/* *********************************************************** Example 4-3 (DHTMLAPI.js) "Dynamic HTML:The Definitive Reference" 2nd Edition by Danny Goodman Published by O'Reilly & Associates ISBN 1-56592-494-0 http://www.oreilly.com Copyright 2002 Danny Goodman. All Rights Reserved. ************************************************************ */ // DHTMLapi.js custom API for cross-platform // object positioning by Danny Goodman (http://www.dannyg.com). // Release 2.0. Supports NN4, IE, and W3C DOMs. // Global variables var isCSS, isW3C, isIE4, isNN4, isIE6CSS; // Initialize upon load to let all browsers establish content objects function initDHTMLAPI() { if (document.images) { isCSS = (document.body && document.body.style) ? true : false; isW3C = (isCSS && document.getElementById) ? true : false; isIE4 = (isCSS && document.all) ? true : false; isNN4 = (document.layers) ? true : false; isIE6CSS = (document.compatMode && document.compatMode.indexOf("CSS1") >= 0) ? true : false; } } // Set event handler to initialize API window.onload = initDHTMLAPI; // Seek nested NN4 layer from string name function seekLayer(doc, name) { var theObj; for (var i = 0; i < doc.layers.length; i++) { if (doc.layers[i].name == name) { theObj = doc.layers[i]; break; } // dive into nested layers if necessary if (doc.layers[i].document.layers.length > 0) { theObj = seekLayer(document.layers[i].document, name); } } return theObj; } // Convert object name string or object reference // into a valid element object reference function getRawObject(obj) { var theObj; if (typeof obj == "string") { if (isW3C) { theObj = document.getElementById(obj); } else if (isIE4) { theObj = document.all(obj); } else if (isNN4) { theObj = seekLayer(document, obj); } } else { // pass through object reference theObj = obj; } return theObj; } // Convert object name string or object reference // into a valid style (or NN4 layer) reference function getObject(obj) { var theObj = getRawObject(obj); if (theObj && isCSS) { theObj = theObj.style; } return theObj; } // Position an object at a specific pixel coordinate function shiftTo(obj, x, y) { var theObj = getObject(obj); if (theObj) { if (isCSS) { // equalize incorrect numeric value type var units = (typeof theObj.left == "string") ? "px" : 0 theObj.left = x + units; theObj.top = y + units; } else if (isNN4) { theObj.moveTo(x,y) } } } // Move an object by x and/or y pixels function shiftBy(obj, deltaX, deltaY) { var theObj = getObject(obj); if (theObj) { if (isCSS) { // equalize incorrect numeric value type var units = (typeof theObj.left == "string") ? "px" : 0 theObj.left = getObjectLeft(obj) + deltaX + units; theObj.top = getObjectTop(obj) + deltaY + units; } else if (isNN4) { theObj.moveBy(deltaX, deltaY); } } } // Set the z-order of an object function setZIndex(obj, zOrder) { var theObj = getObject(obj); if (theObj) { theObj.zIndex = zOrder; } } // Set the background color of an object function setBGColor(obj, color) { var theObj = getObject(obj); if (theObj) { if (isNN4) { theObj.bgColor = color; } else if (isCSS) { theObj.backgroundColor = color; } } } // Set the visibility of an object to visible function show(obj) { var theObj = getObject(obj); if (theObj) { theObj.visibility = "visible"; } } // Set the visibility of an object to hidden function hide(obj) { var theObj = getObject(obj); if (theObj) { theObj.visibility = "hidden"; } } // Retrieve the x coordinate of a positionable object function getObjectLeft(obj) { var elem = getRawObject(obj); var result = 0; if (document.defaultView) { var style = document.defaultView; var cssDecl = style.getComputedStyle(elem, ""); result = cssDecl.getPropertyValue("left"); } else if (elem.currentStyle) { result = elem.currentStyle.left; } else if (elem.style) { result = elem.style.left; } else if (isNN4) { result = elem.left; } return parseInt(result); } // Retrieve the y coordinate of a positionable object function getObjectTop(obj) { var elem = getRawObject(obj); var result = 0; if (document.defaultView) { var style = document.defaultView; var cssDecl = style.getComputedStyle(elem, ""); result = cssDecl.getPropertyValue("top"); } else if (elem.currentStyle) { result = elem.currentStyle.top; } else if (elem.style) { result = elem.style.top; } else if (isNN4) { result = elem.top; } return parseInt(result); } // Retrieve the rendered width of an element function getObjectWidth(obj) { var elem = getRawObject(obj); var result = 0; if (elem.offsetWidth) { result = elem.offsetWidth; } else if (elem.clip && elem.clip.width) { result = elem.clip.width; } else if (elem.style && elem.style.pixelWidth) { result = elem.style.pixelWidth; } return parseInt(result); } // Retrieve the rendered height of an element function getObjectHeight(obj) { var elem = getRawObject(obj); var result = 0; if (elem.offsetHeight) { result = elem.offsetHeight; } else if (elem.clip && elem.clip.height) { result = elem.clip.height; } else if (elem.style && elem.style.pixelHeight) { result = elem.style.pixelHeight; } return parseInt(result); } // Return the available content width space in browser window function getInsideWindowWidth() { if (window.innerWidth) { return window.innerWidth; } else if (isIE6CSS) { // measure the html element's clientWidth return document.body.parentElement.clientWidth } else if (document.body && document.body.clientWidth) { return document.body.clientWidth; } return 0; } // Return the available content height space in browser window function getInsideWindowHeight() { if (window.innerHeight) { return window.innerHeight; } else if (isIE6CSS) { // measure the html element's clientHeight return document.body.parentElement.clientHeight } else if (document.body && document.body.clientHeight) { return document.body.clientHeight; } return 0; }
/*********************** SCROLLBAR CREATION ************************/ // Global variables var scrollEngaged = false; var scrollInterval; var scrollBars = new Array(); // Utility to retrieve effective style property function getElementStyle(elemID, IEStyleAttr, CSSStyleAttr) { var elem = document.getElementById(elemID); if (elem.currentStyle) { return elem.currentStyle[IEStyleAttr]; } else if (window.getComputedStyle) { var compStyle = window.getComputedStyle(elem, ""); return compStyle.getPropertyValue(CSSStyleAttr); } return ""; } // Scrollbar constructor function function scrollBar(rootID, ownerID, ownerContentID) { this.rootID = rootID; this.ownerID = ownerID; this.ownerContentID = ownerContentID; this.index = scrollBars.length; // one-time evaluations for use by other scroll bar manipulations this.rootElem = document.getElementById(rootID); this.ownerElem = document.getElementById(ownerID); this.contentElem = document.getElementById(ownerContentID); this.ownerHeight = parseInt(getElementStyle(ownerID, "height", "height")); this.ownerWidth = parseInt(getElementStyle(ownerID, "width", "width")); this.ownerBorder = parseInt(getElementStyle(ownerID, "borderTopWidth", "border-top-width")) * 2; this.contentHeight = Math.abs(parseInt(this.contentElem.style.top)); this.contentWidth = this.contentElem.offsetWidth; this.contentFontSize = parseInt(getElementStyle(this.ownerContentID, "fontSize", "font-size")); this.contentScrollHeight = this.contentElem.scrollHeight; // create quirks object whose default (CSS-compatible) values // are zero; pertinent values for quirks mode filled in later this.quirks = {on:false, ownerBorder:0, scrollBorder:0, contentPadding:0}; if (navigator.appName == "Microsoft Internet Explorer" && navigator.userAgent.indexOf("Win") != -1 && (typeof document.compatMode == "undefined" || document.compatMode == "BackCompat")) { this.quirks.on = true; this.quirks.ownerBorder = this.ownerBorder; this.quirks.contentPadding = parseInt(getElementStyle(ownerContentID, "padding", "padding")); } // determined at scrollbar initialization time this.scrollWrapper = null; this.upButton = null; this.dnButton = null; this.thumb = null; this.buttonLength = 0; this.thumbLength = 0; this.scrollWrapperLength = 0 this.dragZone = {left:0, top:0, right:0, bottom:0} // build a physical scrollbar for the root div this.appendScroll = appendScrollBar; } // Create scrollbar elements and append to the "pseudo-window" function appendScrollBar() { // button and thumb image sizes (programmer customizable) var imgH = 16; var imgW = 16; var thumbH = 27; // "up" arrow, needed first to help size scrollWrapper var lineup = document.createElement("img"); lineup.id = "lineup" + (scrollBars.length - 1); lineup.className = "lineup"; lineup.index = this.index; lineup.src = "scrollUp.gif"; lineup.height = imgH; lineup.width = imgW; lineup.alt = "Scroll Up"; lineup.style.position = "absolute"; lineup.style.top = "0px"; lineup.style.left = "0px"; // scrollWrapper defines "page" region color and 3-D borders var wrapper = document.createElement("div"); wrapper.id = "scrollWrapper" + (scrollBars.length - 1); wrapper.className = "scrollWrapper"; wrapper.index = this.index; wrapper.style.position = "absolute"; wrapper.style.visibility = "hidden"; wrapper.style.top = "0px"; wrapper.style.left = this.ownerWidth + this.ownerBorder - this.quirks.ownerBorder + "px"; wrapper.style.borderTop = "2px solid #666666"; wrapper.style.borderLeft = "2px solid #666666"; wrapper.style.borderRight= "2px solid #cccccc"; wrapper.style.borderBottom= "2px solid #cccccc"; wrapper.style.backgroundColor = "#999999"; if (this.quirks.on) { this.quirks.scrollBorder = 2; } wrapper.style.width = lineup.width + (this.quirks.scrollBorder * 2) + "px"; wrapper.style.height = this.ownerHeight + (this.ownerBorder - 4) - (this.quirks.scrollBorder * 2) + "px"; // "down" arrow var linedn = document.createElement("img"); linedn.id = "linedown" + (scrollBars.length - 1); linedn.className = "linedown"; linedn.index = this.index; linedn.src = "scrollDn.gif"; linedn.height = imgH; linedn.width = imgW; linedn.alt = "Scroll Down"; linedn.style.position = "absolute"; linedn.style.top = parseInt(this.ownerHeight) + (this.ownerBorder - 4) - (this.quirks.ownerBorder) - linedn.height + "px"; linedn.style.left = "0px"; // fixed-size draggable thumb var thumb = document.createElement("img"); thumb.id = "thumb" + (scrollBars.length - 1); thumb.index = this.index; thumb.src = "thumb.gif"; thumb.height = thumbH; thumb.width = imgW; thumb.alt = "Scroll Dragger"; thumb.style.position = "absolute"; thumb.style.top = lineup.height + "px"; thumb.style.width = imgW + "px"; thumb.style.height = thumbH + "px"; thumb.style.left = "0px"; // fill in scrollBar object properties from rendered elements this.upButton = wrapper.appendChild(lineup); this.thumb = wrapper.appendChild(thumb); this.dnButton = wrapper.appendChild(linedn); this.scrollWrapper = this.rootElem.appendChild(wrapper); this.buttonLength = imgH; this.thumbLength = thumbH; this.scrollWrapperLength = parseInt(getElementStyle(this.scrollWrapper.id, "height", "height")); this.dragZone.left = 0; this.dragZone.top = this.buttonLength; this.dragZone.right = this.buttonLength; this.dragZone.bottom = this.scrollWrapperLength - this.buttonLength - (this.quirks.scrollBorder * 2) // all events processed by scrollWrapper element this.scrollWrapper.onmousedown = handleScrollClick; this.scrollWrapper.onmouseup = handleScrollStop; this.scrollWrapper.oncontextmenu = blockEvent; this.scrollWrapper.ondrag = blockEvent; // OK to show this.scrollWrapper.style.visibility = "visible"; } /*************************** EVENT HANDLER FUNCTIONS ****************************/ // onmouse up handler function handleScrollStop() { scrollEngaged = false; } // Prevent Mac context menu while holding down mouse button function blockEvent(evt) { evt = (evt) ? evt : event; evt.cancelBubble = true; return false; } // click event handler function handleScrollClick(evt) { var fontSize, contentHeight; evt = (evt) ? evt : event; var target = (evt.target) ? evt.target : evt.srcElement; target = (target.nodeType == 3) ? target.parentNode : target; var index = target.index; fontSize = scrollBars[index].contentFontSize; switch (target.className) { case "lineup" : scrollEngaged = true; scrollBy(index, parseInt(fontSize)); scrollInterval = setInterval("scrollBy(" + index + ", " + parseInt(fontSize) + ")", 100); evt.cancelBubble = true; return false; break; case "linedown" : scrollEngaged = true; scrollBy(index, -(parseInt(fontSize))); scrollInterval = setInterval("scrollBy(" + index + ", -" + parseInt(fontSize) + ")", 100); evt.cancelBubble = true; return false; break; case "scrollWrapper" : scrollEngaged = true; var evtY = (evt.offsetY) ? evt.offsetY : ((evt.layerY) ? evt.layerY : -1); if (evtY >= 0) { var pageSize = scrollBars[index].ownerHeight - fontSize; var thumbElemStyle = scrollBars[index].thumb.style; // set value negative to push document upward if (evtY > (parseInt(thumbElemStyle.top) + scrollBars[index].thumbLength)) { pageSize = -pageSize; } scrollBy(index, pageSize); scrollInterval = setInterval("scrollBy(" + index + ", " + pageSize + ")", 100); evt.cancelBubble = true; return false; } } return false; } // Activate scroll of inner content function scrollBy(index, px) { var scroller = scrollBars[index]; var elem = document.getElementById(scroller.ownerContentID); var top = parseInt(elem.style.top); var scrollHeight = parseInt(elem.scrollHeight); var height = scroller.ownerHeight; if (scrollEngaged && top + px >= -scrollHeight + height && top + px <= 0) { shiftBy(elem, 0, px); updateThumb(index); } else if (top + px < -scrollHeight + height) { shiftTo(elem, 0, -scrollHeight + height - scroller.quirks.contentPadding); updateThumb(index); clearInterval(scrollInterval); } else if (top + px > 0) { shiftTo(elem, 0, 0); updateThumb(index); clearInterval(scrollInterval); } else { clearInterval(scrollInterval); } } /********************** SCROLLBAR TRACKING ***********************/ // Position thumb after scrolling by arrow/page region function updateThumb(index) { var scroll = scrollBars[index]; var barLength = scroll.scrollWrapperLength - (scroll.quirks.scrollBorder * 2); var buttonLength = scroll.buttonLength; barLength -= buttonLength * 2; var docElem = scroll.contentElem; var docTop = Math.abs(parseInt(docElem.style.top)); var scrollFactor = docTop/(scroll.contentScrollHeight - scroll.ownerHeight); shiftTo(scroll.thumb, 0, Math.round((barLength - scroll.thumbLength) * scrollFactor) + buttonLength); } // Position content per thumb location function updateScroll() { var index = selectedObj.index; var scroller = scrollBars[index];
var barLength = scroller.scrollWrapperLength - (scroller.quirks.scrollBorder * 2); var buttonLength = scroller.buttonLength; var thumbLength = scroller.thumbLength; var wellTop = buttonLength; var wellBottom = barLength - buttonLength - thumbLength; var wellSize = wellBottom - wellTop; var thumbTop = parseInt(getElementStyle(scroller.thumb.id, "top", "top")); var scrollFactor = (thumbTop - buttonLength)/wellSize; var docElem = scroller.contentElem; var docTop = Math.abs(parseInt(docElem.style.top)); var scrollHeight = scroller.contentScrollHeight; var height = scroller.ownerHeight; shiftTo(scroller.ownerContentID, 0, -(Math.round((scrollHeight - height) * scrollFactor))); } /******************* ELEMENT DRAGGING ********************/ // Global holds reference to selected element var selectedObj; // Globals hold location of click relative to element var offsetX, offsetY; var zone = {left:0, top:16, right:16, bottom:88}; // Set global reference to element being engaged and dragged function setSelectedElem(evt) { var target = (evt.target) ? evt.target : evt.srcElement; target = (target.nodeType && target.nodeType == 3) ? target.parentNode : target; var divID = (target.id.indexOf("thumb") != -1) ? target.id : ""; if (divID) { if (document.layers) { selectedObj = document.layers[divID]; } else if (document.all) { selectedObj = document.all(divID); } else if (document.getElementById) { selectedObj = document.getElementById(divID); } setZIndex(selectedObj, 100); return; } selectedObj = null; return; } // Drag thumb only within scrollbar region function dragIt(evt) { evt = (evt) ? evt : event; var x, y, width, height; if (selectedObj) { if (evt.pageX) { x = evt.pageX - offsetX; y = evt.pageY - offsetY; } else if (evt.clientX || evt.clientY) { x = evt.clientX - offsetX; y = evt.clientY - offsetY; } var index = selectedObj.index; var scroller = scrollBars[index]; var zone = scroller.dragZone; width = scroller.thumb.width; height = scroller.thumb.height; x = (x < zone.left) ? zone.left : ((x + width > zone.right) ? zone.right - width : x); y = (y < zone.top) ? zone.top : ((y + height > zone.bottom) ? zone.bottom - height : y); shiftTo(selectedObj, x, y); updateScroll(); evt.cancelBubble = true; return false; } } // Turn selected element on and set cursor offsets function engage(evt) { evt = (evt) ? evt : event; setSelectedElem(evt); if (selectedObj) { if (document.body && document.body.setCapture) { // engage event capture in IE/Win document.body.setCapture(); } if (evt.pageX) { offsetX = evt.pageX - ((typeof selectedObj.offsetLeft != "undefined") ? selectedObj.offsetLeft : selectedObj.left); offsetY = evt.pageY - ((selectedObj.offsetTop) ? selectedObj.offsetTop : selectedObj.top); } else if (typeof evt.clientX != "undefined") { offsetX = evt.clientX - ((selectedObj.offsetLeft) ? selectedObj.offsetLeft : 0); offsetY = evt.clientY - ((selectedObj.offsetTop) ? selectedObj.offsetTop : 0); } return false; } } // Turn selected element off function release(evt) { if (selectedObj) { setZIndex(selectedObj, 0); if (document.body && document.body.releaseCapture) { // stop event capture in IE/Win document.body.releaseCapture(); } selectedObj = null; } } // Assign event handlers used by both Navigator and IE function initDrag() { if (document.layers) { // turn on event capture for these events in NN4 event model document.captureEvents(Event.MOUSEDOWN | Event.MOUSEMOVE | Event.MOUSEUP); return; } else if (document.body & document.body.addEventListener) { // turn on event capture for these events in W3C DOM event model document.addEventListener("mousedown", engage, true); document.addEventListener("mousemove", dragIt, true); document.addEventListener("mouseup", release, true); return; } document.onmousedown = engage; document.onmousemove = dragIt; document.onmouseup = release; return; }
// Make a scrollBar object and build one on screen function initScrollbars() { scrollBars[0] = new scrollBar("pseudoWindow", "outerWrapper", "innerWrapper"); scrollBars[0].appendScroll(); }
Custom Scrollbar
Lorem ipsum dolor sit amet, consectetaur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim adminim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit involuptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deseruntmollit anim id est laborum Et harumd und lookum like Greek to me, dereud facilis est er expedit distinct. At vver eos et accusam dignissum qui blandit est praesent luptatum delenit aigueexcepteur sint occae. Et harumd dereud facilis est er expedit distinct. Nam libe soluta nobis eligent optio est congue nihil impedit doming idLorem ipsum dolor sit amet, consectetur adipiscing elit, set eiusmod tempor incidunt et labore et dolore magna aliquam. Ut enim ad minimveniam, quis nostrud exerc. Irure dolor in reprehend incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrudexercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse molestaiecillum. Tia non ob ea soluad incommod quae egen ium improb fugiend. Officia deserunt mollit anim id est laborum Et harumd dereud facilisest er expedit distinct. Nam liber te conscient to factor tum poen legum odioque civiuda et tam. Neque pecun modut est neque nonor et imperned libidig met, consectetur adipiscing elit, sed ut labore et dolore magna aliquam is nostrud exercitation ullam mmodo consequet. Duis aute involuptate velit esse cillum dolore eu fugiat nulla pariatur. At vver eos et accusam dignissum qui blandit est praesent. Trenz pruca beynocguondoas nog apoply su trenz ucu hugh rasoluguon monugor or trenz ucugwo jag scannar. Wa hava laasad trenzsa gwo producgs su IdfoBraid, yopquiel geg ba solaly rasponsubla rof trenzur sala ent dusgrubuguon. Offoctivo immoriatoly, hawrgasi pwicos asi sirucor.Thas sirutciun appliostyu thuso itoms ghuso pwicos gosi sirucor in mixent gosi sirucor ic mixent ples cak ontisi sowios uf Zerm hawr rwivos. Unte af phen neigepheings atoot Prexs eis phat eit sakem eit vory gast te Plok peish ba useing phen roxas. Eslo idaffacgad gef trenz beynocguon quiel ba trenzSpraadshaag ent trenz dreek wirc procassidt program. Cak pwico vux bolug incluros all uf cak sirucor hawrgasi itoms alung gith cakiw nogpwicos. Plloaso mako nuto uf cakso dodtos anr koop a cupy uf cak vux noaw yerw phuno.