Play Gif on Mouseover and Pause Gif on mouse out without replacing images?

问题

I'm trying to look for an example of code that allows the user to animate a gif on mouseover and pause when mouse out. I've seen many tutorials talking about this but I want a different effect.

I noticed that most gifs "reset" when on mouse out. That is, either the gif is covered with a generic image or the animation reverts back to the start. What I would like to achieve is a more seamless "pause" that allows you to start where you left off without using a placeholder image. Similar to the example on this page:

http://www.valhead.com/2013/03/11/animation-play-state/

Notice how when you put the mouse over the image, the animation just pauses without replacing anything, and resumes otherwise.

I don't know if it's possible with a gif because this example is using basic css shapes, but there has to be some way to pause the gif on mouse out and resume on mouse over without covering the image on a looping animation? If not is there a way to use a movie file that pauses on mouse over and plays where it left off when you put the mouse over it?

Thanks!

EDIT: Thanks to @brbcoding and his genius, this issue was solved! Details on the solution can be found either in the posts below or on his blog post: http://codyhenshaw.com/blog/2013/12/17/faux-animated-gifs-with-css3-keyframes/

回答1:

So, I thought about it for a bit... You could do something cool like this:

First, break your gif into multiple images, then animate them with css keyframes.

#faux-gif {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    margin: auto;
    background-image: url(http://i.imgur.com/E2ee6fI.gif);
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-position: center;
    width: 300px;
    height: 300px;
    /* animation: giffy 0.5s infinite linear; */
    /* no fade between frames */
    animation: giffy 0.5s infinite steps(1);
}

#faux-gif:hover {
    animation-play-state:paused;
}

@keyframes giffy {
    0%   { background-image: url('http://i.imgur.com/E2ee6fI.gif'); } 
    15%  { background-image: url('http://i.imgur.com/JIi0uul.gif'); }
    30%  { background-image: url('http://i.imgur.com/owNGnNN.gif');}
    45%  { background-image: url('http://i.imgur.com/2Ii6XOz.gif'); }
    60%  { background-image: url('http://i.imgur.com/ZmQBrQ5.gif'); }
    75%  { background-image: url('http://i.imgur.com/iAsfHyY.gif'); }
    90%  { background-image: url('http://i.imgur.com/AJwRblj.gif'); }
    100% { background-image: url('http://i.imgur.com/fx5wUNY.gif'); }
}

DEMO

JavaScript Version... Not tested very thoroughly, but this would be the basic idea.

window.onload = function() {

    function FauxGif(element, frames, speed) {
        this.currentFrame = 0,
        this.domElement   = element,
        this.frames       = frames || null,
        this.speed        = speed  || 200;
        this.interval;
        this.init();
    }

    FauxGif.prototype = {
        init: function() {
            // set the first one to the first image
            console.log(this.frames[0])
            this.domElement.style.backgroundImage = "url(" + this.frames[0] + ")";
        },
        pause: function() {
            clearInterval(this.interval);
        },
        resume: function() {
            var that = this;

            that.interval = setInterval(function(){
                that.currentFrame < that.frames.length - 1 ? that.currentFrame++ : that.currentFrame = 0;
                that.domElement.style.backgroundImage = "url(" + that.frames[that.currentFrame] + ")";
            }, this.speed);
        }
    }

    var frames = [
                    'http://i.imgur.com/E2ee6fI.gif',
                    'http://i.imgur.com/JIi0uul.gif',
                    'http://i.imgur.com/owNGnNN.gif',
                    'http://i.imgur.com/2Ii6XOz.gif',
                'http://i.imgur.com/ZmQBrQ5.gif',
                'http://i.imgur.com/iAsfHyY.gif',
                'http://i.imgur.com/AJwRblj.gif',
                'http://i.imgur.com/fx5wUNY.gif'
            ]

var elem = document.querySelector('#faux-gif'),
    gif  = new FauxGif(elem, frames);


elem.addEventListener('mouseenter', function(){
    gif.resume()
});

elem.addEventListener('mouseleave', function() {
    gif.pause();
});
}

DEMO

回答2:

There is not. Gif images can not "see" the mouse. They are merely images which display. In order to pause an animated gif it requires the swapping of a similar image which is not animated.

That being posted, there are jquery plug ins to animate a sprite consisting of static images. These plug ins would allow the sprites to pause on mouse over

来源：https://stackoverflow.com/questions/20644209/play-gif-on-mouseover-and-pause-gif-on-mouse-out-without-replacing-images