Setting a jsp var to that of a JS var

[Defender1]

Subject pretty much says it all.

All I want to know is how I would set a Javascript variable to a JSP var.

I can't figure it out for the life of me...

Also, I need the JS var to be an Int, as I'm sending this to a java class that takes in an int as an argument.

[Anarchos]

Just pass it in the query string, then Integer.parseInt() the value.

[Defender1]

Query string?

I was doing parseInt, but I couldn't get the variable INTO JSP, that's my problem:

int intSsg = Integer.parseInt("<script>document.write(ssg)</script>" );

That gives me this error:

java.lang.NumberFormatException: For input string: ""

[vgarcia]

Subject pretty much says it all.

All I want to know is how I would set a JSP variable to a Javascript var.

I can't figure it out for the life of me...

Also, I need the JS var to be an Int, as I'm sending this to a java class that takes in an int as an argument.

Wouldn't this do it?

<%
 //declare the variable in JSP
 int foo = 4;
%>
<script type="text/javascript">
  var foo = parseInt(<% out.print(foo);%>);
</script>

[Defender1]

Bleh, i'm such a blind fool. I need to send a JS var TO jsp...
Like I said earlier, I need to send a java class a JS variable.

[Anarchos]

He's trying to read a javascript variable from JSP, not vice versa. But you can't execute javascript code directly from JSP as far as I know.

[vgarcia]

He's trying to read a javascript variable from JSP, not vice versa. But you can't execute javascript code directly from JSP as far as I know.

Exactly. JSP is server-side and Javascript is client-side. If you want JSP to read the JS variable you'd have to load it up in the querystring or load the value into a hidden form field, then reload the page or send the visitor to another page.

[Defender1]

I am refreshing the page, but like i said, how can JSP get the var?

[Defender1]

No one else? [img]images/smilies/frown.gif[/img]

And by querystring did ya mean the url (GET)?

So basically that and a form are my only choices?

[vgarcia]

No one else? [img]images/smilies/frown.gif[/img]

And by querystring did ya mean the url (GET)?

So basically that and a form are my only choices?

Pretty much, sorry.

[Defender1]

Ok, thanks. It sort of makes things easier though.