图片展示js特效

Posted 2020-08-31 鸡鸣星

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html 代码片段，做一个table表格

Css样式表

#lightbox{
background-color:#fff;
padding: 0px;
}
#picboder{
border:#f4f4f4 6px solid;
}
#lightboxDetails{
font-size: 0.8em;
padding-top: 0.4em;
}
#lightboxCaption{ float: left; }
#keyboardMsg{ float: right; }

#closeButton{
top: 0px; right: 0px;
}

#lightbox img{ border: none; clear: both;}
#overlay img{ border: none; }

#overlay{background-color: #333;}

* html #overlay{
background-color: transparent;
filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src="images/overlay.png", sizingMethod="scale");
}

js demo

var loadingImage = \'images/loading.gif\';
var closeButton = \'images/close.gif\';

function getPageScroll(){

var yScroll;

if (self.pageYOffset) {
yScroll = self.pageYOffset;
} else if (document.documentElement && document.documentElement.scrollTop){ // Explorer 6 Strict
yScroll = document.documentElement.scrollTop;
} else if (document.body) {// all other Explorers
yScroll = document.body.scrollTop;
}

arrayPageScroll = new Array(\'\',yScroll)
return arrayPageScroll;
}

// for small pages with total width less then width of the viewport
if(xScroll < windowWidth){
pageWidth = windowWidth;
} else {
pageWidth = xScroll;
}

arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight)
return arrayPageSize;
}

//
// pause(numberMillis)
// Pauses code execution for specified time. Uses busy code, not good.
// Code from http://www.faqts.com/knowledge_base/view.phtml/aid/1602
//
function pause(numberMillis) {
var now = new Date();
var exitTime = now.getTime() + numberMillis;
while (true) {
now = new Date();
if (now.getTime() > exitTime)
return;
}
}

//
// getKey(key)
// Gets keycode. If \'x\' is pressed then it hides the lightbox.
//

function getKey(e){
if (e == null) { // ie
keycode = event.keyCode;
} else { // mozilla
keycode = e.which;
}
key = String.fromCharCode(keycode).toLowerCase();

if(key == \'x\'){ hideLightbox(); }
}

//
// listenKey()
//
function listenKey () { document.onkeypress = getKey; }

//
// showLightbox()
// Preloads images. Pleaces new image in lightbox then centers and displays.
//
function showLightbox(objLink)
{
// prep objects
var objOverlay = document.getElementById(\'overlay\');
var objLightbox = document.getElementById(\'lightbox\');
var objCaption = document.getElementById(\'lightboxCaption\');
var objImage = document.getElementById(\'lightboxImage\');
var objLoadingImage = document.getElementById(\'loadingImage\');
var objLightboxDetails = document.getElementById(\'lightboxDetails\');

var arrayPageSize = getPageSize();
var arrayPageScroll = getPageScroll();

// center loadingImage if it exists
if (objLoadingImage) {
objLoadingImage.style.top = (arrayPageScroll[1] + ((arrayPageSize[3] - 35 - objLoadingImage.height) / 2) + \'px\');
objLoadingImage.style.left = (((arrayPageSize[0] - 45 - objLoadingImage.width) / 2) + \'px\');
objLoadingImage.style.display = \'block\';
}

// set height of Overlay to take up whole page and show
objOverlay.style.height = (arrayPageSize[1] + \'px\');
objOverlay.style.display = \'block\';

// preload image
imgPreload = new Image();

imgPreload.onload=function(){
objImage.src = objLink.href;

// center lightbox and make sure that the top and left values are not negative
// and the image placed outside the viewport
var lightboxTop = arrayPageScroll[1] + ((arrayPageSize[3] - 35 - imgPreload.height) / 2);
var lightboxLeft = ((arrayPageSize[0] - 9 - imgPreload.width) / 2);

objLightbox.style.top = (lightboxTop < 0) ? "0px" : lightboxTop + "px";
objLightbox.style.left = (lightboxLeft < 0) ? "0px" : lightboxLeft + "px";

objLightboxDetails.style.width = imgPreload.width + \'px\';

if(objLink.getAttribute(\'title\')){
objCaption.style.display = \'block\';
//objCaption.style.width = imgPreload.width + \'px\';
objCaption.innerHTML = objLink.getAttribute(\'title\');
} else {
objCaption.style.display = \'none\';
}

// A small pause between the image loading and displaying is required with IE,
// this prevents the previous image displaying for a short burst causing flicker.
if (navigator.appVersion.indexOf("MSIE")!=-1){
pause(250);
}

if (objLoadingImage) { objLoadingImage.style.display = \'none\'; }

// Hide select boxes as they will \'peek\' through the image in IE
selects = document.getElementsByTagName("select");
for (i = 0; i != selects.length; i++) {
selects[i].style.visibility = "hidden";
}

objLightbox.style.display = \'block\';

// After image is loaded, update the overlay height as the new image might have
// increased the overall page height.
arrayPageSize = getPageSize();
objOverlay.style.height = (arrayPageSize[1] + \'px\');

// Check for \'x\' keypress
listenKey();

return false;
}

imgPreload.src = objLink.href;

}

//
// hideLightbox()
//
function hideLightbox()
{
// get objects
objOverlay = document.getElementById(\'overlay\');
objLightbox = document.getElementById(\'lightbox\');

// hide lightbox and overlay
objOverlay.style.display = \'none\';
objLightbox.style.display = \'none\';

// make select boxes visible
selects = document.getElementsByTagName("select");
for (i = 0; i != selects.length; i++) {
selects[i].style.visibility = "visible";
}

// disable keypress listener
document.onkeypress = \'\';
}

//
// initLightbox()
// Function runs on window load, going through link tags looking for rel="lightbox".
// These links receive onclick events that enable the lightbox display for their targets.
// The function also inserts html markup at the top of the page which will be used as a
// container for the overlay pattern and the inline image.
//
function initLightbox()
{

if (!document.getElementsByTagName){ return; }
var anchors = document.getElementsByTagName("a");

// loop through all anchor tags
for (var i=0; i<anchors.length; i++){
var anchor = anchors[i];

if (anchor.getAttribute("href") && (anchor.getAttribute("rel") == "lightbox")){
anchor.onclick = function () {showLightbox(this); return false;}
}
}

// the rest of this code inserts html at the top of the page that looks like this:
//
// <div id="overlay">
// <a href="#" onclick="hideLightbox(); return false;"><img id="loadingImage" /></a>
// </div>
// <div id="lightbox">
// <a href="#" onclick="hideLightbox(); return false;" title="Click anywhere to close image">
// <img id="closeButton" />
// <img id="lightboxImage" />
// </a>
// <div id="lightboxDetails">
// <div id="lightboxCaption"></div>
// <div id="keyboardMsg"></div>
// </div>
// </div>

var objBody = document.getElementsByTagName("body").item(0);

// create overlay div and hardcode some functional styles (aesthetic styles are in CSS file)
var objOverlay = document.createElement("div");
objOverlay.setAttribute(\'id\',\'overlay\');
objOverlay.onclick = function () {hideLightbox(); return false;}
objOverlay.style.display = \'none\';
objOverlay.style.position = \'absolute\';
objOverlay.style.top = \'0\';
objOverlay.style.left = \'0\';
objOverlay.style.zIndex = \'90\';
objOverlay.style.width = \'100%\';
objBody.insertBefore(objOverlay, objBody.firstChild);

var arrayPageSize = getPageSize();
var arrayPageScroll = getPageScroll();

// preload and create loader image
var imgPreloader = new Image();

// if loader image found, create link to hide lightbox and create loadingimage
imgPreloader.onload=function(){

var objLoadingImageLink = document.createElement("a");
objLoadingImageLink.setAttribute(\'href\',\'#\');
objLoadingImageLink.onclick = function () {hideLightbox(); return false;}
objOverlay.appendChild(objLoadingImageLink);

var objLoadingImage = document.createElement("img");
objLoadingImage.src = loadingImage;
objLoadingImage.setAttribute(\'id\',\'loadingImage\');
objLoadingImage.style.position = \'absolute\';
objLoadingImage.style.zIndex = \'150\';
objLoadingImageLink.appendChild(objLoadingImage);

imgPreloader.onload=function(){}; // clear onLoad, as IE will flip out w/animated gifs

return false;
}

imgPreloader.src = loadingImage;

// create lightbox div, same note about styles as above
var objLightbox = document.createElement("div");
objLightbox.setAttribute(\'id\',\'lightbox\');
objLightbox.style.display = \'none\';
objLightbox.style.position = \'absolute\';
objLightbox.style.zIndex = \'100\';
objBody.insertBefore(objLightbox, objOverlay.nextSibling);

// create link
var objLink = document.createElement("a");
objLink.setAttribute(\'href\',\'#\');
objLink.setAttribute(\'title\',\'Click to close\');
objLink.onclick = function () {hideLightbox(); return false;}
objLightbox.appendChild(objLink);

// preload and create close button image
var imgPreloadCloseButton = new Image();

// if close button image found,
imgPreloadCloseButton.onload=function(){
//var objCloseButtonDIV=document.createElement("div");
//objCloseButtonDIV.setAttribute(\'id\',\'closeButton\');
//objCloseButtonDIV.innerHTML=\'\';
var objCloseButton = document.createElement("img");
objCloseButton.src = closeButton;
objCloseButton.setAttribute(\'id\',\'closeButton\');
objCloseButton.style.filter="progid:DXImageTransform.Microsoft.AlphaImageLoader(src=\'images/close.png\', sizingmethod=scale);"
objCloseButton.style.position = \'absolute\';
objCloseButton.style.zIndex = \'200\';
//objCloseButtonDIV.appendChild(objCloseButton);
//alert(objCloseButton.style.filter);
objLink.appendChild(objCloseButton);

//return false;
}

imgPreloadCloseButton.src = closeButton;

// create image
var objImage = document.createElement("img");
objImage.setAttribute(\'id\',\'lightboxImage\');
objLink.appendChild(objImage);

// create details div, a container for the caption and keyboard message
var objLightboxDetails = document.createElement("div");
objLightboxDetails.setAttribute(\'id\',\'lightboxDetails\');
objLightbox.appendChild(objLightboxDetails);

// create caption
var objCaption = document.createElement("div");
objCaption.setAttribute(\'id\',\'lightboxCaption\');
objCaption.style.display = \'none\';
objLightboxDetails.appendChild(objCaption);

// create keyboard message
var objKeyboardMsg = document.createElement("div");
objKeyboardMsg.setAttribute(\'id\',\'keyboardMsg\');
objKeyboardMsg.innerHTML = \'press <kbd>x</kbd> to close\';
objLightboxDetails.appendChild(objKeyboardMsg);

}

//
// addLoadEvent()
// Adds event to window.onload without overwriting currently assigned onload functions.
// Function found at Simon Willison\'s weblog - http://simon.incutio.com/
//
function addLoadEvent(func)
{
var oldonload = window.onload;
if (typeof window.onload != \'function\'){
window.onload = func;
} else {
window.onload = function(){
oldonload();
func();
}
}

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