jquery - How do I post specific json data from php/mysql instead of all data -

i have code working pretty except it's going post of results php want specific json_encoded data. here's php pulls database.

<?php session_start(); $_session['charname'] = 'egahtrac';  require_once ('mysqli_connect.php');  $q = "select * dps charname='" . $_session['charname'] . "';"; $r = mysqli_query($dbc, $q); $row = mysqli_fetch_array($r, mysqli_assoc); $dmg = $row['dmg']; $curr_hp = $row['curr_hp']; $tot_hp = $row['tot_hp']; $attk_spd = $row['attk_spd'];  if ($_server['request_method'] == 'post') {      if (isset($_post['attack'])) {         if ($curr_hp > 0) {             $row['curr_hp'] = $row['curr_hp'] - $row['dmg'];              $q = "update dps set curr_hp='" . $row['curr_hp'] . "' charname='" . $_session['charname'] . "';";             $r = mysqli_query($dbc, $q);              echo json_encode($row);         }     } } 

here's jquery

$('input#attack').on('click', function() {     $.post('dpsloop2.php', { attack: true }, function(data) { $('span#curr_hp').text(data.dmg); }); }); // see here i'm trying test if works echo'ing dmg value curr_hp span see if changes. $('#dpsform').submit( function() {     return false; }); 

i know has .text(data) part. if tried .text(data.curr_hp) doesn't work. i've checked see json array echoing proper format php, why can't access data.curr_hp json array?

in php should call echo json_encode(something) once. json response has single object or array; if want return multiple things, need put them in array. should do:

echo json_encode($curr_hp); 

then need use datatype argument $.post() tell response json. parse you.

$.post('dpsloop2.php', {attack: true }, function(data) {     $('span#curr_hp').text(data); }, 'json'); 

if want return whole row, should be:

echo json_encode($row); 

and js should like:

$.post('dpsloop2.php', {attack: true }, function(data) {     $('span#curr_hp').text(data.curr_hp);     $('span#dmg').text(data.dmg); }, 'json');