图像交叉淡入淡出与JavaScript和CSS3过渡 [英] Image Crossfade with Javascript and CSS3 Transitions

问题描述

我试图通过使用CSS3过渡来使幻灯片中的图像交叉淡入淡出。我有幻灯片工作，我知道如何使用过渡，但我不知道如何让CSS和Javascript一起工作来完成这一点。我对JavaScript比较陌生，所以简化的答案非常感谢。

I am trying to get images in a slideshow to crossfade by using CSS3 transitions. I have the slideshow working and I know how to use transitions, but I don't know how to get the CSS and Javascript to work together to accomplish this. I am relatively new to Javascript so simplified answers are greatly appreciated.

Javascript：

Javascript:

var images = new Array()
images[0] = "img/1.jpg";
images[1] = "img/2.jpg";
images[2] = "img/3.jpg";
images[3] = "img/4.jpg";
images[4] = "img/5.jpg";
var timer = setInterval(checkImage, 3000);
var x=0;

function checkImage()
{
    if (x>4)
    {
        x=0;
        changeImage();
    }
    else
    {
        changeImage();
    }
}

function changeImage()
{
document.getElementById("slideimg").src=images[x]
x++;
}

HTML：

<img src="img/5.JPG" width="400" height="300" id="slideimg">

推荐答案

，这里是一个工作演示（需要CSS3转换的浏览器，如Chrome，Safari或Firefox 4+）： http：/ /jsfiddle.net/jfriend00/cwP5Q/ 。

Since you're asking for the whole thing including CSS, here's a working demo (requires CSS3 transition-capable browser such as Chrome, Safari or Firefox 4+): http://jsfiddle.net/jfriend00/cwP5Q/.

HTML：

<div id="container">
<img id="slideimg0" class="slide showMe" src="http://photos.smugmug.com/photos/344287800_YL8Ha-S.jpg">
<img id="slideimg1" class="slide" src="http://photos.smugmug.com/photos/344287888_q22cB-S.jpg">
<img id="slideimg2" class="slide" src="http://photos.smugmug.com/photos/344284440_68L2K-S.jpg">
<img id="slideimg3" class="slide" src="http://photos.smugmug.com/photos/344286315_oyxRy-S.jpg">
<img id="slideimg4" class="slide" src="http://photos.smugmug.com/photos/344285236_hjizX-S.jpg">
</div>

CSS：

#container {position: relative; font-size: 0;}
.slide {
    border: none; 
    opacity: 0; 
    position: absolute; 
    top: 0; 
    left: 0;
    -webkit-transition: opacity 2s linear;
    -moz-transition: opacity 2s linear;
    -o-transition: opacity 2s linear;
    transition: opacity 2s linear;
}
.showMe {opacity: 1;}

JS页面就绪）：

var timer = setInterval(nextImage, 4000);
var curImage = 0;
var numImages = 5;

function nextImage() {
    var e;
    // remove showMe class from current image
    e = document.getElementById("slideimg" + curImage);
    removeClass(e, "showMe");

    // compute next image
    curImage++;
    if (curImage > numImages - 1) {
        curImage = 0;
    }

    // add showMe class to next image
    e = document.getElementById("slideimg" + curImage);
    addClass(e, "showMe");
}

function addClass(elem, name) {
    var c = elem.className;
    if (c) c += " ";  // if not blank, add a space separator
    c += name;
    elem.className = c;
}

function removeClass(elem, name) {
    var c = elem.className;
    elem.className = c.replace(name, "").replace(/   /g, " ").replace(/^ | $/g, "");  // remove name and extra blanks
}

如果你打算这样做，你应该使用一个类库，如jQuery或YUI，这将使动画更容易，在所有浏览器，而不只是CSS3功能的浏览器工作。

If you were going to do this for real, you should use a class library like jQuery or YUI which will make animations both easier and work in all browsers, not just CSS3 capable browsers.

这篇关于图像交叉淡入淡出与JavaScript和CSS3过渡的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！