main.py

from datetime import datetime as dt

from pyscript import document
from pyweb import pydom

tasks = []

def q(selector, root=document):
    return root.querySelector(selector)

# define the task template that will be use to render new templates to the page
# Note: We use JS element here because pydom doesn't fully support template 
#       elements now
task_template = pydom.Element(q("#task-template").content.querySelector(".task"))

task_list = pydom["#list-tasks-container"][0]
new_task_content = pydom["#new-task-content"][0]


def add_task(e):
    # ignore empty task
    if not new_task_content.value:
        return None

    # create task
    task_id = f"task-{len(tasks)}"
    task = {
        "id": task_id,
        "content": new_task_content.value,
        "done": False,
        "created_at": dt.now(),
    }

    tasks.append(task)

    # add the task element to the page as new node in the list by cloning from a
    # template
    task_html = task_template.clone()
    task_html.id = task_id

    task_html_check = task_html.find("input")[0]
    task_html_content = task_html.find("p")[0]
    task_html_content._js.textContent = task["content"]
    task_list.append(task_html)

    def check_task(evt=None):
        task["done"] = not task["done"]
        task_html_content._js.classList.toggle("line-through", task["done"])

    new_task_content.value = ""
    task_html_check._js.onclick = check_task


def add_task_event(e):
    if e.key == "Enter":
        add_task(e)


new_task_content.onkeypress = add_task_event