Codeigniter：将数据保存到会话并使用Ajax显示它

Question

I ran into issue with sessions and ajax. I have this peace of code:

for ($i=0; $i < count($result); $i++) {
    if(in_array($result[$i], $m_lines_arr)) {
        echo "<p class='br' style='color:   #ffffff'>Match on comb. $i</p>";
        $win = 10;
        $this->session->set_userdata( array('win' => $win));
    }
    else {
        echo "<p class='br'>No match on comb. $i</p>";
    }
}

So, if something is in array, give $win value 10 and save it do session, otherwise just do simple echo. In my function win I try to echo this session. Here is the sample of function win:

function win() {
    $win = $this->input->post('win');
    echo $this->session->userdata('win');
}

Function win comes after the for loop, just for you to know.

And here is the Ajax request:

var win = $('#win span').html();
$.ajax({
    type: 'POST',
    url: 'http://localhost/slots/index.php/game/win',
    data: { win: win },
    success:function(response) {
        $('#win span').html(response);
    }
});

The problem is, I can't display data stored in session in real time, I must refresh page to get the result. Any clue?

Answer 1

function win() {
    echo $win = $this->input->post('win');
    // $this->session->userdata('win'); i don't think you need this if it's real time
}

but i prefer usually:

function win() {
    $win = $this->input->post('win');
    echo json_encode( array('win'=>$win));
}

then in ajax:

$.ajax({
 //...
dataType:'json',
 success:function(json){
 alert(json.win);
}
});

NB, VERY VERY IMPORTANT, the session must be setted BEFORE any output, so here you are setting session after the output:

 echo "<p class='br' style='color:   #ffffff'>Match on comb. $i</p>";
        $win = 10;
        $this->session->set_userdata( array('win' => $win));

do this:

$win = 10;
 $this->session->set_userdata( array('win' => $win)); //for better performance you must call this out from the loop
echo ."<p class='br' style='color:   #ffffff'>Match on comb. $i</p>";


    then in ajax:

$.ajax({
 //
success:function(response){
 alert(response);
}
});