107 lines
3.3 KiB
JavaScript
107 lines
3.3 KiB
JavaScript
'use strict'
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/*
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Open Rowing Monitor, https://github.com/laberning/openrowingmonitor
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This is currently a very simple Web UI that displays the training metrics. Does not use any bundling
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or transpiling yet.
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*/
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// eslint-disable-next-line no-unused-vars
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export function createApp () {
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const fields = ['strokesTotal', 'distanceTotal', 'caloriesTotal', 'power', 'splitFormatted', 'strokesPerMinute', 'durationTotal']
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initWebsocket()
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resetFields()
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requestWakeLock()
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function initWebsocket () {
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// use the native websocket implementation of browser to communicate with backend
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// eslint-disable-next-line no-undef
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const socket = new WebSocket(`ws://${location.host}`)
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socket.addEventListener('open', (event) => {
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console.log('websocket openend')
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})
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socket.addEventListener('error', (error) => {
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console.log('websocket error', error)
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socket.close()
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})
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socket.addEventListener('close', (event) => {
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console.log('websocket closed, attempting reconnect')
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setTimeout(() => {
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initWebsocket()
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}, 1000)
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})
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socket.addEventListener('message', (event) => {
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try {
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const data = JSON.parse(event.data)
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for (const [key, value] of Object.entries(data)) {
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if (fields.includes(key)) {
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document.getElementById(key).innerHTML = value
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}
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}
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} catch (err) {
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console.log(err)
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}
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})
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}
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async function requestWakeLock () {
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// use the Wake Lock API to prevent the screen from going to standby
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if (!('wakeLock' in navigator)) {
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console.log('Browser does not support Wake Lock API (or maybe we are not using SSL).' +
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'Now enforcing the screen with a hack, user has to click once for this to work...')
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// Chrome enables the new Wake Lock API only if the connection is secured via SSL
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// This is quite annoying for IoT use cases like this one, where the device sits on the
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// local network and is directly addressed by its IP.
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// In this case the only way of using SSL is by creating a self signed certificate, and
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// that would pop up different warnings in the browser (and also prevents fullscreen via
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// a home screen icon so it can show these warnings). Okay, enough ranting :-)
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// In this case we use the good old hacky way of keeping the screen on via a hidden video.
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// eslint-disable-next-line no-undef
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const noSleep = new NoSleep()
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document.addEventListener('click', function enableNoSleep () {
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document.removeEventListener('click', enableNoSleep, false)
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noSleep.enable()
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}, false)
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} else {
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try {
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await navigator.wakeLock.request('screen')
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console.log('Wake Lock is active')
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} catch (err) {
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console.log(err)
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}
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}
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}
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function resetFields () {
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for (const key of fields) {
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document.getElementById(key).innerHTML = '--'
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}
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}
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function toggleFullscreen () {
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const fullscreenElement = document.getElementById('dashboard')
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if (!document.fullscreenElement) {
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fullscreenElement.requestFullscreen({ navigationUI: 'hide' })
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} else {
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if (document.exitFullscreen) {
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document.exitFullscreen()
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}
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}
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}
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function reset () {
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resetFields()
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socket.send(JSON.stringify({ command: 'reset' }))
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}
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return {
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toggleFullscreen,
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reset
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}
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}
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