Javascript onHover event

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Is there a canonical way to set up a JS onHover event with the existing onmouseover, onmouseout and some kind of timers? Or just any method to fire an arbitrary function if

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4条回答

灰色年华

2020-11-29 03:30

How about something like this?

<html>
<head>
<script type="text/javascript">

var HoverListener = {
  addElem: function( elem, callback, delay )
  {
    if ( delay === undefined )
    {
      delay = 1000;
    }

    var hoverTimer;

    addEvent( elem, 'mouseover', function()
    {
      hoverTimer = setTimeout( callback, delay );
    } );

    addEvent( elem, 'mouseout', function()
    {
      clearTimeout( hoverTimer );
    } );
  }
}

function tester()
{
  alert( 'hi' );
}

//  Generic event abstractor
function addEvent( obj, evt, fn )
{
  if ( 'undefined' != typeof obj.addEventListener )
  {
    obj.addEventListener( evt, fn, false );
  }
  else if ( 'undefined' != typeof obj.attachEvent )
  {
    obj.attachEvent( "on" + evt, fn );
  }
}

addEvent( window, 'load', function()
{
  HoverListener.addElem(
      document.getElementById( 'test' )
    , tester 
  );
  HoverListener.addElem(
      document.getElementById( 'test2' )
    , function()
      {
        alert( 'Hello World!' );
      }
    , 2300
  );
} );

</script>
</head>
<body>
<div id="test">Will alert "hi" on hover after one second</div>
<div id="test2">Will alert "Hello World!" on hover 2.3 seconds</div>
</body>
</html>

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有刺的猬

2020-11-29 03:32
I don't think you need/want the timeout.

onhover (hover) would be defined as the time period while "over" something. IMHO
```
onmouseover = start...

onmouseout = ...end
```
For the record I've done some stuff with this to "fake" the hover event in IE6. It was rather expensive and in the end I ditched it in favor of performance.
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终归单人心

2020-11-29 03:33
Can you clarify your question? What is "ohHover" in this case and how does it correspond to a delay in hover time?

That said, I think what you probably want is...
```
var timeout;
element.onmouseover = function(e) {
    timeout = setTimeout(function() {
        // ...
    }, delayTimeMs)
};
element.onmouseout = function(e) {
    if(timeout) {
        clearTimeout(timeout);
    }
};
```
Or addEventListener/attachEvent or your favorite library's event abstraction method.
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情话喂你

2020-11-29 03:38
If you use the JQuery library you can use the .hover() event which merges the mouseover and mouseout event and helps you with the timing and child elements:
```
$(this).hover(function(){},function(){});
```
The first function is the start of the hover and the next is the end. Read more at: http://docs.jquery.com/Events/hover
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