检测哪个CSS动画刚在JavaScript中结束? [英] Detect which CSS animation just ended in JavaScript?

问题描述

如何检测JavaScript中刚刚完成的CSS动画?

How can you detect which CSS animation just finished in JavaScript?

最终的需求是重新触发CSS动画.由于我们的HTML层次结构，我们宁愿不检查元素的类，而只在特定动画结束时才采取措施.如果您有一种方法可以允许在不删除/添加类的情况下重新触发动画，请告诉我们.

The ultimate need is to re-trigger a CSS animation. Due to our HTML hierarchy, we prefer not checking the element's class but instead taking action only when a particular animation ends. If you have a method that allows re-triggering an animation without removing/adding a class, please let us know.

否则...我们的代码:

Otherwise... our code:

    page.find( '.button.letter' ).on( 'webkitAnimationEnd', function() {
        $( this ).removeClass( 'tap_animation' );

        console.log( 'Hi: ' + this.style.webkitAnimationName );

        if ( !write_mode() ) {
            do_write( this );
        }
    });

this.style.webkitAnimationName 始终返回空字符串.

我们在做错什么吗?

我们需要WebKit浏览器的代码，特别是Mobile Safari.

We need the code for WebKit browsers, specifically Mobile Safari.

谢谢！

推荐答案

在jQuery中，您可以访问originalEvent对象，然后从该对象中访问animationName属性:

From jQuery you can access the originalEvent object, and, from there, the animationName property:

$('body').on('webkitAnimationEnd', function(e){
    var animName = e.originalEvent.animationName;
    console.log(animName);
});​

(仅限Webkit)JS Fiddle演示.

从那里开始，只需使用if来检查/表示动画名称是什么(过去时，我想假设它已结束).

From there, simply use an if to check what the animation name is/was (past-tense, I suppose, given that it ended).

以上内容进行了更新，可能会提供更好的说明:

The above updated, to give possibly a better illustration:

$('div').on('webkitAnimationEnd', function(e){
    var animName = e.originalEvent.animationName;
    if (animName == 'bgAnim') {
        alert('the ' + animName + ' animation has finished');
    }
});​

(仅限Webkit)JS Fiddle演示.

此演示使用以下HTML:

This demo uses the following HTML:

<div><span>text</span></div>​

和CSS:

@-webkit-keyframes bgAnim {
    0%, 100% {
        color: #000;
        background-color: #f00;
    }
    50% {
        color: #fff;
        background-color: #0f0;
    }
}

@-webkit-keyframes fontSize {
    0%, 100% {
        font-size: 100%;
    }
    50% {
        font-size: 300%;
    }
}

div {
    font-weight: bold;
    -webkit-animation: bgAnim;
    -webkit-animation-duration: 2s;
    -webkit-animation-iteration-count: 2;
}

span {
    font-size: 100%;
    font-weight: bold;
    -webkit-animation: fontSize;
    -webkit-animation-duration: 4s;
    -webkit-animation-iteration-count: 1;
}

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