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Home > Forums > Programmers > Web Development > Sun: Servlets and JavaServer Pages (JSP) Forum

Assigning a value to a JSP variable from a Script

thread695-76741
Read More Threads Like This One
blueindian1 (Programmer)
25 Apr 01 14:08
Hi,

Is it possible to assign a value to a JSP variable with a script?  I want to do something like the following:


<% String str = "jsp"; %>

<SCRIPT LANGUAGE="JavaScript">
<!--
if (document.all) {
  <%str = "modifed_by_the_script"; // assignment only when condition is met%>
  alert("Internet Explorer Detected");
}
// -->
</SCRIPT>

The way I have it, the string has a new value assigned regardless of whether the "if" condition is met

Thanks,

Rich
tiz (Programmer)
25 Apr 01 20:27
Nope, you can't really.

Can't think why you'd want to though? For browser detection, try:

<SCRIPT LANGUAGE="JavaScript">
<!--
n = (document.all) ? 0 : 1;
if (n) {
  alert("This is Netscape!");
} else {
  alert("This is IE!");
}
//-->
</SCRIPT>

The JSP engine ignores any conditional operators used in your JavaScript code so you can't embed any JSP scriptlets between the if statement for example. Take the following:
<% String str; %>
<script>
if (xyz) {
  <% str = "Test 1"; %>
} else {
  <% str = "Test 2"; %>
}
</script>

Will always set str to "Test 2" in your compiled JSP.

If you really need this kind of functionality, you may consider using Resin-JavaScript from Caucho.com - http://www.caucho.com/products/resin-js/.

Hope this helps,

Tim

--
Tim <tim@planetedge.co.uk>
blueindian1 (Programmer)
26 Apr 01 7:41
thanks!

the reason that i need to do it is because i need to know the browser type on the first page of my site after login. i can't use the login page to get it b/c the back end for the login process in a black box provided by i2, so i don't have access to that code.  i would like to get it it without having to post the first page immediatily after a user logs in ...but it looks like that is what i will have to do.
blueindian1 (Programmer)
26 Apr 01 7:43
one more thing...

i need to render different JSP depending on the browser...which is why I need for the JSP to know the browser...not just the Script.

:) thanks again
tiz (Programmer)
26 Apr 01 8:27
Well, you can get the browser type by simply parsing the string 'ua' in the following example:

<%

String ua = request.getHeader("user-agent");

out.println(ua);

%>


Based on whether 'ua' contains 'MSIE' or 'NAV' will tell you the browser type.

I suggest you use <jsp:forward> or <jsp:include> to display the appropriate HTML based on the browser type.

HTH,

Tim

--
Tim <tim@planetedge.co.uk>
blueindian1 (Programmer)
26 Apr 01 8:41
Tim,

You are the man!  I can't believe it's so easy....I've been looking forever!

Thanks,

Rich
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