This article is for those who don't read the documentation, and I, who had the Dash app for a few months now, which I never tinkered until last night.
During my first day on my internship a couple of months back, I was tasked to work on the scaffold of the company on which I was overwhelmed with the tags on it and never really bothered to research them.
Some of these are taken from the scaffold, some not.
Side note: There are spaces on the template tag because I have not figured out how to make the tags work on this site.
1.) for...empty
- The for tag can take an optional
{% empty %}
clause whose text is displayed if the given array is empty or could not be found:
{ % for student in student_list % } ... { % empty % } ... { % endfor % }Which is also equivalent to:
{ % if student_list % } { % for student in student_list % } ... { % endfor % } { % else % } ... { % endif % }
2.) lorem
- No, you don't need any other packages nor copy/paste a lorem text. This tag displays random “lorem ipsum” Latin text. This is useful for providing sample data in templates. Unless, of course, you don't.
{ % lorem [count] [method] [random] % }
e.g.
- { % lorem % } will output the common “lorem ipsum” paragraph. - { % lorem 3 p % } will output the common “lorem ipsum” paragraph and two random paragraphs each wrapped in HTMLtags. - { % lorem 2 w random % } will output two random Latin words.
3.) now
- Displays the current date and/or time, using a format according to the given string. Such string can contain format specifiers characters as described in the date filter section.
{ % now "jS F Y" % }
4.) resetcycle
- Resets a previous cycle so that it restarts from its first item at its next encounter. Without arguments,
{% resetcycle %}
will reset the last{% cycle %}
defined in the template.
{ % for coach in coach_list % } { { coach.name } } { % for athlete in coach.athlete_set.all % }{ { athlete.name } }
{ % endfor % } { % resetcycle % } { % endfor % }
This example would return this HTML:
José Mourinho
Thibaut Courtois
John Terry
Eden Hazard
Carlo Ancelotti
Manuel Neuer
Thomas Müller
5.) verbatim
Stops the template engine from rendering the contents of this block tag.
A common use is to allow a JavaScript template layer that collides with Django’s syntax. For example:
{ % verbatim % } { {if dying} }Still alive.{ {/if} } { % endverbatim % }
- You can also designate a specific closing tag, allowing the use of { % endverbatim % } as part of the unrendered contents:
{ % verbatim myblock % } Avoid template rendering via the { % verbatim % }{ % endverbatim % } block. { % endverbatim myblock % }
6.) widthratio
- For creating bar charts and such, this tag calculates the ratio of a given value to a maximum value, and then applies that ratio to a constant.
If this_value is 175, max_value is 200, and max_width is 100, the image in the above example will be 88 pixels wide (because 175/200 = .875; .875 * 100 = 87.5 which is rounded up to 88).
In some cases, you might want to capture the result of the width ratio in a variable. It can be useful, for instance, in a blocktrans like this:
{ % widthratio this_value max_value max_width as width % } { % blocktrans % }The width is: { { width } }{ % endblocktrans % }
Final side note: There are spaces on the template tag because I have not figured out how to make the tags work on this site.