How to use accessibility - 10 common examples
To help you get started, we’ve selected a few accessibility examples, based on popular ways it is used in public projects.
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mozilla-b2g / gaia / tv_apps / smart-system / js / accessibility.js View on Github 
if (aValue) {
SettingsListener.getSettingsLock().set({
'accessibility.screenreader-show-settings': true
});
}
this.screen.classList.toggle('screenreader', aValue);
break;
case 'accessibility.colors.enable':
SettingsListener.getSettingsLock().set({
'layers.effect.invert': aValue ?
this.settings['accessibility.colors.invert'] : false,
'layers.effect.grayscale': aValue ?
this.settings['accessibility.colors.grayscale'] : false,
'layers.effect.contrast': aValue ?
this.settings['accessibility.colors.contrast'] : '0.0'
});
break;
case 'accessibility.screenreader-captions':
this.speechSynthesizer.captions = aValue;
// If captions are displayed hide them.
if (!aValue) {
this.speechSynthesizer.hideSpeech(true);
}
break;
case 'accessibility.colors.invert':
case 'accessibility.colors.grayscale':
case 'accessibility.colors.contrast':
if (this.settings['accessibility.colors.enable']) {
var effect = settingKey.split('.').pop();this.CONTRAST_CAP : '0.0'
});
break;
case 'accessibility.screenreader-captions':
this.speechSynthesizer.captions = aValue;
// If captions are displayed hide them.
if (!aValue) {
this.speechSynthesizer.hideSpeech(true);
}
break;
case 'accessibility.colors.invert':
case 'accessibility.colors.grayscale':
case 'accessibility.colors.contrast':
if (this.settings['accessibility.colors.enable']) {
var effect = settingKey.split('.').pop();
var gfxSetting = {};
if (effect === 'contrast') {
gfxSetting['layers.effect.contrast'] =
aValue * this.CONTRAST_CAP;
} else {
gfxSetting['layers.effect.' + effect] = aValue;
}
SettingsListener.getSettingsLock().set(gfxSetting);
}
break;
}
}.bind(this));
}, this);this.settings['accessibility.colors.contrast'] : '0.0'
});
break;
case 'accessibility.screenreader-captions':
this.speechSynthesizer.captions = aValue;
// If captions are displayed hide them.
if (!aValue) {
this.speechSynthesizer.hideSpeech(true);
}
break;
case 'accessibility.colors.invert':
case 'accessibility.colors.grayscale':
case 'accessibility.colors.contrast':
if (this.settings['accessibility.colors.enable']) {
var effect = settingKey.split('.').pop();
var gfxSetting = {};
if (effect === 'contrast') {
gfxSetting['layers.effect.contrast'] =
aValue * this.CONTRAST_CAP;
} else {
gfxSetting['layers.effect.' + effect] = aValue;
}
SettingsListener.getSettingsLock().set(gfxSetting);
}
break;
}
}.bind(this));
}, this);if (aValue) {
SettingsListener.getSettingsLock().set({
'accessibility.screenreader-show-settings': true
});
}
this.screen.classList.toggle('screenreader', aValue);
break;
case 'accessibility.colors.enable':
SettingsListener.getSettingsLock().set({
'layers.effect.invert': aValue ?
this.settings['accessibility.colors.invert'] : false,
'layers.effect.grayscale': aValue ?
this.settings['accessibility.colors.grayscale'] : false,
'layers.effect.contrast': aValue ?
this.settings['accessibility.colors.contrast'] *
this.CONTRAST_CAP : '0.0'
});
break;
case 'accessibility.screenreader-captions':
this.speechSynthesizer.captions = aValue;
// If captions are displayed hide them.
if (!aValue) {
this.speechSynthesizer.hideSpeech(true);
}
break;
case 'accessibility.colors.invert':
case 'accessibility.colors.grayscale':
case 'accessibility.colors.contrast':
if (this.settings['accessibility.colors.enable']) {case 'accessibility.screenreader':
// Show Accessibility panel if it is not already visible
if (aValue) {
SettingsListener.getSettingsLock().set({
'accessibility.screenreader-show-settings': true
});
}
this.screen.classList.toggle('screenreader', aValue);
break;
case 'accessibility.colors.enable':
SettingsListener.getSettingsLock().set({
'layers.effect.invert': aValue ?
this.settings['accessibility.colors.invert'] : false,
'layers.effect.grayscale': aValue ?
this.settings['accessibility.colors.grayscale'] : false,
'layers.effect.contrast': aValue ?
this.settings['accessibility.colors.contrast'] *
this.CONTRAST_CAP : '0.0'
});
break;
case 'accessibility.screenreader-captions':
this.speechSynthesizer.captions = aValue;
// If captions are displayed hide them.
if (!aValue) {
this.speechSynthesizer.hideSpeech(true);
}
break;
case 'accessibility.colors.invert':
case 'accessibility.colors.grayscale':case 'accessibility.screenreader':
// Show Accessibility panel if it is not already visible
if (aValue) {
SettingsListener.getSettingsLock().set({
'accessibility.screenreader-show-settings': true
});
}
this.screen.classList.toggle('screenreader', aValue);
break;
case 'accessibility.colors.enable':
SettingsListener.getSettingsLock().set({
'layers.effect.invert': aValue ?
this.settings['accessibility.colors.invert'] : false,
'layers.effect.grayscale': aValue ?
this.settings['accessibility.colors.grayscale'] : false,
'layers.effect.contrast': aValue ?
this.settings['accessibility.colors.contrast'] : '0.0'
});
break;
case 'accessibility.screenreader-captions':
this.speechSynthesizer.captions = aValue;
// If captions are displayed hide them.
if (!aValue) {
this.speechSynthesizer.hideSpeech(true);
}
break;
case 'accessibility.colors.invert':
case 'accessibility.colors.grayscale':
case 'accessibility.colors.contrast':this.settings[settingKey] = aValue;
switch (settingKey) {
case 'accessibility.screenreader':
// Show Accessibility panel if it is not already visible
if (aValue) {
SettingsListener.getSettingsLock().set({
'accessibility.screenreader-show-settings': true
});
}
this.screen.classList.toggle('screenreader', aValue);
break;
case 'accessibility.colors.enable':
SettingsListener.getSettingsLock().set({
'layers.effect.invert': aValue ?
this.settings['accessibility.colors.invert'] : false,
'layers.effect.grayscale': aValue ?
this.settings['accessibility.colors.grayscale'] : false,
'layers.effect.contrast': aValue ?
this.settings['accessibility.colors.contrast'] : '0.0'
});
break;
case 'accessibility.screenreader-captions':
this.speechSynthesizer.captions = aValue;
// If captions are displayed hide them.
if (!aValue) {
this.speechSynthesizer.hideSpeech(true);
}
break;
case 'accessibility.colors.invert':this.settings[settingKey] = aValue;
switch (settingKey) {
case 'accessibility.screenreader':
// Show Accessibility panel if it is not already visible
if (aValue) {
SettingsListener.getSettingsLock().set({
'accessibility.screenreader-show-settings': true
});
}
this.screen.classList.toggle('screenreader', aValue);
break;
case 'accessibility.colors.enable':
SettingsListener.getSettingsLock().set({
'layers.effect.invert': aValue ?
this.settings['accessibility.colors.invert'] : false,
'layers.effect.grayscale': aValue ?
this.settings['accessibility.colors.grayscale'] : false,
'layers.effect.contrast': aValue ?
this.settings['accessibility.colors.contrast'] *
this.CONTRAST_CAP : '0.0'
});
break;
case 'accessibility.screenreader-captions':
this.speechSynthesizer.captions = aValue;
// If captions are displayed hide them.
if (!aValue) {
this.speechSynthesizer.hideSpeech(true);
}
break;announceScreenReader: function ar_announceScreenReader() {
var enabled = this.settings['accessibility.screenreader'];
this.isSpeaking = true;
return this.speak({
string: enabled ? 'disableScreenReaderSteps' : 'enableScreenReaderSteps'
}, {enqueue: false});
},this.reset();
if (!this.isSpeaking && timeStamp > this.expectedCompleteTimeStamp) {
this.cancelSpeech();
this.announceScreenReader(function onEnd() {
this.resetSpeaking(timeStamp + this.REPEAT_BUTTON_PRESS);
}.bind(this));
return;
}
this.cancelSpeech();
this.resetSpeaking();
SettingsListener.getSettingsLock().set({
'accessibility.screenreader':
!this.settings['accessibility.screenreader']
});
},
