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jQuery實現(xiàn)瀑布流的取巧做法分享

 更新時間：2015年01月12日 11:30:04   投稿：hebedich  
這篇文章主要介紹了jQuery實現(xiàn)瀑布流的取巧做法分享,需要的朋友可以參考下

分析：瀑布流，做法有2種

（1）絕對定位方案：每個單元格設置為絕對定位，通過計算，分別設置 top , left 即可實現(xiàn)

（2）浮動方案：弄N列布局（浮動），然后圖片數(shù)據(jù)，按順序依次插入，如N為3列 ，第一張圖片插入到第一列，第二張圖片插入到第二列，第三張圖片插入到第三列，第四張圖片插入到第一列........這樣循環(huán)插入（不能自適應）

CSS與HTML代碼：

復制代碼 代碼如下:

　　body,ul,li{margin:0;margin:0;}
    ul{list-style:none;}
    .clearfix:after{visibility:hidden;display:block;font-size:0;content:" ";clear:both; height:0;}.clearfix{*zoom:1}
    /*瀑布流*/
    .wallList{width:860px;}
    .wallList li{float:left;display:inline;margin-right:16px;}
    .wallList li a{background:#eee;border:1px solid #ccc;padding:5px 5px 0 5px;display:block;margin-bottom:10px;}
    .wallList li a:hover{border-color:#f60;}
    .wallList li .name{display:block;text-align:center;padding:8px 0;}
    .loadTips{text-align:center;padding:15px 0;}

復制代碼 代碼如下:

<div class="wallList" id="wallList">
        <ul class="clearfix">
            <li></li>
            <li></li>
            <li></li>
        </ul>
        <p class="loadTips" id="loadTips"><span>正在加載......</span></p>
</div>

使用jQuery實現(xiàn)，大概思路如下：

　?。?）獲取N列中 最小的高度值，JS提供的API是Math.min()，但這個API最多只能傳入 2 個參數(shù)，所以就需要用aplly來擴展，Math.min.apply(null,[xxx,xxx,xxxx,xxxx])
　?。?）給 window 綁定 scroll事件，下拉的時候獲取 $(document).scrollTop() ， 當 $(document).scrollTop() 大于 最小的高度值，就ajax請求url，如果有數(shù)據(jù)，就往頁面插入HTML結(jié)構，沒有則提示 “加載完”，然后window解綁此事件

復制代碼 代碼如下:

// 數(shù)據(jù)格式
    var testJson = {
        "status":1,
        "data":[
            {"href":"http:xxxxxxx","src":"             {"href":"http:xxxxxxx","src":"             {"href":"http:xxxxxxx","src":"             {"href":"http:xxxxxxx","src":"             {"href":"http:xxxxxxx","src":"             {"href":"http:xxxxxxx","src":"             {"href":"http:xxxxxxx","src":"             {"href":"http:xxxxxxx","src":"             {"href":"http:xxxxxxx","src":"             {"href":"http:xxxxxxx","src":"             {"href":"http:xxxxxxx","src":"             {"href":"http:xxxxxxx","src":"             {"href":"http:xxxxxxx","src":"             {"href":"http:xxxxxxx","src":"             {"href":"http:xxxxxxx","src":"             {"href":"http:xxxxxxx","src":"             {"href":"http:xxxxxxx","src":"             {"href":"http:xxxxxxx","src":"             {"href":"http:xxxxxxx","src":"             {"href":"http:xxxxxxx","src":"             {"href":"http:xxxxxxx","src":"             {"href":"http:xxxxxxx","src":"             {"href":"http:xxxxxxx","src":"             {"href":"http:xxxxxxx","src":"             {"href":"http:xxxxxxx","src":"             {"href":"http:xxxxxxx","src":"             {"href":"http:xxxxxxx","src":"             {"href":"http:xxxxxxx","src":"             {"href":"http:xxxxxxx","src":"             {"href":"http:xxxxxxx","src":"         ]
    }
    var wallPic = function(){
        var $target = $('#wallList'),
            $li = $target.find('li'),
            $tips = $('#loadTips'),
            oTop = 0,//滾動判斷的值
            row = 3,//列數(shù)
            page = 1,//ajax請求的頁碼值
            url = 'xxxx', //ajax請求地址
            on_off = true; //插入結(jié)構的開關，防止ajax錯誤性多次加載數(shù)據(jù)
        return{
            fillData:function(callback){
                var _that = this;
                on_off = false;
                /* ajax
                --------------------*/
                // $.get(url,{ page:page,count:30 },function(json){
                //     if(json.status==1){
                //         _that.appendHTML(json.data);
                //         on_off = true;
                //         page++;
                //     }else{
                //         _that.loadedTips();
                //     }
                // },'json');
                /* 模擬測試-設置定時器模擬ajax請求數(shù)據(jù)
                -----------------------*/
                setTimeout(function(){
                    // 模擬終止
                    if(page==3){
                        _that.loadedTips();
                        return;
                    }
                    _that.appendHTML(testJson.data);
                    on_off = true;
                    page++;                   
                },400);
            },
            appendHTML:function(data){
                var len = data.length,
                    n = 0;
                for(;n<len;n++){
                    var k = 0;
                    n>(row-1)?k=n%row:k=n;
                    $li[k].innerHTML += '<a href="'+data[n].href+'" target="_blank"><img src="'+data[n].src+'" width="'+data[n].width+'" height="'+data[n].height+'" alt="'+data[n].name+'" /><span class="name">'+data[n].name+'</span></a>';
                }
                this.getOTop();
            },
            getOTop:function(){
                oTop = Math.min.apply(null,[$li.eq(0).height(),$li.eq(1).height(),$li.eq(2).height()])+$target.offset().top;
            },
            loadedTips:function(){
                $('#loadTips').find('span').text('數(shù)據(jù)已加載完');
                setTimeout(function(){
                    $('#loadTips').css({'visibility':'hidden'});
                },200);
                // 解綁事件
                $(window).unbind('scroll',$.proxy(this.scrollEvent,this));
            },
            scrollEvent:function(){
                if($(document).scrollTop()+$(window).height()>oTop&&on_off){
                    this.fillData();                       
                }
            },
            init:function(){
                this.fillData();
                $(window).bind('scroll',$.proxy(this.scrollEvent,this));
            }
        }
    }();
    wallPic.init();

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