Setting session variable in javascript function

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Hi,

I am getting name and email id of a user after he logs in via facebook to my website..
I want to add those variables in session on login form itself using javascript;
I tried following

C#

FB.api('/me', function (me)
 {                       
   if (me.name)
   {
     document.getElementById('auth-displayname').innerHTML = me.name;
     <%Session["fbName"] = me.name; %>
   }
 }

it gives error like me (in this line: <%Session["fbName"] = me.name; %>) does not exist in the current context etc.

How can I do this

Posted 5-Aug-13 23:05pm

sameer.pantvaidya

Updated 5-Aug-13 23:21pm

Thanks7872

v2

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Ankur^\m/ · Answer 1 · 2013-08-05T23:29:00

Solution 2

Session is a server side technology. Client/Browser doesn't know anything about ASP.NET Session.

I am assuming you get the details on client side using JavaScript code. You will need to post back the page and then save the details in the Session variable on the server side.

Posted 5-Aug-13 23:29pm

Ankur^\m/

Comments

Zafar Sultan 6-Aug-13 5:48am

I have a question for you. Can't we set session value inside a JavaScript function?

Ankur^\m/ 6-Aug-13 5:52am

Already answered in your another comment. Let me know if you do not understand, I will try to elaborate it.

Zafar Sultan · Answer 2 · 2013-08-05T23:12:00

Solution 1

I am assuming "auth-displayname" is a server side hidden field. Try replacing

JavaScript

<%Session["fbName"] = me.name; %>

with

JavaScript

<%Session["fbName"] = auth-displayname.Value; %>

Posted 5-Aug-13 23:12pm

Zafar Sultan

v2

Comments

Ankur^\m/ 6-Aug-13 5:28am

But how does that save data in a Session? Session is a server side technology which isn't available to the client.

Zafar Sultan 6-Aug-13 5:39am

Why can't we?

Ankur^\m/ 6-Aug-13 5:55am

Because JavaScript knows nothing about ASP.NET Session. You have used server side tags in your JavaScript code which is called only when the code is executed by asp.net engine.

Zafar Sultan 6-Aug-13 5:58am

OP is using postback.

Zafar Sultan 6-Aug-13 5:42am

We can write inline server side code in javascript using <% %> block.

Ankur^\m/ 6-Aug-13 5:51am

Yes we can. But that is not executed unless the code is executed on server side. In OP's case the value is available on the client side, to save it in a Session the page must post back. I hope I have also answered the the question you asked me in a direct comment.
Btw the vote isn't mine.

Zafar Sultan 6-Aug-13 5:56am

You are correct in your context that to use it the page must post back. The OP's problem says that the variable is not available in the 'current context'. Obviously he is using it on postback. So that was my solution based on the assumption. Infact I also stated that I am assuming he is using hidden filed.

Ankur^\m/ 6-Aug-13 6:00am

Read the question again. OP has clearly described that he has got the data from facebook on his login form and want to save it using javascript itself. That means the data is available on the client side and he has to save it in a Session so that he can probably create a user session using those credentials.

Zafar Sultan 6-Aug-13 6:06am

Yes sir. I have read it again and again. It says the variable is not available in the current 'context'. Isn't he 'submitting' the form after getting the value at client side for creating user session?

Ankur^\m/ 6-Aug-13 6:16am

Okay, I see. Me is available only on the client. But he is using that variable inside a server side script. So it isn't available there.
Now if he is posting the data back, why is he using Session variable inside a JavaScript code? Bad code there, I must say.

Ankur^\m/ 6-Aug-13 6:25am

I am countering your down vote as I think your suggestion to retrieve the value from hidden field is correct.
Still I think the code that OP has written is bad and needs improvement. If the postback is happening, why assign the value to Session in server tag inside JavaScript function. Instead use a form field (which he is already doing), and use it's value in the Page Load event and assign to the Session.

Zafar Sultan 6-Aug-13 6:37am

Absolutely. There is no need to go that way. But you can't provide the complete solution to them. Thanks.

Zafar Sultan 6-Aug-13 5:57am

And I don't mind down voting...

:-)

Ankur^\m/ 6-Aug-13 6:01am

On the contrary, I do unless it's a valid vote. ;)

Dholakiya Ankit 6-Aug-13 6:41am

yep agree...

sameer.pantvaidya 6-Aug-13 5:36am

Hi Zafar I tried.. but it is setting to blank i.e. "" as I'm assigning it to the label: lblMsg.Text = Session["fbName"].ToString() on next form..

plz help

Zafar Sultan 6-Aug-13 5:39am

What do you mean by next form?

♥…ЯҠ…♥ 6-Aug-13 5:51am

Before assigning the value to session try to log the result like
console.log(me.name);
console.log(auth-displayname.Value);
Then you'll come to know what result is logged in console of your browser....

sameer.pantvaidya 14-Aug-13 1:32am

@Zafar Sultan: Next form means next page

sameer.pantvaidya 14-Aug-13 1:36am

any ways guys thank you for the help.. I sorted out in my way.. I created hidden button's click event and in that(in .cs file) I've added session variables like user name, email etc. WHICH I ASSIGNED TO HIDDENFIELDs in source code..