How to add an event listener with a callback function that accepts attributes?
And also, how to remov开发者_如何学编程e it then?
// we're in some internal scope here
var x = 10;
var fn = function( e ) {
wrappedFunction( e, x );
}
//add
o.addEventListener( 'click', fn, false );
// create remover
var remover = function() {
o.removeEventListener( 'click', fn, false );
}
//save the remover for later or return it - when it's called from whatever scope the event is removed
remover();
When you say "attributes", do you mean arguments/parameters?
If so, you can dynamically assign an event handler that does accept arguments. In the example below, the argument testValue is passed to the dynamically assigned event handler:
<html>
<head>
<title>Test</title>
</head>
<body>
<input id="testInput" type="text"/>
<script type="text/javascript">
var testValue = "Success.";
document.getElementById("testInput").onkeydown = function() {
test(testValue); }
function test(testValue) {
alert(testValue);
}
</script>
</body>
</html>
To remove the event handler, you can assign it to null:
document.getElementById("testInput").onkeydown = null;
加载中,请稍侯......
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