创建遮罩层

复制代码 代码如下:

_createCover: function() {

var newMask = document.createElement("div");

newMask.id = this._mark;

newMask.style.position = "absolute";

newMask.style.zIndex = "100";

_scrollWidth = Math.max(document.body.scrollWidth,document.documentElement.scrollWidth);

_scrollHeight = Math.max(document.body.scrollHeight,document.documentElement.scrollHeight);

newMask.style.width = _scrollWidth + "px";

newMask.style.height = _scrollHeight + "px";

newMask.style.top = "0px";

newMask.style.left = "0px";

newMask.style.background = "#000";

newMask.style.filter = "alpha(opacity=50)";

newMask.style.opacity = "0.50";

newMask.style.display = 'none';

document.body.appendChild(newMask);

this._cover = newMask;

}

新建弹出层

复制代码 代码如下:

_createFloater: function(html) {

var newDiv = document.createElement("div");

newDiv.id = this._id;

newDiv.style.position = "absolute";

newDiv.style.zIndex = "9999";

newDivWidth = 400;

newDivHeight = 200;

newDiv.style.width = newDivWidth + "px";

newDiv.style.height = newDivHeight + "px";

newDiv.style.top = (document.body.scrollTop + document.body.clientHeight/2 - newDivHeight/2) + "px";

newDiv.style.left = (document.body.scrollLeft + document.body.clientWidth/2 - newDivWidth/2) + "px";

newDiv.style.padding = "5px";

newDiv.style.display = 'none';

newDiv.innerHTML = html;

document.body.appendChild(newDiv);

this._floater = newDiv;

}

调节弹层位置

复制代码 代码如下:

addjustPosition: function() {

this._floater.style.top = (document.body.scrollTop + document.body.clientHeight/2 - newDivHeight/2) + "px";

this._floater.style.left = (document.body.scrollLeft + document.body.clientWidth/2 - newDivWidth/2) + "px";

}

屏幕滚动事件时调整位置

复制代码 代码如下:

this._fS = BindAsEventListener(this, this.addjustPosition);

addEventHandler(window, "scroll", this._fS);

// 隐藏后需

removeEventHandler(window, "scroll", this._fS);

完整代码

复制代码 代码如下:

var Floater = (function(){

var me = Class.create();

me.prototype = {

initialize: function(options) {

this._fS = BindAsEventListener(this, this.addjustPosition);

this.setOptions(options);

},

setOptions: function(options) {

this.options = options || {};

this._id = options.id;

this._mark = 'mark';

},

show: function(html,options) {

options = options || {};

if(!this._cover){

this._createCover();

}

if(!this._floater){

this._createFloater(html);

}

if(options.saveOpt){

this._saveOption = options.saveOpt;

this.bindSaveEvent();

}

this._bindScrollEvent();

this.addjustPosition();

this._floater.style.display = '';

this._cover.style.display = '';

this.isShow = true;

},

insert: function(html,opts,att){

var _e = document.createElement("div"), _t;

_e.innerHTML = html;

for(var k in opts){

_e[k] = opts[k];

}

_t = this._floater.querySelector('['+att+']');

if(_t){

_t.appendChild(_e);

}

},

getFloater: function(){

if(this._floater){

return this._floater;

}

},

//遮罩层

_createCover: function() {

var newMask = document.createElement("div");

newMask.id = this._mark;

newMask.style.position = "absolute";

newMask.style.zIndex = "100";

_scrollWidth = Math.max(document.body.scrollWidth,document.documentElement.scrollWidth);

_scrollHeight = Math.max(document.body.scrollHeight,document.documentElement.scrollHeight);

newMask.style.width = _scrollWidth + "px";

newMask.style.height = _scrollHeight + "px";

newMask.style.top = "0px";

newMask.style.left = "0px";

newMask.style.background = "#000";

newMask.style.filter = "alpha(opacity=50)";

newMask.style.opacity = "0.50";

newMask.style.display = 'none';

document.body.appendChild(newMask);

this._cover = newMask;

},

//新弹出层

_createFloater: function(html) {

var newDiv = document.createElement("div");

newDiv.id = this._id;

newDiv.style.position = "absolute";

newDiv.style.zIndex = "9999";

newDivWidth = 400;

newDivHeight = 200;

newDiv.style.width = newDivWidth + "px";

newDiv.style.height = newDivHeight + "px";

newDiv.style.top = (document.body.scrollTop + document.body.clientHeight/2 - newDivHeight/2) + "px";

newDiv.style.left = (document.body.scrollLeft + document.body.clientWidth/2 - newDivWidth/2) + "px";

newDiv.style.padding = "5px";

newDiv.style.display = 'none';

newDiv.innerHTML = html;

document.body.appendChild(newDiv);

this._floater = newDiv;

},

//弹出层滚动居中

addjustPosition: function() {

this._floater.style.top = (document.body.scrollTop + document.body.clientHeight/2 - newDivHeight/2) + "px";

this._floater.style.left = (document.body.scrollLeft + document.body.clientWidth/2 - newDivWidth/2) + "px";

},

bindSaveEvent: function() {

this._saveElem = this._floater.querySelector('['+this._saveOption.elem+']');

if(this._saveElem){

addEventHandler(this._saveElem, "click", this._saveOption.handler);

}

},

_bindScrollEvent: function() {

addEventHandler(window, "scroll", this._fS);

},

hide: function() {

this.isShow = false;

this.destory();

},

destory: function() {

removeEventHandler(window, "scroll", this._fS);

if(this._saveElem){

removeEventHandler(this._saveElem, "click", this._saveOption.handler);

}

if (this._cover){

document.body.removeChild(this._cover);

}

if (this._floater){

document.body.removeChild(this._floater);

}

this._cover = null;

this._floater = null;

}

};

return me;

})();