问题

$(".block li").hover(
    function(){
        $(this).animate({backgroundColor: "#000"});
    },
    function(){
        $(this).animate({backgroundColor: "#fff"});
    }
);

Need to change #fff to no color. Animation should occur from #000 to transparent.

Any solution?

回答1:

~~Instead of changing background color, remove that attribute!~~

The code is as simple as:

$("li").hover(
    function(){
        $(this).toggleClass('hover', 1000);
    },
    function(){
        $(this).toggleClass('hover', 2000);
    }
);

Example: http://jsfiddle.net/rdWTE/

For it to work, you need jQuery and jQuery UI. Does exactly what you wanted (except the colors)!

Those numbers in jQuery script stand for animation duration in milliseconds.

EDIT:

Uhm... Found out that toggleClass can bug from time to time. Better to use addClass on hover, and removeClass on mouse out.

回答2:

You could use rgba(...) (see browser support here).

var elem = $('#foo')[0];

$({
    r: 0,
    g: 0,
    b: 0,
    a: 1
}).animate({
    a: 0
}, {
    step: function() {
        elem.style.backgroundColor =
            'rgba(' +
                ~~this.r + ',' + ~~this.g + ',' + ~~this.b + ',' +
                ~~(this.a*100)/100 +
            ')';
    },
    duration: 1000
});

~~ is to floor values, otherwise you'll end up with stuff like rgba(0.1029302....

回答3:

Edit: I have tested this and it works.

Create two classes. One with background: #000 and one with background: transparent;

Animate the toggleClass or removeClass for the #000 background class.

example:

jQuery('.block li').hover(function() {
  $(this).toggleClass('blackClass', 'fast' );
}

CSS:

.blackClass { background: #000; }

回答4:

This might work. It prepends a new div with a background color onMouseOver, then it fades out and removes the div onMouseOut.

Example.

Example with list items over an image.

Good luck, hope this helps.

回答5:

Why not use the opacity CSS3 tag?

回答6:

I think you need to use the color plugin.

回答7:

This may require some change to your HTML and CSS (which could be effected by script if you don't have direct HTML/CSS control).

I would split each '.block li' element into two elements: one that will be the background element that can be animated with $.fadeTo(), and another element laid over the top that will contain your foreground content and on which you can call $.hover() with your handlers.

回答8:

$(".block li").hover( function(){ $(this).animate({backgroundColor: "#000"}); }, function(){ $(this).animate({backgroundColor: $(this).parent().css("backgroundColor") }); } );

回答9:

I got a solution to this issue from this link

$('#test').animate({

backgroundColor: "#DFC21D",

}, 1000, function() {

$('#test').css("backgroundColor","transparent");

});

来源：https://stackoverflow.com/questions/3679864/jquery-animate-to-transparent

标签

jquery

jquery-animate

jQuery animate to transparent

问题