documentaddEventListenerdeviceready

Document addEventListener('deviceready') refers to a common Cordova/PhoneGap pattern used to detect when the Cordova framework has finished loading and the device APIs are available. The deviceready event signals that the native-side plugins and interfaces are ready to be used from JavaScript. This event is crucial for initializing code that relies on Cordova plugins, since attempting to call native features before deviceready may result in errors or undefined behavior.

To listen for the event, a typical approach is to add a listener like: document.addEventListener('deviceready', onDeviceReady, false); the onDeviceReady function contains code that uses Cordova plugins or other device APIs. It is common to place this listener early in page initialization and to include the Cordova script (cordova.js) in the page, as this script exposes the device APIs.

The deviceready event is fired once after the Cordova environment is fully initialized. It does not fire again on resume or other lifecycle events; separate events such as pause and resume handle those states. In a standard web browser, the deviceready event does not occur, because Cordova’s runtime is not present.

Example: document.addEventListener('deviceready', onDeviceReady, false); function onDeviceReady() { console.log('Device is ready'); // safe to use Cordova plugins here }

Best practices include placing plugin calls inside the deviceready handler and avoiding assumptions about device APIs being available before that event.