JavaScript into Asp Page

Question

i am learning javascript client side scripting language and i am using js in ASP.. i dont know when i compile the code, it shows

COMPILATION ERROR:Compiler Error Message: CS1061: 'ASP.default_aspx' does not contain a definition for 'popup' and no extension method 'popup' accepting a first argument of type 'ASP.default_aspx' could be found (are you missing a using directive or an assembly reference?)

here is my code :

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WEB_test_app._Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Shuraat Web ki</title>
    <script type ="text/javascript">
    function popup()
    {
    alert("popup!!");
    }    
    </script> 
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Button ID="Button1" runat="server" Text="Button" OnClick ="popup()"/>

      <script type ="text/javascript">
      document.write("Abid");
      </script>   
    </div>
    </form>
</body>
</html>

can somebody edit the code :/.. please..

Abid Ali
– Abid Ali

2011-02-13 08:34:35 +00:00
Commented Feb 13, 2011 at 8:34 — Abid Ali
– Abid Ali, Commented Feb 13, 2011 at 8:34
i dont know how to edit.. :/ sorry

Abid Ali
– Abid Ali

2011-02-13 08:35:01 +00:00
Commented Feb 13, 2011 at 8:35 — Abid Ali
– Abid Ali, Commented Feb 13, 2011 at 8:35

Frédéric Hamidi · Accepted Answer · 2011-02-13 08:48:48Z

5

You're confusing client-side and server-side events. The popup() function is written in Javascript and runs on the client, but OnClick is a server-side event, so its handler runs on the server and has to be written in the language of your page (C#). popup() has no meaning in that context.

You can use the ClientClick event in order to handle the button click client-side. Note that you probably should return false from the handler in order to avoid a postback to the server:

<asp:Button ID="Button1" runat="server" Text="Button"
    OnClientClick ="popup(); return false;" />

answered Feb 13, 2011 at 8:48

Frédéric Hamidi

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5 Comments

Abid Ali Over a year ago

what do i do if i wish to write the same code on server side?

Frédéric Hamidi Over a year ago

@Abid, what do you intend to accomplish by showing a modal dialog box on the server? :)

Abid Ali Over a year ago

umm.. :) i dont know.. i was just trying things without thinking what i want to do actualy :)

Abid Ali Over a year ago

actually, i am a newbie.. i just try and try and try.. i dont exactly know what to do..

Frédéric Hamidi Over a year ago

@Abid, well, you could handle the click event server-side (using OnClick), but then popup() should be written in C#, and should register a script to call alert() on the client when the page has finished loading. Check out RegisterClientScriptBlock() for the gory details.

Ken D · Accepted Answer · 2011-02-13 08:46:13Z

1

You have to assign popup() to the event OnClientClick instead of Click like this:

<asp:Button ID="Button1" runat="server" Text="Button" OnClientClick ="popup()"/>

The reasoning behind your problem is that when the run-time saw OnClick it tried to attatch that event with a C#/VB.Net (Code-Behind) method (which obviously does not exist) and we solved that by attaching the event OnClientClick to your Javascript method.

answered Feb 13, 2011 at 8:46

Ken D

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Comments

gor · Accepted Answer · 2011-02-13 08:48:02Z

1

OnClick - is click handler on server side. If you want to call javascript function, use OnClientClick.

answered Feb 13, 2011 at 8:48

gor

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