onchange="$.get('set_item.php?stockID='.$row[stockID].'&push='+this.checked);"

$(document).ready(function () {

$('#selectChb').click(function(){
     $(':checkbox').prop("checked", true);
});

$(":checkbox:checked").each(function() {
    str = this.val();
    $.get('set_item.php?stockID='+str+'&push='+this.checked);
});

$(":checkbox:not(:checked)").each(function() {
    str = this.val();
    $.get('set_item.php?stockID='+str+'&push='+this.checked);
});

});

$(document).ready(function () {

    $('#selectChb').click(function(){
        $(':checkbox').prop("checked", true);
    });

    $(":checkbox").on("change", function() {
        if($(this).is(":checked"))
        {
            str = $(this).val();
            $.get('set_item.php?stockID='+str+'&push='+this.checked);
        }
    });
});