Django Template language Intro

Django follows the MVC (Model = database-logic, View=business-logic Controller=presentation logic ). We can write the required logics based on programming[python] syntax in models and views but, when we want to write simple logics we should follow the django's template syntax, because programming[python] syntax is not allowed.

We have the Template syntax as follows:

Syntax

Explanation

Example

To display the variable value. Just like " print " as in python

input:
Welcome "{{ request.user.username }}"
output:
Welcome "Abhi Ram"

{% if condition %}
--- logic ----
{% endif %}

It is a conditional expression same as " if " condition in python

input:
{% if request.user.can_edit %}
<button> Edit </button>
{% endif %}
output:
if user has attribute "can_edit" as True then it will give result
" <button> Edit </button> "
nothing otherwise.

{% if condition1 %}
--logic--
{% elif condition2 %}
-- logic--
{% else %}
-- logic --
{% endif %}

same as python's " if...elif....else "

just like above

{% for iterable object %}
--logic--
{% endfor %}

takes an iterable object returns an iterator object in every iteration.
To get reverse indexes use " forloop.revcounter "

input: users = ["Naveen", "Ramu", "Danny", "Shera"]
{% for user in users %}
{% if forloop.first %} First iter {% endif%}
   {{ forloop.counter }} . {{ user }}
     {% if forloop.last %} Last iter {% endif%}
{% endfor %}
output:
   First iter
    1. Naveen
2. Ramu
3. Danny
4. Shera
Last iter

{% with author_books = request.user|getbooks %}
-- logic --
{% endwith %}

access the variable within the block. it's used when we require the same varialbe multiple times

{% include 'sub_template.html' with context=context %}
or
{% include 'menu.html' %}

This will include the partial tempate data by rendering it with the context

{% load library %}

This will load the given library and made its functionality(tags) available in the template

{% load tag from library %}

This will load a specific tag from the given library

{% url "namespace:name" var1=1 va2=2 %}

This will generate the url by taking app namespace , view name and required data

{% autoescape on|off %}
{{ data }}
{% endautoescape %}

It will stop the XSS vulnerabilities from the script.

{% now %}

This gives current datetime and timezone

Todays date: {% now "f" %}

To convert the text to lowercase

{{ "Hello world"|lower }} gives "hello world"

To convert the text to uppercase

{{ "Hello world"|upper }} gives "HELLO WORLD"

To convert the first letter to uppercase

{{ "hyderabad"|capfirst }} gives "Hyderabad"

converts the text to title case

{{ "hellow world"|title }} gives "Hello World"

converts given text to slug form

{{ "hello world "|slugify }} gives "hello-world"

counts the number of words in the text

{{ "this is micropyramid world"|wordcount }} gives "4"

show's characters up to number "n"

{{ "this is micropyramid"|truncatechars: 7}} gives "this is ..."

show's words up to number "n"

{{ "this is micropyramid"|truncatechars: 2}} gives "this is ..."

returns the no of objects in quesry set

returns the sliced query set

{{ query_set|slice:"3:5" }} same as "query_set[3:5]"

sort's the query_set based on the given key

sort's the query_set based on the given key in reversed order

if variable is not provided then default value is replaced

return the date in a given format

Same usages as in views:
Operators: == , = , > , >= , < , <=,
Keywords: and , or , not

Posted On 17 June 2016 By MicroPyramid

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