ajax加载瀑布流图片

最新推荐文章于 2025-09-09 18:53:59 发布

转载最新推荐文章于 2025-09-09 18:53:59 发布 · 76 阅读

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CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/yanwen2015/p/4864552.html

文章标签：

#php #json

本文介绍了一种通过AJAX获取图片列表并实现滚动加载功能的技术，包括HTML、CSS、JavaScript和PHP的综合应用。

<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<style>
body {margin: 0;}
#ul1 {width: 1080px; margin: 100px auto 0;}
li { width: 247px; list-style: none; float: left; margin-right: 10px; }
li div {border: 1px solid #000; padding: 10px; margin-bottom: 10px;}
li div img { width: 225px; display: block;}
</style>
<script src="ajax.js"></script>
<script>
window.onload = function() {
    
    var oUl = document.getElementById('ul1');
    var aLi = oUl.getElementsByTagName('li');
    var iLen = aLi.length;
    var iPage = 1;
    var b = true;
    
    //初始化数据处理
    getList();
    
    function getList() {
        ajax('get','getPics.php','cpage=' + iPage,function(data) {
        
            var data = JSON.parse(data);
            
            if ( !data.length ) {
                //后续没有数据了
                return ;
            }
            
            for ( var i=0; i<data.length; i++ ) {
                
                //获取高度最短的li
                var _index = getShort();
                
                var oDiv = document.createElement('div');
                var oImg = document.createElement('img');
                oImg.src = data[i].preview;
                oImg.style.width = '225px';
                oImg.style.height =  data[i].height * ( 225 / data[i].width ) + 'px';
                oDiv.appendChild( oImg );
                var oP = document.createElement('p');
                oP.innerHTML = data[i].title;
                oDiv.appendChild( oP );
                
                aLi[_index].appendChild( oDiv );
                
            }
            
            b = true;
            
        });
    }
    
    window.onscroll = function() {
        
        var _index = getShort();
        var oLi = aLi[_index];
        
        var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;
        
        if ( getTop( oLi ) + oLi.offsetHeight < document.documentElement.clientHeight + scrollTop ) {
            
            if ( b ) {
                b = false;
                iPage++;
                getList();
            }
            
        }
        
    }
    
    function getShort() {
        var index = 0;
        var ih = aLi[index].offsetHeight;
        for (var i=1; i<iLen; i++) {
            if ( aLi[i].offsetHeight < ih ) {
                index = i;
                ih = aLi[i].offsetHeight;
            }
        }
        return index;
    }
    
    function getTop(obj) {
        var iTop = 0;
        while(obj) {
            iTop += obj.offsetTop;
            obj = obj.offsetParent;
        }
        return iTop;
    }
    
}
</script>
</head>

<body>
    <ul id="ul1">
        <li></li>
          <li></li>
        <li></li>
        <li></li>
    </ul>
</body>
</html>

ajax.js

function ajax(method, url, data, success) {
    var xhr = null;
    try {
        xhr = new XMLHttpRequest();
    } catch (e) {
        xhr = new ActiveXObject('Microsoft.XMLHTTP');
    }
    
    if (method == 'get' && data) {
        url += '?' + data;
    }
    
    xhr.open(method,url,true);
    if (method == 'get') {
        xhr.send();
    } else {
        xhr.setRequestHeader('content-type', 'application/x-www-form-urlencoded');
        xhr.send(data);
    }
    
    xhr.onreadystatechange = function() {
        
        if ( xhr.readyState == 4 ) {
            if ( xhr.status == 200 ) {
                success && success(xhr.responseText);
            } else {
                alert('出错了,Err：' + xhr.status);
            }
        }
        
    }
}

getPics.php

<?php
header('Content-type:text/html; charset="utf-8"');

/*
API:
    getPics.php

        参数
        cpage : 获取数据的页数
*/
$cpage = isset($_GET['cpage']) ? $_GET['cpage'] : 1;

$url = 'http://www.wookmark.com/api/json/popular?page=' . $cpage;

$content = file_get_contents($url);
$content = iconv('gbk', 'utf-8', $content);

echo $content;

?>