The follwing code initializes the barcode reader Call one time at application startup

navigator.aidc.init(function () {
	console.log("Reader initialized");
	navigator.aidc.claim(function () {
		console.log("Reader claimed");
	}, function (err) { console.log(err); }); 
}, function (err) { console.log(err); });

To register a callback for barcode reads navigator.aidc.register(function (event) { if(event.success) { console.log(event.data); } else { // scan button pressed, no barcode read } });

This callback is called both when a barcode is read, and when it's not read.
Check the event.success field.

Each call to the navigator.aidc.register will replace the current callback

To unregister the current callback navigator.aidc.unregister();

To enable the trigger button navigator.aidc.enableTrigger();

The trigger button is enable by default

To disable the trigger button navigator.aidc.disableTrigger();

In the apps pause event call this navigator.aidc.release(function () { console.log("Reader released"); }, function (err) { console.log(err); });

In the apps resume event call this navigator.aidc.claim(function () { console.log("Reader claimed"); }, function (err) { console.log(err); });