Javascript 反转fullpage.js中图像回调的颜色
我已经将幻灯片箭头更改为我自己的png,黑色箭头,但在一些背景较暗的幻灯片上,我想将它们反转为白色Javascript 反转fullpage.js中图像回调的颜色,javascript,jquery,css,webkit,fullpage.js,Javascript,Jquery,Css,Webkit,Fullpage.js,我已经将幻灯片箭头更改为我自己的png,黑色箭头,但在一些背景较暗的幻灯片上,我想将它们反转为白色 -webkit-filter: invert(100%); 工作正常,但如何仅在使用回调的幻灯片上触发此操作 反转参数0%>100%的快速动画将是一个很酷的奖励。谢谢。我不知道fullPage.js,但通过阅读,我发现您可以自定义在离开或进入幻灯片时触发的回调 我想这就是你想要的: jsFiddle- 请注意,我只使用-webkit filter来反转颜色,因此这在其他非webkit浏览器中可能
-webkit-filter: invert(100%);
工作正常,但如何仅在使用回调的幻灯片上触发此操作
反转参数0%>100%的快速动画将是一个很酷的奖励。谢谢。我不知道
fullPage.js
,但通过阅读,我发现您可以自定义在离开或进入幻灯片时触发的回调
我想这就是你想要的:
jsFiddle-
请注意,我只使用-webkit filter
来反转颜色,因此这在其他非webkit浏览器中可能不起作用。比如,在Chrome中测试一下。否则,在添加/删除样式时,只需向过滤器属性添加更多前缀即可。这取决于您如何更改箭头,但是您可以,例如(使用fullPage.js),只更改边框颜色而不使用过滤器
基本上,我们使用afterSlideLoad和onSlideLeave回调来实现这一点。下面是注释中的解释代码。这很简单。我的评论比需要的代码要长得多,只是希望它是清楚的
示例HTML:
<div class="section">
<div class="slide" data-anchor="slide1"> Slide 1 - Index 0 </div>
<div class="slide" data-anchor="slide2"> Slide 2 - Index 1 </div>
<div class="slide slide-dark" data-anchor="slide3"> Slide 3 - Index 2 <br> I'm black </div>
<div class="slide" data-anchor="slide4"> Slide 4 - Index 3</div>
</div>
// Just take into consideration the callback methods.
// The body selector is the one I used in the jsFiddle, keep whatever you have.
$(document).ready(function() {
$('body').fullpage({
// The name is self explanatory.
// Fires when a a slide has finished loading
// and returns info about the slide.
// This is helpful so we can know when we are on the
// darker slide(s)
afterSlideLoad: function (anchorLink, index, slideAnchor, slideIndex) {
// Notice that in the HTML I set the data-anchor attribute,
// since that can help us be specific about what slide we are in.
// Otherwise, just use the index, which is probably a good idea
// since onSlideLeave doesn't return the slideAnchor parameter,
// for some reason.
// Change the if statement to whatever fits your needs.
// Check what index and/or anchor your darker slides are.
if(slideAnchor === 'slide3' || slideIndex === 2) {
// This adds the invert filter to the controlArrow(s),
// effectively reversing their color WHEN inside of
// this specific slide.
// (In this example, slideIndex 2 with anchor 'slide3').
$('.fp-controlArrow').css('-webkit-filter', 'invert(100%)');
}
},
// This fires when leaving a slide.
// This will be helpful to return the arrows to their
// default color. (When we know we've inverted them beforehand)
onSlideLeave: function (anchorLink, index, slideIndex, direction) {
// We inverted the color of the arrows in slide 3.
// When leaving this slide, we roll them back to their
// original color, by setting the filter to 'none'.
// I don't know why this 'event' doesn't return the
// slideAnchor parameter, so we will just use the index
// in here, which is slideIndex === 2 for 'slide3'.
// Again, change the if logic to fit your needs, i.e. add
// more slides.
if(slideIndex === 2) {
// This removes the filter, arrows go back to their
// original color.
$('.fp-controlArrow').css('-webkit-filter', 'none');
}
}
});
});
以及在过滤器上平滑过渡所需的CSS(将动画速度更改为您希望的任何速度):
关于动画-你需要使用过渡:我不明白这个问题。你想只为带有特定ID的幻灯片触发新的css吗?这正是我需要的。非常感谢!没问题!很高兴它有用。
.fp-controlArrow {
-webkit-transition: all 500ms;
transition: all 500ms;
}