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Insert JSP inside Javascript

Posted on 2004-08-31
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Medium Priority
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Last Modified: 2008-02-01
Hi,

I need to determine if the browser supports javascript or not and redirect the user appropriately.  If the user does not support js, I will have to use "response.sendRedirect" in jsp, if not I can use the form action tag.  I want to know if the following code works.  Can anyone confirm if I am doing the right thing.  

Thanks.

<%
      String sRedirect = "http://www.yahoo.com";
%>
<html>
<head>
<title>Test</title>
</head>
<script>
document.write('JavaScript is turned on!');
function submitForm() {
  document.testForm.submit();
}
</script>
<body onLoad="submitForm()">
<noscript>
  <p>
   <b>
        JavaScript is turned off!
   <%
         System.out.println(" -- javascript is turned off ---- ");
      System.out.println(" -- redirect url = " + sRedirect);
      
      if(sRedirect!=null && sRedirect.length()>0)       
            response.sendRedirect(sRedirect);
      %>
   </b>
  </p>
</noscript>
<form name="testForm" action="<%=sRedirect%>" method="post">
</form>
</div>
</body>
</html>
0
Comment
Question by:radha77
7 Comments
 
LVL 35

Expert Comment

by:TimYates
ID: 11944847
>      if(sRedirect!=null && sRedirect.length()>0)      
>           response.sendRedirect(sRedirect);

that will send you to the other site via the

          response.sendRedirect(sRedirect);

in every case (whether you have javascript or not), as the JSP will be executed at the server (before the client gets the page), and you will go to the redirect site before the javascript has a chance to function...
0
 

Author Comment

by:radha77
ID: 11945256
Thanks for your response.  Well what I am actually trying to achieve is to reduce the time it takes to go to the other page.  I have seen more than once that "response.sendRedirect(sRedirect);" takes more time than js "window.location".  How can I accomplish this?  Pls let me know.

Thanks.
0
 
LVL 11

Expert Comment

by:sompol_kiatkamolchai
ID: 11948580
    if(sRedirect!=null && sRedirect.length()>0)      
          response.sendRedirect(sRedirect);

This code will execute every time you access this jsp and not depends on whether browser support javascript or not. since javascript will execute after jsp code.
0
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LVL 35

Expert Comment

by:TimYates
ID: 11949985
I'd just use response.sendRedirect as that is guaranteed to work in every case...

Maybe I'm missing the point though...  could you explain the problem a bit more if that answer isn't good enough? :-)
0
 
LVL 6

Expert Comment

by:CodingExperts
ID: 11949992
Hi radha
I would suggest you to display the message "Javascript Not enabled.Either enable JavaScript or Alternatively click on the link"  with a link for an alternate url for the user .

Coding Experts
0
 

Author Comment

by:radha77
ID: 11969672

Thanks all for your responses.  I bascially want to avoid response.sendRedirect as it take more time to redirect.  Well I have used meta refresh tags with noscript and it serves the purpose.

<!--When javscript is disabled -->
<noscript>
<p>JavaScript is turned off!</p>
<meta http-equiv="Refresh" content="0;url=<%=sRedirect%>">
</noscript>

<!--when javscript is enabled -->
<form name="testForm" action="<%=sRedirect%>" method="post">


0
 

Accepted Solution

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CetusMOD earned 0 total points
ID: 12524860
PAQed, with points refunded (50)

CetusMOD
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