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preview.js
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(function(){
var util = {
css: function(elem,obj){
for(var i in obj){
elem.style[i] = obj[i];
}
},
addEvent: (function(window, undefined) {
var _eventCompat = function(event) {
var type = event.type;
if (type == 'DOMMouseScroll' || type == 'mousewheel') {
event.delta = (event.wheelDelta) ? event.wheelDelta / 120 : -(event.detail || 0) / 3;
}
//alert(event.delta);
if (event.srcElement && !event.target) {
event.target = event.srcElement;
}
if (!event.preventDefault && event.returnValue !== undefined) {
event.preventDefault = function() {
event.returnValue = false;
};
}
return event;
};
if (window.addEventListener) {
return function(el, type, fn, capture) {
if (type === "mousewheel" && document.mozFullScreen !== undefined) {
type = "DOMMouseScroll";
}
el.addEventListener(type, function(event) {
fn.call(this, _eventCompat(event));
}, capture || false);
};
} else if (window.attachEvent) {
return function(el, type, fn, capture) {
el.attachEvent("on" + type, function(event) {
event = event || window.event;
fn.call(el, _eventCompat(event));
});
};
}
return function() {};
})(window)
};
function Preview(opt){
var _this = this;
if(!opt.imgWrap || opt.imgWrap==""){
alert("请填写图片容器id");
return;
}
this.Opt = {
imgWrap: '',
beforeCreat: function(){},
afterCreat: function(){}
};
// 同步参数
for(var i in this.Opt){
if(opt[i]) this.Opt[i] = opt[i];
}
this.elemPreviewContain = document.getElementsByTagName("body")[0]; // 预览容器 预览默认展示在body内一层
this.elemContain = document.getElementById(this.Opt.imgWrap); // 被预览图片外面的容器
this.elemPreviewImg = null; // 预览的图片的载体
this.elemPreviewClose = null; // 关闭预览按钮
this.imgBg = null; // 预览最后面的黑色背景
this.moveObj = null // 实际被拖动的元素
this.init();
// 预览图片
this.LEFT = this.elemPreviewContain.offsetWidth/2; // 记录刚开始网页显示距离左边的位置
this.TOP = this.elemPreviewContain.offsetHeight/2; // 记录刚开始网页显示距离上边的位置
this.onOff = true; // 是否是点击事件的开关
this.startX = 0; // 存储按下鼠标时相对浏览器的位置X
this.startY = 0; // 存储按下鼠标时相对浏览器的位置Y
this.moveX = 0; // 移动的时候元素的left值
this.moveY = 0; // 移动的时候元素的top值
this._WIDTH = 0; // 预览图片原始载体宽度
this._HEIGHT = 0; // 预览图片原始载体高度
this.WIDTH = 0; // 预览图片载体宽度
this.HEIGHT = 0; // 预览图片载体高度
}
Preview.VERSION = '1.0.0';
var randomNum = new Date().getTime();
Preview.initParams = {
bgClass: "img_bgmask"
};
Preview.prototype = {
constructor: Preview,
init: function(){
var _this = this;
this.imgBg = document.createElement("div");
this.imgBg.className = 'img_bgmask';
util.css(this.imgBg,{position:"fixed",left:0,top:0,width:'100%',height:"100%",fontSize:0,background:'rgba(0,0,0,.6)',display:"none"});
this.imgBg.innerHTML = '<span style="position: absolute;top: 50px;right:50px;z-index: 10;height: 48px;width: 48px;background:red;cursor:pointer;border-radius:50%;" class="close_bgmask"></span><div style="position:absolute;left:50%;top:50%;" class="view_img_wrap"><img style="width:100%;height:100%;position: relative;z-index: -1;" src="" alt=""></div>';
this.elemPreviewContain.appendChild(this.imgBg);
this.elemPreviewImg = this.imgBg.getElementsByTagName("img")[0];
this.moveObj = this.elemPreviewImg.parentNode; // 被移动的元素，这里是图片载体的容器div
this.elemPreviewClose = this.imgBg.getElementsByTagName("span")[0];
this.elemContain.addEventListener("click",preview,false);
function preview(e){
e = e || window.event;
e.stopPropagation();
var target = e.target;
var tag = target.tagName.toLowerCase();
if(tag!=='img') return;
_this.elemPreviewImg.src = target.src;
util.css(_this.imgBg,{display:"block"});
_this._WIDTH = _this.WIDTH = _this.elemPreviewImg.offsetWidth;
_this._HEIGHT = _this.HEIGHT = _this.elemPreviewImg.offsetHeight;
util.css(_this.moveObj,{
width:_this.WIDTH+"px",
marginLeft:-_this.WIDTH/2+"px",
marginTop:-_this.HEIGHT/2+"px",
left:'50%',
top:'50%'
})
}
this.moveObj.addEventListener("mousedown",mousedown,false);
function mousedown(e){
e = e || window.event;
e.stopPropagation();
_this.onOff = true;
_this.startX = e.pageX;
_this.startY = e.pageY;
document.addEventListener("mousemove",mousemove,false);
function mousemove(ev){
_this.onOff=false;
_this.moveX = ev.pageX-_this.startX+_this.LEFT;
_this.moveY = ev.pageY-_this.startY+_this.TOP;
util.css(_this.moveObj,{
"left":_this.moveX+"px",
"top":_this.moveY+"px"
});
ev.preventDefault();
}
document.addEventListener("mouseup",mouseup,false);
function mouseup(ev){
document.removeEventListener("mousemove",mousemove,false);
document.removeEventListener("mouseup",mouseup,false);
if(_this.onOff) return false;
_this.LEFT = _this.moveX;
_this.TOP = _this.moveY;
}
e.preventDefault();
}
this.elemPreviewClose.onclick = function(){
_this.previewClose();
};
util.addEvent(this.imgBg, "mousewheel", function(event) {
this.WIDTH = _this.elemPreviewImg.offsetWidth;
if (event.delta > 0) {
util.css(_this.moveObj,{width:(this.WIDTH+20)+"px"});
}else {
util.css(_this.moveObj,{width:(this.WIDTH-20)+"px"});
}
this.HEIGHT = _this.elemPreviewImg.offsetHeight;
util.css(_this.moveObj,{
marginLeft:-this.WIDTH/2+"px",
marginTop:-this.HEIGHT/2+"px"
});
});
},
previewClose: function(){
this.LEFT = this.elemPreviewContain.offsetWidth/2; // 记录刚开始网页显示距离左边的位置
this.TOP = this.elemPreviewContain.offsetHeight/2; // 记录刚开始网页显示距离上边的位置
util.css(this.moveObj,{width:this._WIDTH+"px"});
util.css(this.imgBg,{display:"none"});
}
};
window.Preview = Preview;
})();