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What should I use instead of navigator.getBattery(), as it is not working?

I am working on a chrome extension and with this what I want to do is -

function toggleBatterySaver(enable) {
  if (enable) {
      navigator.getBattery().then(battery => {
          if (battery.level < 0.2) {
              chrome.power.requestKeepAwake("system");
          }
      });
  } else {
      chrome.power.releaseKeepAwake();
  }
}

It is throwing an error: navigator.getBattery() is not a function.

What should I use instead of navigator.getBattery(), as it is not working?

I am working on a chrome extension and with this what I want to do is -

function toggleBatterySaver(enable) {
  if (enable) {
      navigator.getBattery().then(battery => {
          if (battery.level < 0.2) {
              chrome.power.requestKeepAwake("system");
          }
      });
  } else {
      chrome.power.releaseKeepAwake();
  }
}

It is throwing an error: navigator.getBattery() is not a function.

  • javascript
  • google-chrome-extension
  • batterymanager
Share Improve this question asked Nov 17, 2024 at 12:50 baranwalayushbaranwalayush 11 bronze badge 3
  • 1 Did you check the discussions here: stackoverflow/a/78105247/18667225 ? – Markus Commented Nov 17, 2024 at 13:22
  • Yes, I did and that didn't help me. My code is correct to best of my knowledge and my chrome browser is also updated. – baranwalayush Commented Nov 17, 2024 at 18:19
  • That's really odd. I just implemented a small chrome plugin (using chrome 131.0.6778.70) and it is able to access navigator.battery() and print out the current battery level. It seems, we need more debugging information from your side. I will post my minimal, (hopefully) reproducible example and would like to ask you to test it and share your observations. – Markus Commented Nov 17, 2024 at 20:47
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1 Answer 1

Reset to default 0

You can try to start with a minimal chrome extension that uses navigator.battery():

index.html:

<!DOCTYPE html>
<html>
<head><title>Battery Test</title></head>
<body><div id="bat">-</div></body>
<script src="script.js"></script>
</html>

script.js:

navigator.getBattery().then(battery => {
  document.getElementById("bat").innerHTML = "Battery: " + battery.level;
});

manifest.json:

{
    "name": "Battery Test",
    "version": "1.0.0",
    "description": "Battery Test",
    "manifest_version": 3,
    "author": "Markus",
    "action":{
        "default_popup": "index.html",
        "default_title": "Battery Test"
    }
}

Edit

In a service worker context the navigator object is of type WorkerNavigator that is missing the battery property among others. One way to get around this is to open an offscreen document.

manifest.json (set permission "offscreen"):

{
  "name": "Battery Test",
  "version": "1.0.0",
  "description": "Battery Test",
  "manifest_version": 3,
  "action":{
    "default_title": "Battery Test"
  },
  "background": {
    "service_worker": "background.js"
  },
  "permissions": ["offscreen"]
}

background.js (create the offscreen document "offscree.html"):

chrome.runtime.onInstalled.addListener(() => {
  chrome.offscreen.createDocument({
    url: 'offscreen.html',
    reasons: ['BATTERY_STATUS'],
    justification: 'read battery status'
  });
});

offscreen.html (runs your script):

<!DOCTYPE html>
<script src="script.js"></script>

script.js:

navigator.getBattery().then(battery => {
  console.log("Battery: " + battery.level);
});

If you need the battery status in the background process itself you can find features to send messages from the offscreen page to your worker and vice versa in the documention linked above.

本文标签： javascriptAlternative for navigatorgetBattery() of battery apiStack Overflow

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