How to pass jQuery variables to PHP variable?

How do you pass a variable from jQuery to PHP without a page refresh? When I click on a checkbox I would like to pass a variable from jQuery to PHP. I am also using formdialog.

My PHP code

echo "<input name='opendialog' type='checkbox' class='opendialog' onclick='countChecked()' value=".$taskid." ?>" /> </td>"

my javascript code

function countChecked() {
  var n = $("input:checked").length;

  var allVals = [];
   $('input:checkbox:checked').each(function() {

   $('.sel').text(allVals+' ');

    <?php $taskidj=$rowtask['taskID'];
   // echo "aaa...".$rowtask['taskID']; ?>     



// my jquery code


            bgiframe: true,
            autoOpen: false,
            modal: true,
            width: 700,
            resizable: false,
            open: function(){closedialog = 1;$(document).bind('click', overlayclickclose);},
            focus: function(){closedialog = 0;},
            close: function(){$(document).unbind('click');},
            buttons: {
                Submit: function(){
                var bValid = true;
            //  allFields.removeClass( "ui-state-error" );

            //  bValid = bValid && checkLength( name, "username", 3, 16 );

            //  bValid = bValid && checkRegexp( name, /^[a-z]([0-9a-z_])+$/i, "Username may consist of a-z, 0-9, underscores, begin with a letter." );

                if ( bValid ) {


                        return false;


                Cancel: function() {
                    $( this ).dialog( "close" );
                    $('input[name=opendialog]').attr('checked', false);

    $('.opendialog').click(function() {
            closedialog = 0;


Ajax can do this. Google it, and check out and look at the ajax functions, .ajax(), .post(), .get(), .load(), etc.

As for your specific question, here is what you would do:

//Javascript file
$("input[type=checkbox]").click(function () {
   $.post('my_ajax_receiver.php', 'val=' + $(this).val(), function (response) {

//PHP file my_ajax_receiver.php
   $value = $_POST['val'];
   echo "I got your value! $value";

Need Your Help

How can I shrink the drawable on a button?

android scale compound-drawables

how can I make the drawable on a button smaller? The icon is too big, actually higher than the button. This is the code I am using:

Read a file line by line in reverse order

java file text log4j

I have a java ee application where I use a servlet to print a log file created with log4j. When reading log files you are usually looking for the last log line and therefore the servlet would be much