javascript 如何使用 jQuery 计算目录中的文件？
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How do I count files in a directory using jQuery?
提问by bdrelling
I'd like to count the number of files in a folder and return that number to set a variable in a .js file.
我想计算文件夹中的文件数并返回该数字以在 .js 文件中设置变量。
Essentially, I have X number of images in a folder. When the user clicks the right arrow, I replace the existing set of 8 images with the next set of 8 images, and so on and so forth. I currently manually enter the variable (38 right now) into the page, since there are 38 thumbnails in the folder.
本质上，我在一个文件夹中有 X 个图像。当用户单击右箭头时，我用下一组 8 张图像替换现有的一组 8 张图像，依此类推。我目前在页面中手动输入变量（现在是 38 个），因为文件夹中有 38 个缩略图。
The code works perfectly, but I hate the idea of changing a number each time I add a file. I'd like to have it set the variable to the exact number of images in the folder.
该代码运行良好，但我讨厌每次添加文件时更改数字的想法。我想让它将该变量设置为文件夹中图像的确切数量。
Is this possible using JavaScript or jQuery? Do I need to write a PHP file to do return this variable for me? Any information would be great!
这可以使用 JavaScript 或 jQuery 吗？我是否需要编写一个 PHP 文件来为我返回这个变量？任何信息都会很棒！
回答by Mendhak
This is the kind of task PHP is better suited for, keep your Javascript to the client-side. Write a very simple PHP script that counts the files in a folder
这是 PHP 更适合的任务，将您的 Javascript 保留在客户端。编写一个非常简单的 PHP 脚本来计算文件夹中的文件数
echo iterator_count(new DirectoryIterator('/home/path/dir'));
And call it from your JQuery script.
并从您的 JQuery 脚本中调用它。
$.get('numberoffiles.php', function(data) {
alert(data);
});
回答by mplungjan
If you must use client side and the files are numbered, preload the file and set the number when you get an error
如果必须使用客户端并且文件已编号，请预加载文件并在出现错误时设置编号
...
Img = new Image();
Img.onerror=function() {
maxImages=cnt-1;
}
Img.src = "image_"+cnt+".jpg";
回答by Oscar Jara
Simple way:
简单的方法：
<?php
$dir = "images";
$file_count = count(glob("{$dir}/*.*"));
?>
<html>
<head>
<title>Welcome</title>
</head>
<script type="text/javascript" src="http://code.jquery.com/jquery-1.7.2.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
var dir = <?php echo $dir ?>;
var file_count = <?php echo $file_count ?>;
$('#msg').html('File count in folder ' + dir + ' is ' + file_count);
});
</script>
<body>
<div id="msg"></div>
</body>
</html>
回答by Adam F
I would do it like this
我会这样做
echo count(glob("{$_GET['dir']}/*.*"));
