Django pass variable to template tag

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. If the first character is not a letter, this filter has no effect. If value is "django" , the output will be "Django".

If value is "Django" , the output will be " Django ". If value is "String with spaces" , the output will be "Stringwithspaces". These format characters are not used in Django outside of templates.

They were designed to be compatible with PHP to ease transitioning for designers. If value is a datetime object e. Note that predefined formats may vary depending on the current locale.

Assuming the same settings as the previous example:. You can combine date with the time filter to render a full representation of a datetime value. If value evaluates to False , uses the given default. Otherwise, uses the value.

If value is "" the empty string , the output will be nothing. If and only if value is None , uses the given default. Note that if an empty string is given, the default value will not be used. Use the default filter if you want to fallback for empty strings. If value is None , the output will be nothing. Takes a list of dictionaries and returns that list sorted in reverse order by the key given in the argument.

This works exactly the same as the above filter, but the returned value will be in reverse order. Returns True if the value is divisible by the argument. If value is 21 , the output would be True.

Applying escape to a variable that would normally have auto-escaping applied to the result will only result in one round of escaping being done. 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. Django field lookup - exact and iexact.

Python 3: Unexpected Exception: name 'basestring' is not defined when …. Recent Posts! Express - Fast, unopinionated, minimalist web framework for Node. Who is a fullstack developer. HTTP Request methods. Top Categories Python Django Software Development It is recommended to set the default of the autoescape parameter to True , so that if you call the function from Python code it will have escaping enabled by default.

We use autoescape to decide whether the input data needs to be passed through django. Finally, in the above example, we remember to mark the result as safe so that our HTML is inserted directly into the template without further escaping.

When this flag is set, if the first argument to your filter is a time zone aware datetime, Django will convert it to the current time zone before passing it to your filter when appropriate, according to rules for time zones conversions in templates.

Tags are more complex than filters, because tags can do anything. Django provides a number of shortcuts that make writing most types of tags easier. Many template tags take a number of arguments — strings or template variables — and return a result after doing some processing based solely on the input arguments and some external information.

This function, which is a method of django. Library , takes a function that accepts any number of arguments, wraps it in a render function and the other necessary bits mentioned above and registers it with the template system.

Note that the first argument must be called context. For example:. Then in the template any number of arguments, separated by spaces, may be passed to the template tag. This is done by using the as argument followed by the variable name. Doing so enables you to output the content yourself where you see fit:. Another common type of template tag is the type that displays some data by rendering another template.

Writing inclusion tags is probably best demonstrated by example. First, define the function that takes the argument and produces a dictionary of data for the result. The important point here is we only need to return a dictionary, not anything more complex.

This will be used as a template context for the template fragment. This template is a fixed feature of the tag: the tag writer specifies it, not the template designer. Following our example, the template is very short:. Following our example, if the above template is in a file called results.

Alternatively it is possible to register the inclusion tag using a django. Template instance:. Sometimes, your inclusion tags might require a large number of arguments, making it a pain for template authors to pass in all the arguments and remember their order. Note that the first parameter to the function must be called context. In that register.

Then, any time you want to use that custom tag, load its library and call it without any arguments, like so:. It automatically gets access to the context. The template system works in a two-step process: compiling and rendering.

To define a custom template tag, you specify how the compilation works and how the rendering works. Each node is an instance of django. Node and has a render method. It technically lets you run your applications on Kubernetes but without worrying Your web application uses GCKE clusters to operate efficiently but these clusters are spread across a variety of regions.

To make sure the clusters you launch on Kubernetes always perform optimally, take a moment to check their node numbers. If necessary, redistribute some nodes to spread the load evenly between clusters and better support your browsing habits. How to use locust for load testing.

John C Taylor November 6th , Locust provides a quick and easy way to perform distributed load tests on VMs and other applications. Unlike with some other load testing tools, users can monitor the process and identify bottlenecks or other weaknesses as they happen. Plus, Locust is compatible with all major architectures and server infrastructures.

How to set a static ip address in Ubuntu Server