djangocms-charts

DjangoCMS_Charts

A plugin for DjangoCMS that creates easy to use and fully customisable ChartJs (ver 2.x) charts - with a table and csv upload interface.

Updates

• 3.0.0
  • CAUTION - This is a complete refactoring of DjangoCMS Charts to ChartJS version 2.x
  • All Models, Fields, and Options have changed
  • Due to changes in ChartJS 1.x > 2.x - Not all Custom settings will be migrated
  • The migrations attempt to bring over any settings changed from the default values from each previous chart.
  • ChartJS is enabled by default - update settings to disable as below
  • All chart types are now available in the ChartsJS Plugin
  • Multiple Datasets can be added as Child Plugins of the parent ChartJS Plugin
  • Global Options are added in the Admin, as required.
  • All Options come from the ChartJS object/dictionary and are using a Select2 list

Quick start

1. Add 'djangocms_charts' to your INSTALLED_APPS setting like this::

   INSTALLED_APPS = [ ... 'djangocms_charts', ]

2. Run python manage.py migrate to create the djangocms_charts models.

3. Ensure you have your own version of jQuery added to block 'js'. See here: https://django-sekizai.readthedocs.io/en/latest/#example

4. Add a DjangoCMS ChartJS Plugin to your web page!

Caching [Optional]

The queries and building up of each chart can be expensive for many options/data rows/charts etc. To speed this up set up a dedicated DjangoCMS Charts cache. This should be a unique cache as it will require to be cleared after saving any charts object due to the complex relationship between all objects.

1. In settings.py add DJANGOCMS_CHARTS_CACHE = 'djangocms_charts' which should map to a unique cache.

2. In your CACHES add the charts cache - sample backend below - use your own cache system:

CACHES = {
    'default': {
        ...
    },
    'djangocms_charts':{
        'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
        'LOCATION': 'djangocms_charts',
        'TIMEOUT': CACHE_MIDDLEWARE_SECONDS,
        'OPTIONS': {
            'MAX_ENTRIES': 5000
        }
    },
}

URLS [Optional]

If access to the JSON Vesion of the chart is required add the following to your urls.py :

urlpatterns = [
    ...
    url(r'^chartjs/', include('djangocms_charts.urls')),
    ...
]

The JSON view can then be accessed via:

• Chart View: [url]/chartjs/get_chart_as_json/[chart_id]/
• Global Options View: [url]/get_global_options_as_json/[options_id]/

ChartJs-Sass [Optional]

All chart dataset colours (backgroundColor, borderColor, etc) can be set using CSS via ChartJS-Sass. This JS library will update any unspecified colors with those specified in the CSS and built using SASS. For more details see: https://github.com/mcldev/ChartJS-Sass

1. To disable/enable, in settings.py add DJANGOCMS_CHARTS_ENABLE_CHARTJS_SASS = True or False (default=True)

Usage

Chart Types

The following chart types can be selected with options (see below)

• Line
• Line XY (Scatter with line)
• Bar
• Horizontal Bar
• Radar
• Polar
• Pie
• Doughnut
• Bubble
• Scatter
• Mixed (see Multiple Datasets)

Input Data

All input data will be used as below.

NB: Multiple datasets can be added as either:

• Dataset Plugins as child to each Chart Plugin (customisable colours/formats etc)
• Multiple rows or columns within a Chart input table (scriptable colours/formats)

    # Line, Bar, Radar, Doughnut, Pie, PolarArea
    # ------------------------------------------
    # Datasets in 'cols' > TRANSPOSED
    #       Label_1,    Label_2, ...
    # Jan-20    10      30
    # Feb-20    20      40
    # ...
    #
    # OR
    #
    # Datasets in 'rows'    > USES THIS FORMAT INTERNALLY
    #       Jan-20      Feb-20, ...
    # Label_1   10      20
    # Label_2   30      40
    # ...
    #
    # Bubble [r], Scatter, Line_XY
    # ----------------------------
    # [r - radius - is ignored for line and scatter]
    #
    # Datasets in 'cols' > TRANSPOSED
    #   x   10   20     ...
    #   y   30   40     ...
    #  [r]   5   10     ...
    #
    # OR
    #
    # Datasets in 'rows'    > USES THIS FORMAT INTERNALLY
    #   x,      y,      [r]
    #   10      30      5
    #   20      40      10
    #   ...

Axes

https://www.chartjs.org/docs/latest/axes/

Multiple Axes can be added using X Axis or Y Axis. Each Axis can be used multiple times (e.g. Linear axis). Options for Axes are set below.

Multiple Datasets

https://www.chartjs.org/docs/latest/charts/mixed.html#drawing-order

Multiple datasets can be added as rows/columns of the main chart, or added as Dataset child plugins. The rendering order for ChartJS is that the first dataset is top-most - this plugin prepends the subsequent child datasets so the last dataset is top-most.

Mixed Types

https://www.chartjs.org/docs/latest/charts/mixed.html

Each child Dataset can have a different type, thus creating a Mixed Chart. NB: Some types do not mix well (Radar/Bar etc) - we make no validation on each possible combination.

Dataset Colors

Dataset Color Groups can be specified as a user-friendly list of colors, with a click-and-drag sortable feature.

Specifying the color group

Specifications for each group require the following:

• Type (select multiple types with Ctrl)
  • the Chart/Dataset type that these colors will be applied to
• Namespace Labels (select multiple types with Ctrl)
  • the dataset namespace labels that will use these colors
  • e.g. backgroundColor, borderColor, pointBackgroundColor, ...
• Colors
  • a text list of hex only colors
  • these can be selected/edited/rearranged through the interface

Application of Color Groups

These color groups can then be applied as follows:

• Globally
  • by assigning the color group to the Global Settings
  • any Chart/Dataset (without colors specified) will use these colors
• By Chart
  • all of the Chart datasets and any sub-datasets (without colors specified) will have these colors applied
• By Dataset
  • any Dataset can specifically use this Color Group

Color By Dataset or Series

The flag to set 'Color by Dataset' will do the following:

• Color by Dataset: True
  • Each individual Dataset will use one color from the color array based on its index
  • e.g. with a color array of [red, green, blue]

  #       Jan-20      Feb-20, ...
  # Label_1   10      20      <- red
  # Label_2   30      40      <- green
  # Label_3   50      60      <- blue
  

• Color by Series: False
  • Each individual Dataset will get the full color array to use for each element in Series
  • e.g. with a color array of [red, green, blue]

  #           Jan-20      Feb-20, ...
  # Label_1   10  <- red    20      <- green
  # Label_2   30  <- red    40      <- green
  # Label_3   50  <- red    60      <- green
  

Options

https://www.chartjs.org/docs/latest/configuration/

Options are set in JavaScript using the settings provided by ChartJS - Use this documentation: https://www.chartjs.org/docs/latest/

The Options are assigned in ascending order of priority as:

• Chart.defaults.global.<option> - see GlobalOptionsGroup in Admin
• chart.options.<option> - see ChartOptions Group selectable for each chart
• chart.options.<option> - see ChartSpecificOptions assigned to each chart individually
• dataset.<option> - see DatasetOptionsGroup selectable for each dataset
• dataset.<option> - see DatasetSpecificOptions assigned to each dataset individually
• chart.options.scales.<axes>.<option> - see AxisOptionsGroup selectable for each axis

Option Input Types

https://www.chartjs.org/docs/latest/general/options.html

ChartJS accepts various input option formats, some can be scripted, functions, numbers, or text. DjangoCMS Charts options can be input as any one of the following types:

NB. there is no validation of input types - Errors will appear in the console

• text
  • Any form of text input, such as a colour. e.g. #28aece
  • Sample output: {"option_name": "#28aece"}
• number
  • Either an integer or float can be input e.g. 2 or 3.5
  • A float (with a '.') will be converted to float
  • Sample output: {"option_name": 2}
• boolean
  • Text or number be cast to a boolean, can be any of 'true', 'false', 1, 0
  • Sample output: {"option_name": true}
• json
  • Text to be parsed and loaded as valid Json, e.g. ['red', 'blue', 'green']
  • Sample output: {"option_name": ["red", "blue", "green"]}
• array
  • Will split a string array into elements using the following (in order):
    • "\n" (new line)
    • "," (comma)
    • "\t" (tab)
    • " " (space)
  • Sample input: red blue green
  • Sample output: {"option_name": ["red", "green", "blue"}]
• function
  • A js function string that will be cleaned (new lines etc.) and injected into the code.
  • Can be a valid function name or complete function without comments
  • Sample:

  function(context) {
  var index = context.dataIndex;
  var value = context.dataset.data[index];
  return value < 0 ? 'red' :
      index % 2 ? 'blue' :  
      'green';
  }
  

More details on ChartJs

http://www.chartjs.org/

ChartJs is a dynamic JS charting application giving users an interactive and visually appealing chart in an html 5 canvas. Each type of chart is available: