Javascript JS和CSS居中幻灯片图像
我有一个幻灯片,它从一个div中提取第一个图像,然后从列表项数组中提取其余的图像。我完全按照Burdette的JavaScript Pocket Guide(2010 printing)中的一个教程进行操作,虽然其他一切都正常,但我无法在第一次操作后获得任何图片,以不同的方式居中或对齐。他们向左漂,漂到了舱顶 HMTL:Javascript JS和CSS居中幻灯片图像,javascript,jquery,html,css,Javascript,Jquery,Html,Css,我有一个幻灯片,它从一个div中提取第一个图像,然后从列表项数组中提取其余的图像。我完全按照Burdette的JavaScript Pocket Guide(2010 printing)中的一个教程进行操作,虽然其他一切都正常,但我无法在第一次操作后获得任何图片,以不同的方式居中或对齐。他们向左漂,漂到了舱顶 HMTL: <!DOCTYPE html> <hmtl class="no-js"> <head> <title>Slidesho
<!DOCTYPE html>
<hmtl class="no-js">
<head>
<title>Slideshow</title>
<link rel="stylesheet" href="slideshow.css" type="text/css" />
<script type="text/javascript">
(function(d, c) { d[c] = d[c].replace(/\bno-js\b/,"js";})(document.documentElement, "className");
</script>
</head>
<body>
<div id="slideshow">
<div class="slides">
<img src="picture01.jpg" width="450" height="336" alt="stuff" />
</div>
<ul>
<li><a href="picture02.jpg" data-size="350x263"</li>
<li><a href="picture03.jpg" data-size="350x263"</li>
<li><a href="picture04.jpg" data-size="350x263"</li>
</ul>
</div>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.1/jquery.min.js" type="text/javascript">
</script>
<script src="slideshow.js" type="text/javascript">
</script>
</body>
</hmtl>
#slideshow {
background-color: #103f1c;
width:500px;
height:450px;
margin-left: auto;
margin-right: auto;
top:0px;
position: relative;
}
#slideshow .slides {
position: relative;
margin-left: auto;
margin-right: auto;
width: 450px;
}
#html.js #slideshow .slides img{
position: absolute;
margin-left: auto;
margin-right: auto;
}
#slideshow .next,
#slideshow .prev {
position: absolute;
top: 50%;
margin-top: -0.5em;
width: 40px;
font-size: 32px;
text-decoration: none;
}
#slideshow .next{
right: -50px;
padding-left:10px;
}
#slideshow .prev {
left:-50px;
padding-right: 10px;
text-align: right;
}
(function($) {
// Include utility jQuery plug-ins
$.fn.tallest = function(outer, margins) {
var fn = outer ? "height" : "outerHeight";
return Math.max.apply(Math, $.map(this, function(el) {
return $(el)[fn](margins);
}));
};
$.fn.widest = function(outer, margins) {
var fn = outer ? "width" : "outerWidth";
return Math.max.apply(Math, $.map(this, function(el) {
return $(el)[fn](margins);
}));
};
// Declare initial variables
var slideshow = $("#slideshow");
var slides = slideshow.find(".slides");
var currentImageIndex = 0;
// Create images from the link list
slideshow.find("ul a").each(function() {
var link = $(this);
var size = link.attr("data-size").split("x");
$("<img />").attr({
src : link.attr("href"),
width : size[0],
height : size[1],
alt : link.text()
}).hide().appendTo(slides);
});
// Collect all images in one node set and hide the list
var images = slides.find("img");
slideshow.find("ul").hide();
// Resize slides <div> to hold the largest images
var slidesWidth = images.widest();
var slidesHeight = images.tallest();
slides.css({
width : slidesWidth,
height : slidesHeight
});
// Center each image
images.each(function() {
var image = $(this);
image.css({
left: slidesHeight / 2 - image.width() / 2,
top: slidesHeight / 2 - image.height() / 2,
});
});
// Save a reference to the first image
var activeImage = images.eq(currentImageIndex);
// The function to show the next or previous image
function showImage(newIndex) {
currentImageIndex = newIndex >= images.length ? 0 : newIndex;
currentImageIndex = currentImageIndex < 0 ? images.length - 1 : currentImageIndex;
activeImage.fadeOut(0);
activeImage = images.eq(currentImageIndex).fadeIn(150);
}
// Start timer to cycle through images
var interval = setInterval(function() {
showImage(currentImageIndex + 1);
}, 5000);
// Create next and previous controls
$('<a href="#" class="next" style="color:white">\u232A</a>').appendTo(slides).bind("click", +1, onClick);
$('<a href="#" class="prev" style="color:white">\u2329</a>').appendTo(slides).bind("click", -1, onClick);
// The event handler for the controls
function onClick(event) {
event.preventDefault();
clearInterval(interval);
showImage(currentImageIndex + event.data);
}
})(jQuery); // Self-invoking function executes automatically
JS:
<!DOCTYPE html>
<hmtl class="no-js">
<head>
<title>Slideshow</title>
<link rel="stylesheet" href="slideshow.css" type="text/css" />
<script type="text/javascript">
(function(d, c) { d[c] = d[c].replace(/\bno-js\b/,"js";})(document.documentElement, "className");
</script>
</head>
<body>
<div id="slideshow">
<div class="slides">
<img src="picture01.jpg" width="450" height="336" alt="stuff" />
</div>
<ul>
<li><a href="picture02.jpg" data-size="350x263"</li>
<li><a href="picture03.jpg" data-size="350x263"</li>
<li><a href="picture04.jpg" data-size="350x263"</li>
</ul>
</div>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.1/jquery.min.js" type="text/javascript">
</script>
<script src="slideshow.js" type="text/javascript">
</script>
</body>
</hmtl>
#slideshow {
background-color: #103f1c;
width:500px;
height:450px;
margin-left: auto;
margin-right: auto;
top:0px;
position: relative;
}
#slideshow .slides {
position: relative;
margin-left: auto;
margin-right: auto;
width: 450px;
}
#html.js #slideshow .slides img{
position: absolute;
margin-left: auto;
margin-right: auto;
}
#slideshow .next,
#slideshow .prev {
position: absolute;
top: 50%;
margin-top: -0.5em;
width: 40px;
font-size: 32px;
text-decoration: none;
}
#slideshow .next{
right: -50px;
padding-left:10px;
}
#slideshow .prev {
left:-50px;
padding-right: 10px;
text-align: right;
}
(function($) {
// Include utility jQuery plug-ins
$.fn.tallest = function(outer, margins) {
var fn = outer ? "height" : "outerHeight";
return Math.max.apply(Math, $.map(this, function(el) {
return $(el)[fn](margins);
}));
};
$.fn.widest = function(outer, margins) {
var fn = outer ? "width" : "outerWidth";
return Math.max.apply(Math, $.map(this, function(el) {
return $(el)[fn](margins);
}));
};
// Declare initial variables
var slideshow = $("#slideshow");
var slides = slideshow.find(".slides");
var currentImageIndex = 0;
// Create images from the link list
slideshow.find("ul a").each(function() {
var link = $(this);
var size = link.attr("data-size").split("x");
$("<img />").attr({
src : link.attr("href"),
width : size[0],
height : size[1],
alt : link.text()
}).hide().appendTo(slides);
});
// Collect all images in one node set and hide the list
var images = slides.find("img");
slideshow.find("ul").hide();
// Resize slides <div> to hold the largest images
var slidesWidth = images.widest();
var slidesHeight = images.tallest();
slides.css({
width : slidesWidth,
height : slidesHeight
});
// Center each image
images.each(function() {
var image = $(this);
image.css({
left: slidesHeight / 2 - image.width() / 2,
top: slidesHeight / 2 - image.height() / 2,
});
});
// Save a reference to the first image
var activeImage = images.eq(currentImageIndex);
// The function to show the next or previous image
function showImage(newIndex) {
currentImageIndex = newIndex >= images.length ? 0 : newIndex;
currentImageIndex = currentImageIndex < 0 ? images.length - 1 : currentImageIndex;
activeImage.fadeOut(0);
activeImage = images.eq(currentImageIndex).fadeIn(150);
}
// Start timer to cycle through images
var interval = setInterval(function() {
showImage(currentImageIndex + 1);
}, 5000);
// Create next and previous controls
$('<a href="#" class="next" style="color:white">\u232A</a>').appendTo(slides).bind("click", +1, onClick);
$('<a href="#" class="prev" style="color:white">\u2329</a>').appendTo(slides).bind("click", -1, onClick);
// The event handler for the controls
function onClick(event) {
event.preventDefault();
clearInterval(interval);
showImage(currentImageIndex + event.data);
}
})(jQuery); // Self-invoking function executes automatically
(函数($){
//包含实用工具jQuery插件
$.fn.1=函数(外部,边距){
var fn=外部?“高度”:“外部高度”;
返回Math.max.apply(Math,$.map)(此函数为el){
返回美元(el)[fn](保证金);
}));
};
$.fn.widest=函数(外部,边距){
var fn=外部?“宽度”:“外部宽度”;
返回Math.max.apply(Math,$.map)(此函数为el){
返回美元(el)[fn](保证金);
}));
};
//声明初始变量
var slideshow=$(“#slideshow”);
var slides=slideshow.find(“.slides”);
var currentImageIndex=0;
//从链接列表创建图像
slideshow.find(“ula”).each(函数(){
var-link=$(这个);
变量大小=link.attr(“数据大小”).split(“x”);
$()以保存最大的图像
var slidesWidth=images.widtest();
var slidesHeight=images.highter();
slides.css({
宽度:滑块宽度,
高度:幻灯片高度
});
//将每个图像居中
images.each(函数(){
var image=$(这是);
image.css({
左:幻灯片权重/2-image.width()/2,
顶部:幻灯片权重/2-image.height()/2,
});
});
//保存对第一个图像的引用
var activeImage=images.eq(currentImageIndex);
//显示下一个或上一个图像的功能
函数showImage(newIndex){
currentImageIndex=newIndex>=images.length?0:newIndex;
currentImageIndex=currentImageIndex<0?images.length-1:currentImageIndex;
动态图像淡出(0);
activeImage=images.eq(currentImageIndex).fadeIn(150);
}
//启动计时器以循环浏览图像
var interval=setInterval(函数(){
showImage(currentImageIndex+1);
}, 5000);
//创建下一个和上一个控件
$(“”).appendTo(幻灯片).bind(“单击“,+1,onClick”);
$(“”).appendTo(幻灯片).bind(“单击”、-1、onClick);
//控件的事件处理程序
函数onClick(事件){
event.preventDefault();
间隔时间;
showImage(currentImageIndex+事件数据);
}
})(jQuery);//自动执行自调用函数
这里的主要问题在于CSS:
#html.js #slideshow .slides img{
position: absolute;
margin-left: auto;
margin-right: auto;
}
页边距:自动;仅适用于具有定义宽度的对象。由于图像是替换的内联块,因此不存在实际宽度。更糟糕的是,您完全定位了图像,这改变了页边距的工作方式-项目将始终拾取其相对于已确定父项的位置,并在在流量之外,所以自动将不相关
第一步是删除图像上的绝对位置,这在这里没有用处
默认情况下,图像是一种内联块,因此只需在“#slideshow.slides”选择器中添加“text align:center;”即可使图像居中
或者,如果我们只想编辑图像并强制它们自身居中,请将上面的块更改为:
#html.js #slideshow .slides img{
display:block;
margin-left: auto;
margin-right: auto;
}
所有的东西都应该按你想要的那样排列。为什么要添加这段代码
images.each(function(){var image=$(this);image.css({左:slidesHeight/2-image.width()/2,上:slidesHeight/2-image.height()/2,});})
?从css#html.js#幻灯片中。幻灯片img
删除位置:绝对。这样,您就不需要在javascript中指定顶部和左侧属性。您发布了大量代码。请添加一个jsfiddle或类似内容将文本对齐:居中;
添加到幻灯片中。幻灯片效果良好很好,谢谢!