How can I do this query in CodeIgniter - php

Question

this is the controller method
public function ajaxLoad()
{
$data['query'] = $this->db->query("SELECT * FROM items ORDER BY id DESC");
$data['content'] = $this->load->view('item', $data, true);
$data = json_encode($data);
echo $data;
}
and this is the js that invokes ajax
var tempScrollTop, currentScrollTop = 0;
$(document).scroll(function(){
currentScrollTop = $(document).scrollTop();
if (tempScrollTop < currentScrollTop )
{
var result = currentScrollTop % 100;
if(result == 0)
{
$.ajax({
url: "ajax/load",
type: "POST",
success: function(res){
$("#content").html(res);
}
});
}
}
else if (tempScrollTop > currentScrollTop )
{
var result = currentScrollTop % 100;
if(result == 0)
{
$("#content").text("Вверх запрос " + result);
}
}
tempScrollTop = currentScrollTop;
})
the problem i that i can't get the part of a page with the query that goes in the content and then json_encode to transfer to javascript, if i remove the
$data['query'] = $this->db->query("SELECT * FROM items ORDER BY id DESC");
and change this to
$data['content'] = $this->load->view('item', null, true);
thus without the $data object its ok.
then its comes empty, but i need the database rows to display in the content
how can i solve this problem??
and the echo $data; - its the only way to transfer the data to js??, i tried return $data;, but that doesn't work :(
and also the main problem is that the PHP generates the page with the foreach function that generates records by loop, but if i put one of those records with ajax will the variables inside that partial become values of the database query??, or i need to set the values with js??
i am confused about that, sorry if i am wrong, can you help me???
so this is how looks the page generated by php by when the pages loads:
<? $i = 1 ?>
<? foreach($query->result() as $q): ?>
<?
$milliseconds = $q->end;
//echo $dd;
//echo time();
/*
$year = date('y', $t);
$month = date('m', $t);
$day = date('d', $t);
$hour = date('h', $t);
$minute = date('i', $t);
$second = date('s', $t);
*/
$d = new Datecalc;
$begin = date("Y-m-d H:i:s");
$end = date($q->end);
#$date = $d->dateDiff($begin , $end);
//$begin = strtotime($begin);
//$end = strtotime($q->end);
$d->dateDiff($begin, $end);
//echo $d->day;
$desc = substr($q->desc, 0, 225);
if(strlen($desc) > 180)
{
$desc = $desc."...";
}
?>
<input type="hidden" value="<?= $milliseconds ?>" id="milliseconds_<?= $q->id ?>" />
<div class="item" id="item_<?= $q->id ?>">
<? if(!empty($_SESSION['role']) && $_SESSION['role'] == 'admin'): ?>
<div class="admin_delete">
<?= img('css/img/admin_delete.png'); ?>
</div>
<? endif; ?>
<div class="desc">
<span class="discount">Скидка <?= $q->discount ?>%</span>
<span class="desc"><?= $desc ?></span>
</div>
<div class="item_pic">
<? $attr = array('src' => $q->image,
'id' => 'item_pic',
'class' => 'item_pic') ?>
<?= img($attr) ?>
</div>
<div class="menu_3">
<ul class="menu_3">
<li class="timer">
<? $attr = array('src' => 'css/img/time.png',
'class' => 'time') ?>
<?= img($attr) ?>
<span id="days_<?= $q->id?>"><?= $d->day ?></span>д.
<span id="hours_<?= $q->id?>"><?= $d->hour ?></span> :
<span id="minutes_<?= $q->id?>"><?= $d->min ?></span> :
<span id="seconds_<?= $q->id?>"><?= $d->sec ?></span>
</li>
<li class="price">
<?= $q->price ?>с.
</li>
<li class="buy">
<div class="small">
99
</div>
<a href="<?= base_url() ?>buy/<?= $q->id ?>">
<?= img('css/img/kupit.png') ?>
</li>
<li class="item_arrow">
<?= img('css/img/item_arrow.png') ?>
<? if($i % 2 == 0): ?>
<ul class="submenu2">
<? else: ?>
<ul class="submenu2">
<? endif; ?>
<li>
<a href="<?= base_url() ?>show/<?= $q->id ?>">
Подробнее
</a>
</li>
<li>
Как это работает
</li>
<li style="border-bottom: none;">
Рассказать друзьям
</li>
<li style="border-bottom: none;">
<?= img('css/img/namba.png') ?>
<?= img('css/img/mail_ru.png') ?>
<?= img('css/img/odnoklassniki.png') ?>
<?= img('css/img/vkontakte.png') ?>
<?= img('css/img/facebook.png') ?>
</li>
</ul>
</li>
</ul>
</div>
</div>
<? $i++; ?>
<? endforeach; ?>
<div class="clear"></div>
i dont know how to put the records by ajax separately gradualy when the user scrolls down

Answer 1

Try rewriting these two lines
$data['query'] = $this->db->query("SELECT * FROM items ORDER BY id DESC");
$data['content'] = $this->load->view('item', $data, true);
as
$db_data['query'] = $this->db->query("SELECT * FROM items ORDER BY id DESC");
$data['content'] = $this->load->view('item', $db_data, true);
As it is, you are sending, as part of the JSON output, the query response from the DB (in the $data array). Then replace the last two lines with
echo json_encode($data);