我想构建一个带有按钮的滑块,但我不知道该怎么做。当我点击右键时,它会滑动 2 页然后显示空白,并认为问题出在 arrowRight 功能上。 如果有人知道为什么我的代码不起作用,请向我解释。
//FOR SLIDER
let sliderImages = document.querySelectorAll(".slide"),
arrowLeft = document.querySelector("#arrow-left"),
arrowRight = document.querySelector("#arrow-right"),
current = 0;
function reset() {
for (let i = 0; i < sliderImages.length; i++) {
sliderImages[i].style.display = 'none';
}
}
function startSlide() {
reset();
sliderImages[0].style.display = 'block';
}
startSlide();
function slideLeft() {
reset();
sliderImages[current - 1].style.display = 'block';
current--
}
arrowLeft.addEventListener('click', function () {
if (current === 0) {
current = sliderImages.length;
}
slideLeft();
})
function slideRight() {
reset();
sliderImages[current + 1].style.display = 'block';
current++
}
arrowRight.addEventListener('click', function () {
if (current === sliderImages.length) {
current = 0;
}
slideRight();
})
我认为你的方法不适合这项任务。通常它是两个容器 - 一个用于可见部分,另一个充满图像。它看起来像这样:
const sliderImages = document.querySelectorAll(".slide"),
arrowLeft = document.querySelector("#arrow-left"),
arrowRight = document.querySelector("#arrow-right"),
container = document.querySelector(".container");
document.addEventListener("DOMContentLoaded", function() {
container.style.width = 100 * sliderImages.length + "%";
sliderImages.forEach((el) => {
el.style.width = 100 / sliderImages.length + "%";
})
startSlider()
});
function startSlider() {
let pos = 0;
arrowLeft.addEventListener("click", slideLeft)
arrowRight.addEventListener("click", slideRight)
function slideLeft() {
if(pos === 0) {
pos = sliderImages.length - 1;
} else{
pos--;
}
slide()
}
function slideRight() {
if(pos === sliderImages.length - 1) {
pos = 0;
} else {
pos++;
}
slide()
}
function slide() {
$(container).animate({left: -100 * pos + "%"}, 500)
}
}
*{
padding: 0;
margin: 0;
}
body{
width: 100%;
}
.outer-container {
width: 80%;
margin: 5px auto;
overflow: hidden;
position: relative;
}
.slide > img {
width: 100%;
}
.container {
display: flex;
position: relative;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="outer-container">
<div id="arrow-left">LEFT</div>
<div id="arrow-right">RIGHT</div>
<div class="container">
<div class="slide">
<img src="https://images.unsplash.com/photo-1518791841217-8f162f1e1131?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&w=1000&q=80">
</div>
<div class="slide">
<img src="https://cdn.pixabay.com/photo/2017/02/20/18/03/cat-2083492_960_720.jpg">
</div>
<div class="slide">
<img src="https://media.boingboing.net/wp-content/uploads/2019/02/cats.jpg">
</div>
<div class="slide">
<img src="https://cdn-images-1.medium.com/max/1600/1*mONNI1lG9VuiqovpnYqicA.jpeg">
</div>
</div>
</div>
如果您只是对代码进行修复,那么我更改了以下内容:
arrowRight.addEventListener('click', function () {
//Make sure that's current less than the number of images
if (current + 1 == sliderImages.length) {
current = 0;
} else {
current++;
}
slide();
})
//Moved checks and current position management from slide
//Functions to click listeners
arrowLeft.addEventListener('click', function () {
if (current === 0) {
current = sliderImages.length - 1;
} else {
current--;
}
slide();
})
//That let me merge your two function into one
//And your checks for positions was a little off
function slide(){
reset();
sliderImages[current].style.display = 'block';
}
我希望我的回答对你有所帮助。如果您对此代码有任何疑问,请在下面添加注释。