question will be:

- Question PAQ'd and points to ASPGuru -

Please leave any comments here within the next seven days.

DO NOT ACCEPT THIS COMMENT AS AN ANSWER!

Wakie,
EE Cleanup Volunteer.
0

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