网页瀑布流布局实现方法及功能扩展

2013年2月22日16:57:33Web前端评论1K阅读模式

现在这种布局已经不能叫瀑布流了，我们称之为格子块，格子块通过算法智能堆砌。

到最后，说点下睛也好，说添下足也好，我们再加一个拖动交换格子的效果。

<!doctype html>
<html>
<head>
<meta charset="UTF-8" />
<title>宽高尺寸不同的格子堆砌(可拖动换位)</title>
<style>
body{background:#F6F7F8;}
.myWidget{position:relative;overflow:hidden;zoom:1;margin:0 auto;}
.MBox{float:left;}
.widgetBox{position:relative;overflow:hidden;zoom:1;width:186px;height:166px;margin:6px;border:1px solid #E1E1E3;cursor:move;
border-radius:10px;
-moz-border-radius:10px;
-webkit-border-radius:10px;
box-shadow:2px 3px 5px #d3d3d3;
-moz-box-shadow:2px 3px 5px #d3d3d3;
-webkit-box-shadow:2px 3px 5px #d3d3d3;
filter:progid:DXImageTransform.Microsoft.gradient(startColorstr=#fefefe, endColorstr=#e0e0e2);
background: linear-gradient(top, #fefefe, #f6f6f6 ,#f3f3f3,#f2f2f2,#e0e0e2);
background: -moz-linear-gradient(top, #fefefe, #f6f6f6 ,#f3f3f3,#f2f2f2,#e0e0e2);
background: -webkit-gradient(linear, 0 0, 0 100% , from(#fefefe),to(#e0e0e2));
background: -webkit-linear-gradient(0 0, #fefefe, #f6f6f6 ,#f3f3f3,#f2f2f2,#e0e0e2);
}
</style>
<script>
var $id = function(o){ return document.getElementById(o) || o ;};
var getElementsByClassName = function(className,parent,tag) {
parent = parent || document;
if(parent.getElementsByClassName){
return parent.getElementsByClassName(className)
}else{
tag = tag || '*';
var returnElements = []
var els = parent.getElementsByTagName(tag);
className = className.replace(/\-/g, "\\-");
var pattern = new RegExp("(^|\\s)"+className+"(\\s|$)");
var i = 0;
while(i < els.length){
if (pattern.test(els[i].className) ) {
returnElements.push(els[i]);
}
i++;
}
return returnElements;
}
};
var Util = new Object();
Util.getOffset = function (el, isLeft) {
var retValue = 0;
// while (el != null) {
retValue += el["offset" + (isLeft ? "Left" : "Top")];
// el = el.offsetParent;
//}
return retValue;
};
Util.bindFunction = function (el, fucName) {
return function () {
return el[fucName].apply(el, arguments);
};
};
Util.re_calcOff = function (el) {
for (var i = 0; i < Util.dragArray.length; i++) {
var ele = Util.dragArray[i];
ele.elm.pagePosLeft = Util.getOffset(ele.elm, true);
ele.elm.pagePosTop = Util.getOffset(ele.elm, false);
}
var nextSib = el.elm.nextSibling;
while (nextSib) {
nextSib.pagePosTop -= el.elm.offsetHeight;
nextSib = nextSib.nextSibling;
}
};
Util.hide = function () {
Util.rootElement.style.display = "none";
};
Util.show = function () {
Util.rootElement.style.display = "";
};
ghostElement = null;
found = null;
getGhostElement = function () {
if (!ghostElement) {
ghostElement = document.createElement("DIV");
ghostElement.className = "MBox ghostBox";
}
return ghostElement;
};
function draggable(el) {
this._dragStart = start_Drag;
this._drag = when_Drag;
this._dragEnd = end_Drag;
this._afterDrag = after_Drag;
this.isDragging = false;
this.elm = el;
this.hasIFrame = this.elm.getElementsByTagName("IFRAME").length > 0;
Drag.init(el, this.elm);
this.elm.onDragStart = Util.bindFunction(this, "_dragStart");
this.elm.onDrag = Util.bindFunction(this, "_drag");
this.elm.onDragEnd = Util.bindFunction(this, "_dragEnd");
};
function start_Drag() {
Util.re_calcOff(this);
this.origNextSibling = this.elm.nextSibling;
var _ghostElement = getGhostElement();
var offH = this.elm.offsetHeight;
var offW = this.elm.offsetWidth;
var offLeft = Util.getOffset(this.elm, true);
var offTop = Util.getOffset(this.elm, false);
// Util.hide();
//this.elm.parentNode.getElementsByTagName('iframe')[0].style.visibility = 'hidden';
this.elm.style.width = offW + "px";
_ghostElement.style.height = offH + "px";
_ghostElement.style.width = offW + "px";
this.elm.parentNode.insertBefore(_ghostElement, this.elm.nextSibling);
this.elm.style.position = "absolute";
this.elm.style.zIndex = 100;
this.elm.style.left = offLeft + "px";
this.elm.style.top = offTop + "px";
//Util.show();
this.isDragging = false;
return false;
};
function when_Drag(clientX, clientY) {
if (!this.isDragging) {
this.elm.style.filter = "alpha(opacity=70)";
this.elm.style.opacity = 0.7;
this.isDragging = true;
}
found = null;
var max_distance = 100000000;
for (var i = 0; i < Util.dragArray.length; i++) {
var ele = Util.dragArray[i];
var distance = Math.sqrt(Math.pow(clientX - ele.elm.pagePosLeft, 2) + Math.pow(clientY - ele.elm.offsetTop, 2));
if (ele == this) {
continue;
}
if (isNaN(distance)) {
continue;
}
if (distance < max_distance) {
max_distance = distance;
found = ele;
}
};
var _ghostElement = getGhostElement();
if (found != null) {
if(this.elm.pagePosLeft < clientX){
found.elm.parentNode.insertBefore(_ghostElement, found.elm.nextSibling);
}else{
found.elm.parentNode.insertBefore(_ghostElement, found.elm);
}
};
};
function end_Drag() {
//this.elm.parentNode.getElementsByTagName('iframe')[0].style.visibility = 'visible';
if (this._afterDrag()) {
}
return true;
};
function after_Drag() {
var returnValue = false;
// Util.hide();
this.elm.style.position = "";
this.elm.style.width = "";
this.elm.style.zIndex = "";
this.elm.style.filter = "";
this.elm.style.opacity = "";
var ele = getGhostElement();
if (ele.nextSibling != this.origNextSibling) {
ele.parentNode.insertBefore(found.elm, this.elm);
ele.parentNode.insertBefore(this.elm, ele.nextSibling);
returnValue = true;
}
ele.parentNode.removeChild(ele);
//Util.show();
box.init(Util.rootElement);
return returnValue;
};
var Drag = {
obj:null,
init:function (elementHeader, element) {
elementHeader.onmousedown = Drag.start;
elementHeader.obj = element;
if (isNaN(parseInt(element.style.left))) {
element.style.left = "0px";
}
if (isNaN(parseInt(element.style.top))) {
element.style.top = "0px";
}
element.onDragStart = new Function();
element.onDragEnd = new Function();
element.onDrag = new Function();
},
start:function (event) {
var element = Drag.obj = this.obj;
event = Drag.fixE(event);
if (event.which != 1) {
return true;
}
element.onDragStart();
element.lastMouseX = event.clientX;
element.lastMouseY = event.clientY;
document.onmouseup = Drag.end;
document.onmousemove = Drag.drag;
return false;
},
drag:function (event) {
event = Drag.fixE(event);
if (event.which == 0) {
return Drag.end();
}
var element = Drag.obj;
var _clientX = event.clientY;
var _clientY = event.clientX;
if (element.lastMouseX == _clientY && element.lastMouseY == _clientX) {
return false;
};
if(_clientX + document.documentElement.scrollTop + document.body.scrollTop < 0 || _clientX > document.documentElement.offsetHeight){
return false;
};
var sTo=0;
if( _clientX < 0 ){
sTo=_clientX;
};
if((_clientX - document.documentElement.clientHeight) > 0){
sTo=_clientX - document.documentElement.clientHeight;
};
window.scrollBy(0,sTo);
var _lastX = parseInt(element.style.top);
var _lastY = parseInt(element.style.left);
var newX, newY;
newX = _lastY + _clientY - element.lastMouseX;
newY = _lastX + _clientX - element.lastMouseY;
element.style.left = newX + "px";
element.style.top = newY + sTo + "px";
element.lastMouseX = _clientY;
element.lastMouseY = _clientX;
element.onDrag(newX, newY);
return false;
},
end:function (event) {
event = Drag.fixE(event);
document.onmousemove = null;
document.onmouseup = null;
var _onDragEndFuc = Drag.obj.onDragEnd();
Drag.obj = null;
return _onDragEndFuc;
},
fixE:function (ig_) {
if (typeof ig_ == "undefined") {
ig_ = window.event;
}
if (typeof ig_.layerX == "undefined") {
ig_.layerX = ig_.offsetX;
}
if (typeof ig_.layerY == "undefined") {
ig_.layerY = ig_.offsetY;
}
if (typeof ig_.which == "undefined") {
ig_.which = ig_.button;
}
return ig_;
}
};
var initDrag = function (el) {
Util.rootElement = el;
Util.elem = Util.rootElement.children;
Util.dragArray = new Array();
var counter = 0;
for (var i = 0; i < Util.elem.length; i++) {
var elem = Util.elem[i];
Util.dragArray
0
+
网站访问量
= new draggable(elem);
counter++;
};
box.setIfr(Util.rootElement);
box.init(Util.rootElement);
};
/* 格子排序 */
var box={};
box.gen={w:200,h:180};
box.init=function(el){
box.size=[]; //格子,[1,2]表示1X2的大格子
box.obj={};
box.oArray=[];
box.maxY=-1;
box.mbox = getElementsByClassName("MBox",el,'div');
box.row = document.documentElement.offsetWidth / box.gen.w >> 0; //每行标准格数
el.style.width = box.row * box.gen.w + "px";
var i = 0 , nx, ny;
while( i < this.mbox.length){
if( getElementsByClassName("bigBox",this.mbox[i],'div').length > 0 ){
nx=Math.ceil(this.mbox[i].offsetWidth / this.gen.w);
nx=(nx > this.row) ? this.row : nx; //大小超出限制
ny=Math.ceil(this.mbox[i].offsetHeight / this.gen.h);
this.size.push([nx,ny]);
}else{
this.size.push(1);
}
i++;
}
box.sort(el);
};
box.setIfr=function(el){ //大格子初始化
var ifr = getElementsByClassName("bigBox",el,'div');;
if(ifr.length==0) return false;
var i = 0, nx, ny, theifr;
while(i < ifr.length){
theifr = getElementsByClassName("innerBox",ifr[i],'div');
nx=Math.ceil(theifr[0].offsetWidth / this.gen.w); //bigBox横向占的块数
ny=Math.ceil(theifr[0].offsetHeight / this.gen.h);
ifr[i].style.width = nx*this.gen.w-14 + 'px' ;
ifr[i].style.height = ny*this.gen.h-14 + 'px' ;
i++;
}
};
box.sort=function(el){
var y=0, x=0, temp={x:Infinity, y:Infinity}, flag=Infinity, name;
for(var n=0; n < this.size.length ; n++){
if(flag == 0){
x=temp.x;
y=temp.y;
}
flag=flag-1;
if(x > box.row-1){ //换行
x=0;
y++;
}
name=x+'_'+y; //对象属性名（反映占领的格子）
if(this.hasN(name)) { //判断属性名是否存在
n--;
x++;
if(flag<Infinity) flag=flag+1;
continue;
}
if(!this.size[n].length){ //普通格子
this.obj[name]=[x,y]; //（反映坐标值）
x++;
}
else{ //大格子
if(this.over(x,y,n)) {
if(temp.y > y){
temp.y = y;
temp.x = x;
}
if(temp.y < Infinity){
flag=1;
}
n--;
x++;
continue;
}
this.obj[name]=[x,y];
this.apply(x,y,n);
x+=this.size[n][0];
}
if(flag==-1) {
flag = Infinity;
temp.y = Infinity;
temp.x = Infinity;
}
var h=this.size[n][1]-1 || 0;
box.maxY=(box.maxY > y+h)? box.maxY : y+h;
}
for(var i in this.obj){
if(this.obj[i]===0 || !this.obj.hasOwnProperty(i)) continue;
this.oArray.push(this.obj[i]);
}
box.put(el);
};
box.hasN=function(n){
return n in this.obj;
};
box.over=function(x,y,n){ //判断是否会重叠
var name;
if(x+this.size[n][0] > this.row) return true; //超出显示范围
for(var k=1; k<this.size[n][1];k++){
name=x+'_'+(y-0+k);
if(this.hasN(name)) {return true;} //左侧一列有无重叠
}
for(k=1; k<this.size[n][0];k++){
name=(x-0+k)+'_'+y;
if(this.hasN(name)) {return true;} //上侧一行有无重叠
}
return false;
};
box.apply=function(x,y,n){ //大格子中多占的位置
var posX=x, //大格子左上角位置
posY=y;
for(var t=0; t<this.size[n][0]; t++) {
for(var k=0; k<this.size[n][1]; k++){
name=(posX+t)+'_'+(posY+k);
if(t==0 && k==0) { continue; }
this.obj[name]=0; //多占的格子无坐标值
}
}
};
box.put=function(el){
var x,y;
for(var i =0;i< this.oArray.length; i++){
x=box.gen.w*this.oArray[i][0];
y=box.gen.h*this.oArray[i][1];
box.mbox[i].style.cssText = "position:absolute;left:"+ x +"px;top:" + y + "px;";
};
el.style.height= box.gen.h*(box.maxY+1) +'px';
};
</script>
</head>
<body>
<div id="myWidget" class="myWidget"></div>
<script>
var myWidget = $id("myWidget");
//创建随机内容
var content = '';
for(i = 0; i < 20; i++) {
if(!(Math.random()*5 >> 0)){
height = Math.floor(Math.random()*200 + 100);
width = Math.floor(Math.random()*200 + 100);
content += '<div class="MBox"><div class="widgetBox bigBox"><div style="width:' + width +'px;height:' + height +'px;margin:0 auto;" class="innerBox">'+ i +'</div></div></div>';
}else{
content += '<div class="MBox"><div class="widgetBox">'+ i +'</div></div>';
}
};
myWidget.innerHTML = content;
//绑定拖动元素
initDrag(myWidget);
window.onresize = function(){box.init(myWidget)};
</script>
</body>
</html>