javascript – 如何使用CodeIgniter在Ajax中对数组进行切片以进行分页？
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我在我的模块的视图页面中有一个foreach循环,它从控制器中检索图像网格(数字由“items_top”确定).问题是所有项目都是同时加载的,因为此刻没有设置分页.
这是我的观点代码：
<div class="row row-sm padder-lg ">
<?php
foreach ($top->tracks->track as $key => $value)
{
if($key >= $this->config->item("items_top"))
return false;
$image = $value->image[3]->text;
if($image == '')
$image = $value->image[2]->text;
if($image == '')
$image = base_url()."assets/images/no-cover.png";
?>
<div class="col-xs-6 col-sm-4 col-md-3 col-lg-2">
<div class="item">
<div class="pos-rlt">
<a href="#">
<div class="item-overlay opacity r r-2x bg-black">
<div class="center text-center m-t-n">
<i class="icon-control-play i-2x"></i>
</div>
</div>
<a href="#">
<div class="r r-2x img-full" style="background:url('<?php echo $image; ?>') no-repeat top center; -webkit-background-size: cover; -moz-background-size: cover; -o-background-size: cover; background-size: cover;">
<div style="height:180px;overflow:hidden;"></div>
</div>
</a>
</div>
<div class="padder-v">
<a href="#" class="text-ellipsis"><?php echo $value->name; ?></a>
<a href="#" class="text-ellipsis text-xs text-muted"><?php echo $value->artist->name; ?></a>
</div>
</div>
</div>
<?php
}
?>
<script>
$(".nav-sidebar li").removeClass("active");
$("#topTrack").addClass('active');
</script>
</div>
这是我的功能助手：
function _curl($url) {
$CI =& get_instance();
$ch = curl_init();
curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,15);
curl_setopt($ch,CURLOPT_FOLLOWLOCATION,1);
if(strtolower(parse_url($url, PHP_URL_SCHEME)) == 'https')
{
curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,1);
curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,1);
}
if($CI->config->item("proxy") != '')
{
curl_setopt($ch, CURLOPT_PROXY, $CI->config->item("proxy"));
}
curl_setopt($ch, CURLOPT_URL, $url);
$data = curl_exec($ch);
curl_close($ch);
return $data;
}
function getTopTracks($artist = false)
{
$CI =& get_instance();
$artist = econde($artist);
$url = "http://ws.audioscrobbler.com/2.0/?method=chart.gettoptracks&api_key=".$CI->config->item("lastfm")."&format=json&limit=60&page=3";
$file_cache = 'cache/tracks_'.sha1("toptracks").".cache";
if($cache)
{
$json = $cache;
if (time()-filemtime($file_cache) > 24 * 3600) {
// file older than 24 hours
@unlink($file_cache);
}
}
else
{
$json = _curl($url);
if($CI->config->item("use_cache") == "1")
write_file($file_cache, $json);
}
if(!$artist)
$json = str_ireplace("toptracks","tracks",$json);
else
$json = remove_banned($json,true) ;
$json = str_ireplace("#text","text",$json);
$json = str_ireplace(":totalResults","",$json);
return remove_banned($json) ;
}
这是我的控制器：
public function getTopTracks($return = false,$page = false)
{
$data['page'] = $page;
$data['top'] = json_decode(getTopTracks());
if(count($data['top']->tracks->track) <=1)
{
$this->config->set_item("auto_country", '0');
$data['top'] = json_decode(getTopTracks());
}
return $this->load->view(getTemplate('topTracks'),$data,$return);
}
我需要切片循环来对这些项进行分页,我想能够在底部添加一个“加载更多”按钮,但问题是Ajax,我不能使用$page =(int)getFromExternalInput();因为循环调用公共函数而不是url.
切片这个循环的正确方法是什么？
解决方法:
I edited the function helper in my question with the code asked
for…hope this could be helpful for an answer. Thanks
好的,根据您的附加信息更新我的答案,我根据新信息创建了一个工作示例.我曾经为自己创建了一个沙盒,它不会100％地反映你的代码.我觉得你应该能够从这个答案中得到一些东西,你应该能够在你自己的代码中实现它.
代码确实需要一些优化
我将缓存的文件保存在/ application / cache / lastfm中
缓存在这里可能是一个分页的问题,但我尽力提出一个工作示例
应用/配置/ lastfm.php
$config['url'] = 'http://ws.audioscrobbler.com/2.0/';
/**
*
*/
$config['API_KEY'] = '';
/**
*
*/
$config['limit'] = 12;
/**
*
*/
$config['cache_time'] = 24 * 3600;
/**
*
*/
$config['proxy'] = "";
应用/库/ curl.php
class Curl
{
protected $handle;
public function __construct()
{
$this->_init();
}
/**
*
* @return type
*/
protected function _init()
{
if(!in_array('curl', get_loaded_extensions()))
return log_message('error', 'curl extension is not loaded!');
$this->handle = curl_init();
if(!$this->handle) {
return log_message('error', 'could not create curl handle!');
}
}
/**
*
* @param type $url
* @return type
*/
public function fetch($url)
{
$this->setOptions($url);
$response = curl_exec($this->handle);
if($errno = curl_errno($this->handle)){
log_message('error', 'Curl Response Error: ' . curl_strerror($errno));
}
curl_close($this->handle);
return ($errno === 0) ? $response : false;
}
/**
*
* @param type $url
* @return type
*/
protected function setOptions($url)
{
if(strtolower(parse_url($url, PHP_URL_SCHEME)) == "https"){
curl_setopt($this->handle, CURLOPT_SSL_VERIFYPEER, 1);
curl_setopt($this->handle, CURLOPT_SSL_VERIFYHOST, 1);
}
$proxy = $this->config->item('proxy', 'lastfm');
if(!empty($proxy)){
curl_setopt($this->handle, CURLOPT_PROXY, $proxy);
}
curl_setopt($this->handle,CURLOPT_FAILONERROR,true);
curl_setopt($this->handle, CURLOPT_RETURNTRANSFER, true);
curl_setopt($this->handle, CURLOPT_URL, $url);
return;
}
/**
*
* @param type $name
* @return type
*/
public function __get($name)
{
$instance =&get_instance();
return $instance->$name;
}
}
应用/控制器/ tracks.php
class Tracks extends App_Controller
{
public function __construct()
{
parent::__construct();
$this->load->config('lastfm', true);
$this->load->model('lastfm_model');
}
public function index()
{
$tracks = $this->lastfm_model->getTracks(1);
$this->load->view($this->template, array(
'content' => 'lastfm/tracks',
'tracks_view' => $this->load->view('lastfm/partials/tracks', array(
'tracks' => $tracks,
'statistics' => $tracks['data']->tracks->attr
), true)
));
}
public function get($pageId=0)
{
$tracks = $this->lastfm_model->getTracks($pageId, true);
if($pageId > $tracks['data']->tracks->attr->totalPages){
return;
}
$this->load->view('lastfm/partials/tracks', array(
'tracks' => $tracks,
'statistics' => $tracks['data']->tracks->attr
));
}
}
应用程序/模型/ lastfm_model.php
class LastFM_Model extends CI_Model
{
/**
*
* @var type
*/
protected $options;
/**
*
* @var type
*/
protected $cache;
/**
*
* @var type
*/
protected $method;
/**
*
* @var type
*/
protected $byPassCache = false;
public function __construct()
{
parent::__construct();
$this->options = $this->config->config['lastfm'];
}
/**
*
* @param type $page
*/
public function getTracks($page=0, $bypass_cache=false, $method='chart.gettoptracks')
{
$this->method = $method;
$this->cache = $this->_getCachePath();
$this->byPassCache = $bypass_cache;
$url= $this->_buildUrl($page);
if($bypass_cache){
return array(
'src' => 'curl',
'data' => $this->_parseContent($this->_fetch($url), false)
);
}
if($cache = $this->_getCache()){
return array(
'src' => 'cache',
'data' => $this->_parseContent($cache)
);
}
return array(
'src' => 'curl',
'data' => $this->_parseContent($this->_fetch($url), false)
);
}
/**
*
* @param type $page
* @return type
*/
protected function _buildUrl($page=0)
{
$query_data = array(
'method' => $this->method,
'format' => 'json',
'page' => $page,
'limit' => $this->options['limit'],
'api_key' => $this->options['API_KEY']
);
$query = http_build_query($query_data);
return $this->options['url'] . '?' . $query;
}
/**
*
* @param type $url
* @return type
*/
protected function _fetch($url)
{
$this->load->library('curl');
$data = $this->curl->fetch($url);
$data = str_ireplace(array('#text', '@attr'), array('text', 'attr'), $data);
if(!$this->byPassCache){
$this->_setCache($data);
}
return ($data) ? $data : false;
}
/**
*
* @return type
*/
protected function _getCachePath()
{
return APPPATH . "cache/lastfm/{$this->method}.cache";
}
/**
*
* @param type $data
* @return type
*/
protected function _setCache($data)
{
if(file_exists($this->cache)){
unlink($this->cache);
}
if(!empty($data)){
return file_put_contents($this->cache, $data);
}
}
/**
*
* @return type
*/
protected function _getCache()
{
return ( file_exists($this->cache) && ( time() - filemtime($this->cache) ) < $this->options['cache_time'] )
? $this->cache
: false;
}
/**
*
* @param type $content
* @param type $cache
* @return type
*/
protected function _parseContent($content, $cache=true)
{
if($cache)
$content = file_get_contents($content);
return json_decode($content);
}
}
应用/视图/ LastFM等/ tracks.php
<div id="track_list">
<?php echo $tracks_view; ?>
</div>
<script>
var SITE_URL = "<?php echo site_url();?>";
</script>
<script>
/** LastFm **/
(function($){
var lastFm = {
/**
*
* @type type
*/
options : {
cache : false,
url : undefined,
type : "GET",
dataType : "html",
data : {}
},
/**
*
* @returns {undefined}
*/
init : function(){
this.More = $("a#more");
this.trackList = $("#track_list");
this.trackList.on('click', this.More, $.proxy(this.handleEventClick, this));
},
/**
*
* @param {type} event
* @returns {undefined}
*/
handleEventClick : function(event){
event.preventDefault();
var target, pageId;
target = event.target;
pageId = parseInt($(target).attr('data-pageId'));
$(target).remove();
this.pageID = pageId+1;
this.fetch(this.pageID);
},
/**
*
* @returns {undefined}
*/
fetch : function(pageId){
this.options.url = SITE_URL + "/tracks/get/"+pageId;
this.dojax().then(
$.proxy(this.handleResponse, this),
$.proxy(this.handleErrors, this)
);
},
/**
*
* @returns {unresolved}
*/
dojax : function(){
return $.ajax(this.options).promise();
},
/**
*
* @param {type} response
* @returns {undefined}
*/
handleResponse : function(response){
this.More.remove();
this.trackList.append(response);
$("html, body").animate({
scrollTop : $("[data-pageSlideId="+this.pageID+"]").filter(':last').offset().top
});
},
/**
*
* @param {type} error
* @returns {undefined}
*/
handleErrors : function(error){
}
};
lastFm.init();
}(jQuery));
</script>
应用/视图/ LastFM等/分音/ tracks.php
<div id="page_<?php echo $statistics->page;?>">
<?php
$columnsPerRow = 4;
foreach(array_chunk($tracks['data']->tracks->track, $columnsPerRow) as $track): ?>
<div class="row" data-pageSlideId="<?php echo $statistics->page;?>">
<?php foreach($track as $trac):?>
<?php $image = (!empty($trac->image[2]->text)) ? $trac->image[2]->text : false;?>
<div class="large-3 medium-6 columns text-center" >
<div class="panel" style="background: url('<?php echo $image;?>') no-repeat;background-size: cover;">
<h6><?php echo $trac->name;?></h6>
<h5><?php echo $trac->artist->name;?></h5>
</div>
</div>
<?php endforeach;?>
</div>
<?php endforeach; ?>
</div>
<div class="row">
<div class="large-12 columns text-center">
<a href="" class="button" id="more" data-pageId="<?php echo $statistics->page;?>">Load More...</a>
</div>
</div>
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