Question

How can I use a javascript variable in jsp code

Asked by: hung2003

here is my situation,

I have a javascript function at the very beginning of my jsp
for example,

var TT = 'false';
function set_flag(flag_value){
   TT = flag_value;
}

Now, in my jsp (same file) I need to do a condition to decide which message I'm going to show on the browser, and the condition is depend on the value of variable TT. E.g.

if (TT == 'true'){
<tr><td>TT is true
}else{
<tr><td>TT is false
}
</td></tr>

How can I use the javascript variable TT in my jsp code? Thank you! pretty urgent.

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Asked On
2005-08-24 at 12:29:42ID21538885
Tags

javascript

,

jsp

,

coding

,

how

,

use

Topic

Java Server Pages (JSP)

Participating Experts
4
Points
500
Comments
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Answers

 

by: gdrnecPosted on 2005-08-24 at 12:46:58ID: 14746377

Problem is that the variable TT is being changed on the browser side after the JSP is interpreted and rendered so the jsp can't actually do anything with it as far as I know. It is possible for an Applet to comunicate with javascript on the current page but that doesn't sound applicable here.

Can you describe the application in any more depth?

 

by: bloodredsunPosted on 2005-08-24 at 14:03:33ID: 14747139

gdrnec is correct in that the jsp is evaulated before the javascript.

For what you want to do you have 2 options.

1./ You could write the JSP variables into the javascript
e.g.
var TT = '<%= myJavaVariable%>';
function set_flag(flag_value){
   TT = flag_value;
}

2./ You display your message using only JavaScript

function set_flag(flag_value){
   if (flag_value){
    document.getElementById("trueMessage").style.visibility="visible";
   }else{
    document.getElementById("falseMessage").style.visibility="visible";
   }
}

<div name="trueMessage" style=" visibility:hidden">True</div>
<div name="falseMessage" style=" visibility:hidden">False</div>

 

by: bloodredsunPosted on 2005-08-24 at 14:39:26ID: 14747443

Another option is to use JavaScript  objects to create an array of objects as is done here

http://www.vodafone-i.co.uk/phone_comparitor.htm

 

by: tusharganguliPosted on 2005-08-26 at 12:05:53ID: 14763902

one more solution could be
to declare a hidden value in the html section of teh code
 set the value of the variable in the javascript function
submit to this form again
in the jsp section retrieve the parameter value from the request object
based on the value you can display whatevere you want to.

 

by: jimaricatPosted on 2005-09-04 at 00:18:00ID: 14818640

its almost similar to the same case suggested by tusharganguli

i have done this by using hidden iframe. this is possible only if you make the jsp coding in the iframe and javascript in the main page.invoke this jsp page in the iframe from the javascript along with that parameter you want. in the jsp file then display what you want accordingly with the parameters values

<html>
<body>
<iframe name=abcd width=100% height=100%></iframe>
</body>
<script>
var TT = 'false';
function set_flag(flag_value){
   TT = flag_value;
}
window.abcd.location.herf='yourjsp.jsp?TT='+flagValue;
</script>
</body>
</html>

cheers
jim

20120131-EE-VQP-002

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