如何创建不需要右键单击的 PDF 下载链接? [英] How can I create a download link of a PDF that does not require a right click?

问题描述

我在一个网站上工作，访问者应该可以在其中下载 pdf 文件.(有三个链接可供选择，但这无关紧要)我想知道如何制作它以便访问者只需单击链接而不必

I am working on a website where the visitor should be able to download a pdf file. (There are three links to choose from but that is irrelevant) I wanted to know how to make it so that the visitor can simply click the link and not have to

right click > Save (target) As...

我对 PHP 和/或 Javascript 解决方案持开放态度.谢谢.

I am open to PHP and or Javascript solutions. Thanks.

我可以使用 javascript 调用 PHP 并通过 AJAX 保存文件吗?

Can I use javascript to call the PHP and save the file via AJAX?

我最后使用了 Nirmal 的解决方案，因为它是对所有三个文件进行更改最简单的方法.我不需要为三个 PDF 制作 3 个文件，也不需要手动编码开关.BalusC 得到了检查，因为他/她的代码首先启动并且也能做到这一点.

I used Nirmal's solution in the end, since it was the simplest to change for all three files. I didn't need to make 3 files for the three PDF's and I didn't need to hand code the switch. BalusC gets the check though since his/her code was up first and does the trick too.

推荐答案

您基本上需要做的就是设置 Content-Disposition 标题到 attachment 以获得另存为"对话框.这是一个启动 PHP 示例:

All you basically need to do is to set the Content-Disposition header to attachment to get a 'Save As' dialogue. Here's a kickoff PHP example:

<?php
    header('Content-Type: application/pdf');
    header('Content-Disposition: attachment;filename="foo.pdf"');
    readfile('/path/to/foo.pdf');
?>

您不能也不想用 Javascript 来做到这一点.

You can't and don't want to do this with Javascript.

重要提示:由于一个糟糕的功能，在 MSIE 中，另存为"对话框中的默认文件名不会从 content-disposition 标头中派生，而是作为最后一部分请求 URL 中的路径信息.要解决此问题，请将 PDF 文件名附加到链接，例如http://example.com/pdf/foo.pdf.您甚至可以在 PHP 中使用它来读取 pathinfo 中指定的 PDF 文件.下面是 pdf.php 的一个基本示例:

Important note: due to a poor feature, in MSIE the default filename in 'Save As' dialogue won't be derived from the content-disposition header, it will instead be the last part of the pathinfo in the request URL. To workaround this, append the PDF filename to the link, e.g. http://example.com/pdf/foo.pdf. You can even make use of it in PHP to read the in the pathinfo specified PDF file. Here's a basic example of pdf.php:

<?php
    $file_name = $_SERVER['PATH_INFO'];
    $file = '/path/to/pdf/files' . $file_name;
    if (file_exists($file)) {
        header('Content-Type: application/pdf');
        header('Content-Disposition: attachment;filename="' . basename($file_name) . '"');
        header('Content-Length: ' . filesize($file));
        readfile($file);
    } else {
        header('HTTP/1.1 404 Not Found');
    }
?>

然而，这假设您已经打开了 MultiViews，以便 /pdf/ 将通过这个 PHP 文件，或者至少一个 RewriteRule从 /pdf/ 到 /pdf.php/.

This however assumes that you've MultiViews on so that /pdf/ will go through this PHP file, or at least a RewriteRule from /pdf/ to /pdf.php/.

这种方法的主要优点是，当您想要添加新的 PDF 文件或更改 PDF 文件名时，您无需更改代码.

The major advantage of this approach is that you don't need to change the code whenever you want to add a new PDF file or change the PDF file name.

您甚至可以通过自动确定和设置正确的内容类型来使其更通用:

You can even make it more generic by automatically determining and setting the correct content type:

<?php
    $file_name = $_SERVER['PATH_INFO'];
    $file = '/path/to/all/files' . $file_name;
    if (file_exists($file)) {
        header('Content-Type: ' . mime_content_type($file_name));
        header('Content-Disposition: attachment;filename="' . basename($file_name) . '"');
        header('Content-Length: ' . filesize($file));
        readfile($file);
    } else {
        header('HTTP/1.1 404 Not Found');
    }
?>

将它命名为 files.php 左右，然后你就有了一个通用的 PHP 下载器，你可以通过例如 http://example.com/files/foo.pdf、<代码>http://example.com/files/bar.zip 等.

Name it files.php or so and then you have a generic PHP downloader which you can access by for example http://example.com/files/foo.pdf, http://example.com/files/bar.zip, etcetera.

希望这会有所帮助.

这篇关于如何创建不需要右键单击的 PDF 下载链接?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！