现有 JavaScript 照片库的图像淡入淡出效果

Image fade effect for an existing javascript photo gallery

本文关键字：淡出 淡入 图像 JavaScript 照片库 现有      更新时间：2023-09-26

我是一名摄影师，最近一直在重新设计我的网站。我利用了一个非常有用的网站上找到的幻灯片代码，并且能够通过删除自动播放、自定义下一个、上一个按钮等来根据我的需要对其进行自定义......这真的很简单，现在似乎运行良好。

但我有一个问题。是否可以在不完全重写代码的情况下为图像过渡添加淡入淡出效果？几天来我一直在寻找javascript/jquery代码，我遇到了许多提供代码的网站，但我找不到任何可以让我将其实现到现有库中的网站。这是我的代码的样子;

<body>
<!-- configurable script -->
<script type="text/javascript">
theimage = new Array();

// The dimensions of ALL the images should be the same or some of them may look stretched or reduced in Netscape 4.
// Format: theimage[...]=[image URL, link URL, name/description]
theimage[0]=["/images/portrait/image1.jpg", "", "Image Title 1"];
theimage[1]=["/images/portrait/image2.jpg", "", "Image Title 2"];
theimage[2]=["/images/portrait/image3.jpg", "", "Image Title 3"];
theimage[3]=["/images/portrait/image4.jpg", "", "Image Title 4"];
theimage[4]=["/images/portrait/image5.jpg", "", "Image Title 5"];
theimage[5]=["/images/portrait/image6.jpg", "", "Image Title 6"];
theimage[6]=["/images/portrait/image7.jpg", "", "Image Title 7"];
theimage[7]=["/images/portrait/image8.jpg", "", "Image Title 8"];
///// Plugin variables
playspeed=0;// The playspeed determines the delay for the "Play" button in ms
//#####
//key that holds where in the array currently are
i=0;

//###########################################
window.onload=function(){
    //preload images into browser
    preloadSlide();
    //set the first slide
    SetSlide(0);
}
//###########################################
function SetSlide(num) {
    //too big
    i=num%theimage.length;
    //too small
    if(i<0)i=theimage.length-1;
    //switch the image
    document.images.imgslide.src=theimage[i][0];
    //if they want name of current slide
    document.getElementById('slidebox').innerHTML=theimage[i][2];
    //if they want current slide number and total
    document.getElementById('slidecount').innerHTML= ""+(i+1)+" / "+theimage.length;
}
//###########################################
function preloadSlide() {
    for(k=0;k<theimage.length;k++) {
        theimage[k][0]=new Image().src=theimage[k][0];
    }
}
</script>

<!-- slide show HTML -->
<form name="slideshow">
<table border="0" cellpadding="2" cellspacing="0">
<tr>
    <td align="left">
    <script type="text/javascript">
        document.write('<img name="imgslide" id="imgslide" src="'+theimage[0][0]+'" border="0">')
    </script>
    </td>
</tr>
<tr>
    <td align="left"><div id="slidebox"></div></td>
</tr>
<tr>
    <td height="30px" align="left" valign="bottom">
        <a style="text-decoration:none;" href="javascript:SetSlide(i-1);" onfocus="this.blur()">Prev</a> | 
        <a style="text-decoration:none;" margin-left:2px"; href="javascript:SetSlide(i+1);" onfocus="this.blur()">Next</a>
        <div style="display:inline; margin-left:10px" align="left" id="slidecount"></div>
    </td>
</tr>
</table>
</form>
<!-- end of slide show HTML -->
</body>

谢谢！

你可以更改SetSlide()来实现一个fadeOut，然后使用jQuery实现一个fadeIn，如下所示：

//###########################################
function SetSlide(num, titleOnly) {
    if (!titleOnly) {
        //switch the image
        var img = $("#imgslide");
        // don't interrupt an image in transition
        if (img.data("inTransition")) {
            return;
        }
        img.data("inTransition", true);

        //too big
        i=num%theimage.length;
        //too small
        if(i<0)i=theimage.length-1;
        img.stop(true).animate({opacity: 0}, 1000, function() {
            img.attr("src", theimage[i][0]);
            img.animate({opacity: 1}, 1000, function() {
                img.data("inTransition", false);
            });
        })
    }
    //if they want name of current slide
    document.getElementById('slidebox').innerHTML=theimage[i][2];
    //if they want current slide number and total
    document.getElementById('slidecount').innerHTML= ""+(i+1)+" / "+theimage.length;
}

并将preloadSlide()更改为：

//###########################################
function preloadSlide() {
    for(k=0;k<theimage.length;k++) {
        theimage[k][3]=new Image().src=theimage[k][0];
    }
}

这是一个工作演示：http://jsfiddle.net/jfriend00/85nzq/

要在页面中包含 jQuery，请在其他脚本之前的 <body> 标记之后的右上角添加以下内容：

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
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