Django template index page

Backends for other template languages may be available from third-parties. You can also write your own custom backend, see Custom template backend. Django defines a standard API for loading and rendering templates regardless of the backend. Loading consists of finding the template for a given identifier and preprocessing it, usually compiling it to an in-memory representation.

Rendering means interpolating the template with context data and returning the resulting string. Until Django 1. For historical reasons, both the generic support for template engines and the implementation of the Django template language live in the django.

For details see the language syntax reference. A Django template is a text document or a Python string marked-up using the Django template language. Some constructs are recognized and interpreted by the template engine.

The main ones are variables and tags. A template is rendered with a context. Rendering replaces variables with their values, which are looked up in the context, and executes tags.

Everything else is output as is. If a variable resolves to a callable, the template system will call it with no arguments and use its result instead of the callable. This definition is deliberately vague.

For example, a tag can output content, serve as a control structure e. A reference of built-in tags is available as well as instructions for writing custom tags. A reference of built-in filters is available as well as instructions for writing custom filters. For details see the API reference. Engine encapsulates an instance of the Django template system. The main reason for instantiating an Engine directly is to use the Django template language outside of a Django project.

DjangoTemplates is a thin wrapper adapting django. Template represents a compiled template. Templates are obtained with Engine.

Likewise django. How would I do it the best way? Django has updated urlpatterns to take 'path' instead of using url so it's become much more efficient. You don't have to use regex anymore. You may use each name in urls. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Best way of linking to a page in Django Ask Question.

Asked 7 years, 9 months ago. Active 1 year, 11 months ago. In that case, you generally use a for loop. However, it is a good practice to validate if the list of items is empty or not. The looping statement should only execute if the list contains some items. In that case, you can use an if-else template tag to verify if the list contains some items or not. In this section, I will demonstrate this with the help of an example.

I will render the names of the employees of a particular department in a Django template. In this way, you can use the if-else tag before a for loop to put a validation check on a variable. Entrepreneur, Founder, Author, Blogger, Trainer, and more. Check out my profile. How to use if statement in Django template If tag in Django template example If else tag in Django template If else tag in Django template example Django template if equal string If not condition in Django template Nested if else in Django template Multiple if condition in Django template For loop with if condition in Django template Table of Contents show.

How to use if statement in Django template. If tag in Django template example. If else tag in Django template. If else tag in Django template example. Django template if equal string. If not condition in Django template. Nested if else in Django template.

For loop with if condition in Django template. Output when the first number is greater than the second number. Default page output. Output when an odd number is entered. Entering the user input. Output when the string is not matched.

This is the negation of the in operator. Negated object identity. Tests if two values are not the same object. This is the negation of the is operator. You can also use filters in the if expression. All of the above can be combined to form complex expressions. For such expressions, it can be important to know how the operators are grouped when the expression is evaluated - that is, the precedence rules. The precedence of the operators, from lowest to highest, is as follows:.

This follows Python exactly. So, for example, the following complex if tag:. If you need different precedence, you will need to use nested if tags. Sometimes that is better for clarity anyway, for the sake of those who do not know the precedence rules.

For example, instead of using:. It has two possible uses. Checks its own rendered contents against its previous state and only displays the content if it has changed. For example, this displays a list of days, only displaying the month if it changes:. If given one or more variables, check whether any variable has changed. For example, the following shows the date every time it changes, while showing the hour if either the hour or the date has changed:. Loads a template and renders it with the current context.

The template name can either be a variable or a hard-coded quoted string, in either single or double quotes. The variable may also be any object with a render method that accepts a context. This allows you to reference a compiled Template in your context. An included template is rendered within the context of the template that includes it. This example produces the output "Hello, John! Context: variable person is set to "John" and variable greeting is set to "Hello". If you want to render the context only with the variables provided or even no variables at all , use the only option.

No other variables are available to the included template:. This means that there is no shared state between included templates — each include is a completely independent rendering process. Blocks are evaluated before they are included.

This means that a template that includes blocks from another will contain blocks that have already been evaluated and rendered - not blocks that can be overridden by, for example, an extending template. For example, the following template would load all the tags and filters registered in somelibrary and otherlibrary located in package package :. You can also selectively load individual filters or tags from a library, using the from argument.

See Custom tag and filter libraries for more information. The arguments are:. Such string can contain format specifiers characters as described in the date filter section. The predefined formats may vary depending on the current locale and if Format localization is enabled, e.

This complex tag is best illustrated by way of an example: say that cities is a list of cities represented by dictionaries containing "name" , "population" , and "country" keys:. The following snippet of template code would accomplish this:.

Group objects are instances of namedtuple with two fields:. Our example relies on the fact that the cities list was ordered by country in the first place.

If the cities list did not order its members by country , the regrouping would naively display more than one group for a single country. For example, say the cities list was set to this note that the countries are not grouped together :. The easiest solution to this gotcha is to make sure in your view code that the data is ordered according to how you want to display it.

Another solution is to sort the data in the template using the dictsort filter, if your data is in a list of dictionaries:. Any valid template lookup is a legal grouping attribute for the regroup tag, including methods, attributes, dictionary keys and list items.

Resets a previous cycle so that it restarts from its first item at its next encounter. Only the five-row cycle is reset when a category changes. Only space between tags is removed — not space between tags and text. See also the verbatim tag for another way of including these characters. Returns an absolute path reference a URL without the domain name matching a given view and optional parameters. The first argument is a URL pattern name. It can be a quoted literal or any other context variable.

Additional arguments are optional and should be space-separated values that will be used as arguments in the URL. The example above shows passing positional arguments. Alternatively you may use keyword syntax:. Do not mix both positional and keyword syntax in a single call. All arguments required by the URLconf should be present. The URLconf line might look like this:.

This will follow the normal namespaced URL resolution strategy , including using any hints provided by the context as to the current application.

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. In some cases you might want to capture the result of widthratio in a variable. It can be useful, for instance, in a blocktranslate like this:. Caches a complex variable under a simpler name. If value is 4 , then the output will be 6. This filter will first try to coerce both values to integers. This will work on some data types strings, list, etc.

If it fails, the result will be an empty string. Strings that can be coerced to integers will be summed , not concatenated, as in the first example above. Capitalizes the first character of the value.