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Extensions for using Django with htmx.

Project description

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Extensions for using Django with htmx.

Requirements

Python 3.6 to 3.9 supported.

Django 2.2 to 3.2 supported.


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Installation

  1. Install with pip:

    python -m pip install django-htmx
    
  2. Add django-htmx to your INSTALLED_APPS:

    INSTALLED_APPS = [
        ...,
        "django_htmx",
        ...,
    ]
    
  3. Add the middleware:

    MIDDLEWARE = [
        ...,
        "django_htmx.middleware.HtmxMiddleware",
        ...,
    ]
    
  4. (Optional) Add the extension script to your template, as documented below.

Example app

See the example app in the example/ directory of the GitHub repository for usage of django-htmx.

Reference

Extension Script

django-htmx comes with a small JavaScript extension for htmx’s behaviour. Currently the extension only includes a debug error handler, documented below.

The script is served as a static file called django-htmx.js, but you shouldn’t reference it directly. Instead, use the included template tags, for both Django and Jinja templates. You probably want to include the relevant template tag after your htmx script tag.

For Django Templates, load and use the template tag:

{% load django_htmx %}
{% django_htmx_script %}

For Jinja Templates, you need to perform two steps. First, load the tag function into the globals of your custom environment:

# myproject/jinja2.py
from jinja2 import Environment
from django_htmx.jinja import django_htmx_script


def environment(**options):
    env = Environment(**options)
    env.globals.update({
        # ...
        'django_htmx_script': django_htmx_script,
    })
    return env

Second, call the function in your base template:

{{ django_htmx_script() }}

Debug Error Handler

htmx’s default behaviour when encountering an HTTP error is to discard the response. This can make it hard to debug errors in development.

The django-htmx script includes an error handler that’s active when debug mode is on. The handler detects responses with 404 and 500 status, codes and replaces the page with their content. This change allows you to debug with Django’s default error responses as you would for a non-htmx request.

See this in action in the “Error Demo” section of the example app.

django_htmx.middleware.HtmxMiddleware

This middleware attaches request.htmx, an instance of HtmxDetails.

See it action in the “Middleware Tester” section of the example app.

django_htmx.middleware.HtmxDetails

This class provides shortcuts for reading the htmx-specific request headers.

__bool__(): bool

True if the request was made with htmx, otherwise False. This is based on the presence of the HX-Request header.

This allows you to switch behaviour for requests made with htmx like so:

def my_view(request):
    if request.htmx:
        template_name = "partial.html"
    else:
        template_name = "complete.html"
    return render(template_name, ...)

current_url: str | None

The current URL of the browser, or None for non-htmx requests. Based on the HX-Current-URL header.

history_restore_request: bool

True if the request is for history restoration after a miss in the local history cache. Based on the HX-History-Restore-Request header.

prompt: str | None

The user response to hx-prompt if it was used, or None.

target: str | None

The id of the target element if it exists, or None. Based on the HX-Target header.

trigger: str | None

The id of the triggered element if it exists, or None. Based on the HX-Trigger header.

trigger_name: str | None

The name of the triggered element if it exists, or None. Based on the HX-Trigger-Name header.

triggering_event: Any | None

The deserialized JSON representtation of the event that triggered the request if it exists, or None. This header is set by the event-header htmx extension, and contains details of the DOM event that triggered the request.

django_htmx.http.HttpResponseStopPolling: type[HttpResponse]

When using a polling trigger, htmx will stop polling when it encounters a response with the special HTTP status code 286. HttpResponseStopPolling is a custom response class with that status code.

For example:

from django_htmx.http import HttpResponseStopPolling

def my_pollable_view(request):
    if event_finished():
        return HttpResponseStopPolling()
    ...

django_htmx.http.HTMX_STOP_POLLING: int

A constant for the HTTP status code 286, for use with e.g. Django’s render shortcut.

from django_htmx.http import HTMX_STOP_POLLING

def my_pollable_view(request):
    if event_finished():
        return render("event-finished.html", status=HTMX_STOP_POLLING)
    ...

Project details


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