本文實例講述了JavaScript實現DIV層拖動及動態增加新層的方法。分享給大家供大家參考。具體分析如下：
無刷新添加一個新的DIV層，並可實現的該層的拖動，鼠標拖動層可移動位置，將JS部分另存為一個新文件，用到的時候從外部引入，這個拖動層代碼很流行，GG和YAHOO等大網站經常可以看到這種效果。
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>DIV層拖動，動態增加新層的JavaScript</title> <style> body {margin:0px;padding:0px;font-size:12px;text-align:center;} body > div {text-align:center; margin-right:auto; margin-left:auto;} .content{width:900px;} .content .left{ float:left; width:20%; border:1px solid #0066CC; margin:3px; } .content .center{ float:left; border:1px solid #FF0000; margin:3px; width:57% } .content .right{ float:right; width:20%; border:1px solid #FF0000; margin:3px } .mo{ height:auto; border:1px solid #CCC; margin:3px; background:#FFF } .mo h1{ background:#ECF9FF; height:18px; padding:3px; cursor:move } .closediv{ cursor:default; } .minusspan{ cursor:default; } .mo .nr{ height:80px; border:1px solid #F3F3F3; margin:2px } h1{ margin:0px; padding:0px; text-align:left; font-size:12px } .dragging { FILTER: progid:DXImageTransform.Microsoft.Alpha(opacity=60); opacity: 0.6; moz-opacity: 0.6 } </style> <script language="javascript"> var dragobj={} window.onerror=function(){return false} var domid=12 function on_ini(){ String.prototype.inc=function(s){return this.indexOf(s)>-1?true:false} var agent=navigator.userAgent window.isOpr=agent.inc("Opera") window.isIE=agent.inc("IE") && !isOpr window.isMoz=agent.inc("Mozilla") && !isOpr && !isIE if(isMoz){ Event.prototype.__defineGetter__("x",function(){return this.clientX+2}) Event.prototype.__defineGetter__("y",function(){return this.clientY+2}) } basic_ini() } function basic_ini(){ window.$=function(obj){return typeof(obj)=="string"?document.getElementById(obj):obj} window.oDel=function(obj){if($(obj)!=null){$(obj).parentNode.removeChild($(obj))}} } window.oDel=function(obj){if($(obj)!=null){$(obj).parentNode.removeChild($(obj))}} window.onload=function(){ on_ini() var o=document.getElementsByTagName("h1") for(var i=0;i<o.length;i++){ o[i].onmousedown=addevent; //添加折疊和關閉按鈕 var tt = document.createElement("div"); tt.style.cssText = "float:left"; var span = document.createElement("span"); span.innerHTML = "--"+o[i].innerHTML; span.style.cssText = "cursor:default;"; span.onmousedown = minusDiv; tt.appendChild(span); var close = document.createElement("div"); close.innerHTML = "X"; close.style.cssText = "cursor:default;float:right"; close.onmousedown = closeDiv; o[i].innerHTML = ""; o[i].appendChild(tt); o[i].appendChild(close); } } //折疊或者顯示層 function minusDiv(e) { e=e||event var nr = this.parentNode.parentNode.nextSibling; //取得內容層 nr.style.display = nr.style.display==""?"none":""; } //移出層 function closeDiv(e) { e=e||event var mdiv = this.parentNode.parentNode; //取得目標層 oDel(mdiv); } function addevent(e){ if(dragobj.o!=null) return false e=e||event dragobj.o=this.parentNode dragobj.xy=getxy(dragobj.o) dragobj.xx=new Array((e.x-dragobj.xy[1]),(e.y-dragobj.xy[0])) //dragobj.o.className = 'dragging'; dragobj.o.style.width=dragobj.xy[2]+"px" dragobj.o.style.height=dragobj.xy[3]+"px" dragobj.o.style.left=(e.x-dragobj.xx[0])+"px" dragobj.o.style.top=(e.y-dragobj.xx[1])+"px" dragobj.o.style.position="absolute" dragobj.o.style.filter='alpha(opacity=60)'; //添加拖動透明效果 var om=document.createElement("div") dragobj.otemp=om om.style.width=dragobj.xy[2]+"px" om.style.height=dragobj.xy[3]+"px" om.style.border = "1px dashed red"; //ikaiser添加，實現虛線框 dragobj.o.parentNode.insertBefore(om,dragobj.o) return false } document.onselectstart=function(){return false} window.onfocus=function(){document.onmouseup()} window.onblur=function(){document.onmouseup()} document.onmouseup=function(){ if(dragobj.o!=null){ dragobj.o.style.width="auto" dragobj.o.style.height="auto" dragobj.otemp.parentNode.insertBefore(dragobj.o,dragobj.otemp) dragobj.o.style.position="" oDel(dragobj.otemp) dragobj={} } } document.onmousemove=function(e){ e=e||event if(dragobj.o!=null){ dragobj.o.style.left=(e.x-dragobj.xx[0])+"px" dragobj.o.style.top=(e.y-dragobj.xx[1])+"px" createtmpl(e, dragobj.o) //傳遞當前拖動對象 } } function getxy(e){ var a=new Array() var t=e.offsetTop; var l=e.offsetLeft; var w=e.offsetWidth; var h=e.offsetHeight; while(e=e.offsetParent){ t+=e.offsetTop; l+=e.offsetLeft; } a[0]=t;a[1]=l;a[2]=w;a[3]=h return a; } function inner(o,e){ var a=getxy(o) if(e.x>a[1] && e.x<(a[1]+a[2]) && e.y>a[0] && e.y<(a[0]+a[3])){ if(e.y<(a[0]+a[3]/2)) return 1; else return 2; }else return 0; } //將當前拖動層在拖動時可變化大小，預覽效果 function createtmpl(e, elm){ for(var i=0;i<domid;i++){ if(document.getElementById("m"+i) == null) //已經移出的層不再遍歷 continue; if($("m"+i)==dragobj.o) continue var b=inner($("m"+i),e) if(b==0) continue dragobj.otemp.style.width=$("m"+i).offsetWidth elm.style.width = $("m"+i).offsetWidth; //1為下移，2為上移 if(b==1){ $("m"+i).parentNode.insertBefore(dragobj.otemp,$("m"+i)) }else{ if($("m"+i).nextSibling==null){ $("m"+i).parentNode.appendChild(dragobj.otemp) }else{ $("m"+i).parentNode.insertBefore(dragobj.otemp,$("m"+i).nextSibling) } } return } for(var j=0;j<3;j++){ if($("dom"+j).innerHTML.inc("div")||$("dom"+j).innerHTML.inc("DIV")) continue var op=getxy($("dom"+j)) if(e.x>(op[1]+10) && e.x<(op[1]+op[2]-10)){ $("dom"+j).appendChild(dragobj.otemp) dragobj.otemp.style.width=(op[2]-10)+"px" } } } function add_div() { var o=document.createElement("div") o.className="mo" o.id="m"+domid $('dom0').appendChild(o) o.innerHTML="<h1>dom"+domid+"</h1><div class=nr></div>" o.getElementsByTagName("h1")[0].onmousedown=addevent domid++ } </script> </head> <body> <INPUT TYPE="button" value="添加一個新的DIV層" onclick="add_div();"> <div class=content> <div class=left id=dom0> <div class=mo id=m0> <h1>dom0</h1> <div class="nr"></div> </div> <div class=mo id=m1> <h1>dom1</h1><div class="nr"></div> </div> <div class=mo id=m2><h1>dom2</h1><div class="nr"></div></div> <div class=mo id=m3><h1>dom3</h1><div class="nr"></div></div> </div> <div class=center id=dom1> <div class=mo id=m4><h1>dom4</h1><div class="nr"></div></div> <div class=mo id=m5><h1>dom5</h1><div class="nr"></div></div> </div> <div class=right id=dom2> <div class=mo id=m8><h1>dom8</h1><div class="nr"></div></div> <div class=mo id=m9><h1>dom9</h1><div class="nr"></div></div> </div> </div> </body> </html>希望本文所述對大家的javascript程序設計有所幫助。