基于zepto.js实现仿手机QQ空间的大图查看组件ImageView.js详解
调用方式 :ImageView(index,imgData) --index参数 为图片默认显示的索引值，类型 为Number --imaData参数 为图片url数组 ，类型为Array
使用之前要先引入 zepto.js 文件
ImageView.js具体代码如下：
代码如下:
/*
* ImageView v1.0.0
* --基于zepto.js的大图查看
* --调用方法 ImageView(index,imgDada)
* --index 图片默认值显示索引,Number --imgData 图片url数组,Array
* */
var ImageView=(function(window,$){
var _this=$("#slideView"),_ImgData=[],_index=0,_length=0,
_start=[],_org=[],_orgTime=null,
_lastTapDate=null,
_zoom=1,_zoomXY=[0,0],_transX=null,
_advancedSupport = false,
_doubleDistOrg=1,_doubleZoomOrg=1,isDoubleZoom = false,
isSlide=true,isDrag=false,timer=null,
winW=window.innerWidth,winH=window.innerHeight;
/**
* 事件对象 event
*/
var Event={
touchstart:function(e){
e.preventDefault();
if (_advancedSupport && e.touches && e.touches.length >= 2) {
var img = getImg();
$(img).css({"-webkit-transitionDuration": "0ms","transitionDuration": "0ms"});
_doubleZoomOrg = _zoom;
_doubleDistOrg = getDist(e.touches[0].pageX, e.touches[0].pageY, e.touches[1].pageX, e.touches[1].pageY);
isDoubleZoom = true;
return
}
e = e.touches ? e.touches[0] : e;
isDoubleZoom = false;
_start = [e.pageX, e.pageY];
_org = [e.pageX, e.pageY];
_orgTime = Date.now();
_transX = -_index * winW;
if(_zoom!=1){
_zoomXY = _zoomXY || [0, 0];
_orgZoomXY = [_zoomXY[0], _zoomXY[1]];
var img = getImg();
img&&($(img).css({"-webkit-transitionDuration": "0ms","transitionDuration": "0ms"}));
isDrag = true
}else{
_this.find(".pv-inner").css({"-webkit-transitionDuration":"0ms","transitionDuration":"0ms"});
isSlide = true
}
},
touchmove:function(e){
e.preventDefault();
if (_advancedSupport && e.touches && e.touches.length >= 2) {
var newDist = getDist(e.touches[0].pageX, e.touches[0].pageY, e.touches[1].pageX, e.touches[1].pageY);
_zoom = (newDist/_doubleDistOrg) * _doubleZoomOrg
var img = getImg();
$(img).css({"-webkit-transitionDuration": "0ms","transitionDuration": "0ms"});
if (_zoom < 1) {
_zoom = 1;
_zoomXY = [0, 0];
$(img).css({"-webkit-transitionDuration": "200ms","transitionDuration": "200ms"})
} else if (_zoom >getScale(img) * 2){
_zoom = getScale(img) * 2;
}
$(img).css({"-webkit-transform": "scale(" + _zoom + ") translate(" + _zoomXY[0] + "px," + _zoomXY[1] + "px)","transform": "scale(" + _zoom + ") translate(" + _zoomXY[0] + "px," + _zoomXY[1] + "px)"});
return
}
if (isDoubleZoom){
return;
}
e = e.touches ? e.touches[0] : e;
if (_zoom != 1) {
var deltaX = (e.pageX - _start[0]) / _zoom;
var deltaY = (e.pageY - _start[1]) / _zoom;
_start = [e.pageX, e.pageY];
var img = getImg();
var newWidth = img.clientWidth *_zoom,
newHeight = img.clientHeight * _zoom;
var borderX = (newWidth - winW) / 2 / _zoom,
borderY = (newHeight - winH) / 2 / _zoom;
(borderX >= 0)&&(_zoomXY[0] < -borderX || _zoomXY[0] > borderX)&&(deltaX /= 3);
(borderY > 0)&&(_zoomXY[1] < -borderY || _zoomXY[1] > borderY)&&(deltaY /= 3);
_zoomXY[0] += deltaX;
_zoomXY[1] += deltaY;
(_length == 1 && newWidth < winW||newWidth < winW)&&(_zoomXY[0] = 0);
(_length == 1 && newHeight < winH||newHeight < winH)&&(_zoomXY[1] = 0);
$(img).css({"-webkit-transform": "scale(" + _zoom + ") translate(" + _zoomXY[0] +
"px," + _zoomXY[1] + "px)","transform": "scale(" + _zoom + ") translate(" + _zoomXY[0] +
"px," + _zoomXY[1] + "px)"})
}else{
if (!isSlide) return;
var deltaX = e.pageX - _start[0];
(_transX > 0 || _transX < -winW * (_length - 1))&&(deltaX /= 4);
_transX = -_index * winW + deltaX;
_this.find(".pv-inner").css({"-webkit-transform":"translate(" + _transX + "px,0px) translateZ(0)"});
}
},
touchend:function(e){
if (isDoubleZoom) {
return;
}
if (_zoom != 1) {
if (!isDrag){return;}
var img = getImg();
var newWidth = img.clientWidth *_zoom,
newHeight = img.clientHeight * _zoom;
var borderX = (newWidth - winW) / 2 / _zoom,
borderY = (newHeight - winH) / 2 / _zoom;
if (_length > 1 && borderX >= 0) {
var updateDelta = 0;
var switchDelta = winW / 6;
if (_zoomXY[0] < -borderX - switchDelta / _zoom && _index < _length - 1){
updateDelta = 1;
}else if (_zoomXY[0] > borderX + switchDelta / _zoom && _index > 0){
updateDelta = -1;
}
if (updateDelta != 0) {
scaleDown(img);
changeIndex(_index + updateDelta);
return
}
}
var delta = Date.now() - _orgTime;
if (delta < 300) {
(delta <= 10)&&(delta = 10);
var deltaDis = Math.pow(180 / delta, 2);
_zoomXY[0] += (_zoomXY[0] - _orgZoomXY[0]) * deltaDis;
_zoomXY[1] += (_zoomXY[1] - _orgZoomXY[1]) * deltaDis;
$(img).css({"-webkit-transition": "400ms cubic-bezier(0.08,0.65,0.79,1)","transition": "400ms cubic-bezier(0.08,0.65,0.79,1)"})
} else{
$(img).css({"-webkit-transition": "200ms linear","transition": "200ms linear"});
}
if (borderX >= 0){
if (_zoomXY[0] < -borderX){
_zoomXY[0] = -borderX;
}else if (_zoomXY[0] > borderX){
_zoomXY[0] = borderX;
}
}
if (borderY > 0){
if (_zoomXY[1] < -borderY){
_zoomXY[1] = -borderY;
}else if (_zoomXY[1] >borderY){
_zoomXY[1] = borderY;
}
}
if (Math.abs(_zoomXY[0]) < 10) {
$(img).css({"-webkit-transform": "scale(" + _zoom + ") translate(0px," + _zoomXY[1] + "px)","transform": "scale(" + _zoom + ") translate(0px," + _zoomXY[1] + "px)"});
return
} else{
$(img).css({"-webkit-transform": "scale(" + _zoom + ") translate(" + _zoomXY[0] + "px," + _zoomXY[1] + "px)","transform": "scale(" + _zoom + ") translate(" + _zoomXY[0] + "px," + _zoomXY[1] + "px)"});
}
isDrag = false
}else{
if (!isSlide){ return;}
var deltaX = _transX - -_index * winW;
var updateDelta = 0;
if (deltaX > 50){
updateDelta = -1;
}else if(deltaX < -50){
updateDelta = 1;
}
_index=_index+updateDelta;
changeIndex(_index);
isSlide =false
}
},
click:function(e){
_zoom=1;
_zoomXY=[0,0];
_this.css("opacity","0");
timer=setTimeout(function(){
_this.css({"display":""}).html("");
unbind();
},150)
},
dobelTap:function(e){
clearTimeout(timer);
var now = new Date;
if (now - _lastTapDate < 500){
return;
}
_lastTapDate = now;
var img = getImg();
if (!img){
return;
}
if (_zoom != 1){
scaleDown(img);
}else{
scaleUp(img);
}
},
setView:function(e){
winW=window.innerWidth;
winH=window.innerHeight;
_this.width(window.innerWidth).height(window.innerHeight);
translate((-_index*window.innerWidth),0,0,$(".pv-inner")[0]);
scaleDown(getImg())
}
};
var handleEvent=function(e){
switch (e.type){
case "touchstart":
Event.touchstart(e);
break;
case "touchmove":
Event.touchmove(e);
break;
case "touchcancel":
case "touchend":
Event.touchend(e);
break;
case "orientationchange":
case "resize":
Event.setView(e);
break
}
};
/**
* 绑定事件
*/
var bind=function(){
_this.on("singleTap",function(e){
e.preventDefault();
var now = new Date;
if (now - _lastTapDate < 500){
return;
}
_lastTapDate = now;
Event.click(e);
return false;
}).on("doubleTap", function(e) {
e.preventDefault();
Event.dobelTap(e);
return false;
});
_this.on("touchstart touchmove touchend touchcancel", function(e) {
handleEvent(e);
});
Event.setView();
"onorientationchange" in window ? window.addEventListener("orientationchange",Event.setView,false) : window.addEventListener("resize",Event.setView,false);
};
/**
* 解除事件
*/
var unbind= function() {
_this.off();
"onorientationchange" in window ? window.removeEventListener("orientationchange",Event.setView, false) : window.removeEventListener("resize",Event.setView, false)
};
var getDist= function(x1, y1, x2, y2) {
return Math.sqrt(Math.pow(x2 - x1, 2) + Math.pow(y2 - y1, 2), 2)
}
/**
* 图片缩放
*/
var getScale=function(img) {
var h = img.naturalHeight, w = img.naturalWidth,
Scale=w*h/(img.clientHeight*img.clientWidth);
return Scale;
};
var scaleUp=function(img) {
var scale = getScale(img);
if (scale > 1)
$(img).css({"-webkit-transform": "scale(" + scale + ")","transform": "scale(" + scale + ")","-webkit-transition": "200ms","transition": "200ms"});
_zoom = scale;
};
var scaleDown=function(img) {
_zoom = 1;
_zoomXY = [0, 0];
_doubleDistOrg = 1;
_doubleZoomOrg = 1;
$(img).css({"-webkit-transform": "scale(1)","transform": "scale(1)","-webkit-transition": "200ms","transition": "200ms"});
};
/**
* 滑动效果
* dist
*/
var translate = function( distX,distY,speed,ele) {
if( !!ele ){ ele=ele.style; }else{ return; }
ele.webkitTransitionDuration = ele.MozTransitionDuration = ele.msTransitionDuration = ele.OTransitionDuration = ele.transitionDuration = speed + 'ms';
ele.webkitTransform = 'translate(' + distX + 'px,'+distY+'px)' + 'translateZ(0)';
ele.msTransform = ele.MozTransform = ele.OTransform = 'translateX(' + distX + 'px) translateY(' + distY + 'px)';
};
/**
* 更改索引值 _index
*/
var changeIndex=function(index,force){
if (index < 0){
index = 0;
}else if(index >= _length){
index =_length - 1;
}
_index = index;
translate((-_index*window.innerWidth),0,force? "0" : "200" ,$(".pv-inner")[0]);
$("#J_index").html(_index+1+"/"+_length);
imgLoad();
}
/**
* 图片获取
*/
var getImg=function(index) {
var img = _this.find("li").eq(index || _index).find("img");
if (img.size() == 1){
return img[0];
}else{
return null
}
}
/**
* 图片加载
*/
var imgLoad=function(){
if($(".pv-img").eq(_index).find("img")[0]){
$("#J_loading").css("display","");
return;
}else{
$("#J_loading").css("display","block");
var tempImg=new Image(),w,h,set;
tempImg.src=_ImgData[_index];
$(".pv-img").eq(_index)[0].appendChild(tempImg);
tempImg.onload=function(){
$("#J_loading").css("display","");
}
}
};
/**
* 创建大图查看Dome结构
*/
var Create=function(){
_this.append("<ul class='pv-inner'></ul>").append("<p class='counts'><span class='value' id='J_index'>"+(_index+1)+"/"+_length+"</span></p>").append("<span class='ui-loading' id='J_loading' ><i class='t1'></i><i class='t2'></i><i class='t3'></i></span>")
for(var i=0;i<_length;i++){
$(".pv-inner").append("<li class='pv-img'></li>")
}
imgLoad();
};
/**
* 大图查看初始化
*/
var init=function(){
!!_this[0]||$("body").append("<div class='slide-view' id='slideView'></div>");
_this=$("#slideView");
($.os.iphone || $.os.android && parseFloat($.os.version) >= 4)&&(_advancedSupport = true);
}();
/**
* 大图查看返回接口函数
* ImageView(index,data)
* index 初始索引值 nubmer
* data 图片数组 array
*/
var ImageView=function(index,data){
_ImgData=data;
_index=index;
_length=data.length;
//创建dom结构
Create();
//dom结构显示
_this.css("display","block");
//绑定事件
bind();
}
return ImageView;
})(window,Zepto);
ImageView.js用到的css代码如下：
代码如下:
/*大图查看*/
.slide-view {background: #000;position: fixed;width: 100%;height: 100%;overflow: hidden;top: 0;left: 0;z-index: 100;opacity:0;display: none;-webkit-animation:fadeIn .2s linear forwards;animation:fadeIn .2s linear forwards;-webkit-touch-callout: none;-webkit-transform-style: preserve-3d; }
.slide-view .counts {position: absolute;top: 5%;left: 0;right: 0;text-align: center;font-size: 0;-webkit-transform-style: preserve-3d; }
.slide-view .counts .value {border-radius: 9px;line-height: 18px;padding: 0 6px;font-size: 11px;display: inline-block;background-color: rgba(102,102,102,.6);color: #f1f1f1;}
.pv-inner {position: relative;z-index: -1;display: -webkit-box;display: box;width: 100%;height: 100%;-webkit-transition: all 350ms linear;-webkit-backface-visibility: hidden;transition: all 350ms linear;backface-visibility: hidden;-webkit-touch-callout: none;-webkit-transform-style: preserve-3d; }
.pv-inner li {text-align: center;display: -webkit-box;display: box;-webkit-box-align: center;overflow: hidden;width: 100%;height: 100%;-webkit-touch-callout: none;backface-visibility: hidden;-webkit-transform-style: preserve-3d; }
.pv-inner img {max-width: 97%;max-height: 100%;-webkit-transform: scale(1) translate(0px,0px);transform: scale(1) translate(0px,0px);visibility: visible;-webkit-transition: 200ms;transition: 200ms;-webkit-user-select: none;user-select: none;display: block;margin: 0 auto;backface-visibility: hidden;-webkit-transform-style: preserve-3d; }
@-webkit-keyframes fadeIn{
0%{opacity:0;}
100%{opacity:1;}
}
@keyframes fadeIn{
0%{opacity:0;}
100%{opacity:100%;}
}
/*--------------------loading-----------------------*/
.ui-loading {position: absolute;left: 50%;top: 50%;display: none;vertical-align: middle;font: 0/0 arial;margin: -5px 0 0 -10px;}
.ui-loading i {display: inline-block;width: 5px;height: 12px;background: #fff;vertical-align: top;-webkit-animation: loading-spin 1s infinite linear;animation: loading-spin 1s infinite linear;}
.ui-loading i {-webkit-animation: loading-spin 1s infinite linear;animation: loading-spin 1s infinite linear}
.ui-loading i.t2 {margin: 0 3px;-webkit-animation-name: loading-spin-one;animation-name: loading-spin-one}
.ui-loading i.t3 {-webkit-animation-name: loading-spin-two;animation-name: loading-spin-two}
@-webkit-keyframes loading-spin {
0% {opacity: 0}
30% {opacity: 1;-webkit-transform: scale(1,1.2)}
60% {opacity: 0;-webkit-transform: scale(1)}
100% {opacity: 0}
}
@-webkit-keyframes loading-spin-one {
0% {opacity: 0}
20% {opacity: 0}
50% {opacity: 1;-webkit-transform: scale(1,1.2)}
80% {opacity: 0;-webkit-transform: scale(1)}
100% {opacity: 0}
}
@-webkit-keyframes loading-spin-two {
0% {opacity: 0}
40% {opacity: 0}
70% {opacity: 1;-webkit-transform: scale(1,1.2)}
100% {opacity: 0;-webkit-transform: scale(1)}
}
@keyframes loading-spin {
0% {opacity: 0}
30% {opacity: 1;transform: scale(1,1.2)}
60% {opacity: 0;transform: scale(1)}
100% {opacity: 0}
}
@keyframes loading-spin-one {
0% {opacity: 0}
20% {opacity: 0}
50% {opacity: 1;transform: scale(1,1.2)}
80% {opacity: 0;transform: scale(1)}
100% {opacity: 0}
}
@keyframes loading-spin-two {
0% {opacity: 0}
40% {opacity: 0}
70% {opacity: 1;transform: scale(1,1.2)}
100% {opacity: 0;transform: scale(1)}
}
/*--------------------loading-end----------------------*/
ps:代码功能比较简单，可能会存在诸多问题。但也能勉强使用了
下用是使用ImageView.js的一个例子：
代码如下:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1.0,minimum-scale=1.0,maximum-scale=1.0,user-scalable=no">
<title>移动端大图查看</title>
<script type="text/javascript" src="test_files/zepto.min.js" ></script>
<script type="text/javascript" src="test_files/ImageView.js" ></script>
</head>
<body>
<!--以上为HTML页面结构 -->
<!--以下为ImageView使用例子 -->
<script>
;(function(){
//获取 html 中的图片元素
var aImg=document.querySelectorAll("img"),
aImgSrc=[];
//为图片绑定单击事件
for(var i=0,l=aImg.length;i<l;i++){
aImg[i].index=i;
aImg[i].className+=" conPic";
aImgSrc.push(aImg[i].src);
}
for(var i=0;i<$(".conPic").length;i++){
if($(".conPic")[i].complete){
addTap($(".conPic")[i])
}else{
$(".conPic")[i].onload=function(){
addTap(this);
}
}
}
function addTap(obj){
$(obj).on("tap",function(){
//调用ImageView
ImageView($(obj)[0].index,aImgSrc);
})
}
})();
</script>
</body>
