1

嗨，我正在使用此代码从文件夹中获取新图像以填充幻灯片。

在每个循环之后，ajax 应该检查文件夹的内容，看看是否有任何

更改（添加或删除图片）然后在下一个周期它应该对

幻灯片

<html>
<meta http-equiv="refresh" content="1000"/> 
<head>
<title>Slideshow</title>
<style type="text/css">
    #slideshow
    #slideshow img { padding: 15px; border: 1px solid #ccc; background-color: #eee; }
    #slide {width: 370px; height: 220px; padding: 0;  margin:  0 auto; }

    #myslides {
    width: 370px;
    height: 220px;
    padding: 0;  
    margin:  0 auto;  
} 

#myslides img {  
    padding: 10px;  
    border:  1px solid rgb(100,100,100);  
    background-color: rgb(230,230,230);
    width: 350px;
    height: 200px;
    top:  0; 
    left: 0 
}

</style>
</head>
<!-- include jQuery library -->

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.5/jquery.min.js"></script>

<!-- include Cycle plugin -->
<script type="text/javascript" src="http://cloud.github.com/downloads/malsup/cycle/jquery.cycle.all.latest.js"></script>

<script type="text/javascript">
$(document).ready(function(){
$('#slideshow').cycle({
               fx: 'fade',
                speed: 700,
                timeout: 8000
        });
});
</script>

<body>

<div id="slideshow">

</body>



</html>

<script>
    $(function(){
        window.onload("fetchImages()", 2);

        function fetchImages() {
            $.ajax({
                type: "GET",
                url: "load.php"
            }).done(function(response){
                var curImgCount = $('#slideshow img').length;
                if (response.length > curImgCount) {
                    for (var i = curImgCount; i < response.length; i++) {
                        $('#slideshow').append('<img src="images/' + response[i] + '"');    
                    }
                }
            });
        }
    });
</script>

和php的内容：

<?php

    function returnimages($dirname="./images") {
         $pattern="([^\s]+(\.(?i)(jpg|png|gif|bmp))$)";     
         $files = array();
         if($handle = opendir($dirname)) {
            while(false !== ($file = readdir($handle))){
                if(preg_match($pattern, $file)){ //if this file is a valid image 
                    $files[] = $file;
                } 
            }

            closedir($handle);
        }
        //sort($files);         
        natcasesort($files);   

        return($files);
    }

   $images = returnimages();
    foreach($images as $img)
    {
      echo json_encode($images);
    }

   ?>
4

2 回答 2

2

将您的 PHP 更改为：

<?php

function returnimages($dirname="./images") {
  $pattern="([^\s]+(\.(?i)(jpg|png|gif|bmp))$)";
  $files = array();
  if($handle = opendir($dirname)) {
    while(false !== ($file = readdir($handle))){
      if(preg_match($pattern, $file)){ //if this file is a valid image
        $files[] = $file;
      }
    }
    closedir($handle);
  }
  //sort($files);
  natcasesort($files);

  return($files);
}

$images = returnimages();
echo json_encode($images);

?>

和您的 HTML 到：

<html>
  <head>
    <meta http-equiv="refresh" content="1000"/>
    <title>Slideshow</title>
    <style type="text/css">
      #slideshow {
        position: relative;
      }
      #slideshow,
      #slideshow img {
        position: absolute;
        top: 0px;
        left: 0px;
        padding: 15px;
        border: 1px solid #ccc;
        background-color: #eee;
      }
      #slide {
        width: 370px;
        height: 220px;
        padding: 0;
        margin: 0 auto;
      }
      #myslides {
        width: 370px;
        height: 220px;
        padding: 0;
        margin: 0 auto;
      }

      #myslides img {
        padding: 10px;
        border:  1px solid rgb(100,100,100);
        background-color: rgb(230,230,230);
        width: 350px;
        height: 200px;
        top:  0;
        left: 0
      }

    </style>
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.5/jquery.min.js"></script>
    <script type="text/javascript" src="http://cloud.github.com/downloads/malsup/cycle/jquery.cycle.all.latest.js"></script>

    <script type="text/javascript">
      function loadSlides() {
        $.ajax({
          type: "GET",
          url: "load.php"
        }).done(function(response) {
          var temp_images = eval("(" + response + ")");
          for(ti in temp_images)
          {
            //alert(temp_images[ti]);
            $('#slideshow').append('<img src="images/' + temp_images[ti] + '" alt="">');
          }
          startSlideshow();
        });
      }

      function startSlideshow()
      {
        $('#slideshow').cycle({
          fx: 'fade',
          speed: 700,
          timeout: 800
        });
      }

      $(document).ready(function(){
        loadSlides();
      });
    </script>
  </head>
  <body>
    <div id="slideshow" />
  </body>
</html>
于 2012-04-13T16:47:52.747 回答
0

我正在测试这段代码，它工作正常，但为什么刷新元标记？AJAX 的目的不是防止这种情况发生并使其动态化吗？此外，最大的问题是您需要设置一个不太长的元刷新时间，以便图像在添加或删除时不会花费太长时间来反映，并且不会太短以防止某些图像完全显示（不可避免在一点）。

于 2012-08-21T03:40:51.573 回答