I have put this code into a file named "dynlayer.js" and will be calling that file throughout this tutorial.
// Dynamic Layer Object // Copyright 1999 Dan Steinman // Available at the Dynamic Duo (http://www.dansteinman.com/dynduo/) // Last Updated Feb 16, 1999. // In order to use this code you must keep this disclaimer ns4 = (document.layers)? true:false ie4 = (document.all)? true:false function DynLayer(id,nestref,frame) { if (!DynLayerInit.set && !frame) DynLayerInit() if (ns4) { if (!frame) { if (!nestref) var nestref = DynLayerInit.nestRefArray[id] if (!DynLayerTest(id,nestref)) return this.css = (nestref)? eval("document."+nestref+".document."+id) : document.layers[id] } else this.css = (nestref)? eval("parent."+frame+".document."+nestref+".document."+id) : parent.frames[frame].document.layers[id] this.x = this.css.left this.y = this.css.top } else if (ie4) { this.css = (frame)? parent.frames[frame].document.all[id].style : document.all[id].style this.x = this.css.pixelLeft this.y = this.css.pixelTop } this.id = id this.w = (ns4)? this.css.clip.width : this.css.pixelWidth this.h = (ns4)? this.css.clip.height : this.css.pixelHeight this.doc = (ns4)? this.css.document : document if (ns4) this.event = this.css if (ie4) this.event = (frame)? parent.frames[frame].document.all[id] : document.all[id] this.obj = id + "DynLayer" eval(this.obj + "=this") this.moveTo = DynLayerMoveTo this.moveBy = DynLayerMoveBy this.show = DynLayerShow this.hide = DynLayerHide this.slideInit = DynLayerSlideInit this.clipInit = DynLayerClipInit this.write = DynLayerWrite } function DynLayerMoveTo(x,y) { if (x!=null) { this.x = x this.css.left = this.x } if (y!=null) { this.y = y this.css.top = this.y } } function DynLayerMoveBy(x,y) { this.moveTo(this.x+x,this.y+y) } function DynLayerShow() { this.css.visibility = (ns4)? "show" : "visible" } function DynLayerHide() { this.css.visibility = (ns4)? "hide" : "hidden" } function DynLayerSlideInit() { this.slideTo = DynLayerSlideTo this.slideBy = DynLayerSlideBy this.slideStart = DynLayerSlideStart this.slide = DynLayerSlide this.onSlide = new Function("") this.onSlideEnd = new Function("") } function DynLayerSlideTo(endx,endy,inc,speed,fn) { if (endx==null) endx = this.x if (endy==null) endy = this.y var distx = endx-this.x var disty = endy-this.y this.slideStart(endx,endy,distx,disty,inc,speed,fn) } function DynLayerSlideBy(distx,disty,inc,speed,fn) { var endx = this.x + distx var endy = this.y + disty this.slideStart(endx,endy,distx,disty,inc,speed,fn) } function DynLayerSlideStart(endx,endy,distx,disty,inc,speed,fn) { if (this.slideActive) return if (!inc) inc = 10 if (!speed) speed = 20 var num = Math.sqrt(Math.pow(distx,2) + Math.pow(disty,2))/inc if (num==0) return var dx = distx/num var dy = disty/num if (!fn) fn = null this.slideActive = true this.slide(dx,dy,endx,endy,num,1,speed,fn) } function DynLayerSlide(dx,dy,endx,endy,num,i,speed,fn) { if (!this.slideActive) return if (i++ < num) { this.moveBy(dx,dy) this.onSlide() if (this.slideActive) setTimeout(this.obj+".slide("+dx+","+dy+","+endx+","+endy+","+num+","+i+","+speed+",\""+fn+"\")",speed) else this.onSlideEnd() } else { this.slideActive = false this.moveTo(endx,endy) eval(fn) this.onSlideEnd() } } function DynLayerClipInit(clipTop,clipRight,clipBottom,clipLeft) { this.clipTo = DynLayerClipTo this.clipBy = DynLayerClipBy this.clipValues = DynLayerClipValues if (ie4) { if (arguments.length==4) this.clipTo(clipTop,clipRight,clipBottom,clipLeft) else this.clipTo(0,this.w,this.h,0) } } function DynLayerClipTo(t,r,b,l) { if (t==null) t = this.clipValues('t') if (r==null) r = this.clipValues('r') if (b==null) b = this.clipValues('b') if (l==null) l = this.clipValues('l') if (ns4) { this.css.clip.top = t this.css.clip.right = r this.css.clip.bottom = b this.css.clip.left = l } else if (ie4) this.css.clip = "rect("+t+"px "+r+"px "+b+"px "+l+"px)" } function DynLayerClipBy(t,r,b,l) { this.clipTo(this.clipValues('t')+t,this.clipValues('r')+r,this.clipValues('b')+b,this.clipValues('l')+l) } function DynLayerClipValues(which) { if (ie4) var clipv = this.css.clip.split("rect(")[1].split(")")[0].split("px") if (which=="t") return (ns4)? this.css.clip.top : Number(clipv[0]) if (which=="r") return (ns4)? this.css.clip.right : Number(clipv[1]) if (which=="b") return (ns4)? this.css.clip.bottom : Number(clipv[2]) if (which=="l") return (ns4)? this.css.clip.left : Number(clipv[3]) } function DynLayerWrite(html) { if (ns4) { this.doc.open() this.doc.write(html) this.doc.close() } else if (ie4) { this.event.innerHTML = html } } function DynLayerTest(id,nestref) { var ref = new Array() if (nestref) ref = nestref.split('.document.') ref[ref.length] = id var refstr = (ns4)? 'document.'+ref[0] : 'document.all.'+ref[0] for (var i=1; i<=ref.length; i++) { if (eval(refstr)) { if (ref.length==i) return true else refstr += (ns4)? '.document.'+ref[i] : '.all.'+ref[i] } else { var str ='DynLayer Error:' for (j in ref) { str += '\n'+ref[j] if (j==i-1) str += ' <-- this layer cannot be found' } if (DynLayerTest.count++<5) alert(str) else alert("Too many DynLayer errors, quitting.") return false } } return false } DynLayerTest.count = 0 function DynLayerInit(nestref) { if (!DynLayerInit.set) DynLayerInit.set = true if (ns4) { if (nestref) ref = eval('document.'+nestref+'.document') else {nestref = ''; ref = document;} for (var i=0; i<ref.layers.length; i++) { var divname = ref.layers[i].name DynLayerInit.nestRefArray[divname] = nestref var index = divname.indexOf("Div") if (index > 0) { eval(divname.substr(0,index)+' = new DynLayer("'+divname+'","'+nestref+'")') } if (ref.layers[i].document.layers.length > 0) { DynLayerInit.refArray[DynLayerInit.refArray.length] = (nestref=='')? ref.layers[i].name : nestref+'.document.'+ref.layers[i].name } } if (DynLayerInit.refArray.i < DynLayerInit.refArray.length) { DynLayerInit(DynLayerInit.refArray[DynLayerInit.refArray.i++]) } } else if (ie4) { for (var i=0; i<document.all.tags("DIV").length; i++) { var divname = document.all.tags("DIV")[i].id var index = divname.indexOf("Div") if (index > 0) { eval(divname.substr(0,index)+' = new DynLayer("'+divname+'")') } } } return true } DynLayerInit.nestRefArray = new Array() DynLayerInit.refArray = new Array() DynLayerInit.refArray.i = 0 DynLayerInit.set = false function css(id,left,top,width,height,color,vis,z) { if (id=="START") return '<STYLE TYPE="text/css">\n' else if (id=="END") return '</STYLE>' var str = (left!=null && top!=null)? '#'+id+' {position:absolute; left:'+left+'px; top:'+top+'px;' : '#'+id+' {position:relative;' if (arguments.length>=4 && width!=null) str += ' width:'+width+'px;' if (arguments.length>=5 && height!=null) str += ' height:'+height+'px; clip:rect(0px '+width+'px '+height+'px 0px);' if (arguments.length>=6 && color!=null) str += (ns4)? ' layer-background-color:'+color+';' : ' background-color:'+color+';' if (arguments.length>=7 && vis!=null) str += ' visibility:'+vis+';' if (arguments.length>=8 && z!=null) str += ' z-index:'+z+';' str += '}\n' return str } function writeCSS(str,showAlert) { str = css('START')+str+css('END') document.write(str) if (showAlert) alert(str) }
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