Random string in template django

Question

Is there any way to have a random string in a django template ?

I would like to have multiple strings displaying randomly like:

{% here generate random number rnd ?%}

{% if rnd == 1 %}
  {% trans "hello my name is john" %}
{% endif %}

{% if rnd == 2 %}
  {% trans "hello my name is bill" %}
{% endif %}

EDIT: Thanks for answer but my case needed something more specific as it was in the base template (wich I forgot to mention sorry ) . So after crawling google and some doc I fall on context processor article wich did the job, I found it a little bit "heavey" anyway just for generating a random number...

here is the blog page : http://www.b-list.org/weblog/2006/jun/14/django-tips-template-context-processors/

Template tag did not the trick (or i did not find how) as it return a tag that cannot be translated as I remember (see blocktrans doc)

I did not find a way to generate a number for the base view (is there any ?) and if there is a way better than context process i'd be glad to have some infos.

Answer 1

I guess you want to have a tag that generates random strings from some table containing strings. See this Django snippet:

http://djangosnippets.org/snippets/286/:

# model
class Quote(models.Model):
  quote = models.TextField(help_text="Enter the quote")
  by = models.CharField(maxlength=30, help_text="Enter the quote author")
  slug = models.SlugField(prepopulate_from=("by", "quote"), maxlength=25)
  def __str__(self):
    return (self.quote)

# template tag
from django import template
register = template.Library()
from website.quotes.models import Quote

@register.simple_tag
def random_quote():
  """
  Returns a random quote
  """
  quote = Quote.objects.order_by('?')[0]

  return str(quote)

Answer 2

Instead of using if-else blocks, passing a list of strings to your template and using random filter seems better

In your view:

my_strings = ['string1', 'string2', ...]
...
return render_to_response('some.html', {'my_strings':my_strings})

And in your template:

{{ my_strings|random }}

Here is the doc.

Answer 3

You could do something like that:

{# set either "1" or "2" to rnd, "12"|make_list outputs the list [u"1", u"2"] #}
{# and random chooses one item randomly out of this list #}

{% with rnd="12"|make_list|random %}
    {% if rnd == "1" %}
        {% trans "hello my name is john" %}
    {% elif rnd == "2" %}
        {% trans "hello my name is bill" %}
    {% endif %}
{% endwith %}

Look at the "Built-in template tags and filters" documentation for more info: https://docs.djangoproject.com/en/1.4/ref/templates/builtins/

Answer 4

You should write a custom template tag, see this one (with close functionality) as an example: http://djangosnippets.org/snippets/150/, but if it is not critical, to array of lines in the template, I would rather generete this random string in view.

Answer 5

In case you want to include random template and have it available globally :

in context_processors:

def sample(request):
  my_strings = ['string1', 'string2', ...]
  return {banners: my_stirngs}

in tempale (giving that your includes are in 'inc' folder ):

  {% with banners|random as template %}
    {% include 'inc/'|add:template %}
  {% endwith %}  

Answer 6

In a template:

{% random_number as rnd %}
The best 6 digits (by default) random number is: {{ rnd }}

{% random_number 9 as rnd9 %}
The best 9 digit random number is: {{ rnd9 }}

In markup.py:

@register.assignment_tag()
def random_number(length=6):
    from random import randint
    return randint(10**(length-1), (10**(length)-1))

Taken from https://djangosnippets.org/snippets/2984/