java script

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Hi The below code raise error para is undefined can any body help me why?

JavaScript

function abc() {  // java script code
    var   para=new Object();
    para="manoj";
    var retval=<%=aaa(para) %>;
    alert(retval);
    }


public String aaa(string aa)  // c# code
    {
        return (aa == "manoj" ? "manoj" : "kumar");
    }

Posted 23-Nov-10 4:15am

Manoj_0603514007

Updated 23-Nov-10 4:24am

Henry Minute

v2

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Henry Minute 23-Nov-10 10:26am

For your future reference. If you enclose your code snippets in <pre>your code......</pre> tags, it makes it easier to read and helps preserve formatting. :)

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fjdiewornncalwe · Answer 1 · 2010-11-23T04:46:00

Solution 3

When you place "para" inside the <% %> brackets, and your javascript resides on your .asp(x) page, then you must have the "para" variable defined in your code behind. Anything in between these brackets is interpreted by the server and not the javascript interpreter.

Posted 23-Nov-10 4:46am

fjdiewornncalwe

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Manfred Rudolf Bihy 23-Nov-10 11:00am

I think it's some deprived (depraved) little soul that is suffering from low self esteem. So what! Take my 5 instead :)
Anyhow! We know we're right and sometimes that just has to be enough.

Manfred Rudolf Bihy · Answer 2 · 2010-11-23T04:48:00

Solution 4

Hi Kumar,

<![CDATA[<%=aaa(para) %>]]>

is code in a server side, which means
this will be executed on the server and not on the client (like the
javascript block that server side code tag is written in).
So the problem is, I assume, that there is no variable para declared in
your code behind file and that's what the compiler is complaining about.

Hope this helps!

Cheers

Manfred

Posted 23-Nov-10 4:48am

Manfred Rudolf Bihy

Comments

fjdiewornncalwe 23-Nov-10 10:54am

Apparently the uni-voter has hit this thread... BTW... Nice catch...(I obviously agree with your answer as well)

Jules VDV · Answer 3 · 2010-11-23T04:45:00

The problem is the following line

var retval=<%=aaa(para) %>;

Because you are trying to use a variable defined in javascript inside what is essentially a C# (I assume) code block. The variable para does not exist within this section.

One way to get around this (May work for you)

function abc(){
  var jsVar = "manoj";
  var hiddenControl = <%= inpHdn.ClientID %>;
  document.getElementById(hiddenControl).value=jsVar;
}

Then use a form to store the value:

<form id="frm">
  <input type="hidden" id="inpHdn"  runat="server" />
</form>

Then in your code-behind you could use this:

private void aaa()
{
  return (inpHdn.Value == "manoj" ? "manoj" : "kumar");
}

java script

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