提取HTML表单的字段名称-Python [英] Extracting Fields Names of an HTML form - Python
问题描述
假设有一个链接"http://www.someHTMLPageWithTwoForms.com"，它基本上是一个具有两种形式(例如，形式1和形式2)的HTML页面.我有这样的代码...
Assume that there is a link "http://www.someHTMLPageWithTwoForms.com" which is basically a HTML page having two forms (say Form 1 and Form 2). I have a code like this ...
import httplib2
from BeautifulSoup import BeautifulSoup, SoupStrainer
h = httplib2.Http('.cache')
response, content = h.request('http://www.someHTMLPageWithTwoForms.com')
for field in BeautifulSoup(content, parseOnlyThese=SoupStrainer('input')):
if field.has_key('name'):
print field['name']
这将返回属于HTML页面的Form 1和Form 2的所有字段名称.有什么办法可以让我仅获取属于特定表单的字段名称(仅表单2)?
This returns me all the field names that belong both to the Form 1 and Form 2 of my HTML page. Is there any way I can get only the Field names that belong to a particular form (say Form 2 only)?
推荐答案
使用lxml进行这种解析也非常容易(由于其对Xpath的支持，我个人更喜欢BeautifulSoup).例如，以下代码片段将打印属于名为"form2"的表单的所有字段名称(如果有的话):
Doing this kind of parsing would also be quite easy using lxml (which i personally prefer over BeautifulSoup because of its Xpath support). For example, the following snippet would print all fields names (if they have one) which belong to forms named "form2":
# you can ignore this part, it's only here for the demo
from StringIO import StringIO
HTML = StringIO("""
<html>
<body>
<form name="form1" action="/foo">
<input name="uselessInput" type="text" />
</form>
<form name="form2" action="/bar">
<input name="firstInput" type="text" />
<input name="secondInput" type="text" />
</form>
</body>
</html>
""")
# here goes the useful code
import lxml.html
tree = lxml.html.parse(HTML) # you can pass parse() a file-like object or an URL
root = tree.getroot()
for form in root.xpath('//form[@name="form2"]'):
for field in form.getchildren():
if 'name' in field.keys():
print field.get('name')
这篇关于提取HTML表单的字段名称-Python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！
