英雄滑块:第一张幻灯片最初不加载
Hero Slider: First slide does not load, initially
我不太熟悉jQuery和/或JavaScript,但我试图使用英雄滑块为我正在建设的网站。我已经修改了很多代码来做我想做的事情,但由于某种原因,第一张幻灯片似乎无法加载。奇怪的是,当滑块循环回到开始的幻灯片时,它显示得很好。如果让我大胆猜测,我会说有些东西没有按照正确的顺序加载,但我无法找出错误。JQuery在头部被调用,而脚本(下面的代码)在</body>
之前被调用。我已经创建了一个JSFiddle,如果有人能提供关于为什么它不能正常工作的见解,我将非常感激。另外,虽然这不是很重要,但如果有人能告诉我上面角落的小点是从哪里来的,我将不胜感激。
<section class="cd-hero">
<ul class="cd-hero-slider autoplay">
<li>
<div class="cd-full-width">
<h2>1. Slide title here</h2>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Animi, explicabo.</p>
</div>
</li>
<li>
<div class="cd-full-width">
<h2>2. Slide title here</h2>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Animi, explicabo.</p>
</div>
</li>
</ul>
</section>
JS
jQuery(document).ready(function($){
var slidesWrapper = $('.cd-hero-slider');
//check if a .cd-hero-slider exists in the DOM
if ( slidesWrapper.length > 0 ) {
var primaryNav = $('.cd-primary-nav'),
sliderNav = $('.cd-slider-nav'),
navigationMarker = $('.cd-marker'),
slidesNumber = slidesWrapper.children('li').length,
visibleSlidePosition = 0,
autoPlayId,
autoPlayDelay = 5000;
//upload videos (if not on mobile devices)
uploadVideo(slidesWrapper);
//autoplay slider
setAutoplay(slidesWrapper, slidesNumber, autoPlayDelay);
//on mobile - open/close primary navigation clicking/tapping the menu icon
primaryNav.on('click', function(event){
if($(event.target).is('.cd-primary-nav')) $(this).children('ul').toggleClass('is-visible');
});
//change visible slide
sliderNav.on('click', 'li', function(event){
event.preventDefault();
var selectedItem = $(this);
if(!selectedItem.hasClass('selected')) {
// if it's not already selected
var selectedPosition = selectedItem.index(),
activePosition = slidesWrapper.find('li.selected').index();
if( activePosition < selectedPosition) {
nextSlide(slidesWrapper.find('.selected'), slidesWrapper, sliderNav, selectedPosition);
} else {
prevSlide(slidesWrapper.find('.selected'), slidesWrapper, sliderNav, selectedPosition);
}
//this is used for the autoplay
visibleSlidePosition = selectedPosition;
updateSliderNavigation(sliderNav, selectedPosition);
updateNavigationMarker(navigationMarker, selectedPosition+1);
//reset autoplay
setAutoplay(slidesWrapper, slidesNumber, autoPlayDelay);
}
});
}
function nextSlide(visibleSlide, container, pagination, n){
visibleSlide.removeClass('selected from-left from-right').addClass('is-moving').one('webkitTransitionEnd otransitionend oTransitionEnd msTransitionEnd transitionend', function(){
visibleSlide.removeClass('is-moving');
});
container.children('li').eq(n).addClass('selected from-right').prevAll().addClass('move-left');
checkVideo(visibleSlide, container, n);
}
function prevSlide(visibleSlide, container, pagination, n){
visibleSlide.removeClass('selected from-left from-right').addClass('is-moving').one('webkitTransitionEnd otransitionend oTransitionEnd msTransitionEnd transitionend', function(){
visibleSlide.removeClass('is-moving');
});
container.children('li').eq(n).addClass('selected from-left').removeClass('move-left').nextAll().removeClass('move-left');
checkVideo(visibleSlide, container, n);
}
function updateSliderNavigation(pagination, n) {
var navigationDot = pagination.find('.selected');
navigationDot.removeClass('selected');
pagination.find('li').eq(n).addClass('selected');
}
function setAutoplay(wrapper, length, delay) {
if(wrapper.hasClass('autoplay')) {
clearInterval(autoPlayId);
autoPlayId = window.setInterval(function(){autoplaySlider(length)}, delay);
}
}
function autoplaySlider(length) {
if( visibleSlidePosition < length - 1) {
nextSlide(slidesWrapper.find('.selected'), slidesWrapper, sliderNav, visibleSlidePosition + 1);
visibleSlidePosition +=1;
} else {
prevSlide(slidesWrapper.find('.selected'), slidesWrapper, sliderNav, 0);
visibleSlidePosition = 0;
}
updateNavigationMarker(navigationMarker, visibleSlidePosition+1);
updateSliderNavigation(sliderNav, visibleSlidePosition);
}
function uploadVideo(container) {
container.find('.cd-bg-video-wrapper').each(function(){
var videoWrapper = $(this);
if( videoWrapper.is(':visible') ) {
// if visible - we are not on a mobile device
var videoUrl = videoWrapper.data('video'),
video = $('<video loop><source src="'+videoUrl+'.mp4" type="video/mp4" /><source src="'+videoUrl+'.webm" type="video/webm" /></video>');
video.appendTo(videoWrapper);
// play video if first slide
if(videoWrapper.parent('.cd-bg-video.selected').length > 0) video.get(0).play();
}
});
}
function checkVideo(hiddenSlide, container, n) {
//check if a video outside the viewport is playing - if yes, pause it
var hiddenVideo = hiddenSlide.find('video');
if( hiddenVideo.length > 0 ) hiddenVideo.get(0).pause();
//check if the select slide contains a video element - if yes, play the video
var visibleVideo = container.children('li').eq(n).find('video');
if( visibleVideo.length > 0 ) visibleVideo.get(0).play();
}
function updateNavigationMarker(marker, n) {
marker.removeClassPrefix('item').addClass('item-'+n);
}
$.fn.removeClassPrefix = function(prefix) {
//remove all classes starting with 'prefix'
this.each(function(i, el) {
var classes = el.className.split(" ").filter(function(c) {
return c.lastIndexOf(prefix, 0) !== 0;
});
el.className = $.trim(classes.join(" "));
});
return this;
};
});
最初,第一个<li>
没有任何类。如果将<li class="selected from-right">
添加到第一个<li>
,则出现第一张幻灯片。
此外,要删除幻灯片前的点,只需在css.
ul{list-style-type:none;}
。
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