超链接工作 - 带提交按钮的Html表单不工作

问题描述：

I have a PHP script that pushes the headers to allow a file to download. This script works fine when it called via a hyperlink or through the browser using link. This is how it looks like:

<a href="download.php?file=test.mp3&properFilename=Testing File">Download</a>

I want this to be a button (sbumit) instead, so I did this:

<form action="download.php?file=test.mp3&properFilename=Testing File" method="get">
<input type="submit" value="Download Audio" name="download"/>
</form>

However, this doesn't work. When I click on it. It initiates the download dialog box but the filename is empty. It shows file name as ".mp3" (without quotes)! That same link via the hyperlink shows the exact file name "Testing File". Why is this?? Here is the PHP snippet concerned:

$filename = '../'.$_GET['file'];
$properFilename = $_GET['properFilename'].'.mp3';

header("Content-Disposition: attachment; filename=\"".basename($properFilename)."\";" );
header("Content-Transfer-Encoding: binary");
header("Content-Length: ".filesize($filename));
readfile("$filename");
exit();

Thank you for any help. This has been driving me mad all day and night!!!

我有一个PHP脚本，可以推送标题以允许下载文件。当通过超链接或通过浏览器使用链接调用时，此脚本可以正常工作。这是它的样子： p>

 ＆lt; a href =“download.php？file = test.mp3＆amp; properFilename = Testing File”＆gt;下载＆lt; / a＆gt; \  n  code>  pre> 
 
 我希望这是一个按钮（sbumit），所以我这样做了： p> 
 
 
 ＆lt; form  action =“download.php？file = test.mp3＆amp; properFilename = Testing File”method =“get”＆gt; 
＆lt; input type =“submit”value =“Download Audio”name =“download”/＆gt; 
＆lt  ; / form＆gt; 
  code>  pre> 
 
 但是，这不起作用。 当我点击它。 它启动下载对话框但文件名为空。 它将文件名显示为“.mp3”（不带引号）！ 通过超链接的相同链接显示确切的文件名“测试文件”。 为什么是这样？？ 以下是相关的PHP代码段： p> 
 
 
  $ filename ='../'.$_GET ['file']; 
nnproperFilename = $ _GET ['properFilename']  。'。mp3'; 
 
header（“Content-Disposition：attachment; filename = \”“。basename（$ properFilename）。”\“;”）; 
header（“Content-Transfer-Encoding：binary”）  ; 
header（“Content-Length：”。filesize（$ filename））; 
readfile（“$ filename”）; 
exit（）;  
  code>  pre> 
 
  感谢您的帮助 strong>。 这让我一整天都疯了!!!  p> 
  div>

答

I think that the action url it's been urlencoded, and the hard-coded GET parameters are not sent.

You can try to set the action url simply to download.php and have two hidden fields containing the "file" and "properFilename" parameters, like this:

<form action="download.php" method="GET">
  <input type="submit" value="Download Audio" name="download"/>
  <input type="hidden" name="file" value="test.mp3" />
  <input type="hidden" name="properFilename" value="Testing File" />
</form>

Or you can use a input type="button", even without the form:

<input type="button" 
      onclick="location.href='download.php?file=test.mp3&properFilename=Testing File';" 
      value="Download"/>

Or an image button:

<a href="download.php?file=test.mp3&properFilename=Testing File">
   <img src="IMAGE_BUTTON_HERE" />
</a>

答

Instead of using <input type='button'> as CMS suggests, you can also use the button element (which is actually the semantic correct one here since your not in a form)

<button onclick="document.location = 'bla.php?f=vars'">Download</button>

Even better would be off course be to move the onclick event out of the button into a seperate javascript file.

超链接工作 - 带提交按钮的Html表单不工作

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