Python：从javascript按钮获取下载链接 [英] Python: Get download link from javascript button

问题描述

我正在尝试让我的脚本从www.subscene.com下载字幕。问题是网页上的下载按钮是用java制作的，由于某种原因，即使我提取了URL也无法下载字幕。

I am trying to get my script to download subtitles from www.subscene.com. The problem is that the download button on webpage is made in java, and for some reason i cannot download subtitles even if i extract the URL.

我认为这是代码对于下载按钮：

I think this is the code for the download button:

<a id="s_lc_bcr_downloadLink" class="downloadLink rating0" href="javascript:WebForm_DoPostBackWithOptions(new WebForm_PostBackOptions(&quot;s$lc$bcr$downloadLink&quot;, &quot;&quot;, true, &quot;&quot;, &quot;/english/How-I-Met-Your-Mother-Seventh-Season/subtitle-482407-dlpath-90698/zip.zipx&quot;, false, true))">Download English Subtitle</a><a id="s_lc_bcr_previewLink" href="javascript:togglePreview(482407, 'zip');">(See preview)</a>

所以我提取URL并告诉我的脚本下载它：

so i extract the url and tell my script to download it:

urllib.urlretrieve('http://subscene.com/english/How-I-Met-Your-Mother-Seventh-Season/subtitle-482407-dlpath-90698/zip.zipx','c:\\sub.zip')

添加http://subscene.com）

(Added 'http://subscene.com')

但由于某种原因，它没有下载正确的文件。我应该做什么？

But for some reason it doesnt download the right file. What am i supposed to do?

编辑：

非常感谢！不幸的是，我不能得到它的工作:(它说以下

Thanks a lot! unfortunately i cant get it to work :( it says the following

from selenium import webdriver

browser = webdriver.Firefox()
browser.execute_script('WebForm_DoPostBackWithOptions(newWebForm_PostBackOptions("s$lc$bcr$downloadLink", "", true, "", "/english/How-I-Met-Your-Mother-Seventh-Season/subtitle-482407-dlpath-90698/zip.zipx", false, true))')

Traceback (most recent call last):
File "<pyshell#2>", line 1, in <module>
browser.execute_script('WebForm_DoPostBackWithOptions(new WebForm_PostBackOptions("s$lc$bcr$downloadLink", "", true, "", "/english/How-I-Met-Your-Mother-Seventh-Season/subtitle-482407-dlpath-90698/zip.zipx", false, true))')
File "C:\Users\User\AppData\Roaming\Python\Python27\site-packages\selenium\webdriver\remote\webdriver.py", line 385, in execute_script{'script': script, 'args':converted_args})['value']
File "C:\Users\User\AppData\Roaming\Python\Python27\site-packages\selenium\webdriver\remote\webdriver.py", line 153, in execute
self.error_handler.check_response(response)
File "C:\Users\User\AppData\Roaming\Python\Python27\site-packages\selenium\webdriver\remote\errorhandler.py", line 126, in check_response
raise exception_class(message, screen, stacktrace) 
WebDriverException: Message: ''

推荐答案

正如John所说，这不是文件而是JavaScript代码。所以不用使用urllib.urlretrieve来获得该文件，您可以执行下载文件的JavaScript。这可以使用selenium模块 -

As John said this is not the file but javascript code. So instead of getting that file using urllib.urlretrieve, you can execute the javascript which downloads the files in turn. This can be done using selenium module -

from selenium import webdriver
browser = webdriver.Firefox()
browser.get('http://subscene.com/english/How-I-Met-Your-Mother-Seventh-Season/subtitle-482407.aspx')        
browser.execute_script('WebForm_DoPostBackWithOptions(new WebForm_PostBackOptions("s$lc$bcr$downloadLink", "", true, "", "/english/How-I-Met-Your-Mother-Seventh-Season/subtitle-482407-dlpath-90698/zip.zipx", false, true))')
raw_input()

我得到这个javascript片段使用Firebug 。

I got this javascript snippet using Firebug.

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