(Beautiful Soup) 获取按钮标签内的数据

Question

I try to scrape out an ImageId inside a button tag, want to have the result:

"25511e1fd64e99acd991a22d6c2d6b6c".

When I try:

drawing_url = drawing_url.find_all('button', class_='inspectBut')['onclick'] 

it doesn't work. Giving an error-

TypeError: list indices must be integers or slices, not str

Input =

for article in soup.find_all('div', class_='dojoxGridRow'):
drawing_url = article.find('td', class_='dojoxGridCell', idx='3')
drawing_url = drawing_url.find_all('button', class_='inspectBut')
if drawing_url:
    for e in drawing_url:
        print(e)

Output =

    <button class="inspectBut" href="#" 
        onclick="window.open('getImg?imageId=25511e1fd64e99acd991a22d6c2d6b6c&amp;
                 timestamp=1552011572288','_blank', 'toolbar=0, 
                 menubar=0, modal=yes, scrollbars=1, resizable=1, 
                 height='+$(window).height()+', width='+$(window).width())" 
         title="Open Image" type="button">
    </button>
... 
...

Answer 1

You should be searching for

button_list = soup.find_all('button', {'class': 'inspectBut'})

That will give you the button array and you can later get url field by

 [button['getimg?imageid'] for button in button_list]

You will still need to do some parsing, but I hope this can get you on the right track.

Your mistake here was that you need to search correct property class and look for correct html tag, which is, ironically, getimg?imageid .

Answer 2

Try this one.

import re

#for all the buttons
btn_onlclick_list = [a.get('onclick') for a in soup.find_all('button')]
for click in btn_onlclick_list:
     a = re.findall("imageId=(\w+)", click)[0]
     print(a)

Answer 3

You first need to check whether the attribute is present or not. tag.attrs returns a list of attributes present in the current tag

Consider the following Code.

Code:

from bs4 import BeautifulSoup
a="""
<td>
<button class='hi' onclick="This Data">
<button class='hi' onclick="This Second">
</td>"""
soup = BeautifulSoup(a,'lxml')
print([btn['onclick'] for btn in soup.find_all('button',class_='hi') if 'onclick' in btn.attrs])

Output:

['This Data','This Second']

or you can simply do this

[btn['onclick'] for btn in soup.find_all('button', attrs={'class' : 'hi', 'onclick' : True})]