How to change javascript values to php?

Is it possible to assign values of JavaScript variables to, say, PHP/Ruby/.net variables, without using cookies? What are the various ways to do so?

• For e.g. $myvar = <javascript var>

• Answer:

  Two methods which come to mind are: Passing the variable values via the querystring. This would be the simplest method and fine for integers and short strings. To make this easier you could have a variable manager class on the client and server to add the values onto the querystring of requested urls and to parse them into variables on the server. This is the equivalent of adding client variables to a form as hidden fields and then submitting as a GET request. The drawback here is that you would have an upper limit on the amount of data which could be passed and use of the browser history (e.g. forward and backward buttons) could break your application. Create a server script to accept the variables. This could be called via AJAX from the client in order to keep the server informed of any value changes on the client. It allows for larger amounts of data to be passed, even serialised objects which could be decoded on the server. The service could also be used to pass values from the server to the client. The Drawback with this method is that a failure in the AJAX service could result in the client and server variables becoming out of sync.