Ajax请求在滚动页面时加载内容

Question

我已经尝试过但没有找到...我怎样才能改变我用on()方法编写的以下方法？

//Get old posts when scrolling down
$(window).scroll(function(){
  if($(window).scrollTop()==($(document).height()-$(window).height())){
    //Get older posts
    $.ajax({
        type: 'POST',
        url: 'action/getoldposts.php',
        success: function(oldposts){
            //Append #postsDiv
            $('#postsDiv').append(oldposts);
        }
    });
  } 
});

提前致谢!

丹尼斯

更新1

我将代码更改为以下内容,但是随后创建的内容没有功能 - 我是否缺少一些静态引用？

$(window).on('scroll',function(){
  if($(window).scrollTop()==($(document).height()-$(window).height())){
    //Get older posts
    $.ajax({
        type: 'POST',
        url: 'action/getoldposts.php',
        success: function(oldposts){
            //Append #postsDiv
            $('#postsDiv').append(oldposts);
        }
    });
  } 
});

更新2

动态创建的元素错过了以下功能:

$('#postsDiv').on('keydown', '.commenttext', function(e) {
    if ((e.which == 13) && !e.shiftKey) {
        comment($(this));
        return false;
    }
});

方法comment()如下所示:

//Function to comment on a post
function comment(commenttext)
{
//Get postid
var commenttextid=commenttext.attr('id');
var postid=commenttextid.replace("commenttext", "");

//Get commenttext
var commenttext=$('#commenttext'+postid).val();

//Ajax of commenttext is not empty
if(commenttext!="")
{
    $.ajax({
        type: 'POST',
        url: 'action/comment.php',
        data: 'commenttext='+commenttext+'&postid='+postid,
        success: function(data){

            //Prepend comments
            $('#comments'+postid).hide().prepend(
                '<div class="comment"><hr/>'+commenttext.replace( /\n/g, '<br/>' )+'</div'
            ).fadeIn('slow');

            //Remove from textarea what was typed in
            $('#commenttext'+postid).val('');

            //Focus on textarea
            $('#commenttext'+postid).focus();
        }
    }).error(function(){
        alert('The comment could not be sent - please try again later.');
    });
}
else
{
    //If the commenttext is empty, focus on the textarea nonetheless
    $('#commenttext'+postid).focus();
}
}

评论被附加到新加载的内容,但显然错过了ajax,因为当我重新加载页面时,它不再存在.

Answer 1

1)几天前我做了类似的代码.在这里,我将页面滚动事件分配给一个函数,该函数检查用户离底部多少像素.如果用户的像素少于300或更少,则会触发loadMoreArticles()函数:

$(document).scroll(function(){
        if(($(document).height()-$(window).height()-$(document).scrollTop()) < 300){
            console.log('Scrolled to bottom');
            ArticleList.loadMoreArticles();
        } else {
            console.log('Scroll '+$(document).height()+' - '+$(window).height()+' - ' +$(document).scrollTop());
        }
    });

console.log()函数显示它以正确的方式实现

2)您可以在添加新内容后再次添加功能.像这样:

$(window).on('scroll',function(){
  if($(window).scrollTop()==($(document).height()-$(window).height())){
    //Get older posts
    $.ajax({
        type: 'POST',
        url: 'action/getoldposts.php',
        success: function(oldposts){
            //Append #postsDiv
            $('#postsDiv').append(oldposts);
            //Remove all functionalities
            $('#postsDiv').off('keydown');
            //Add all functionalities again
            $('#postsDiv').on('keydown', '.commenttext', function(e) {
                if ((e.which == 13) && !e.shiftKey) {
                    comment($(this));
                    return false;
                }
            });
        }
    });
  } 
});