Django template tag to truncate text
DjangoDjango TemplatesDjango Problem Overview
Django has truncatewords
template tag, which cuts the text at the given word count. But there is nothing like truncatechars.
What's the best way to cut the text in the template at given char-length limit?
Django Solutions
Solution 1 - Django
Solution 2 - Django
{{ value|slice:"5" }}{% if value|length > 5 %}...{% endif %}
Update
Since version 1.4, Django have a built-in template tag for this:
{{ value|truncatechars:9 }}
Solution 3 - Django
I made my own template filter, that add "..." to the end of (last word of) the (truncated) string as well:
from django import template
register = template.Library()
@register.filter("truncate_chars")
def truncate_chars(value, max_length):
if len(value) > max_length:
truncd_val = value[:max_length]
if not len(value) == max_length+1 and value[max_length+1] != " ":
truncd_val = truncd_val[:truncd_val.rfind(" ")]
return truncd_val + "..."
return value
Solution 4 - Django
If you prefer to create your own custom template tag, consider to use the Django util Truncator in it. The following is a sample usage:
>>> from django.utils.text import Truncator
>>> Truncator("Django template tag to truncate text")
<Truncator: <function <lambda> at 0x10ff81b18>>
>>>Truncator("Django template tag to truncate text").words(3)
u'Django template tag...'
Truncator("Django template tag to truncate text").words(1)
u'Django...'
Truncator("Django template tag to truncate text").chars(20)
u'Django template t...'
Truncator("Django template tag to truncate text").chars(10)
u'Django ...'
Then you can put it in a template tag:
from django import template
from django.utils.text import Truncator
register = template.Library()
@register.filter("custom_truncator")
def custom_truncator(value, max_len, trunc_chars=True):
truncator = Truncator(value)
return truncator.chars(max_len) if trunc_chars else truncator.words(max_len)
Solution 5 - Django
Here it is in the Django Documentation, Built-in template tags and filters: truncatechars
Solution 6 - Django
You should write a custom template filter: http://docs.djangoproject.com/en/dev/howto/custom-template-tags/#writing-custom-template-filters
Have a look at how truncatewords
is built in django.utils.text
Solution 7 - Django
You can achieve your goal with similar code:
{{ value_of_text|truncatechars:NUM_OF_CHARS_TO_TRUNCATE}}
where NUM_OF_CHARS_TO_TRUNCATE
is number of chars to leave.
Solution 8 - Django
Solution 9 - Django
Adding a "truncate" filter was a feature request for 4 years but finally landed in trunk, as far as I understand https://code.djangoproject.com/ticket/5025 - so we’ve to wait for the next release or use trunk.