<html>
<head>
<title>CapsLock Demo</title>
<script src="http://ajax.googleapis.com/ajax/libs/mootools/1.2.4/mootools-yui-compressed.js" type="text/javascript" charset="utf-8"></script>
<script src="./CapsLock.js?ver=1.0" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript">
window.addEvent('domready', function() {
var pass = document.id('pa*snotice'),
user = document.id('usercapsnotice'); function pa*sOn() { pass.setStyle('display', 'block'); }
function pa*sOff() { pass.setStyle('display', 'none'); } function userCapsOn() { user.setStyle('display', 'block'); }
function userCapsOff() { user.setStyle('display', 'none'); } document.id('username').addEvents({
'capsLockOn': userCapsOn,
'capsLockOff': userCapsOff,
'blur': userCapsOff,
'focus': function(event) {
if (event.hasCapsLock()) { userCapsOn(); }
}
}); document.id('password').addEvents({
'capsLockOn': pa*sOn,
'capsLockOff': pa*sOff,
'blur': pa*sOff,
'focus': function(event) {
if (event.hasCapsLock()) { pa*sOn(); }
}
}); });
</script>
<style type="text/css">
form {
width: 500px;
margin: 0 auto;
}
.label { width: 60px; }
.field { width: 260px; }
.notice {
display: none;
line-height: 2em;
margin-top: .5em;
padding: 0;
}
</style>
</head> <body>
<form>
<fieldset>
<legend>Login</legend>
<table>
<tbody>
<tr>
<td class="label"><label for="username">Username:</label></td>
<td class="field"><input type="text" id="username" name="username" class="title" /></td>
<td><span id="usercapsnotice" class="notice">Caps On.</span></td>
</tr>
<tr>
<td class="label"><label for="password">Password:</label></td>
<td class="field"><input type="password" id="password" name="password" class="title" /></td>
<td><span id="pa*snotice" class="notice">Caps On.</span></td>
</tr>
</tbody>
</table>
</fieldset>
</form>
</body>
</html>
其中：
(function() {
Browser.CapsLock = null;
var capsOn = null,
target = (Browser.Engine.trident) ? document : window;
/**
* Figure out if caps lock is on by checking for a lower case letter with shift
* pressed or an uppercase letter without shift. Once we know if it is on/off,
* remove the event listener.
*/
function checkCapsKey(event) {
if (event.code > 64 && event.code < 91) { // Capital Letters
Browser.CapsLock = capsOn = (event.shift) ? null : true;
} else if (event.code > 96 && event.code < 123) { // Lower-case Letters
Browser.CapsLock = capsOn = (event.shift) ? true : false;
}
if (capsOn !== null) {
target.removeEvent('keypress', checkCapsKey);
}
}
/**
* If user moves away from the window, we can't tell what happened with the caps
* key when he returns so we reset the caps checker.
*/
window.addEvent('blur', function(event) {
Browser.CapsLock = capsOn = null;
target.addEvent('keypress', checkCapsKey);
});
/**
* Checks an event for caps lock key presses. If it's Safari 3+, keyup means caps lock
* is off and keydown means caps lock is on. Otherwise just toggle the value of capsOn.
*/
function checkCapsPress(event) {
if (event.code == 20 && capsOn !== null) {
if (Browser.Engine.webkit && Browser.Engine.version > 420) {
Browser.CapsLock = capsOn = (event.event.type == 'keydown');
} else {
if (event.event.type == 'keydown') {
Browser.CapsLock = capsOn = !capsOn;
}
}
}
}
/**
* Add events to the target to monitor for caps lock key presses and to do
* the initial caps lock key sniffing.
*/
target.addEvents({
'keyup': checkCapsPress,
'keydown': checkCapsPress,
'keypress': checkCapsKey
});
Event.implement({ hasCapsLock: function(event) { return capsOn; } });
Element.Events.capsLockOn = {
base: 'keydown',
condition: function(event) {
if (event.code == 20) {
if (Browser.Engine.webkit && Browser.Engine.version > 420) {
return true;
} else if (capsOn !== null) {
return !capsOn;
}
} else if (capsOn !== null) {
return event.hasCapsLock();
}
}
};
Element.Events.capsLockOff = {
base: (Browser.Engine.webkit) ? 'keyup' : 'keydown',
condition: function(event) {
if (event.code == 20) {
if (Browser.Engine.webkit && Browser.Engine.version > 420) {
return true;
} else if (capsOn !== null) {
return (capsOn === true);
}
} else if (capsOn !== null) {
return !event.hasCapsLock();
}
}
};
})();