javascript 在线文本编辑器实现代码

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function createtab(tri,tdi,arisetab,arisetr,arisetd,p){ 
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tbody.appendChild(tr); 
} 
table.appendChild(tbody); 
return table; 
}; 
var Extend = function(destination, source) { 
for (var property in source) { 
destination[property] = source[property]; 
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}; 
function addListener(element,e,fn){ 
element.addEventListener?element.addEventListener(e,fn,false):element.attachEvent("on" + e,fn); 
}; 
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element.removeEventListener?element.removeEventListener(e,fn,false):element.detachEvent("on" + e,fn); 
}; 
var Class = function(properties){ 
var _class = function(){return (arguments[0] !== null && this.initialize && typeof(this.initialize) == 'function') ? this.initialize.apply(this, arguments) : this;}; 
_class.prototype = properties; 
return _class; 
}; 
var Editer = new Class({ 
options:{ 
width :890, 
height :700, 
facebg : [ 
{bgimg:"-4px -4px",title:"微笑",wl:22,src:"http://album.hi.csdn.net/app_uploads/wtcsy/20090719/220846596.p.gif"},{bgimg:"-31px -4px",title:"大笑",wl:22,src:"http://album.hi.csdn.net/app_uploads/wtcsy/20090719/220859814.p.gif"},{bgimg:"-58px -4px",title:"窃笑",wl:22,src:"http://album.hi.csdn.net/app_uploads/wtcsy/20090719/220911971.p.gif"},{bgimg:"-85px -4px",title:"眨眼",wl:22,src:"http://album.hi.csdn.net/app_uploads/wtcsy/20090719/220928549.p.gif"},{bgimg:"-112px -4px",title:"鬼脸",wl:22,src:"http://album.hi.csdn.net/app_uploads/wtcsy/20090719/220928549.p.gif"},{bgimg:"-139px -4px",title:"色色",wl:22,src:"http://album.hi.csdn.net/app_uploads/wtcsy/20090719/220951955.p.gif"},{bgimg:"-167px -4px",title:"暴牙",wl:22,src:"http://album.hi.csdn.net/app_uploads/wtcsy/20090719/220958111.p.gif"},{bgimg:"-194px -4px",title:"讨厌",wl:22,src:"http://album.hi.csdn.net/app_uploads/wtcsy/20090719/221004564.p.gif"} 
], 
fontsizedata : { fontSize:["字号1","字号2","字号3","字号4","字号5","字号6","字号7"], 
fontname:["宋体","黑体","楷体","隶书","幼圆","Arial","Georgia","Verdana","Helvetica"] 
}, 
oninit:function(){} 
}, 
initialize:function(container,data,b,options){ 
this.container = container; 
this._body = create("div",container); 
this.toolbar = create("div",this._body); //工具栏 
this.iframe = create("iframe",this._body); //编辑区 
this.textarea = create("textarea",this._body); //显示源代码的框框 
this.bottom = create("div",this._body); //底部 
this.lightbox = b; //lightbox 
this.original = create("input"); //显示源代码的按纽 
this.ed = null; 
this.isfocus = false; 
this.option = {}; 
Extend(this.option,this.options); 
Extend(this.option,options); 
this.rang = null; //选中区 
this.Fpop = null; 
this.option.oninit(); 
this.toolbar.className = "ebar"; 
this._body.className = "ebody"; 
this.textarea.className = "textarea"; 
Css(this._body,{width:this.option.width+"px",height:this.option.height+"px"}); 
Css(this.textarea,{width:Sys.IE?this.option.width-2+"px":this.option.width+"px",height:Sys.IE?this.option.height-66+"px":this.option.height-70+"px"}); 
Attr(this.iframe,{src:"about:blank",width:Sys.IE?this.option.width:this.option.width-4,height:Sys.IE?this.option.height-66:this.option.height-70}); 
Attr(this.original,{type:"checkbox",className:"checkbox",align:"top"}); 
this.bottom.className = "bottom"; 
this.bottom.innerHTML = "<span>显示源代码</span>"; 
this.bottom.insertBefore(this.original,this.bottom.childNodes[0]); 
this.ed=Sys.IE?this.iframe.contentWindow.document:this.iframe.contentDocument; 
this.ed.open(); 
var div = Sys.IE?"<div></div>":""; 
this.ed.write("<html><head><style>body{margin:5px;font-size:16px;word-wrap:break-word}</style></head><body id='my_body'>"+div+"</body></html>"); 
this.ed.close(); 
this.ed.contentEditable = true; 
this.ed.designMode = "on";//设置编辑区为可编辑 
for(var i = 0,l = data.length;i<l;i++) 
{ 
var o = create("span",this.toolbar); 
Attr(o,{title:data[i].title,active:false,unselectable:"on"}); 
o.className ="tag "+data[i].Class; 
addListener(o,"mouseover",Bind(this,this.Changebgcolor,o,data[i].hover)); 
addListener(o,"mouseout",Bind(this,this.Changebgcolor,o,data[i].Class)); 
addListener(o,"click",Bind(this,this[data[i].action],o,data[i].args)); 
} 
//////////////////////////生成工具栏 
addListener(this.iframe.contentWindow,"focus",Bind(this,function(){this.isfocus = true;})); 
addListener(this.iframe.contentWindow,"blur",Bind(this,function(){this.isfocus = false;})); 
addListener(this.ed,'mousedown',Bind(this,this.Show)); 
addListener(this.ed,'mouseup',Bind(this,this.Show)); 
//////////////////////////这2个事件是来判断光标所在位置是否别编辑 
addListener(this.original,'click',Bind(this,this.Showoriginal,this.original)); //显示源代码 
}, 
Changebgcolor:function(o,name,p){ 
if(o.active)return; 
o.className = "tag "+name; 
}, 
Show:function(){ 
var spans = $$(this.toolbar,"span"),Is; 
var elm = [[spans[0],"Bold","tag span0_active","tag span0"], 
[spans[1],"Italic","tag span1_active","tag span1"], 
[spans[2],"Underline","tag span2_active","tag span2"], 
[spans[12],"InsertUnorderedList","tag span3_active","tag span12"], 
[spans[13],"InsertOrderedList","tag span4_active","tag span13"]]; 
for(var i=0,l=elm.length;i<l;i++) 
{ 
Is = this.ed.queryCommandState(elm[i][1]); 
elm[i][0].className = Is?elm[i][2]:elm[i][3]; 
elm[i][0].active = Is; 
} 
}, 
Showoriginal:function(o){ 
if(!this.toolbarlayer){ 
this.toolbarlayer= create("div",document.body); 
this.toolbarlayer.className = "toolbarlayer"; 
var pos = Getpos(this.toolbar); 
Css(this.toolbarlayer,{width:this.option.width+"px",left:pos.x+"px",top:pos.y+"px"}); 
} 
if(o.checked) 
{ 
this.iframe.style.display = "none"; 
this.textarea.style.display = "block"; 
this.toolbarlayer.style.display = "block"; 
this.textarea.value = this.ed.body.innerHTML; 
} 
else 
{ 
this.iframe.style.display = "block"; 
this.textarea.style.display = "none"; 
this.toolbarlayer.style.display = "none"; 
this.ed.body.innerHTML = this.textarea.value; 
} 
}, 
Exec:function(o,cmd,para){ 
try{ 
this.ed.execCommand(cmd,false, para); 
this.Show(); 
} 
catch(err) 
{ 
return; 
} 
}, 
InsertImage:function(o){ 
if(Sys.IE) 
{ 
!this.isfocus&&this.iframe.contentWindow.focus(); 
this.rang = this.ed.selection.createRange(); 
} 
this.lightbox.Show(); 
this.makebody(this.Imagepopoup,"350px","插入图片","InsertImage","Imagepopoup"); 
}, 
CreateLink:function(o){ 
if(Sys.IE)this.rang = this.ed.selection.createRange(); 
this.lightbox.Show(); 
this.makebody(this.Linkpopoup,"350px","插入连接","CreateLink","Linkpopoup"); 
}, 
Fontcolor:function(o){ 
var self = this; 
if(!this.fontcolorpopup) 
{ 
var color = new popoup({width:"210px",title:"颜色选择"}); 
this.fontcolorpopup = color.container; 
var pos = Getpos(o); 
Css(color.container,{left : pos.x + "px",top : pos.y + o.offsetHeight + "px"}); 
var bgcolor = ["00","33","66","99","CC","FF","00","33","66","99","CC","FF"]; 
$$(color.container,"div")[1].appendChild(createtab(12,18,function(tab){ 
Attr(tab,{cellPadding:0,cellSpacing:1,border:0,bgColor:"#333333"}); 
},null,function(i,j,td){ 
var color =i<6?"#"+bgcolor[Math.floor(j/6)]+bgcolor[Math.floor(j%6)]+bgcolor[i]:"#"+bgcolor[Math.floor(j/6)+3]+bgcolor[Math.floor(j%6)]+bgcolor[i-6]; 
Attr(td,{width:10,height:10,unselectable:"on"}); 
td.style.backgroundColor = color; 
addListener(td,'click',Bind(self,self.Execa,color,"fontColor")); 
addListener(td,'mousedown',BindAsEventListener(self,self.Bubble)); 
})) 
} 
else 
this.fontcolorpopup.style.display = "block"; 
this.Fpop = Bind(this,this.Hide); 
addListener(this.ed,'click',this.Fpop); 
addListener(document,'mousedown',this.Fpop); 
}, 
Expression:function(o){ 
var self = this; 
if(!this.facebgpopup) 
{ 
var expr = new popoup({width:"190px",title:"插入表情"}); 
this.facebgpopup = expr.container; 
var pos = Getpos(o); 
Css(expr.container,{left : pos.x +"px",top : pos.y + o.offsetHeight +"px"}); 
$$(expr.container,"div")[1].appendChild(createtab(1,this.option.facebg.length,function(tab){ 
Attr(tab,{cellPadding : 0,cellSpacing : 1,border : 0,bgColor:"#FFFFFF"}); 
},null,function(i,j,td){ 
Css(td,{backgroundImage:"url(http://album.hi.csdn.net/app_uploads/wtcsy/20090719/220510752.p.gif)",backgroundPosition : self.option.facebg[j].bgimg}); 
Attr(td,{width:self.option.facebg[i].wl,height:self.option.facebg[i].wl,unselectable:"on"}); 
addListener(td,'click',Bind(self,self.Execa,self.option.facebg[j].src,"Expression")); 
addListener(td,'mousedown',BindAsEventListener(self,self.Bubble)) 
})); 
} 
else 
this.facebgpopup.style.display = "block"; 
this.Fpop = Bind(this,this.Hide); 
addListener(this.ed,'click',this.Fpop); 
addListener(document,'mousedown',this.Fpop); 
}, 
Layout:function(){ 
var child = this.ed.body.childNodes; 
for(var i=0,l=child.length;i<l;i++) 
{ 
if(child[i].nodeName == "DIV"||child[i].nodeName == "P") 
child[i].style.textIndent= child[i].style.textIndent== "2em"?"":"2em"; 
} 
}, 
Fontsize:function(o){ 
if(!this.fontsizepopup) 
{ 
var size = new popoup({width:"210px",title:"字号"}),a; 
this.fontsizepopup = size.container; 
var pos = Getpos(o); 
Css(size.container,{left:pos.x +"px",top : pos.y + o.offsetHeight +"px"}); 
for(var i = 0,l=this.option.fontsizedata .fontSize.length;i<l;i++) 
{ 
a = create("a",$$(size.container,"div")[1]); 
a.className = "c"+(i+1); 
a.setAttribute("href","javascript:void(0);") 
a.innerHTML=this.option.fontsizedata.fontSize[i]; 
addListener(a,"click",Bind(this,this.Execa,i,"fontSize")); 
addListener(a,'mousedown',BindAsEventListener(this,this.Bubble)); 
} 
}else 
this.fontsizepopup.style.display = "block"; 
this.Fpop = Bind(this,this.Hide); 
addListener(this.ed,'click',this.Fpop); 
addListener(document,'mousedown',this.Fpop); 
}, 
FontName:function(o){ 
if(!this.fontnamepopup) 
{ 
var name = new popoup({width:"200px",title:"字体"}),a; 
this.fontnamepopup = name.container; 
var pos = Getpos(o); 
Css(name.container,{left:pos.x +"px",top:pos.y + o.offsetHeight +"px"}); 
for(var i = 0,l=this.option.fontsizedata .fontname.length;i<l;i++) 
{ 
a = create("a",$$(name.container,"div")[1]); 
a.className = "n"; 
a.setAttribute("href","javascript:void(0);"); 
a.innerHTML=this.option.fontsizedata.fontname[i]; 
addListener(a,"click",Bind(this,this.Execa,this.option.fontsizedata.fontname[i],"fontname")); 
addListener(a,'mousedown',BindAsEventListener(this,this.Bubble)); 
} 
}else 
this.fontnamepopup.style.display = "block"; 
this.Fpop = Bind(this,this.Hide); 
addListener(this.ed,'click',this.Fpop); 
addListener(document,'mousedown',this.Fpop); 
}, 
makebody :function(o,w,t,f,n){ 
if(!o) 
{ 
var self = this; 
this[n]= new popoup({width:w,title:t}); 
this[n].pos(); 
$$(this[n].container,"div")[1].innerHTML = "<div style=' margin-top:6px; margin-left:10px'><span >连接地址</span>　<input style='width:200px;' type='text' /></div><div style='text-align:center; padding-top:15px;'><img src='http://album.hi.csdn.net/app_uploads/wtcsy/20090719/220836549.p.gif'>　<img src='http://album.hi.csdn.net/app_uploads/wtcsy/20090719/220726721.p.gif'></div>" 
this[n].elm = [$$(this[n].container,"input")[0],$$(this[n].container,"img")[0],$$(this[n].container,"img")[1]]; 
this[n].elm[0].focus() 
addListener(this[n].elm[1],'click',Bind(this,this.Execa,null,f)); 
addListener(this[n].elm[2],'click',function(){self.lightbox.Close();self[n].Close();}); 
} 
else 
with(this[n]){pos();Show();elm[0].value="";elm[0].focus();} 
}, 
Addtable:function(){ 
if(Sys.IE) 
{ 
!this.isfocus&&this.iframe.contentWindow.focus(); 
this.rang = this.ed.selection.createRange(); 
} 
this.lightbox.Show(); 
if(Sys.IE)this.rang = this.ed.selection.createRange(); 
if(!this.tablepopup) 
{ 
var self = this; 
this.tablepopup = new popoup({width:"300px",title:"插入表格"}); 
this.tablepopup.pos(); 
$$(this.tablepopup.container,"div")[1].innerHTML = "<div style='margin-left:30px; margin-top:7px;'>行数：<input style='width:50px; height:13px' type='text' />　列数：<input style='width:50px;height:13px' type='text' /></div><div style=' margin-left:30px; margin-top:7px;'>表格的宽度：<input style='width:50px; height:13px' type='text' /> px</div><div style=' margin-left:30px; margin-top:7px;'>表行的高度：<input style='width:50px; height:13px' type='text' /> px<div style='text-align:center; margin-left:30px; margin-top:7px;'><img src='http://album.hi.csdn.net/app_uploads/wtcsy/20090719/220836549.p.gif'>　<img src='http://album.hi.csdn.net/app_uploads/wtcsy/20090719/220726721.p.gif'></div>" 
var o = $$(this.tablepopup.container,"input"); 
this.tablepopup.elm = [o[0],o[1],o[2],o[3],$$(this.tablepopup.container,"img")[0],$$(this.tablepopup.container,"img")[1]]; 
addListener(this.tablepopup.elm[4],'click',Bind(this,this.Execa,null,"CreateTable")); 
addListener(this.tablepopup.elm[5],'click',function(){self.lightbox.Close();self.tablepopup.Close();}); 
} 
else 
with(this.tablepopup){pos();Show();elm[0].focus();} 
this.Fpop = Bind(this,this.Hide); 
addListener(this.ed,'click',this.Fpop); 
addListener(document,'mousedown',this.Fpop); 
}, 
Hide:function(o){ 
this.facebgpopup&&(this.facebgpopup.style.display = "none"); 
this.fontsizepopup&&(this.fontsizepopup.style.display = "none"); 
this.fontnamepopup&&(this.fontnamepopup.style.display = "none"); 
this.fontcolorpopup&&(this.fontcolorpopup.style.display = "none"); 
removeListener(this.ed,'click',this.Fpop); 
removeListener(document,'mousedown',this.Fpop); 
}, 
Bubble:function(e){ 
if(Sys.IE){e.cancelBubble=true}else{e.stopPropagation()} 
}, 
Execa:function(num,stamp){ 
var exec = { 
fontname : function(){ 
this.fontnamepopup.style.display = "none"; 
this.ed.execCommand('FontName',false,num); 
}, 
fontSize : function(){ 
this.fontsizepopup.style.display = "none"; 
this.ed.execCommand("FontSize",false,num+1) 
}, 
fontColor : function(){ 
this.fontcolorpopup.style.display = "none"; 
this.ed.execCommand("ForeColor",false,num); 
}, 
CreateLink : function(){ 
this.lightbox.Close();this.Linkpopoup.Close(); 
if(this.Linkpopoup.elm[0].value=="")return; 
if(Sys.IE) 
{ 
this.rang.execCommand("CreateLink",false,this.Linkpopoup.elm[0].value); 
this.rang.parentElement().target="_blank "; 
} 
else 
{ 
this.ed.execCommand("CreateLink",false,this.Linkpopoup.elm[0].value); 
this.rang = this.iframe.contentWindow.getSelection().getRangeAt(0); 
this.rang.commonAncestorContainer.parentNode.target="_blank "; 
} 
}, 
InsertImage : function(){ 
this.lightbox.Close();this.Imagepopoup.Close(); 
if(this.Imagepopoup.elm[0].value=="")return; 
Sys.IE?this.rang.execCommand("InsertImage",false,this.Imagepopoup.elm[0].value):this.ed.execCommand("InsertImage",false,this.Imagepopoup.elm[0].value); 
}, 
Expression : function(){ 
this.facebgpopup.style.display = "none"; 
Sys.IE&&(this.iframe.contentWindow.focus()); 
this.ed.execCommand("InsertImage",false,num); 
}, 
CreateTable : function(){ 
this.lightbox.Close();this.tablepopup.Close(); 
var o = this.tablepopup.elm,p = null; 
if(Sys.IE) 
{ 
this.rang.execCommand("InsertImage",false,"http://xxx.com/xxxxx.gif"); 
p = this.rang.parentElement(); 
} 
else 
{ 
this.ed.execCommand("InsertImage",false,"http://xxx.com/xxxxx.gif"); 
p = this.iframe.contentWindow.getSelection().getRangeAt(0).commonAncestorContainer; 
} 
var tab = createtab(o[0].value,o[1].value,function(tab){ 
Attr(tab,{cellPadding:0,cellSpacing:1,border:0,bgColor:"#CCCCCC",width:o[2].value}); 
},null,function(i,j,td){td.height=o[3].value;td.width=o[2].value/o[1].value; td.style.backgroundColor="#FFFFFF"},this.ed); 
var imgs = p.getElementsByTagName("img"); 
for(var i = 0,l=p.childNodes.length;i<l;i++) 
{ 
if(imgs[i].src=="http://xxx.com/xxxxx.gif") 
{p.replaceChild(tab,imgs[i])} 
} 
p.insertBefore(this.ed.createElement("br"),tab.nextSibling); 
} 
}; 
Bind(this,exec[stamp])(); 
} 
}); 
var popoup = new Class({ 
options:{ 
width:"200px", 
title:"标题" 
}, 
initialize:function(options){ 
this.container = create("div",document.body); 
Extend(this.options,options); 
this.title = this.options.title; 
this.container.className = "pp"; 
this.container.style.width = this.options.width; 
this.container.innerHTML = "<div class='ppt'><span style='margin-left:8px;'></span></div><div style='height:auto; width:auto; padding:7px; background-color:#FFFFFF'></div>"; 
this.w = this.container.offsetWidth; 
this.h = this.container.offsetHeight; 
$$(this.container,"span")[0].innerHTML = this.title; 
}, 
pos:function(){ 
var str ="left:"+(Math.max(document.documentElement.scrollWidth,document.documentElement.clientWidth) - this.w)/2+"px;top:"+((Math.min(document.documentElement.scrollHeight, document.documentElement.clientHeight)- this.h)/2+document.documentElement.scrollTop)+"px" 
Css(this.container,str); 
}, 
Show:function(){ 
this.container.style.display =""; 
}, 
Close:function(){ 
this.container.style.display ="none"; 
} 
}) 
var LightBox ={ 
obj : null, 
config :{ 
Color : "#fff", 
Opacity : 80, 
zIndex : 5 
}, 
init : function(options){ 
Extend(this.config,options||{}); 
Extend(this,this.config); 
delete this.config; 
this.obj = document.body.insertBefore(document.createElement("div"), document.body.childNodes[0]); 
var str = "display:none; z-index:"+this.zIndex+";left:0px;top:0px;position:fixed;width:100%;height:100%;background-color:"+this.Color+(Sys.IE ? ";filter : alpha(opacity:" + this.Opacity + ")" : ";opacity :"+ this.Opacity / 100); 
Css(this.obj,str); 
if(Sys.IE6){ 
this.obj.style.position = "absolute"; 
var _self = this; 
this._resize = function(){ 
_self.obj.style.width = Math.max(document.documentElement.scrollWidth, document.documentElement.clientWidth) + "px"; 
_self.obj.style.height = Math.max(document.documentElement.scrollHeight, document.documentElement.clientHeight)+"px"; 
}; 
this.obj.innerHTML = '<iframe style="position:absolute;top:0;left:0;width:100%;height:100%;filter:alpha(opacity=0);"></iframe>'; 
} 
return this; 
}, 
Show : function(){ 
if(Sys.IE6){this._resize(); addListener(window,"resize", this._resize); } 
this.obj.style.display = "block"; 
}, 
Close : function(){ 
this.obj.style.display = "none"; 
if(Sys.IE6)removeListener(window,"resize", LightBox._resize); 
} 
} 
window.onload = function(){ 
var data = [{Class:"span0",hover:"span0_hover",title:"加粗",action:"Exec",args:"bold"}, 
{Class:"span1",hover:"span1_hover",title:"斜体",action:"Exec",args:"Italic"}, 
{Class:"span2",hover:"span2_hover",title:"下划线",action:"Exec",args:"Underline"}, 
{Class:"span3",hover:"span3_hover",title:"字号",action:"Fontsize",args:null}, 
{Class:"span4",hover:"span4_hover",title:"字体",action:"FontName",args:null}, 
{Class:"span5",hover:"span5_hover",title:"文字颜色",action:"Fontcolor",args:null}, 
{Class:"span6",hover:"span6_hover",title:"插入链接",action:"CreateLink",args:null}, 
{Class:"span7",hover:"span7_hover",title:"剪贴",action:"Exec",args:"Cut"}, 
{Class:"span8",hover:"span8_hover",title:"复制",action:"Exec",args:"Copy"}, 
{Class:"span9",hover:"span9_hover",title:"左对齐",action:"Exec",args:"JustifyLeft"}, 
{Class:"span10",hover:"span10_hover",title:"居中对齐",action:"Exec",args:"JustifyCenter"}, 
{Class:"span11",hover:"span11_hover",title:"右对齐",action:"Exec",args:"JustifyRight"}, 
{Class:"span12",hover:"span12_hover",title:"项目符号",action:"Exec",args:"InsertUnorderedList"}, 
{Class:"span13",hover:"span13_hover",title:"编号",action:"Exec",args:"InsertOrderedList"}, 
{Class:"span14",hover:"span14_hover",title:"插入表格",action:"Addtable",args:null}, 
{Class:"span15",hover:"span15_hover",title:"减少缩进",action:"Exec",args:"Outdent"}, 
{Class:"span16",hover:"span16_hover",title:"增加缩进",action:"Exec",args:"Indent"}, 
{Class:"span17",hover:"span17_hover",title:"清除样式",action:"Exec",args:"RemoveFormat"}, 
{Class:"span18",hover:"span18_hover",title:"插入图片",action:"InsertImage",args:null}, 
{Class:"span19",hover:"span19_hover",title:"插入表情",action:"Expression",args:null}, 
{Class:"span20",hover:"span20_hover",title:"自动排版",action:"Layout",args:null} 
]; 
new Editer($('ss'),data,LightBox.init()); 
} 
</script>

[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]