JavaScript for Mobile - Learn HTML5 and JavaScript for Android - page 192

this.play = function(){
track.play();
};
this.stop = function(){
track.pause();
};
}
As you can see, there is a method called this.togglePlay . The toggle play
method will check the track's state. If it is stopped or paused, it will trigger the
play method; if it is playing, it will trigger the stop method. These conditions are
wrapped within a switch statement. The switch statement is a good alternative
to using if statements to reduce clutter. The statement is formed of the
following:
switch(value){
case condition:
/** condition code **/
break;
case condition:
/** condition code **/
break;
default:
/** default code **/
break;
}
As you can see, it takes a value . Each case represents a condition to compare
the value to. If the condition matches, it executes the code within the case and
then breaks out of the switch . If none of the condition s match, you can specify
a default action to take using default :. It's best practice to only compare integer
values in a switch statement.
With the togglePlay method complete, the this.play and this.stop methods
both act as wrappers to pause or play the track.
The full code for the track is as follows:
app.track = function(length){
this.state = {
STOPPED: 0,
PLAYING: 1,
PAUSED: 2
};