asp.net - update session variable on textbox_change without postback -

is there way save textbox text session variable without having postback on text change?

you need in 4 stages.

1) add onkeydown="textchanged(this.id);" textbox

2) use javascript capture text

3) fire ajax call web method

4) use web method store session variable.

so this:

on textbox, set autopostback=false don't post on typing.

create small javascript function fired when user types.

this function first clear timer attached textbox. create 1 fire function after 1 second. ensure you're not trying fire end function often.

 function textchanged(id) {         var txtbox = document.getelementbyid(id);         cleartimeout(txtbox.timer);         txtbox.timer = settimeout('savevariable()', 1000);     }; 

after 1 second, method call this:

function savevariable(){        // ajax call in here , send textbox value web method         var t = // getyourtextboxtexthere         if (t != "") {             $.ajax({                 type: "post",                 url: "yourpage.aspx/savemytextvar",                 data: "{'texttosave ': '" + escape(t) + "'}",                 contenttype: "application/json; charset=utf-8",                 datatype: "json",                 success: function (msg) {                     if (!msg.d) {                         // didn't save                     } else {                         // saved fine , dandy                     };                 }             });         }; } 

finally, small web method on code behind capture text

<scriptmethod(responseformat:=responseformat.json)> <services.webmethod()> _ public shared function savemytextvar(byval texttosave string) boolean          '' save variable session here.          '' return true or false          '' can capture returning result in ajax calls method end function