Specify the lines of textfield to display

I want to make a preview of my article. How to select first several lines of TextField? I am using the flask and wtforms.

TextField

class Blog(Model):
content = TextField()


template:

{{blog.content}}


But how to specify the first several lines to display? For example, only display 4 lines. blog.content(rows = 4)

blog.content(rows = 4)

1 Answer
1

If blog.content consists of lines separated by newline characters, you can just split the content by newline and return the first four elements, joined:

blog.content

>>> content = 'OnenTwonThreenFournFivenSix'
>>> parts = content.split('n')
>>> preview = 'n'.join(parts[:4])
>>> preview # use this in the template {{ preview }}
'OnenTwonThreenFour'


If blog.content does not consist of lines separated by newline characters, you could use jinja2's truncate filter, which will output the first n characters of blog.content, where n is some number that you choose. If truncation occurs in the middle of a word, truncate will discard that word.

blog.content

blog.content

truncate

{{ blog.content|truncate(100) }}


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