[英]How do you make an image change on click and revert upon release using HTML/CSS/JS
[英]How do you automate an image carousel using HTML, JS, & CSS?
我不是很擅長JS,所以我不得不通過視頻解釋如何使用HTML、CSS和JS制作圖像輪播。 我希望能夠使它自動化,但由於我缺乏經驗,不知道該怎么做。 如果有人可以解釋如何修改此代碼以能夠通過箭頭進行手動輸入並自動循環到下一張圖像,我將不勝感激。
這是手動按鈕 slider 的代碼(HTML、JS、CSS)
<section aria-label = 'sliderImages'>
<div class = 'slider' data-slider>
<button class = 'backButton' data-slider-button = 'previous'></button>
<button class = 'nextButton' data-slider-button = 'next'></button>
<ul data-slides>
<li class = 'slide' data-active>
<img src = '/Images/Red.png' alt = ''>
</li>
<li class = 'slide'>
<img src = '/Images/Yellow.png' alt = ''>
</li>
<li class = 'slide'>
<img src = '/Images/Blue.png' alt = ''>
</li>
<li class = 'slide'>
<img src = '/Images/Green.png' alt = ''>
</li>
</ul>
</div>
</section>
const buttons = document.querySelectorAll('[data-slider-button]')
buttons.forEach(button => {
button.addEventListener('click', () => {
const offset = button.dataset.sliderButton === 'next' ? 1 : -1
const slides = button
.closest('[data-slider]')
.querySelector('[data-slides]')
const activeSlide = slides.querySelector('[data-active]')
let newIndex = [...slides.children].indexOf(activeSlide) + offset
if (newIndex < 0) newIndex = slides.children.length - 1
if (newIndex >= slides.children.length) newIndex = 0
slides.children[newIndex].dataset.active = true
delete activeSlide.dataset.active
})
})
*{
margin: 0;
padding: 0;
box-sizing: border-box;
}
.slides {
width: 100%;
height: 100vh;
position: relative;
}
.slide {
position: absolute;
inset: 0;
opacity: 0;
transition: 0.8s opacity ease-in;
transition-delay: 0.8s;
}
.slide[data-active] {
opacity: 1;
transition-delay: 0s;
z-index: 1;
}
.slide > img {
display: block;
width: 100%;
height: 100%;
object-fit: cover;
object-position: center;
}
.backButton {
position: absolute;
width: 24px;
height: 45px;
top: 50%;
left: 50px;
transform: translate(0%, 50%);
border: none;
background: url('/Images/Left Arrow.png');
z-index: 2;
}
.backButton:hover {
cursor: pointer;
}
.nextButton {
position: absolute;
width: 24px;
height: 45px;
top: 50%;
right: 50px;
transform: translate(0%, 50%);
border: none;
background: url('/Images/Right Arrow.png');
z-index: 2;
}
.nextButton:hover {
cursor: pointer;
}
您可以使用以下代碼制作自動圖像 slider。或者更改您的 js 代碼並設置 setTimeout() function。
let slideIndex = 0; showSlides(); function showSlides() { let i; let slides = document.getElementsByClassName("mySlides"); let dots = document.getElementsByClassName("dot"); for (i = 0; i < slides.length; i++) { slides[i].style.display = "none"; } slideIndex++; if (slideIndex > slides.length) {slideIndex = 1} for (i = 0; i < dots.length; i++) { dots[i].className = dots[i].className.replace(" active", ""); } slides[slideIndex-1].style.display = "block"; dots[slideIndex-1].className += " active"; setTimeout(showSlides, 2000); // Change image every 2 seconds }
* {box-sizing: border-box;}.mySlides {display: none;} img {vertical-align: middle;} /* Slideshow container */.slideshow-container { max-width: 1000px; position: relative; margin: auto; } /* Caption text */.text { color: #f2f2f2; font-size: 15px; padding: 8px 12px; position: absolute; bottom: 8px; width: 100%; text-align: center; } /* Number text (1/3 etc) */.numbertext { color: #f2f2f2; font-size: 12px; padding: 8px 12px; position: absolute; top: 0; } /* The dots/bullets/indicators */.dot { height: 15px; width: 15px; margin: 0 2px; background-color: #bbb; border-radius: 50%; display: inline-block; transition: background-color 0.6s ease; }.active { background-color: #717171; } /* Fading animation */.fade { animation-name: fade; animation-duration: 1.5s; } @keyframes fade { from {opacity: .4} to {opacity: 1} } /* On smaller screens, decrease text size */ @media only screen and (max-width: 300px) {.text {font-size: 11px} }
<h2>Automatic Slideshow</h2> <p>Change image every 2 seconds:</p> <div class="slideshow-container"> <div class="mySlides fade"> <div class="numbertext">1 / 3</div> <img src="https://www.w3schools.com/howto/img_nature_wide.jpg" style="width:100%"> <div class="text">Caption Text</div> </div> <div class="mySlides fade"> <div class="numbertext">2 / 3</div> <img src="https://www.w3schools.com/howto/img_snow_wide.jpg" style="width:100%"> <div class="text">Caption Two</div> </div> <div class="mySlides fade"> <div class="numbertext">3 / 3</div> <img src="https://www.w3schools.com/howto/img_mountains_wide.jpg" style="width:100%"> <div class="text">Caption Three</div> </div> </div> <br> <div style="text-align:center"> <span class="dot"></span> <span class="dot"></span> <span class="dot"></span> </div>
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