How to use readBattery method in Playwright Internal

Best JavaScript code snippet using playwright-internal

ReadBattery.js

Source: ReadBattery.js Github

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1import React, { useState } from 'react';2import classes from './​ReadBattery.module.css';3export default function ReadBattery() {4 const [ message, setMessage ] = useState("_");5 const handleClick = () => {6 setMessage("_");7 navigator.bluetooth.requestDevice({8 filters: [{9 services: ['battery_service']10 }]11 }).then(device => {12 console.log('Got device:', device.name);13 console.log('id:', device.id);14 return device.gatt.connect(); /​/​ Chromium 49 and below use `connectGATT()` but from Chromium 50 it will use gatt.connect();15 })16 .then(server => {17 console.log('Getting Battery Service…');18 return server.getPrimaryService('battery_service');19 })20 .then(service => {21 console.log('Getting Battery Characteristic…');22 return service.getCharacteristic('battery_level');23 })24 .then(characteristic => {25 console.log('Reading battery level…');26 return characteristic.readValue();27 })28 .then(value => {29 value = value.buffer ? value : new DataView(value);30 console.log('Battery percentage:', value.getUint8(0));31 32 /​/​setMessage('Battery percentage: ' + value.getUint8(0));33 setMessage(value.getUint8(0));34 })35 .catch(exception => {36 console.log(exception);37 });38 }39 return (40 <div className={classes.container}>41 <div className={classes.control}>42 <button onClick={handleClick} className={classes.button}>Read Battery Level</​button>43 </​div>44 <div className={classes.status}>45 46 <div className={classes.display}>47 <p className={classes.message}>Battery Level:</​p>48 <p className={classes.submessage}>49 <span className={classes.value}>{message}</​span>50 <span className={classes.unit}>%</​span>51 </​p>52 </​div>53 54 55 </​div>56 </​div>57 )...

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index.js

Source: index.js Github

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...48 document.querySelector('.battery-fully').innerHTML = fully49 document.querySelector('.battery-remaining').innerHTML = remaining50 }51 if (navigator.battery) {52 readBattery(navigator.battery)53 } else if (navigator.getBattery) {54 navigator.getBattery().then(readBattery)55 } else {56 document.querySelector('.not-support').removeAttribute('hidden')57 }58 window.onload = function () {59 if (battery) {60 battery.addEventListener('chargingchange', function () {61 readBattery()62 })63 battery.addEventListener('levelchange', function () {64 readBattery()65 })66 }67 }...

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battery-warn-cron.js

Source: battery-warn-cron.js Github

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...47 /​/​ TODO: HOW CAN WE KILL THE SUBPROCESS SPAWNED BY CVLC?48 /​/​ this.runMusic();49 },50 check: function() {51 const status = readBattery('status');52 if (/​Charging/​.test(readBattery('status'))) {53 this.ok();54 } else {55 const capacity = parseInt(readBattery('capacity'), 10);56 if (capacity < threshold.critical) {57 this.notify(this.critical);58 } else if (capacity < threshold.warn) {59 this.notify(this.warn);60 }61 }62 },63 run: function() {64 this.checkInterval = setInterval(() => this.check(), 1 * SECONDS);65 }66});...

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batteryInfo.js

Source: batteryInfo.js Github

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...67 function addListeners(battery) {89 battery.addEventListener("levelchange", function() {10 readBattery(battery);11 });1213 battery.addEventListener('chargingchange', function() {14 readBattery(battery);15 });1617 battery.addEventListener('chargingtimechange', function() {18 readBattery(battery);19 });2021 battery.addEventListener('dischargingtimechange', function() {22 readBattery(battery);23 });2425 readBattery(battery);2627 }28293031 function readBattery(battery) {3233 var batteryInfoEvent,34 detail = {};3536 if (typeof battery !== "undefined") {3738 if ( typeof battery.charging !== "undefined") {39 detail.batteryStatus = battery.charging ? 'Adapter' : 'Battery';40 }4142 if (typeof battery.level !== "undefined") {4344 if (battery.level == 1 && battery.charging) {45 /​* could be a device without battery plugged in, don't report the 100% level */​46 } else {47 detail.batteryLevel = parseFloat(battery.level * 100).toFixed(0) + '%';48 }4950 }51 }5253 batteryInfoEvent = new CustomEvent("__BatteryInfoEvent", {54 detail: detail,55 bubbles: true,56 cancelable: true57 });58 dispatchEvent(batteryInfoEvent);596061 return detail;6263 }646566 var init = function(event) {6768 if (typeof event !== "undefined") {69 if (typeof event.detail !== "undefined" && event.type == "__BatteryInfoEvent") {70 return event.detail;71 }72 }7374 };75767778 if (navigator.battery) {79 readBattery(navigator.battery);80 } else if (navigator.getBattery) {81 navigator.getBattery().then(addListeners);82 }838485 /​* public methods... */​86 return {87 init : init,88 defaultListeners : ["__BatteryInfoEvent","dischargingtimechange","chargingtimechange","chargingchange","levelchange"]89 };90 ...

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App.js

Source: App.js Github

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1import React from 'react';2import {3 BrowserRouter as Router,4 Switch,5 /​/​Route,6 Link7} from "react-router-dom";8import classes from './​App.module.css';9import Routes from './​Routes';10import PreloadComponents from './​PreloadComponents';11/​/​import Home from './​Home';12/​/​import LEScan from './​components/​LEScan';13/​/​import ReadBattery from './​components/​ReadBattery';14/​/​import WriteHeart from './​components/​WriteHeart';15/​/​import Notification from './​components/​Notification';16/​*17function Home() {18 return (19 <main className={classes.main}>20 <Link className={classes.link} to="/​scan"><button className={classes.button}>LE Scan for Advertisement</​button></​Link>21 <Link className={classes.link} to="/​notify"><button className={classes.button}>Read and Write Value using Notification</​button></​Link>22 <Link className={classes.link} to="/​battery"><button className={classes.button}>Read Battery Level from a Bluetooth Device</​button></​Link>23 <Link className={classes.link} to="/​heart"><button className={classes.button}>Write Value to a Bluetooth Device</​button></​Link>24 </​main>25 )26}27...28<Switch>29 <Route exact path='/​' component={Home} /​>30 <Route exact path='/​scan' component={LEScan} /​>31 <Route exact path='/​battery' component={ReadBattery} /​>32 <Route exact path='/​heart' component={WriteHeart} /​>33 <Route exact path='/​notify' component={Notification} /​>34 </​Switch>35*/​36function App() {37 38 return (39 <Router>40 <div className={classes.container}>41 <div className={classes.header}>42 <Link className={classes.toplink} to='/​'><h4 className={classes.title}>Web Bluetooth API Demo</​h4></​Link>43 </​div>44 <React.Suspense fallback={<span>Loading....</​span>}>45 <PreloadComponents /​>46 <Switch>47 <Routes /​>48 </​Switch>49 </​React.Suspense>50 </​div>51 </​Router>52 )53}...

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battery.js

Source: battery.js Github

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...48 clearTimeout(toId);49 $.Topic("startComicNav").unsubscribe( stopStuff );50 };51 $.Topic("startComicNav").subscribe( stopStuff );52 function readBattery(b) {53 battery = b || battery;54 55 var cid = $("#sizer").attr("comicid");56 if (cid === initialComicId) {57 /​/​ only do stuff if we're still on the same comic58 var percentage = parseFloat((battery.level * 100).toFixed(2));59 updateWithBatteryLevel(percentage);60 toId = setTimeout(readBattery, 30000);61 }62 }63 if (navigator.battery) {64 readBattery(navigator.battery);65 } else if (navigator.getBattery) {66 navigator.getBattery().then(readBattery);67 } else {68 /​/​ not supported. fake it!69 readBattery({70 level: Math.random()71 });72 }73 ...

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batteryMonitorSketch.js

Source: batteryMonitorSketch.js Github

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...9e', function(error, stdout, stderr) {});10/​/​ Enable this to put the system under significant stress!11/​/​ child = exec('stress -c 2 -i 2 -m 2 -d 2', function(error, stdout, stderr) {});12console.log("Reading I2C..");13function readBattery() {14 var d = i2c.readReg(0x2c);15 console.log("Result (CSOC %): " + d);16 var voltage = readInt16(0x09, 0x08);17 console.log('Reported Voltage High (mV): ' + voltage);18 console.log('Time to full (minutes): ' + readInt16(0x19, 0x18));19 console.log('Time to empty (minutes): ' + readInt16(0x17, 0x16));20 var temperature = readInt16(0x07, 0x06);21 temperature = (((temperature * .25) - 273.15) * 1.8) + 32;22 console.log('Temperature (F): ' + Math.round(temperature));23 var current = readInt16(0x15, 0x14);24 current = (current * 3.57) /​ 75;25 console.log('Current (mA): ' + current);26 console.log('Power consumption (W): ' + ((current /​ 1000) * (voltage /​ 1000)))27;28}29function readInt16(highReg, lowReg) {30 /​/​ from page 26 of the docs, this is the way to read 16 bit values.31 var high = i2c.readReg(highReg);32 var low = i2c.readReg(lowReg);33 var high2 = i2c.readReg(highReg);34 if( high2 !== high) {35 low = i2c.readReg(lowReg);36 high = high2;37 }38 return (high << 8) | low;39}40setInterval(readBattery, 1000);...

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Routes.js

Source: Routes.js Github

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1import React from "react";2import { Route, withRouter } from "react-router-dom";3const Home = React.lazy(() => import('./​Home'));4const LEScan = React.lazy(() => import('./​components/​LEScan'));5const ReadBattery = React.lazy(() => import('./​components/​ReadBattery'));6const WriteHeart = React.lazy(() => import('./​components/​WriteHeart'));7const Notification = React.lazy(() => import('./​components/​Notification'));8export const routes = [9 {10 component: Home,11 path: "/​"12 },13 {14 component: LEScan,15 path: "/​scan"16 },17 {18 component: ReadBattery,19 path: "/​battery"20 },21 {22 component: WriteHeart,23 path: "/​heart"24 },25 {26 component: Notification,27 path: "/​notify"28 }29]30const Routes = withRouter(({ location }) => {31 console.log(location);32 return (33 <React.Fragment>34 {35 routes.map(route => {36 return (37 <Route exact 38 key={route.path} 39 path={route.path} 40 component={route.component}41 /​>42 )43 })44 }45 </​React.Fragment>46 )47})...

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Using AI Code Generation

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1const { chromium } = require('playwright');2(async () => {3 const browser = await chromium.launch();4 const context = await browser.newContext();5 const page = await context.newPage();6 const client = await page.context().newCDPSession(page);7 const battery = await client.send('Power.readBattery');8 console.log(battery);9 await browser.close();10})();11{12}

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Using AI Code Generation

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1const { readBattery } = require('playwright-core/​lib/​server/​chromium/​crBrowser');2(async () => {3 const browser = await chromium.launch();4 const context = await browser.newContext();5 const page = await context.newPage();6 const battery = await readBattery(page);7 console.log(battery);8 await browser.close();9})();

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Using AI Code Generation

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1const { chromium } = require('playwright');2const { readBattery } = require('playwright/​lib/​server/​supplements/​recorder/​recorderSupplement');3(async () => {4 const browser = await chromium.launch();5 const context = await browser.newContext();6 const page = await context.newPage();7 const battery = await readBattery(page);8 console.log(battery);9 await browser.close();10})();11{12}

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Using AI Code Generation

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1const {readBattery} = require('playwright/​lib/​server/​chromium/​crBrowser');2const {chromium} = require('playwright');3(async () => {4 const browser = await chromium.launch();5 const context = await browser.newContext();6 const page = await context.newPage();7 const battery = await readBattery(page);8 console.log(battery);9 await browser.close();10})();11{charging: true, chargingTime: 0, dischargingTime: Infinity, level: 1}

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Using AI Code Generation

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1const {readBattery} = require('playwright/​lib/​server/​chromium/​crBrowser');2const chromium = require('playwright').chromium;3const browser = await chromium.launch();4const context = await browser.newContext();5const page = await context.newPage();6const battery = await readBattery(page);7console.log(battery);8const {readBattery} = require('playwright/​lib/​server/​chromium/​crBrowser');9const chromium = require('playwright').chromium;10const browser = await chromium.launch();11const context = await browser.newContext();12const page = await context.newPage();13const battery = await readBattery(page);14console.log(battery);15const {readBattery} = require('playwright/​lib/​server/​chromium/​crBrowser');16const chromium = require('playwright').chromium;17const browser = await chromium.launch();18const context = await browser.newContext();19const page = await context.newPage();20const battery = await readBattery(page);21console.log(battery);22const {readBattery} = require('playwright/​lib/​server/​chromium/​crBrowser');23const chromium = require('playwright').chromium;24const browser = await chromium.launch();25const context = await browser.newContext();26const page = await context.newPage();27const battery = await readBattery(page);28console.log(battery);29const {readBattery} = require('playwright/​lib/​server/​chromium/​crBrowser');30const chromium = require('playwright').chromium;31const browser = await chromium.launch();32const context = await browser.newContext();33const page = await context.newPage();34const battery = await readBattery(page);35console.log(battery);36const {readBattery} = require('playwright/​lib/​server/​chromium/​crBrowser');37const chromium = require('playwright').chromium;38const browser = await chromium.launch();39const context = await browser.newContext();40const page = await context.newPage();41const battery = await readBattery(page);42console.log(battery);43const {readBattery} = require('playwright/​lib/​server/​chromium/​crBrowser');44const chromium = require('playwright').chromium;

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Using AI Code Generation

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1const { readBattery } = require('playwright/​lib/​server/​deviceDescriptors');2const path = require('path');3(async () => {4 const battery = await readBattery(path.join(__dirname, 'battery.json'));5 console.log(battery);6})();7{8}9const { chromium } = require('playwright');10(async () => {11 const browser = await chromium.launch();12 const context = await browser.newContext({13 battery: {14 }15 });16 const page = await context.newPage();17 await browser.close();18})();19const { chromium } = require('playwright');20(async () => {21 const browser = await chromium.launch();22 const context = await browser.newContext({23 ...require('./​deviceDescriptor.json')24 });25 const page = await context.newPage();26 await browser.close();27})();

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Using AI Code Generation

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1const { readBattery } = require('playwright/​lib/​server/​supplements/​deviceDescriptors/​deviceDescriptors');2console.log(readBattery());3const { readBattery } = require('playwright/​lib/​server/​supplements/​deviceDescriptors/​deviceDescriptors');4console.log(readBattery());5const { readBattery } = require('playwright/​lib/​server/​supplements/​deviceDescriptors/​deviceDescriptors');6console.log(readBattery());7const { readBattery } = require('playwright/​lib/​server/​supplements/​deviceDescriptors/​deviceDescriptors');8console.log(readBattery());9const { readBattery } = require('playwright/​lib/​server/​supplements/​deviceDescriptors/​deviceDescriptors');10console.log(readBattery());11const { readBattery } = require('playwright/​lib/​server/​supplements/​deviceDescriptors/​deviceDescriptors');12console.log(readBattery());13const { readBattery } = require('playwright/​lib/​server/​supplements/​deviceDescriptors/​deviceDescriptors');14console.log(readBattery());15const { readBattery } = require('playwright/​lib/​server/​supplements/​deviceDescriptors/​deviceDescriptors');16console.log(readBattery());17const { readBattery } = require('playwright/​lib/​server/​supplements/​deviceDescriptors/​deviceDescriptors');18console.log(readBattery());19const { readBattery } = require('playwright/​lib/​server/​supplements/​deviceDescriptors/​deviceDescriptors');20console.log(readBattery());21const { readBattery } = require('playwright/​lib/​server/​supplements/​deviceDescriptors/​deviceDescriptors');22console.log(readBattery());23const { readBattery } = require('playwright/​lib/​server/​supplements/​deviceDescriptors/​deviceDescriptors');24console.log(readBattery());25const { readBattery } = require('playwright/​lib/​server/​supplements/​deviceDescriptors/​deviceDescriptors');26console.log(readBattery());27const { read

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Using AI Code Generation

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1const { readBattery } = require('playwright/​lib/​server/​ios/​iosDeviceDescriptors');2const battery = await readBattery();3console.log(battery);4const { readBattery } = require('playwright/​lib/​server/​ios/​iosDeviceDescriptors');5const battery = await readBattery();6console.log(battery);7const { readBattery } = require('playwright/​lib/​server/​ios/​iosDeviceDescriptors');8const battery = await readBattery();9console.log(battery);10const { readBattery } = require('playwright/​lib/​server/​ios/​iosDeviceDescriptors');11const battery = await readBattery();12console.log(battery);13const { readBattery } = require('playwright/​lib/​server/​ios/​iosDeviceDescriptors');14const battery = await readBattery();15console.log(battery);16const { readBattery } = require('playwright/​lib/​server/​ios/​iosDeviceDescriptors');17const battery = await readBattery();18console.log(battery);19const { readBattery } = require('playwright/​lib/​server/​ios/​iosDeviceDescriptors');20const battery = await readBattery();21console.log(battery);22const { readBattery } = require('playwright/​lib/​server/​ios/​iosDeviceDescriptors');23const battery = await readBattery();24console.log(battery);

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StackOverFlow community discussions

Questions
Discussion

Jest + Playwright - Test callbacks of event-based DOM library

firefox browser does not start in playwright

Is it possible to get the selector from a locator object in playwright?

How to run a list of test suites in a single file concurrently in jest?

Running Playwright in Azure Function

firefox browser does not start in playwright

This question is quite close to a "need more focus" question. But let's try to give it some focus:

Does Playwright has access to the cPicker object on the page? Does it has access to the window object?

Yes, you can access both cPicker and the window object inside an evaluate call.

Should I trigger the events from the HTML file itself, and in the callbacks, print in the DOM the result, in some dummy-element, and then infer from that dummy element text that the callbacks fired?

Exactly, or you can assign values to a javascript variable:

const cPicker = new ColorPicker({
  onClickOutside(e){
  },
  onInput(color){
    window['color'] = color;
  },
  onChange(color){
    window['result'] = color;
  }
})

And then

it('Should call all callbacks with correct arguments', async() => {
    await page.goto(`http://localhost:5000/tests/visual/basic.html`, {waitUntil:'load'})

    // Wait until the next frame
    await page.evaluate(() => new Promise(requestAnimationFrame))

    // Act
   
    // Assert
    const result = await page.evaluate(() => window['color']);
    // Check the value
})
https://stackoverflow.com/questions/65477895/jest-playwright-test-callbacks-of-event-based-dom-library

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