reflex-knightlab-timeline

• Source: https://github.com/ecrespo/reflex-knightlab-timeline
• PyPI: https://pypi.org/project/reflex-knightlab-timeline/
• Issues: https://github.com/ecrespo/reflex-knightlab-timeline/issues

A native Reflex component that wraps Knight Lab TimelineJS so you can build interactive, storytelling timelines in pure Python — no HTML, no iframe, no hand-written JavaScript.

It was built by migrating the certifications timeline from the reflex_resume project (which used an iframe → static timeline.html → fetch(timeline.json)) into a reusable, reactive, version-pinned component.

import reflex as rx
from reflex_knightlab_timeline import timeline, TimelineData, Event, Text, TLDate

DATA = TimelineData(events=[
    Event(start_date=TLDate(2024, 12, 14),
          text=Text("Claude Code in Action", "Anthropic Academy")),
    Event(start_date=TLDate(2023, 11, 22),
          text=Text("Data Scientist with Python", "Datacamp")),
])

def index() -> rx.Component:
    return timeline(data=DATA, height="600px")

app = rx.App()
app.add_page(index)

Why native instead of an iframe?

Install

pip install reflex-knightlab-timeline
# or, from this repo:
pip install -e .

Reflex installs the underlying npm package (@knight-lab/timelinejs@3.9.11) automatically on first run.

Usage

Data: three ways

from reflex_knightlab_timeline import (
    timeline, TimelineData, Event, Slide, Era, TLDate, Text, Media, Background,
    TimelineOptions, load_timeline_data,
)

# 1) Typed builders
data = TimelineData(
    title=Slide(text=Text("My Journey")),
    events=[Event(start_date=TLDate(2024, 12, 14),
                  text=Text("A cert", "Description"),
                  media=Media(url="https://...", credit="Coursera"))],
    eras=[Era(TLDate(2018), TLDate(2024), Text("Career"))],
    scale="human",
)

# 2) A raw dict (the TimelineJS JSON format)
data = {"events": [{"start_date": {"year": "2024"}, "text": {"headline": "A"}}]}

# 3) Load an existing timeline.json (e.g. migrated from reflex_resume)
data = load_timeline_data("assets/timeline.json")

Options (all TimelineJS options supported)

opts = TimelineOptions(
    timenav_position="bottom",   # "top" | "bottom"
    timenav_height=200,
    scale_factor=2,
    initial_zoom=2,
    hash_bookmark=False,
    default_bg_color={"r": 255, "g": 255, "b": 255},
    language="es",
    theme="dark",                # "dark" | "contrast" | custom CSS url
)
timeline(data=data, options=opts, height="700px")

Events → Python

class State(rx.State):
    current: str = ""

    @rx.event
    def on_slide(self, unique_id: str):
        self.current = unique_id

timeline(data=data, on_change=State.on_slide)

Supported events: on_change, on_loaded, on_dataloaded, on_nav_next, on_nav_previous, on_zoom_in, on_zoom_out, on_back_to_start.

TimelineJS needs an explicitly sized container — width defaults to "100%" and height to "600px"; override as needed.

Demo

cd timeline_demo
reflex run

The demo renders (1) a timeline authored in Python, and (2) the 178-certification timeline migrated 1:1 from reflex_resume, with live on_change updating state.

Development & tests (TDD)

This package was built test-first. The data layer is pure Python (no Reflex needed); the component contract tests require Reflex.

pip install -e ".[dev]"
pytest            # 43 tests

Project layout

custom_components/reflex_knightlab_timeline/
  models.py     # typed TimelineJS data builders
  options.py    # all TimelineJS presentation options
  timeline.py   # the native rx.Component (ref + useEffect wrapper)
timeline_demo/  # Reflex demo app (parity with reflex_resume)
tests/          # pytest suite
specs/          # Spec-Driven Design artifacts (PRD, Tech, Data, API, Plan, Migration)

See specs/ for the full design, and specs/migration/iframe-to-native.md for how to swap the old iframe in reflex_resume.

Credits

• TimelineJS3 © Northwestern University Knight Lab (MPL/own license — see their repo).
• Built on Reflex.

License

MIT — see LICENSE.