How to add javascript to html using beautiful soup?

Question

I'm using beautiful soup to edit an html file. I've been able to add a tag, but I'm having trouble adding my javascript code inside the script element.

I have the following code:

soup = BeautifulSoup(differencehtml, 'html.parser')

# create a new tag
tag = soup.new_tag("script")
tag.append = jscodestring  # this is not adding the javascript to the html file
# tag.string = jscodestring # also tried this unsuccesfully

head = soup.find('head')

#insert new tag after head tag
head.insert_after(tag)

When I inspect the resulting html, it looks like this:

...
</head>
<script>
   </script>
...

Why does append not work? How do I get code inside the script tag?

See one of the answers in this SO question.

Jeroen Heier
– Jeroen Heier

2018-08-29 19:00:16 +00:00
Commented Aug 29, 2018 at 19:00 — Jeroen Heier
– Jeroen Heier, Commented Aug 29, 2018 at 19:00

UCProgrammer · Accepted Answer · 2018-08-29 20:22:02Z

1

Append() is used to modify the tags's contents. Look at the documentation here, https://www.crummy.com/software/BeautifulSoup/bs4/doc/#navigablestring-and-new-tag .

This line of your code :

tag.append = jscodestring  # this is not adding the javascript to the html file

would need to look like this

tag.append(jscodestring)  # this is not adding the javascript to the html file

Even so, doing this would just place a string value of whatever jscodestring equals inside your tag's contents.

What you are looking to do is add a new attribute to your script tag.

This could be done somewhat like this. I can't see the contents of differencehtml so I cannot be sure.

soup.find('script')['selected'] = '<path to your javascript file>'

Check this post for another example, BeautifulSoup - adding attribute to tag .

(EDIT) To get the code to look like this

<script> Hello World!</script>

you would just need to do tag.append("Hello World!") or place a variable that is a string inside append()

edited Aug 29, 2018 at 20:22

answered Aug 29, 2018 at 19:07

UCProgrammer

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3 Comments

Mir Over a year ago

Thanks for your help! But isn't modifying the contents the same as adding a new attribute? I did the following: soup.find('script')['selected'] = 'C:\\Users\\myname\\Documents\\my_file\\buttons.js and the resulting html looked like this: <script selected="C:\Users\myname\Documents\my_file\buttons.js"> </script>

Mir Over a year ago

I would like the code to look like this: <script> 'Hello World!' </script> and not <script selected = 'Hello World!'> </script>

UCProgrammer Over a year ago

@mir Sorry for misinterpreting. I edited the answer.

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