/* *********************************************************** 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; }
// Center a positionable element whose name is passed as // a parameter in the current window/frame, and show it function centerOnWindow(elemID) { // 'obj' is the positionable object var obj = getRawObject(elemID); // window scroll factors var scrollX = 0, scrollY = 0; if (document.body && typeof document.body.scrollTop != "undefined") { scrollX += document.body.scrollLeft; scrollY += document.body.scrollTop; if (document.body.parentNode && typeof document.body.parentNode.scrollTop != "undefined") { scrollX += document.body.parentNode.scrollLeft; scrollY += document.body.parentNode.scrollTop } } else if (typeof window.pageXOffset != "undefined") { scrollX += window.pageXOffset; scrollY += window.pageYOffset; } var x = Math.round((getInsideWindowWidth()/2) - (getObjectWidth(obj)/2)) + scrollX; var y = Math.round((getInsideWindowHeight()/2) - (getObjectHeight(obj)/2)) + scrollY; shiftTo(obj, x, y); show(obj); } function initProgressBar() { // create quirks object whose default (CSS-compatible) values // are zero; pertinent values for quirks mode filled in later if (navigator.appName == "Microsoft Internet Explorer" && navigator.userAgent.indexOf("Win") != -1 && (typeof document.compatMode == "undefined" || document.compatMode == "BackCompat")) { document.getElementById("progressBar").style.height = "81px"; document.getElementById("progressBar").style.width = "444px"; document.getElementById("sliderWrapper").style.fontSize = "xx-small"; document.getElementById("slider").style.fontSize = "xx-small"; document.getElementById("slider").style.height = "13px"; document.getElementById("slider").style.width = "415px"; } } function showProgressBar() { centerOnWindow("progressBar"); } function calcProgress(current, total) { if (current <= total) { var factor = current/total; var pct = Math.ceil(factor * 100); document.getElementById("sliderWrapper").firstChild.nodeValue = pct + "%"; document.getElementById("slider").firstChild.nodeValue = pct + "%"; document.getElementById("slider").style.clip = "rect(0px " + parseInt(factor * 417) + "px 16px 0px)"; } } function hideProgressBar() { hide("progressBar"); calcProgress(0, 0); } // Test bench to see progress bar in action at random intervals var loopObject = {start:0, end:10, current:0, interval:null}; function runit() { if (loopObject.current <= loopObject.end) { calcProgress(loopObject.current, loopObject.end); loopObject.current += Math.random(); loopObject.interval = setTimeout("runit()", 700); } else { calcProgress(loopObject.end, loopObject.end); loopObject.current = 0; loopObject.interval = null; setTimeout("hideProgressBar()", 500); } } function test() { showProgressBar(); runit(); }