Lesson 10: JavaScript Coding for the Touch Interface, Device and Operating System Resources, and More

Front

For which gesture do you press a finger on the screen, move it in any direction, and then lift the finger to scroll?

Back

flick

Front

Which gesture is the equivalent of scrolling with a mouse?

Back

panning with inertia

Front

On a touch screen, lifting your finger from the screen triggers which JavaScript event?

Back

touchend

Front

On a touch screen device, which event is triggered when the device launches another application?

Back

touchcancel

Front

On a touch screen, which event do you trigger when you place two fingers on the screen?

Back

gesturestart

Front

The action an application takes in response to a gesture is called a_______?

Back

touch event

Front

Which JavaScript seldom-used touch event can reset variables used during other touch events, and helps the browser keep track of active touch objects in the touchlist?

Back

touchcancel

Front

What does the following code snippet result in?
var worker = new Worker("doWork.js");
worker.postMessage("start");

Back

creates a new Web Worker thread and starts it

Front

You are creating a script that works with WebSocket connections. What does the following code accomplish?
var file =
document.querySelector('input[type="file"]').files[0];
socket.send(file);

Back

sends a file as a Blob

Front

You are creating an application that will access raw binary data from local storage. Which File API interface is best to use?

Back

Blob