php – Symfony2 Ajax Infinite Scroll

我是Symfony2的新手,并不完全理解路由和模板.请帮助解决以下问题：
我需要使用Symfony 2和Ajax实现无限滚动.我有indexController从db获取10个库项目.我希望每次向下滚动时再获得10个项目.
这是控制器：

 /**
 * @Route("/", name="gallery_homepage")
 */
public function indexAction(Request $request)
{
    $em = $this->getDoctrine()
        ->getEntityManager();

    if($request->isXmlHttpRequest())
    {
        $page = $request->get('page', 1);
        $limit = 10;
        $start = $page * $limit - $limit;

        $objects = $em->createqueryBuilder()
            ->select('o')
            ->from('ObjectBundle:Object',  'o')
            ->getQuery()
            ->setFirstResult($start)
            ->setMaxResults($limit)
            ->getResult();

        $response = json_decode($objects);

        return new Response(???));
    }
    else
    {

    }
}

这是树枝模板

{% block body %}
<section class="container">
<ul class="printedall">
    {% for object in objects %}
        <li class="printedimgs">
            <a class="object_prints" href="object.url">
                <img src="object.imageURL"/>
            </a>
        </li>
    {% endfor %}
</ul>
</section>
{% endblock %}

控制器必须返回什么响应才能从db中获取10个项目并将它们附加到显示的项目中？

这是javascript

 is_processing = false;
 last_page = false;
 function addMoreElements() {
     is_processing = true;
     $.ajax({
         type: "GET",
         //FOS Routing
         url: Routing.generate('gallery_homepage', {page: page}),
         success: function(data) {
             if (data.html.length > 0) {
                 $('.printedall').append(data.html);
                 page = page + 1;

            last_page = data.last_page;
        } else {
            last_page = true;
        }
        is_processing = false;
    },
    error: function(data) {
        is_processing = false;
    }
});
 }

 $(window).scroll(function() {
     var wintop = $(window).scrollTop(), docheight = $(document).height(),      winheight = $(window).height();

     var scrolltrigger = 0.80;
     if ((wintop / (docheight - winheight)) > scrolltrigger) {

    if (last_page === false && is_processing === false) {
        addMoreElements();
         }
     }
 });

解决方法:

您可以使用控制器中的Request类,您可以从中获知该请求是否为AJAX.您还必须在查询对象上调用setFirstResult和setMaxResults方法：

use Symfony\Component\HttpFoundation\Response;

// ...

public function indexAction(Request $request) {
    if ($request->isXmlHttpRequest()) {
        //~ Is AJAX Request

        $offset = $request->get('offset');
        $limit = $request->get('limit');

        $em = $this->getDoctrine()
            ->getEntityManager();

        $objects = $em->createqueryBuilder()
            ->select('o')
            ->from('ThreedBundle:Threedobject',  'o')
            ->where('o.status = 2 AND o.showgallery = 1')
            ->getQuery()
            ->setFirstResult($offset)
            ->setMaxResults($limit)
            ->getResult();
    } else {
        //~ Request is not AJAX
    }
}

对于无限滚动,您可以使用任何jquery无限滚动插件：

例如http://infiniteajaxscroll.com/examples/basic/page1.html