Pass a value from javascript to c#

I need to retrieve a value calculated using javascript back to my c# code.

The javascript code is here:

      function calculateShipping(){            
            var numberTotal = new NumberFormat( parseFloat(Shipping.value) + parseFloat(subTotal) );
            numberTotal.setPlaces(2);
            
            totalPrice.innerHTML = baseCurrency + numberTotal.toFormatted();
      }

I need to pass the numerTotal back to c# when an imagebutton is clicked on a page.

Thanks!!
infodiggerAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

ZvonkoSystems architectCommented:
That is NOT possible.
C# is running ONCE before the page is displayed to browser on web server side. When the C# has finished and all the output html page source text is flushed to browser, then is the browser starting to render the html page and run any embedded script in the page html text.
The script on the browser page cannot access  ANYTHING on web server side.
All the a browser can do to server is to request a new URL to be loaded into page or submit form data that unloads the actual window content.
The only exception that browser cand do is use hidden techniques, like iframe communication in the background, or AJAX, or <img> or Image() object manipulation that do call another aspx web server page in the background.
So your image click can have an image src attribute set in that way that some aspx page on server side is called to update the Session variables to the new calculated Total.

But why do you want do that at all! At next postback are all form fields submitted anyway. So put your Total in some hidden field and fetch it from there at next post back when you do the next recalculation for that page.



0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Cyber-DrugsCommented:
One possible way is with an AJAX Call...

Make AJAX call a page, eg:

www.yoursite.com/getvalue.aspx?myvalue=1234

Where:

"getvalue.aspx" is a c# page to retreive your JS value
"myvalue" is the POST variable to hold your value
"1234" is your POST value

Have AJAX call that page, but do not bother to display it. I do this method with PHP quite often, if you like I can pull out the code I use for this to help you along.

Hope that helps.
0
Cyber-DrugsCommented:
And after further reading Zvonko's reply, I see her mentioned the same thing... sorry Zvonko :o)
0
Ultimate Tool Kit for Technology Solution Provider

Broken down into practical pointers and step-by-step instructions, the IT Service Excellence Tool Kit delivers expert advice for technology solution providers. Get your free copy now.

ZvonkoSystems architectCommented:
No problem :)
0
infodiggerAuthor Commented:
Thank you all for your help!
0
ZvonkoSystems architectCommented:
You are welcome.
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
C#

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.