Set a code behind property from javascript/clientside in ASP.NET Webforms

Question

Pretty straightforward:

Clientside in javascript function, it is pretty simple to set a javascript variable to something in the code behind such as:

var testing = '<%= Me.SomePropInCodeBehind %>';

Can I do the opposite?

Something like : <% Me.SomePropInCodeBehind %> = "Foo";

Adil · Accepted Answer · 2013-10-22 15:27:20Z

3

It is not possible to set server side property like from javascript alone. You need to do postback or send ajax request to update the server side variable.

Server side code generates the html / javascript and send to the client. The value of property is set in html like a string literal and sent to client. Server side (asp.net) variable does not exists on client (javascript).

You can assign javascript value to some hidden field and get that hidden field on server to assign value to property if you want to do it through postback. If you want to do it with jQuery ajax you can pass pass the values in data in jQuery ajax() function. If you only need to update some value on server you better choose ajax to prevent whole page refresh.

edited Oct 22, 2013 at 15:27

answered Oct 22, 2013 at 15:20

Adil

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2 Comments

Douglas Barbin Over a year ago

And just to add, most would consider Ajax to be preferable to a postback (unless you need to re-render the entire page, for some reason)

Jason Renaldo Over a year ago

Thanks, I figured as much be appreciate the definitive answer. Will check as answer when allowed.

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