web,js瀑布流揭秘
瀑布流再很久之前流行,可能如我一样入行晚的 ,可能就没有机会去使用。但是这个技术终究是个挺炫酷的东西,花了一个上午来研究,用原生js实现了一个,下面会附上源码,供大家解读。
说起瀑布流,其实实现原理特别简单,而且方法有很多,现在说一个大众的方法,所谓瀑布流就是 一堆样式差不多的 盒子排列在一起,排列规则是,插入到高度最低的那一列,所以,实现起来就很简单了,布局分 块,页面分列,计算每一列的高度,然后把块插入到列高度低的那一列,设置定位,left和top值就好了。
1.从布局开始,基本布局如下:
<div id="main">
<div class="box"><div class="fig"><img src="xxxx"></div></div>
</div>
main为父级大容器,用来盛放 块 box,所有的box都一样的
2.style样式,基本样式如下:
*{padding: 0; margin: 0; box-sizing: border-box; -webkit-transition: all .3s;}
#main{
position: relative; //因为box要绝对定位,所以给父级设置相对定位
}
.box{
padding: 10px 5px 5px 10px;
float: left;
}
.fig{border: 1px #ccc solid; border-radius: 4px; box-shadow: 0 0 5px rgba(0,0,0,.6); padding: 5px;}
.fig img{width: 200px;}
3. 主要js如下:
1 ;(function ($){View Code
2
3
4 function show(el){
5 el.style.display = 'block';
6 }
7 function hide(el){
8 el.style.display = 'none';
9 }
10
11 function getById(id){
12 return document.getElementById(id);
13 }
14
15 function getByClass(name,parent){
16 var parent = parent ? document.getElementById(parent) : document;
17 var eles = document.getElementsByTagName('*');
18 var result = [];
19 for(var i=0, len = eles.length; i < len; i++){
20 if(eles[i].className == name){
21 result.push(eles[i]);
22 }
23 }
24 return result;
25 }
26
27 function getIndex(arr,val){
28 for(var i in arr){
29 if(arr[i] == val){
30 return i;
31 }
32 }
33 return -1;
34 }
35
36
37 var elMark = getById('Mark');
38 var baseUrl = "./images/";
39 var dataImg = {
40 "data" : [
41 {"src": '1.jpg'},
42 {"src": '2.jpg'},
43 {"src": '3.jpg'},
44 {"src": '4.jpg'},
45 {"src": '5.jpg'},
46 {"src": '6.jpg'},
47 {"src": '7.jpg'},
48 {"src": '8.jpg'},
49 {"src": '9.jpg'},
50 {"src": '10.jpg'},
51 {"src": '1.jpg'},
52 {"src": '2.jpg'},
53 {"src": '3.jpg'},
54 {"src": '4.jpg'},
55 {"src": '5.jpg'},
56 {"src": '6.jpg'},
57 {"src": '7.jpg'},
58 {"src": '8.jpg'},
59 {"src": '9.jpg'},
60 {"src": '10.jpg'}
61 ]
62 }
63
64 function WaterFull(insName){
65 this.instance = insName;
66 this.wrap = '';
67 this.box = '';
68 this.elwrap = '';
69 }
70 WaterFull.prototype = {
71 init : function (parent, box){
72 this.wrap = parent;
73 this.box = box;
74 this.elwrap = getById(parent);
75 this.insertHtml();
76 },
77 insertHtml : function (){
78 show(elMark);
79 var self = this;
80 for(var i=0, len = dataImg.data.length; i < len; i++){
81 var url = baseUrl + dataImg.data[i].src;
82 self.elwrap.appendChild(self.creatHtml(url));
83 }
84 setTimeout(function (){
85 self.setPosition();
86 hide(elMark);
87 },400);
88 },
89 creatHtml : function (url){
90 var box = document.createElement('div');
91 box.className = this.box;
92 var fig = document.createElement('div');
93 fig.className = 'fig';
94 box.appendChild(fig);
95 var img = new Image();
96 img.src = url;
97 fig.appendChild(img);
98 return box;
99 },
100 setPosition : function (){
101 var hArr = [];
102 var boxs = getByClass(this.box, this.wrap);
103 var boxW = boxs[0].offsetWidth;
104 var cols = Math.floor(document.body.clientWidth / boxW);
105 this.elwrap.style.cssText = 'width: '+cols*boxW+'px;'+'margin: 0 auto;';
106 for(var i=0, len = boxs.length; i < len; i++){
107 if(i<cols){
108 boxs[i].style.position = 'static';
109 hArr.push(boxs[i].offsetHeight);
110 }else{
111 var minH = Math.min.apply(null, hArr);
112 var colsIndex = getIndex(hArr, minH)
113 if(colsIndex == -1){
114 alert("查询失败");
115 return false;
116 }
117 boxs[i].style.cssText = "position: absolute; top: "+minH+"px;"+"left: "+boxW*colsIndex+"px";
118 hArr[colsIndex] += boxs[i].offsetHeight;
119 }
120 }
121 },
122 checkLoad : function (){
123 var boxs = getByClass(this.box, this.wrap);
124 var lastH = boxs[boxs.length -1].offsetTop + boxs[boxs.length -1].offsetHeight;
125 var loadH = document.documentElement.clientHeight + document.body.scrollTop || document.documentElement.scrollTop;
126 return lastH < loadH;
127 }
128 }
129
130 function main(){
131 var waterfull = new WaterFull();
132 waterfull.init('main','box');
133 window.onscroll = function (){
134 if(waterfull.checkLoad.call(waterfull)){
135 waterfull.insertHtml.call(waterfull);
136 }
137 }
138 window.onresize = function (){
139 waterfull.setPosition.call(waterfull);
140 }
141 }
142
143 $.main = main;
144
145 }(this))
全部js都在,如果需要全套代码的 ,麻烦联系我一下哈,QQ号:309093631
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