Use objects method as callback
I've got another JavaScript/jQuery-Problem. A minimal example could be this: I've got a div, and want some JavaScript executed, when the mouse enters. But for some reasons (= in reality, there a many divs, and for each data needs to be kept) I want to use a object as handler for the callback. Here's a small example:
function handler($thediv)
{
this.somedata = 8;
$thediv.mouseenter(function() { this.callback(); });
}
handler.prototype.callback = function()
{
alert(somedata);
}
An object is created when the document is loaded:
$(document).ready( function() {
new handler($("div"));
});
Nothing happens - except that the constructor is executed. I've tried and searched for hours now, but I can't fix this... probably too trivial?
Edit: A complete example.
<html>
<script type="text/javascript" src="jquery-1.6.js&quo开发者_高级运维t;></script>
</head>
<body>
<div>
blah blahasdasdadsssssssssssssss
asddddddddddddddddddddddddddd
</div>
</body>
<script type="text/javascript">
$(document).ready(function() {
new handler($("div"));
});
function handler($thediv)
{
this.somedata = 8;
$thediv.mouseenter(this.callback);
}
handler.prototype.callback = function()
{
alert(somedata);
}
</script>
</html>
The biggest issue here is the use of this in various contexts. Within the mouseenter function, this refers to div, not the object.
This should work:
http://jsfiddle.net/Nx5c7/
function handler($thediv)
{
this.somedata = 8;
this.theID=$thediv.attr("id");
var obj=this;
$thediv.mouseenter(function() {
obj.callback();
});
}
handler.prototype.callback = function()
{
alert(this.theID + " : " + this.somedata);
}
加载中,请稍侯......
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