通过js添加类不会触发CSS动画 [英] Adding class via js won't trigger css animation

问题描述

我有一个 animate.css 的修改版(增加了一些延迟，新的时间安排和新的职位)，并且在默认情况下设置类(html文档)时，它的工作原理非常好.但是当我通过js动态添加动画类时，不会执行动画！

I have a modified version of animate.css (added some delay, new timings and new positions), and it works really great when the classes are set by default (html document). But when I am adding the animate class dynamically via js, the animation is not executed!

更烦人的是，我确实在某个时候可以使它工作，但是我无法使其再次工作(当元素在屏幕上时使用gumby框架和inview js添加一个类(添加.animated)).左框具有html中已经存在的类，右框具有js添加的.animate类.

Even more annoying, I did have it working at some point, but I can't get it to work again (using gumby framework and inview js to add a class when the element is on screen (adding .animated)) . The left box had the classes already in the html, and the right box have the .animate class added by js.

示例:
http://onepageframework.com/28_2_14/strange_anim.html

有什么想法为什么右边的盒子没有动画?

Any ideas why the right box is not animating?

使用Gumby inview扩展名: http://gumbyframework.com/docs/extensions/#！/inview

Using the Gumby inview extension: http://gumbyframework.com/docs/extensions/#!/inview

添加了html:

<div class="six columns text-center fadeInLeftMedium delay_2 animated">
    <!-- left box content here -->
</div>
<div class="six columns text-center fadeInLeftMedium delay_2 inview" data-classname="animated">
    <!-- right box content here -->
</div>

css:

.animated {
    -webkit-animation-duration: 1s;
       -moz-animation-duration: 1s;
         -o-animation-duration: 1s;
            animation-duration: 1s;
    -webkit-animation-fill-mode: both;
       -moz-animation-fill-mode: both;
         -o-animation-fill-mode: both;
            animation-fill-mode: both;
}

.delay_2 {
    -webkit-animation-delay: 2s;
       -moz-animation-delay: 2s;
         -o-animation-delay: 2s;
            animation-delay: 2s;    
}

@-webkit-keyframes fadeInLeftMedium {
    0% {
        opacity: 0;
        -webkit-transform: translateX(-400px);
    }

    100% {
        opacity: 1;
        -webkit-transform: translateX(0);
    }
}
@-moz-keyframes fadeInLeftMedium {
    0% {
        opacity: 0;
        -moz-transform: translateX(-400px);
    }

    100% {
        opacity: 1;
        -moz-transform: translateX(0);
    }
}
@-o-keyframes fadeInLeftMedium {
    0% {
        opacity: 0;
        -o-transform: translateX(-400px);
    }

    100% {
        opacity: 1;
        -o-transform: translateX(0);
    }
}
@keyframes fadeInLeftMedium {
    0% {
        opacity: 0;
        transform: translateX(-400px);
    }

    100% {
        opacity: 1;
        transform: translateX(0);
    }
}

.fadeInLeftMedium {
    -webkit-animation-name: fadeInLeftMedium;
    -moz-animation-name: fadeInLeftMedium;
    -o-animation-name: fadeInLeftMedium;
    animation-name: fadeInLeftMedium;
}

推荐答案

原因相同，为什么您只能通过随后删除并添加一个类来重新触发基于CSS的动画.原因是浏览器对这些修改进行批处理并优化了动画.在此处中讨论原因和解决方案.

The reason is the same why you can't re-trigger CSS based animations by just subsequently removing and adding a class. The reason is that browsers batch-up these modifications and optimize away the animation. Reason and solutions are discussed here.

在本文中，您的选择(解释为):

From the article, your options are (paraphrased):

1. 在重新添加课程之前稍加延迟(不推荐)
2. 克隆元素，将其删除，然后插入克隆
3. 具有2个相同的动画(附加到不同的CSS规则)并在它们之间切换
4. 在删除和添加类名之间触发重排:

        element.classList.remove("run-animation");
     // element.offsetWidth = element.offsetWidth; //doesn't work in strict mode
        void element.offsetWidth; // reading the property requires a recalc
        element.classList.add("run-animation");

1. 更改(循环)元素的CSS 动画播放-state 属性设置为已暂停或正在运行(不会重新启动动画)

1. Change (cycle) the element's CSS animation-play-state attribute to paused or running (does not restart animation)

这篇关于通过js添加类不会触发CSS动画的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！