jsbasic/bell.js

56 lines
1.7 KiB
JavaScript

//
// Applesoft BASIC in Javascript
// Bell - play an audio file for the CHR$(7) "BEL" beep
//
// Copyright (C) 2009-2011 Joshua Bell
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
var Bell;
if (typeof Bell !== 'function') {
Bell = function(base) {
var tag;
// Prefer HTML5 audio
tag = document.createElement('audio');
if (typeof tag.canPlayType === 'function') {
tag.setAttribute('preload', 'true');
if (tag.canPlayType('audio/mp3')) {
tag.setAttribute('src', base + 'bell.mp3');
} else if (tag.canPlayType('audio/ogg')) {
tag.setAttribute('src', base + 'bell.ogg');
} else if (tag.canPlayType('audio/wav')) {
tag.setAttribute('src', base + 'bell.wav');
}
this.play = function() { tag.play(); };
this.stop = function() { tag.pause(); tag.currentTime = 0; };
return;
}
// Fallback for IE<9
tag = document.createElement('bgsound');
if ('loop' in tag) {
tag.src = base + 'bell.wav';
tag.loop = 1;
this.play = function() { document.body.appendChild(tag); };
this.stop = function() { document.body.removeChild(tag); };
return;
}
this.play = function() { };
this.stop = function() { };
};
}