Parley

(noun)

Pronunciation: /ˈpɑːrli/

Definition: A formal discussion or negotiation between parties, especially enemies, typically to resolve a conflict or dispute peacefully. It often implies a temporary truce or cessation of hostilities to facilitate dialogue.

Example Sentence: The warring factions agreed to a parley at the neutral ground to seek a diplomatic solution to their long-standing conflict.

Introduction

The motivation behind this software is simple: to develop a completely static HTML Form that can be deployed anywhere (including on GitHub Pages), to allow for simple configuration (i.e. no need to edit the web source directly) using a JSON file (config.json), and for the software to be RIGOROUSLY tested (using pytest) to prove the features work. That is what Parley is about: a "once for all" solution for those who need a simple, testable, and stable form solution now.

Features

Here we will attempt to list all the features that are available and tested in the software:

• configuration through JSON: the website is meant to be configured/customized through the config.json file (see below).

• HTML in configurable text: all text meant to be configured through the config.json file work with HTML tags (including instructions, and question labels):

  {
    "instructions": "<i>All</i> work and <b>NO</b> play make Jack a dull boy.",
  }

• multiline strings with arrays: all text meant to be configured through the config.json file can be of type string or type array (i.e. instructions, and question labels):

  {
    "questions": [
      {
        "label": [
          "This is a very long question that could span multiple lines and easily",
          "extend off the page. It can also have an",
          "<a href='https://developer.mozilla.org/en-US/docs/Web/HTML'>HTML Link</a>",
          "embedded into it as mentioned in the previous feature explanation.",
          "You can easily write LONG LONG questions and style or add links to the",
          "questions using <b>HTML syntax</b>."
        ],
        "name": "message",
        "type": "textarea",
        "required": true
      }
    ]
  }

• custom usage instructions: the instructions for using the form have been made configurable through the config.json file, allowing for a custom usage message to be supplied to the client.

• email in usage instructions by adding HTML tag with the class property set to email-placeholder placeholder, your email will be extracted from the config.json file and rendered into the text:

  Send form to: <strong class='email-placeholder'>[Email Address]</strong>.

Usage

Here we outline the Parley software's intended use. Specifically we will go over the config.json schema and what is supported vs. disallowed.

Configuration

Below is a minimal configuration of the Parley software:

{
  "instructions": "Your custom form usage instructions",
  "subject": "Your Form Subject",
  "title": "Your Custom Title",
  "send_button_text": "Custom Submit Text",
  "download_button_text": "Custom Download Text",
  "missing_field_message": "Custom Missing Field Alert Message",
  "enable_form_download": true,
  "form_backend_url": null,
  "ignore_file_upload": false,
  "email": "[email protected]",
  "questions": [
    {
      "label": "Message",
      "name": "message",
      "type": "textarea",
      "required": true
    }
  ]
}

The above example config file is written in JSON, and each attribute will be explained below in more detail (NOTE: attributes with a * mark are required):

• instructions: The (optional) custom form usage instructions.
• subject(*): The email subject that will be submitted by the form.
• title(*): The text that will be set in the title element.
• send_button_text: Set custom text for send button (optional).
• download_button_text: Set custom text for download buttin (optional).
• missing_field_message: Set custom missing field alert text (optional).
• enable_form_download: Allow form to be downloaded (optional).
• form_backend_url: The (optional) form backend URL for submitting forms to.
• ignore_file_upload: When true files will not be uploaded (optional).
• email: The (optional) email used by the mailto attribute and used in the instructions above the form.
• questions(*): The questions used to dynamically populate the form.
  • label(*): The actual question text placed above the form input field.
  • name(*): The variable name used as the "key" in the form submission query string.
  • type(*): The type of input to expect from the user (discussed below).
  • required(*): Questions with this value set to true must be answered before form will submit.

Basic Input Types

As discussed above, there are a few different input types currently available. These are listed below:

• date
• datetime-local
• email
• file
• number
• selectbox
• tel
• text
• textarea
• time
• url

Information describing these types can be found in the MDN Input Element Docs,¹ except for selectbox and textarea which are custom input types.

Custom Input Types

While setting the input type to textarea simply allows you to use a textarea element (as opposed to an input element of type text), setting the input type to selectbox is a little more interesting:

{
  "subject": "Your Form Subject",
  "title": "Your Custom Title",
  "form_backend_url": null,
  "email": "[email protected]",
  "questions": [
    {
      "label": "Select your country",
      "name": "country",
      "type": "selectbox",
      "required": true,
      "options": [
        {"label": "--Select--", "value": "", "selected": true, "disabled": true},
        {"label": "USA", "value": "USA"},
        {"label": "Canada", "value": "CAN"},
        {"label": "United Kingdom", "value": "UK"},
        {"label": "Australia", "value": "AUS"}
      ],
      "custom": {
        "multiple": true
      }
    }
  ]
}

When using the selectbox input type, you now have access to the options attribute, where you can set the different options that will be "selectable" by the user. Each option has 4 possible attributes (NOTE: attributes with a * mark are required):

• label(*): The text displayed to the user in the selectbox.
• value(*): The text sent upon form submission in the "query string".
• selected: A boolean value that initializes this option as selected by default.
• disabled: A boolean value that prohibits the user from selecting this option.

While you can set the options attribute in the config.json file for a question without setting the type to selectbox, nothing will happen but the website should function normally.

Additional Attributes

You will notice in the above section the presence of a custom attribute:

{
  "custom": {
    "multiple": true
  }
}

The role of this attribute is to configure ANY additional attributes related to the form input element you are using for your "question." In this case we are setting the multiple attribute to true for the select element (so that the user can select multiple options in the selectbox).

Development

Here we introduce the various tools related to developing the Parley software.

Make

A Makefile is available in the project root, and implements several commands to make the development process easier. All commands are executed by the following format: make [COMMAND]. To see the contents of a command that will be executed upon invocation of the command, simply run make -n [COMMAND] (NOTE: this serves as a good way to test a command and see what exactly will be executed before running the command). Below is the list of the commands and their short descriptions:

• build: Build the Docker image
• serve: Serve the website
• server-container: Build server container
• pause: Pause 1 second (to pause between commands)
• address: Get Docker container address/port
• stop-server: Stop the running web server
• restart-server: Restart the running web server
• lint: Run linters
• test: Run full testing suite
• pytest: Run pytest in Docker container
• isort: Run isort in Docker container
• black: Run black in Docker container
• flake8: Run flake8 in Docker container
• mypy: Run mypy in Docker container
• shell: Create interactive shell in Docker container

Example Uses

Here we will show some common use cases for the Makefile:

• serve the website locally: running the make serve will serve the website and print out the host/address to your terminal.

• test the website locally: running the make pytest will run ONLY the Python tests (written with pytest) on the current website.

• build docker image: running make build will build the ghcr.io/diogenesanalytics/parley:master Docker image locally.

• stop the web server: running make stop-server will stop any currently running server deployed by make serve.

• get local server address: running make address will get the host/port for the server deployed previously by make serve (if any exist).

• run specific tests: running make shell will allow start up a bash instance inside the ghcr.io/diogenesanalytics/parley:master Docker image, from which you can then run a specific subset of tests (e.g. pytest -m website).

References

Footnotes

1. https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input#input_types ↩