CODE EXAMPLE FOR JAVASCRIPT

javascript channel flutter inappWebview

// execute inside the "flutterInAppWebViewPlatformReady" event listener
window.addEventListener("flutterInAppWebViewPlatformReady", function(event) {
 const args = [1, true, ['bar', 5], {foo: 'baz'}];
 window.flutter_inappwebview.callHandler('myHandlerName', ...args);
});

// or using a global flag variable
var isFlutterInAppWebViewReady = false;
window.addEventListener("flutterInAppWebViewPlatformReady", function(event) {
 isFlutterInAppWebViewReady = true;
});
// then, somewhere in your code
if (isFlutterInAppWebViewReady) {
 const args = [1, true, ['bar', 5], {foo: 'baz'}];
 window.flutter_inappwebview.callHandler('myHandlerName', ...args);
}