touchend event doesn't work on Android
I've just started looking at doing some basic mobile web development on the android and an writing a test script to investigate the touch events. I've run the following code in the android emulator, and the touchend event never gets fired. Can anyone tell me why ?
I've tried in three versions of the emulator (1.6, 2.1 and 2.2) and all three behave in the same way.
Thanks in advance for any help you can give me.
Cheers, Colm
EDIT - I've also tried this using the XUI framework and have the same problem so I'm guessing I have a fundamental misunderstanding of how this stuff works ......
Map Test
<meta name="description" content="" />
<meta name="keywords" content="" />
<meta name="language" content="english" />
<meta name="viewport" content="minimum-scale=1.0,
width=device-width,
height=device-height,
user-scalable=no">
<script type="text/javascript">
window.onload = function(){
document.body.appendChild(
document.createTextNode("w: " + screen.width + " x " + "h : " +screen.height)
);
attachTouchEvents();
}
function attachTouchEvents() {
console = document.getElementById("console");
var map = document.getElementById("map");
map.addEventListener ('touchstart', function (event) {
event.preventDefault();
var touch = event.touches[0];
document.getElementById("touchCoord").innerHTML = "S : " + touch.pageX + " " + touch.pageY;
document.getElementById("touchEvent").innerHTML = "Touch Start";
}, false);
map.addEventListener ('touchmove', function (event) {
event.preventDefault();
var touch = event.touches[0];
document.getElementById("touchCoord").innerHTML = "M : " + touch.pageX + " " + touch.pageY;
document.getElementById("touchEvent").innerHTML = "Touch Move";
}, false);
map.addEventListener ('touchend', function (event) {
var touch = event.touches[0];
document.getElementById("touchCoord").innerHTML = "E : " + touch.pageX + " " + touch.pageY;
document.getElementById("touchEvent").innerHTML = "Touch End";
event.preventDefault();
}, false);
console.innerHTML = "event attached";
}
</script>
<style type="text/css">
html, body {
height:100%;
width:100%;
margin: 0;
background-color:red;
}
#map {
height: 300px;
width: 300px;
background-color:yellow;
}
</style>
</head>
<body>
<div id="map"></div>
<div id="touchCoord">Touch Coords</div>
<div id="touchEvent">Touch Evnt</div>
<div id="console">Console</div>
</body>
Answer
For anyone trying to figure out why touchend events are missing on Android v3 and v4 (maybe also v2.3), there is a long outstanding bug which only just got fixed in v4.1 (apparently):
http://code.google.com/p/android/issues/detail?id=4549
http://code.google.com/p/android/issues/detail?id=19827
To workaround this bug you have to call preventDefault() on either the touchstart or first touchmove event. Of course, this prevents the native scrolling, so you will need to re-implement that yourself.