CppConTimer

A full-screen countdown timer for conference presenters.

https://quuxplusone.github.io/CppConTimer

Original version by Jon Kalb.
Fully-client-side version by Arthur O'Dwyer.

Usage

The Timer Service is designed to generate pages that "count down" the time remaining in a session or a set of sessions.

The Timer Service can be used in One-Off Mode or Conference Mode.

One-Off Mode

In One-Off Mode, the Timer Service generates a page that counts down the time for a single session (as if it has already started) ending at a specific time.

Conference Mode

In order to use the Timer Service in Conference Mode, you will need to create a JSON data file that can be loaded from a URL. Here is an example: CppCon2018.json.

The JSON file represents an array of sessions. Each session is a dictionary with the following keys:

| Key | Required? | Data Type | Content | Meaning |------------|-----------|------------------|-----------------------------|---------------- | begin | required | string | datetime in ISO 8601 format | start time of session in local time | end | optional | string | datetime in ISO 8601 format | end time of session in local time | duration | optional | integer | positive values | duration of session, in minutes | tracks | optional | array of strings | track names | tracks in which this session should be included

Duration

If the end key is present, the duration is taken to be until that time. Otherwise if the duration key is present, the end of the session is calculated using that value. Otherwise the session is assumed to last for one hour.

Tracks

A single data file should be adequate for all the requirements of a single conference, even if that conference has multiple tracks with different sessions times. Any session without a tracks key is assumed to be in all tracks. If a tracks key is present, then the session is only added to the specified tracks.

URL

The timer service is invoked in one of these forms.

Conference Mode

• https://quuxplusone.github.io/CppConTimer/index.html?track=B&json=...

where:

• track is an optional track name (if not specified, only sessions without tracks will be used)
• json is the URL of the JSON-formatted file containing the session schedule

One-Off Mode

• https://quuxplusone.github.io/CppConTimer/index.html?end=3:00pm
• https://quuxplusone.github.io/CppConTimer/index.html?duration=60m

where:

• end is the end time of the one-off session
• duration is the length of the one-off session, in minutes

Times can be represented in ISO 8601 format (end=2018-04-01T01:23:45), or in "friendlier" formats (end=3:00pm, end=15:00). The parsing is handled by Moment.js. If you try something sensible and it doesn't work, please file an issue.

Durations can also be represented as seconds (duration=10s) and hours (duration=2h) for testing purposes.

Show Hours

By default, the time is shown as a number of minutes. Optionally, for times longer than 59 minutes, time can be shown as hours and minutes. Enable it by adding &show_hours=true to your URL.

Show Seconds

By default, the time is not shown with seconds (until the time remaining is less than ten minutes), but can optionally do so. Enable it by adding &show_seconds=true to your URL.

Class Mode

In "class mode" the timer always displays hours and seconds, is always in yellow on black (no color changes), and omits the flashing at five-minute intervals. Enable it by adding &class=true to your URL.