如何通过jQuery AJAX在这个Codeigniter应用程序中加载特定数据,而不是整个页面?
我一直在使用CodeIgniter 3.1.8和Twitter Bootstrap 4开发在线newspaper/blogging application。我当前正在使用延迟加载(帖子)功能。
默认情况下,帖子分页并一次显示12个、在http://myblog.com/
、http://myblog.com/?page=2
等等。
在applicationcontrollersPosts.php
我有
private function _initPagination($path, $totalRows, $query_string_segment = 'page')
{
//load and configure pagination
$this->load->library('pagination');
$config['base_url'] = base_url($path);
$config['query_string_segment'] = $query_string_segment;
$config['enable_query_strings'] = TRUE;
$config['reuse_query_string'] = TRUE;
$config['total_rows'] = $totalRows;
$config['per_page'] = 12;
if($this->Static_model->get_static_data()['has_pager']){
$config['display_pages'] = FALSE;
$config['first_link'] = FALSE;
$config['last_link'] = FALSE;
$config['prev_tag_open'] = '<li class="prev">';
$config['prev_tag_close'] = '</li>';
$config['next_tag_open'] = '<li class="next">';
$config['next_tag_close'] = '</li>';
}
if (!isset($_GET[$config['query_string_segment']]) || $_GET[$config['query_string_segment']] < 1) {
$_GET[$config['query_string_segment']] = 1;
}
$this->pagination->initialize($config);
$limit = $config['per_page'];
$offset = ($this->input->get($config['query_string_segment']) - 1) * $limit;
return array(
'limit' => $limit,
'offset' => $offset
);
}
public function index()
{
//call initialization method
$config = $this->_initPagination("/", $this->Posts_model->get_num_rows());
$data = $this->Static_model->get_static_data();
$data['base_url'] = base_url("/");
$data['pages'] = $this->Pages_model->get_pages();
$data['categories'] = $this->Categories_model->get_categories();
$data['search_errors'] = validation_errors();
//use limit and offset returned by _initPaginator method
$data['posts'] = $this->Posts_model->get_posts($config['limit'], $config['offset']);
$this->twig->addGlobal('pagination', $this->pagination->create_links());
// featured posts
if ($data['is_featured']) {
$data['featured'] = $this->Posts_model->featured_posts();
$this->twig->addGlobal('featuredPosts', "themes/{$data['theme_directory']}/partials/hero.twig");
}
$this->twig->display("themes/{$data['theme_directory']}/layout", $data);
}
为了改为通过jQuery AJAX加载帖子,我必须:
(function($) {
var currentPage = 1;
// Hide pahination
$('.pagination').hide();
$(window).scroll(function() {
if ($(window).scrollTop() >= $(document).height() - $(window).height() - 10) {
loadMore();
}
});
function loadMore() {
$.ajax({
url: baseUrl + '?page=' + currentPage,
type: 'POST',
beforeSend: function() {
$('.loader').show();
}
})
.done(function(data) {
$('.loader').hide();
// Append new posts to the posta container
$("#postsContainer").append(data);
currentPage = currentPage + 1;
});
}
})(jQuery);
HTML
<div class="col-lg-8 col-md-10 mx-auto" id="postsContainer">
<div class="post-preview">
<a href="http://myblog.com/learn-to-code-with-us-for-a-better-future">
<h2 class="post-title">Learn to code with us, for a better future</h2>
<h3 class="post-subtitle">Learn to code with us. We have the best teachers in the country.</h3>
</a>
<p class="post-meta">
Posted in <a href="http://myblog.com/categories/posts/1" title="All posts in Uncategorized">Uncategorized</a>, on Nov 19, 2019
</p>
</div>
<hr>
...
</div>
问题
由于某种原因,当我滚动到页面底部时,添加的不是要附加到帖子容器的帖子,而是整个页面。
我的错误在哪里?
解决方案
我得到了一个有效的解决方案:
(function($) {
var currentPage = 2,
maxPage = $('#postsContainer').data('max-page'),
posts = null;
$('.pagination').hide();
$(window).scroll(function() {
var toBottom = $(window).scrollTop() >= $(document).height() - $(window).height() - 25;
if (toBottom && currentPage <= maxPage) {
loadMore();
}
});
function loadMore() {
$.ajax({
url: baseUrl + '?page=' + currentPage,
type: 'GET',
beforeSend: function() {
if (typeof posts != 'undefined') {
$('.loader').show();
}
}
})
.done(function(data) {
$('.loader').hide();
posts = $(data).find('#postsContainer').html();
if (typeof posts != 'undefined') {
$('#postsContainer').append(posts);
currentPage = currentPage + 1;
if (currentPage > maxPage) {
$('#postsContainer').append('<p class="text-center text-muted">No more posts to load</p>');
}
}
});
}
})(jQuery);
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