JSON decode php problems - php

Question

I have index.php and getting problem with to decode the json array.. please help i am new to this..
<script>
$(document).ready(function () {
$("#slider_price").slider({
range: true,
min: 0,
max: 100,
step: 1,
values: [0, 100],
slide: function (event, ui) {
$("#app_min_price").text(ui.values[0] + "$");
$("#app_max_price").text(ui.values[1] + "$");
},
stop: function (event, ui) {
var nr_total = getresults(ui.values[0], ui.values[1]);
$("#results").text(nr_total);
},
});
$("#app_min_price").text($("#slider_price").slider("values", 0) + "$");
$("#app_max_price").text($("#slider_price").slider("values", 1) + "$");
});
function getresults(min_price, max_price) {
var number_of_estates = 0;
$.ajax({
type: "POST",
url: 'search_ajax.php',
dataType: 'json',
data: {
'minprice': min_price,
'maxprice': max_price
},
async: false,
success: function (data) {
number_of_estates = data;
}
});
return number_of_estates;
}
And search_ajax.php
<?php
require_once('includes/commonFunctions.php');
// take the estates from the table named "Estates"
if(isset($_POST['minprice']) && isset($_POST['maxprice']))
{
$minprice = filter_var($_POST['minprice'] , FILTER_VALIDATE_INT);
$maxprice = filter_var($_POST['maxprice'] , FILTER_VALIDATE_INT);
$query = mysql_query("SELECT * FROM cars WHERE min_range >= $minprice AND max_range <= $maxprice");
$rows = array();
while($r = mysql_fetch_assoc($query)) {
$rows[] = $r;
}
echo json_encode($rows);
}
?>
and the problem is i just want to print $rows in specific div "number_results".. how to decode that json array?

Answer 1

are you sure about the data you are passing is in json format
i think it should be
'{"minprice": "min_price", "maxprice":"max_price"}'

Answer 2

you cannot just return ajax returned value from a function since ajax is async...the function will already return number_of_estates , by the time ajax call completes.
use callback or just call a function and append your returned text there
..
stop: function( event, ui ) {
getresults(ui.values[0], ui.values[1]);
},
...
function getresults(min_price, max_price)
{
var number_of_estates = 0;
$.ajax({
type: "POST",
url: 'search_ajax.php',
dataType: 'json',
data: {'minprice': min_price, 'maxprice':max_price},
async: false,
success: function(data)
{
number_of_estates = data;
$("#results").text(number_of_estates);
}
});
}
however ajax is called each time the stop funnction occurs so be careful.