asked on

Combining asp and javascript

I have the following aspx page:

<html>
<head>
<script language=javascript>
function xx(a)
{
// whatever
}
</script>
</head>
<body>
.. form, contols, etc
<%
if (some_var_set_in_my_codebehind)
xx(some_other_var)
%>
</body>
</html>

But when I run it I am getting a compilation error from the xx() call:

Compiler Error Message: CS0103: The name 'xx' does not exist in the class or namespace 'ASP.addTrans_aspx' (name of my page)

Help!

crescendo

The "<%" means that you are running server-side code, and the xx function is client-side.

SOLUTION

crescendo

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RichardFox

ASKER

Duh, I'm an idiot. But the solution will not work, some_other_var is a server side variable. This must be a common thing, to pass server side vars to a client-side function, how is it normally done?

SOLUTION

mmarinov

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crescendo

<<But the solution will not work>>

It should work, it will put a call to the client-side function into the out stream. You need:

<script>
<%
if (some_var_set_in_my_codebehind)
Response.Write "xx(" + some_other_var + ")"
%>
</script>

which, if "some_other_var" has the value 'abc' will end up in the browser as

<script>
xx(99)
</script>

mmarinov

and why it will not work ?
what will output my code ? :)
B..M

ASKER CERTIFIED SOLUTION

Freak4VB

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RichardFox

ASKER

crescendo, this page:

test.aspx:

<html>
<head>
<title>ServerClientTest</title>
<script language=javascript>
            myfunction(mystr)
            {
                  alert(mystr);
            }
</script>
</head>
<body>
SOME TEXT
<script language=javascript>
<%
      string s = "es tevi milu!";
      Response.Write("myfunction('"+s+"');");
%>
</script>
</body>
</html>

doesn't work. THere are no errors, but myfunction() is never executed. I have no idea why, from the source code of the html in the browser, it looks like it should work. But it doesn't.

I am going to test mmarinov's code next...

crescendo

Shouldn't it be "var" rather than "string" in

string s = "es tevi milu!";

Freak4VB

Hang on guys !

I just wanna comment on this last piece of code although it is apparent that no one is even looking at my posts :-)

Change the last part to this

<script language=javascript>
<%
dim s
s = "es tevi milu!"
Response.Write("myfunction('"+s+"');")
%>
</script>
This should take care of everything
This is because you are decalring this "s" in server side script tags.

RichardFox

ASKER

Au contraire Freak, I am reading your posts! But why should my server side code defautl to VB instead of C#? ANyway I put

<%@ Page language="c#" %>

At the top of this page, and my html source code in the browser looks like:

<html>
<head>
<title>ServerClient 0</title>
<script language=javascript>
            myfunction(mystr)
            {
                  alert(mystr);
            }
</script>
</head>
<body>
SOME TEXT
<script language=JavaScript>
myfunction('es tevi milu!');
</script>
</body>
</html>

which looks like it should work but it doesn't! #$%@#!

Freak4VB

hey man got it !!!

loll u wont b'live it !! change the declaration of myfunction dude !!
make it like this

<script language=javascript>
function myfunction(mystr)
{
alert(mystr);
}
</script>

Peace !!

RichardFox

ASKER

omygod i'm an idiot!! yep that did it

one more question, for mmarinov why doesn't

<%@ Page language="c#" %>
<html>
<head>
<title>ServerClient 2</title>
<script language=javascript>
            function myfunction()
            {
                  alert('es tevi milu!');
            }
</script>
</head>
<body>
SOME TEXT
<%
      String s = "<script language=JavaScript>myfunction();</script>";
      if (!this.IsClientScriptBlockRegistered("clientScript"))
this.RegisterClientScriptBlock("clientScript", s);
%>
</body>
</html>

work?

Freak4VB

I think I can answer that as well dude !!
Dont use these <% tags for the kind of operation u are attemting.
Instead wrap up ur code like this

<Script runat="server">

String s = "<script language=JavaScript>myfunction();</script>";
if (!this.IsClientScriptBlockRegistered("clientScript"))
this.RegisterClientScriptBlock("clientScript", s);

</Script>

Better yet if you can have it like this
<Script runat="server">

public void Page_Load()
{

String s = "<script language=JavaScript>myfunction();</script>";
if (!this.IsClientScriptBlockRegistered("clientScript"))
this.RegisterClientScriptBlock("clientScript", s);
}
</Script>

Make some adjustments for syntax errors as me is not really a C# guy :-)

Reason- will tell u in my next post if this thing wud work :-)

Let the Gods Rule !!!

RichardFox

ASKER

ok, great but what is the difference between <% %> and <script runat="server"></script> ?

Freak4VB

to be honest....I thought i had a theory about it but the more i think about it the more I get confused...i will try and look it up on the net and see if I can find out something about it.

And thanks for accepting my post as your answer !

RichardFox

ASKER

ok, please let me know because I can't find anything on it