Django template filters custom

So it is safe to use this function even in auto-escaping environments. For example, you can apply escape to fields when autoescape is off:. Escapes characters for use in JavaScript strings. If value is , the output would be If value is the list ['a', 'b', 'c'] , the output will be 'a'. If used with a numeric integer argument, floatformat rounds a number to that many decimal places.

Particularly useful is passing 0 zero as the argument which will round the float to the nearest integer. For example, when the active locale is en English :. For example, when the active locale is pl Polish :. Using floatformat with no argument is equivalent to using floatformat with an argument of The g suffix to force grouping by thousand separators was added.

The u suffix to force disabling localization was added. Applies HTML escaping to a string see the escape filter for details. This filter is applied immediately and returns a new, escaped string. This is useful in the rare cases where you need multiple escaping or want to apply other filters to the escaped results. Normally, you want to use the escape filter.

Given a whole number, returns the requested digit, where 1 is the right-most digit, 2 is the second-right-most digit, etc. Returns the original value for invalid input if input or argument is not an integer, or if argument is less than 1. Otherwise, output is always an integer.

If value is , the output will be 8. If value is "? This is compatible with a strict Content Security Policy that prohibits in-page script execution. It also maintains a clean separation between passive data and executable code. If value is the list ['a', 'b', 'c', 'd'] , the output will be the string "d".

If value is ['a', 'b', 'c', 'd'] or "abcd" , the output will be 4. The filter returns 0 for an undefined variable. If value is ['a', 'b', 'c', 'd'] or "abcd" , the output will be True. If value is Django , the output will be "Django ". Returns the value turned into a list. For an integer, the argument is cast to a string before creating a list. If value is the string "Joel" , the output would be the list ['J', 'o', 'e', 'l']. If value is , the output will be the list ['1', '2', '3']. Returns a plural suffix if the value is not 1 , '1' , or an object of length 1.

By default, this suffix is 's'. For words that require a suffix other than 's' , you can provide an alternate suffix as a parameter to the filter. Use blocktranslate to pluralize translated strings. A wrapper around pprint. If value is the list ['a', 'b', 'c', 'd'] , the output could be "b".

If value is Django , the output will be " Django". Marks a string as not requiring further HTML escaping prior to output. When autoescaping is off, this filter has no effect. If you are chaining filters, a filter applied after safe can make the contents unsafe again.

For example, the following code prints the variable as is, unescaped:. Applies the safe filter to each element of a sequence. Useful in conjunction with other filters that operate on sequences, such as join. Converts spaces to hyphens. Converts to lowercase. Also strips leading and trailing whitespace. If value is "Joel is a slug" , the output will be "joel-is-a-slug". Formats the variable according to the argument, a string formatting specifier.

If value is 10 , the output will be 1. If you are looking for something more robust, you can use the bleach Python library, notably its clean method. Note that the predefined format is locale-dependent. If value is equivalent to datetime. The time filter will only accept parameters in the format string that relate to the time of day, not the date.

If you need to format a date value, use the date filter instead or along with time if you need to render a full datetime value. There is one exception the above rule: When passed a datetime value with attached timezone information a time-zone-aware datetime instance the time filter will accept the timezone-related format specifiers 'e' , 'O' , 'T' and 'Z'.

Takes an optional argument that is a variable containing the date to use as the comparison point without the argument, the comparison point is now. Similar to timesince , except that it measures the time from now until the given date or datetime. Takes an optional argument that is a variable containing the date to use as the comparison point instead of now. Converts a string into titlecase by making words start with an uppercase character and the remaining characters lowercase.

Truncates a string if it is longer than the specified number of characters. If value is "Joel is a slug" , the output will be "Joel i…". Similar to truncatechars , except that it is aware of HTML tags. Any tags that are opened in the string and not closed before the truncation point are closed immediately after the truncation.

If value is "Joel is a slug" , the output will be "Joel is …". Similar to truncatewords , except that it is aware of HTML tags. Any tags that are opened in the string and not closed before the truncation point, are closed immediately after the truncation.

This is less efficient than truncatewords , so should only be used when it is being passed HTML text. The list is assumed to be in the proper format. An empty string can be provided when all characters should be escaped. It also supports domain-only links ending in one of the original top level domains.

For example, djangoproject. Links can have trailing punctuation periods, commas, close-parens and leading punctuation opening parens , and urlize will still do the right thing. If value is "Check out www. In addition to web links, urlize also converts email addresses into mailto: links. If value is "Send questions to foo example. The urlize filter also takes an optional parameter autoescape. The default value for autoescape is True.

Apply this filter only to plain text. Converts URLs and email addresses into clickable links just like urlize , but truncates URLs longer than the given character limit. As with urlize , this filter should only be applied to plain text. If value is "Joel is a slug" , the output will be 4. If value is Joel is a slug , the output would be:. Django provides template tags and filters to control each aspect of internationalization in templates.

They allow for granular control of translations, formatting, and time zone conversions. This library allows specifying translatable text in templates. See Internationalization: in template code. This library provides control over the localization of values in templates. See Controlling localization in templates.

This library provides control over time zone conversions in templates. See Time zone aware output in templates. Strengthen your foundations with the Python Programming Foundation Course and learn the basics. Recommended Articles. Article Contributed By :. Easy Normal Medium Hard Expert. Writing code in comment?

Please use ide. Load Comments. What's New. Most popular in Python. Most visited in Web Technologies. You should check the names assigned to your views. They should match those used with register.

You may also have to consider the auto-escaping behavior of Django with the filter. You may look at the Django documentation to learn more. Template tags are more advanced than filters. They are powerful in that they can process any data and made it available to any template regardless of the view being executed.

Django provides two commonly used helper functions to create tags:. These tags take any number of arguments and return a result after some processing. The simple tag is a function that takes one or more arguments, wraps it in a render function, and registers it with the template system.

We are going to do two examples of simple tags. Our first simple tag will count the number of contacts we have. These tags work by rendering another template and are essential when working with information that is to be found on several pages.

You have now successfully created your custom template tags and filters. You should now be able to create new template tags and filters and apply them anywhere they are needed in your Django application.