How to assign Javascript variable to JSP variable ?

Hi

I dont think it can not be (as i know nothing in the programming is impossible !) but i know it is not a direct solution.

redirecting is a solution but not on my case , because the value is calculated using Java Script , and i want to use it programmingly inside JSP on the same page  !!!

to make the things a little bit clearer , i want to describe the problem that guide to suggest this solutions in more details:

i have a Javascript function which takes a parameter a javascript variable defined in the header , but with some additional suffix and prefix to form a new variable, for example:

<script>
// This variable is generated automatically in the form FS_<Year Value>_Q1
FS_2005_Q1=" Just an example " ;

function printSomething( value)
{
// Print The Value
}

</script>


<script>

var yearValue=// the value of the current year ;

</script>

...... Some HTML Code .....

<script>
// print the variable:  FS_<The Value of the variable yearValue>_Q1
printSomthing("FS_"+yearValue+"_Q1") ;
</script>

I dont think the printSomething(..) Call that i wrote is correct (Not work with me)  , so how can i write it in the correct way ?


Thanks

I can

>>printSomthing("FS_"+yearValue+"_Q1") ;
is this printSomething part of Javascript or JSP ? if is Javascript you may need using the eval function, here is an example:

<script language="JavaScript">
      function printSomething(v) {
            document.write("Now is " + v);
            alert(v);
      }
      
      var testDate = new Date();
      eval("printSomething('"+testDate+"');");
</script>

is this what you looking for.. or ?? ..

Dear ryancys

printSomething is part of Javascript not JSP.

The problem is that the variable Name should be passed to printSomething is it self a variable !

The variable that should be passed to PrintSomething as i described above is combined as the following : FS_<Value Of Another Variable>_Q1 , for example :

printSomething(FS_<SimpleVariable>_Q1) ;


I can do it if <SimpleVariable> is JSP variable , but what if <SimpleVariable> is JavaScript variable ?

If it is JSP Variable i will do it like the following :

printSomething(<%="FS_"+SimpleVariable+"_Q1"%>) ;


BUT , how can i dot it if SimpleVariable is JavaScript variable ???


Thanks

 

>>I can do it if <SimpleVariable> is JSP variable , but what if <SimpleVariable> is JavaScript variable ?
The short answer is you can't. As I explained earlier JSP variables are executed on the server before any Javascript is run.

You will need to implement your code in Java on the server rather than to do it as Javascript on the client-side. In this case it would be creating a new Date in java and then outputting th result of this into the javaScript.

 

>>how can i dot it if SimpleVariable is JavaScript variable ???
if SimpleVariable is JavaScript variable, you can try use the eval function as i mentioned above, like:

...
SimpleVariable = "2005";
eval("printSomething(FS_"+SimpleVariable+"_Q1) ;");
...

?

Hi ryancys ,

It does not work !

let me give you the complete example :

<script>

printSomething(<%="FS_"%>2005<%="_"+QuarterValue%>) ;

//QuarterValue is JSP Variable either : Q1 , Q2 , Q3 , Q4

</script>


Now , how can i replace 2005 with SimpleVariable , when i directly replace it , it does not work !!
When i replace it using eval function it does not work !!


Regards,
 

hmm, try:

...
SimpleVariable = "2005";
eval("printSomething(FS_"+SimpleVariable+"_<%=QuarterValue%>);");
...


or:

...
SimpleVariable = "2005";
eval("printSomething('FS_"+SimpleVariable+"_<%=QuarterValue%>');");
...

?

post your current "printSomething" function here if necessary. regards

Dear ryancys , bloodredsun  

Thanks alot , I recode the Javascript function to JSP , and it is OK now !

Thanks again

Glad to help :-)

but why did I only get 600 points when you did what I recommended by recoding it as Java ?

My post
"You will need to implement your code in Java on the server rather than to do it as Javascript on the client-side"

Your answer
"I recode the Javascript function to JSP , and it is OK now"

 :-S

Sorry bloodredsun ,

The recoding actually is not solution , i did not get a direct solution either from you or from ryancys  , but i measure the splitting decision based on what each of you provide to me , i think ryancys  was more interactive and provide me with possible solutions that i did not think about , and give me some hints to use eval function more and more in my coming JavaScript codes !!

Thanks All :)