This is Dart verion of my previous post
JavaScript Keyboard Event (Arrow Key Example) .
Demo (view with Dartium)
Source Code for Demo (HTML):
arrow-key.html |
repository |
view raw
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25 | <!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Dart Arrow Key Event Example</title>
</head>
<body>
Press Any Key:<br>
<textarea id="info" rows="20" cols="80"></textarea>
<script type='text/javascript'>
var script = document.createElement('script');
if (navigator.userAgent.indexOf('(Dart)') === -1) {
// Browser doesn't support Dart
script.setAttribute("type","text/javascript");
script.setAttribute("src", "arrow-key.js");
} else {
script.setAttribute("type","application/dart");
script.setAttribute("src", "arrow-key.dart");
}
document.getElementsByTagName("head")[0].appendChild(script);
</script>
</body>
</html>
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Source Code for Demo (Dart):
arrow-key.dart |
repository |
view raw
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32 | import 'dart:html';
void arrowKeystrokes(Event e) {
if(e is KeyboardEvent) {
KeyboardEvent kevt = e as KeyboardEvent;
switch(kevt.keyCode) {
case KeyCode.LEFT:
querySelector("#info").appendHtml("LEFT ");
break;
case KeyCode.UP:
querySelector("#info").appendHtml("UP ");
break;
case KeyCode.DOWN:
querySelector("#info").appendHtml("DOWN ");
break;
case KeyCode.RIGHT:
querySelector("#info").appendHtml("RIGHT ");
break;
default:
querySelector("#info").appendHtml("SOMEKEY ");
}
}
}
void main() {
window.onKeyUp.listen(arrowKeystrokes);
}
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References: