JavaScript DHTML/HTML/DIV
Scrolling div Content
<source lang="html4strict"> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/tr/xhtml1/DTD/xhtml1-transitional.dtd">
<html> <head> <title></title> <style rel="stylesheet" id="mainStyle" type="text/css"> html {background-color:#cccccc} body {background-color:#eeeeee; font-family:Tahoma,Arial,Helvetica,sans-serif; font-size:12px;
margin-left:15%; margin-right:15%; border:3px groove darkred; padding:15px}
h1 {text-align:right; font-size:1.5em; font-weight:bold} h2 {text-align:left; font-size:1.1em; font-weight:bold; text-decoration:underline} .buttons {margin-top:10px} </style> <script language="JavaScript" type="text/javascript"> /* *********************************************************** 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.ru Copyright 2002 Danny Goodman. All Rights Reserved.
- */
// DHTMLapi.js custom API for cross-platform // object positioning by Danny Goodman (http://www.dannyg.ru). // 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.rupatMode && document.rupatMode.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;
}
</script> <script language="JavaScript" type="text/javascript"> var scrollEngaged = false; var scrollInterval; var scrollBars = new Array(); 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 "";
} function scrollBar(ownerID, ownerContentID, upID, dnID) {
this.ownerID = ownerID;
this.ownerContentID = ownerContentID;
this.index = scrollBars.length;
this.upButton = document.getElementById(upID);
this.dnButton = document.getElementById(dnID);
this.upButton.index = this.index;
this.dnButton.index = this.index;
this.ownerHeight = parseInt(getElementStyle(this.ownerID, "height", "height"));
this.contentElem = document.getElementById(ownerContentID);
this.contentFontSize = parseInt(getElementStyle(this.ownerContentID,
"fontSize", "font-size"));
this.contentScrollHeight = (this.contentElem.scrollHeight) ?
this.contentElem.scrollHeight : this.contentElem.offsetHeight;
this.initScroll = initScroll;
} function initScroll() {
this.upButton.onmousedown = handleScrollClick;
this.upButton.onmouseup = handleScrollStop;
this.upButton.oncontextmenu = blockEvent;
this.dnButton.onmousedown = handleScrollClick;
this.dnButton.onmouseup = handleScrollStop;
this.dnButton.oncontextmenu = blockEvent;
var isIEMac = (navigator.appName.indexOf("Explorer") != -1 && navigator.userAgent.indexOf("Mac") != -1);
if (!isIEMac) {
document.getElementById("innerWrapper0").style.overflow = "hidden";
}
} function handleScrollStop() {
scrollEngaged = false;
} function blockEvent(evt) {
evt = (evt) ? evt : event; evt.cancelBubble = true; return false;
} function handleScrollClick(evt) {
var fontSize;
evt = (evt) ? evt : event;
var target = (evt.target) ? evt.target : evt.srcElement;
var index = target.index;
fontSize = scrollBars[index].contentFontSize;
fontSize = (target.className == "lineup") ? fontSize : -fontSize;
scrollEngaged = true;
scrollBy(index, parseInt(fontSize));
scrollInterval = setInterval("scrollBy(" + index + ", " +
parseInt(fontSize) + ")", 100);
evt.cancelBubble = true;
return false;
} function scrollBy(index, px) {
var scroller = scrollBars[index];
var elem = document.getElementById(scroller.ownerContentID);
var top = parseInt(elem.style.top);
var scrollHeight = parseInt(scroller.contentScrollHeight);
var height = scroller.ownerHeight;
if (scrollEngaged && top + px >= -scrollHeight + height && top + px <= 0) {
shiftBy(elem, 0, px);
} else {
clearInterval(scrollInterval);
}
} </script> <script type="text/javascript"> function initScrollers() {
scrollBars[0] = new scrollBar("outerWrapper0", "innerWrapper0", "lineup0",
"linedown0");
scrollBars[0].initScroll();
} </script> </head> <body style="height:400px" onload="initDHTMLAPI(); initScrollers()">
Scrolling div Content
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 officia deseruntmollit anim id est laborum Et harumd und lookum like Greek to me, dereud facilis est expedit distinct.
<img id="lineup0" class="lineup" src="scrollUp.gif" height="16" width="16"
alt="Scroll Up" style="position:absolute; top:10px; left:112px" />
<img id="linedown0" class="linedown" src="scrollDn.gif" height="16" width="16"
alt="Scroll Down" style="position:absolute; top:128px; left:112px" />
</body> </html>
</source>
Using the "div" Tag
<source lang="html4strict">
<html> <head>
<title>JavaScript Unleashed</title>
</head> <body>
Before the first block.
DIV 1
After the first block.
Before the second block.
DIV 2
I am inside the second DIV block.
After the second block.
</body> </html>
</source>
