瀑布流的实践1

根据张鑫旭的http://www.zhangxinxu.com/wordpress/2012/03/%E5%A4%9A%E6%A0%8F%E5%88%97%E8%A1%A8%E5%8E%9F%E7%90%86%E4%B8%8B%E5%AE%9E%E7%8E%B0%E7%9A%84%E7%80%91%E5%B8%83%E6%B5%81%E5%B8%83%E5%B1%80-waterfall-layout/

而来，我有修改他的代码，修改了他的refresh这部分代码。

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>瀑布流布局测试</title>
<style>
body {
    background-color: #eee;
    font-size: 84%;
    text-align: justify;
}
.column {
    /*display: inline-block;*/
    vertical-align: top;
    margin:0 5px;
    float: left;
}
.pic_a {
    display: block;
    padding: 5px;
    margin-bottom: 10px;
    border: 1px solid #ccc;
    background-color: #fff;
    text-decoration: none;
}
.pic_a img {
    display: block;
    margin: 0 auto 5px;
    border: 0;
    vertical-align: bottom;
}
.pic_a strong {
    color: #333;
}
</style>
</head>

<body>
<div id="container"></div>
<script type="text/javascript" src="http://a.tbcdn.cn/apps/tmm/activity/2013/0725seven_love/zepto.js"></script>
<script>
var waterFall = {
    container: document.getElementById("container"),
    // 栏的个数
    columnNumber: 1,
    // 栏的宽度
    columnWidth: 210,
    // 栏之间的margin
    columnMargin: 10,
    // P_001.jpg ~ P_160.jpg
    rootImage: "http://cued.xunlei.com/demos/publ/img/",
    // indexImage用来表示当前第几张图片
    indexImage: 0,

    scrollTop: document.documentElement.scrollTop || document.body.scrollTop,
    detectLeft: 0,

    loadFinish: false,

    // 返回固定格式的图片名
    getIndex: function() {
        var index = this.indexImage;
        if (index < 10) {
            index = "00" + index;
        } else if (index < 100) {
            index = "0" + index;
        }
        return index;
    },

    // 是否滚动载入的检测
    appendDetect: function() {
        var start = 0;
        for (start; start < this.columnNumber; start++) {
            var eleColumn = document.getElementById("waterFallColumn_" + start);
            if (eleColumn && !this.loadFinish) {
                if (eleColumn.offsetTop + eleColumn.clientHeight < this.scrollTop + (window.innerHeight || document.documentElement.clientHeight)) {
                    this.append(eleColumn);
                }
            }
        }

        return this;
    },

    // 滚动载入
    append: function(column) {
        this.indexImage += 1;
        var html = '', index = this.getIndex(), imgUrl = this.rootImage + "P_" + index + ".jpg";

        // 图片尺寸
        var aEle = document.createElement("a");
        aEle.href = "###";
        aEle.className = "pic_a";
        aEle.innerHTML = '<img src="'+ imgUrl +'" /><strong>'+ index +'</strong>';
        column.appendChild(aEle);

        if (index >= 160) {
            //alert("图片加载光光了！");
            this.loadFinish = true;
        }

        return this;
    },

    // 页面加载初始创建
    create: function() {
        // 根据刚进入页面时的浏览器宽度，分配栏的个数
        this.columnNumber = Math.floor(document.body.clientWidth / this.columnWidth);

        // start是当前第几栏，作为循环的标志变量用；
        var start = 0, htmlColumn = '', self = this;
        for (start; start < this.columnNumber; start+=1) {
            htmlColumn = htmlColumn + '<span id="waterFallColumn_'+ start +'" class="column" style="width:'+ this.columnWidth +'px;">'+
                function() {
                    var html = '', i = 0;
                    for (i=0; i<5; i+=1) {
                        // self.indexImage用来表示当前第几张图片，通过 当前第几栏和栏数和栏数里面的第几张 来获取
                        self.indexImage = start + self.columnNumber * i;
                        var index = self.getIndex();
                        html = html + '<a href="###" class="pic_a"><img src="'+ self.rootImage + "P_" + index +'.jpg" /><strong>'+ index +'</strong></a>';
                    }
                    return html;
                }() +
            '</span> ';
        }
        // waterFallDetect元素用来判断浏览器宽度变化，通过waterFallDetect元素的左偏移量来判断。
        htmlColumn += '<span id="waterFallDetect" class="column" style="width:'+ this.columnWidth +'px;"></span>';

        this.container.innerHTML = htmlColumn;

        this.detectLeft = document.getElementById("waterFallDetect").offsetLeft;
        return this;
    },

    refresh: function() {
        var arrHtml = [], arrTemp = [], htmlAll = '', start = 0, maxLength = 0;
        for (start; start < this.columnNumber; start++) {
            // span标签里面的所有anchor元素,并放入数组
            var arrColumn = document.getElementById("waterFallColumn_" + start).innerHTML.match(/<a(?:.|\n|\r|\s)*?a>/gi);
            if (arrColumn) {
                maxLength = Math.max(maxLength, arrColumn.length);
                // arrTemp是一个二维数组
                arrTemp.push(arrColumn);
            }
        }

        // 需要重新排序
        var lengthStart, arrStart;
        for (lengthStart = 0; lengthStart<maxLength; lengthStart++) {
            for (arrStart = 0; arrStart<this.columnNumber; arrStart++) {
                if (arrTemp[arrStart][lengthStart]) {
                    arrHtml.push(arrTemp[arrStart][lengthStart]);
                }
            }
        }
        console.log(arrHtml)

        if(arrHtml && arrHtml.length !== 0 ){
            // 新栏个数
            this.columnNumber = Math.floor(document.body.clientWidth / (this.columnWidth+this.columnMargin));

            // 向下取整
            var new_arrHtml = [];
            for(var i=0; i < this.columnNumber; i++){
                // var new_arrHtml_arr = [];
                new_arrHtml.push([]);
            }
            for(var j=0, l = arrHtml.length; j< l; j++){
                // var j_new = j+1;
                var new_arrHtml_pos = j % this.columnNumber;
                new_arrHtml[new_arrHtml_pos].push(arrHtml[j]);
            }
            console.log(new_arrHtml);

            // 重新组装HTML
            var newStart = 0, htmlColumn = '', self = this, column_arr = [];
            for(var i=0, l= this.columnNumber; i < l; i++){
                htmlColumn = htmlColumn + '<span id="waterFallColumn_'+ i +'" class="column" style="width:'+ this.columnWidth +'px;">'+
                new_arrHtml[i].join("") +
                '</span>';
                // console.log(new_arrHtml[i].join(""))
            }
            htmlColumn += '<span id="waterFallDetect" class="column" style="width:'+ this.columnWidth +'px;"></span>';
            // debugger;
            this.container.innerHTML = htmlColumn;

            this.detectLeft = document.getElementById("waterFallDetect").offsetLeft;

            // 检测
            this.appendDetect();

        }
        return this;
    },

    // 滚动加载
    scroll: function() {
        var self = this;
        window.onscroll = function() {
            // 为提高性能，滚动前后距离大于100像素再处理
            var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;
            if (!this.loadFinish && Math.abs(scrollTop - self.scrollTop) > 100) {
                self.scrollTop = scrollTop;
                self.appendDetect();
            }

        };
        return this;
    },

    // 浏览器窗口大小变换
    resize: function() {
        var self = this;
        window.onresize = function() {
            var eleDetect = document.getElementById("waterFallDetect"), detectLeft = eleDetect && eleDetect.offsetLeft;
            if (detectLeft && Math.abs(detectLeft - self.detectLeft) > 10) {
                // 检测标签偏移异常，认为布局要改变
                self.refresh();
            }
        };
        return this;
    },
    init: function() {
        if (this.container) {
            this.create().scroll().resize();
        }
    }
};
waterFall.init();
</script>
</body>
</html>

 

posted @ 2014-01-13 14:22  草珊瑚  阅读(294)  评论(0)  编辑  收藏  举报