[英]Javascript image slider issue
我使用了以下幻燈片代碼,可在此論壇頁面上找到
這是代碼:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<TITLE>New Restaurant - Crete</TITLE>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta http-equiv="Imagetoolbar" content="no">
<link rel="shortcut icon" href="favicon.ico">
<script type="text/javascript" language="JavaScript1.2">
//Background Image Slideshow- © Dynamic Drive (www.dynamicdrive.com)
//For full source code, 100's more DHTML scripts, and TOS,
//visit http://www.dynamicdrive.com
//Specify background images to slide
var bgslides=new Array()
bgslides[0]="http://www.google.com/img1.jpg"
bgslides[1]="http://www.google.com/img2.jpg"
bgslides[2]="http://www.google.com/img3.jpg"
bgslides[3]="http://www.google.com/img4.jpg"
bgslides[4]="http://www.google.com/img5.jpg"
bgslides[5]="http://www.google.com/img6.jpg"
//preload images
var processed=new Array()
for (i=0;i<bgslides.length;i++){
processed[i]=new Image()
processed[i].src=bgslides[i]
}
</script>
<style type="text/css">
<!--
html, body, #wrapper {
height:100%;
margin: 0;
padding: 0;
border: none;
text-align: center;
overflow:hidden;
}
#wrapper {
margin: 0 auto;
text-align: center;
vertical-align: top;
width: 550px;
}
.image {
position:relative;
float:left; /* optional */
}
.image .text {
position:absolute;
top:30px; /* in conjunction with left property, decides the text position */
left:0;
width:550px; /* optional, though better have one */
}
p {
font-family:Trajan Pro, serif;
font-size:medium;
font-weight:bold;
color:white;
}
h1 {
font-family:Trajan Pro, serif;
font-weight:bold;
font-size:x-large;
color:white;
text-align:center;
}
body {
background-attachment:fixed;
background-repeat: no-repeat;
/*Use center center in place of 300 200 to center bg image*/
background-position: center;
}
#bg {
position:absolute;z-Index:0;left:0px;top:0px;
}
#bg IMG{
position:absolute;left:0px;top:0px;
}
-->
</style>
</head>
<body>
<div id="bg" >
<img src="http://www.google.com/img1.jpg">
<img src="http://www.google.com/img2.jpg">
<img src="http://www.google.com/img3.jpg">
<img src="http://www.google.com/img4.jpg">
<img src="http://www.google.com/img5.jpg">
<img src="http://www.google.com/img6.jpg">
</div>
<script type="text/javascript">
// Animate (11-January-2010)
// by Vic Phillips http://www.vicsjavascripts.org.uk
// To progressively change the Left, Top, Width, Height or Opacity of an element over a specified period of time.
// With the ability to scale the effect time on specified minimum/maximum values
// and with three types of progression 'sin' and 'cos' and liner.
// **** Application Notes
// **** The HTML Code
//
// when moving an element the inline or class rule style position of the element should be assigned as
// 'position:relative;' or 'position:absolute;'
//
// The element would normally be assigned a unique ID name.
//
// **** Initialising the Script.
//
// The script is initialised by assigning an instance of the script to a variable.
// e.g A = new zxcAnimate('left','id1')
// where:
// A = a global variable (variable)
// parameter 0 = the mode(see Note 1). (string)
// parameter 1 = the unique ID name or element object. (string or element object)
// parameter 1 = the initial value. (digits, default = 0)
// **** Executing the Effect
//
// The effect is executed by an event call to function 'A.animate(10,800 ,5000,[10,800]);'
// where:
// A = the global referencing the script instance. (variable)
// parameter 0 = the start value. (digits, for opacity minimum 0, maximum 100)
// parameter 1 = the finish value. (digits, for opacity minimum 0, maximum 100)
// parameter 2 = period of time between the start and finish of the effect in milliseconds. (digits or defaults to previous or 0(on first call) milliSeconds)
// parameter 3 = (optional) to scale the effect time on a specified minimum/maximum. (array, see Note 3)
// field 0 the minimum value. (digits)
// field 1 the maximum value. (digits)
// parameter 3 = (optional) the type of progression, 'sin', 'cos' or 'liner'. (string, default = 'liner')
// 'sin' progression starts fast and ends slow.
// 'cos' progression starts slow and ends fast.
//
// Note 1: Examples modes: 'left', 'top', 'width', 'height', 'opacity.
// Note 2: The default units(excepting opacity) are 'px'.
// For hyphenated modes, the first character after the hyphen must be upper case, all others lower case.
// Note 3: The scale is of particular use when re-calling the effect
// in mid progression to retain an constant rate of progression.
// Note 4: The current effect value is recorded in A.data[0].
// Note 5: A function may be called on completion of the effect by assigning the function
// to the animator intance property .Complete.
// e.g. [instance].Complete=function(){ alert(this.data[0]); };
//
// **** Functional Code(1.58K) - NO NEED to Change
function zxcAnimate(mde,obj,srt){
this.to=null;
this.obj=typeof(obj)=='object'?obj:document.getElementById(obj);
this.mde=mde.replace(/\W/g,'');
this.data=[srt||0];
return this;
}
zxcAnimate.prototype.animate=function(srt,fin,ms,scale,c){
clearTimeout(this.to);
this.time=ms||this.time||0;
this.neg=srt<0||fin<0;
this.data=[srt,srt,fin];
this.mS=this.time*(!scale?1:Math.abs((fin-srt)/(scale[1]-scale[0])));
this.c=typeof(c)=='string'?c.charAt(0).toLowerCase():this.c?this.c:'';
this.inc=Math.PI/(2*this.mS);
this.srttime=new Date().getTime();
this.cng();
}
zxcAnimate.prototype.cng=function(){
var oop=this,ms=new Date().getTime()-this.srttime;
this.data[0]=(this.c=='s')?(this.data[2]-this.data[1])*Math.sin(this.inc*ms)+this.data[1]:(this.c=='c')?this.data[2]-(this.data[2]-this.data[1])*Math.cos(this.inc*ms):(this.data[2]-this.data[1])/this.mS*ms+this.data[1];
this.apply();
if (ms<this.mS) this.to=setTimeout(function(){oop.cng()},10);
else {
this.data[0]=this.data[2];
this.apply();
if (this.Complete) this.Complete(this);
}
}
zxcAnimate.prototype.apply=function(){
if (isFinite(this.data[0])){
if (this.data[0]<0&&!this.neg) this.data[0]=0;
if (this.mde!='opacity') this.obj.style[this.mde]=Math.floor(this.data[0])+'px';
else zxcOpacity(this.obj,this.data[0]);
}
}
function zxcOpacity(obj,opc){
if (opc<0||opc>100) return;
obj.style.filter='alpha(opacity='+opc+')';
obj.style.opacity=obj.style.MozOpacity=obj.style.KhtmlOpacity=opc/100-.001;
}
</script>
<script type="text/javascript">
<!--
function BGFade(o){
var p=document.getElementById(o.ID)
if (p){
var bgs=p.getElementsByTagName('IMG');
this.bgs=[];
for (var z0=0;z0<bgs.length;z0++){
this.bgs[z0]=new zxcAnimate('opacity',bgs[z0]);
}
this.nu=z0-1;
this.ms=o.Duration||1000;
this.hold=o.Hold||this.ms*2;
if(this.nu>0){
this.Rotate();
}
}
}
BGFade.prototype.Rotate=function(){
this.bgs[this.nu].obj.style.zIndex='0';
this.bgs[this.nu].animate(100,0,this.ms);
this.nu=++this.nu%this.bgs.length;
this.bgs[this.nu].obj.style.zIndex='1';
this.bgs[this.nu].obj.style.left=-(this.bgs[this.nu].obj.width-zxcWWHS()[0])/2+'px'; // horizontal center
this.bgs[this.nu].obj.style.top=-(this.bgs[this.nu].obj.height-zxcWWHS()[1])/2+'px'; // vertical center
this.bgs[this.nu].animate(0,100,this.ms);
var oop=this;
this.to=setTimeout(function(){ oop.Rotate(); },this.hold);
}
function zxcByClassName(nme,el,tag){
if (typeof(el)=='string') el=document.getElementById(el);
el=el||document;
for (var tag=tag||'*',reg=new RegExp('\\b'+nme+'\\b'),els=el.getElementsByTagName(tag),ary=[],z0=0; z0<els.length;z0++){
if(reg.test(els[z0].className)) ary.push(els[z0]);
}
return ary;
}
function zxcWWHS(){
if (window.innerHeight) return [window.innerWidth-10,window.innerHeight-10,window.pageXOffset,window.pageYOffset];
else if (document.documentElement.clientHeight) return [document.documentElement.clientWidth-10,document.documentElement.clientHeight-10,document.documentElement.scrollLeft,document.documentElement.scrollTop];
return [document.body.clientWidth,document.body.clientHeight,document.body.scrollLeft,document.body.scrollTop];
}
new BGFade({
ID:'bg', // the unique id name of the container div. (string)
Duration:1000, // the duration of the fade effect in milli seconds. (digits)
Hold:2000 // the duration of the change between images in milli seconds. (digits)
});
//-->
</script>
</body>
</html>
我對此有疑問,這是一個奇怪的錯誤。 如果您有3張以上的圖像(4張或更多圖像),則發生的是與其淡入下一張圖像,而不是淡入下一張圖像。 如果只有三個圖像,則效果很好。 但是我需要6張圖片。
例如,如果我有6張圖片,則:
圖片#1出現,
然后圖像#1淡入圖像#5,然后出現圖像#2,
然后圖像#2淡入圖像#5,然后出現圖像#3,
然后圖像#3淡入圖像#5,然后出現圖像#4,
然后圖像#4淡入圖像#5,然后出現圖像#5,
然后圖像#5淡入圖像#6,然后出現圖像#6,
然后圖像#6淡入圖像#1,然后出現圖像#1
如您所見,當到達倒數第二個圖像時,它開始正常工作。 但是,如果您重新加載頁面,則該循環將再次從這個怪異的錯誤開始。
但是應該發生的是:
圖片#1出現,
然后圖像#1淡入圖像#2,
然后圖像#2淡入圖像#3,
然后圖像#3淡入圖像#4,
然后圖像#4淡入圖像#5,
然后圖像#5淡入圖像#6,
然后圖像#6淡入圖像#1
您能告訴我如何解決此問題,以便淡入淡出正確顯示超過3張圖像嗎?
注意: 圖像太大不是問題。 如果是1px x 1px的圖片,也會發生相同的情況。
(注意:演示圖像不再存在)
好,所以我正在進步-
似乎出現“倒數第二個”的原因似乎是因為顯然所有圖像都顯示在重復的框中; 只是,它們隨着數量的增加而消失。 除最后一張圖像外,所有圖像的不透明度都設置為1,最后一張圖像的不透明度設置為-0.001,這使其不可見,因此為什么您看到倒數第二個而不是最后一個。
但是應該發生的是所有,但是應該給第一個不透明度-0.001,直到它們的數目出現為止。 (當它們的編號出現時,由於某種原因,它們的重復項會消失,而javascript會用不透明度手動覆蓋HTML元素的頁面CSS。)
解決了!!!! 好極了!!!!
確定,因此您需要添加以下CSS:
#bg img {
opacity: -0.001;
}
僅需注意,您需要使用!important強制圖像位置。 例如,bg的div ID的完整CSS為:
#bg {
position: absolute;
z-Index:0;
}
#bg img {
position: absolute;
top: 50px !important;
left: 50px !important;
opacity: -0.001;
}
解決了!!!! 好極了!!!!
確定,因此您需要添加以下CSS:
#bg img {
opacity: -0.001;
}
僅需注意,您需要使用!important強制圖像位置。 例如,bg的div ID的完整CSS為:
#bg {
position: absolute;
z-Index:0;
}
#bg img {
position: absolute;
top: 50px !important;
left: 50px !important;
opacity: -0.001;
}
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