html - 根据横向或纵向照片切换 .carousel 高度和宽度
问题描述
我使用下面的代码将我的风景(4:3)照片放在轮播中。但我想根据照片(风景或肖像)更改 .carousel 的宽度和高度。我怎样才能做到这一点?
html {
height: 100%;
width: 100%;
}
body {
height: 100%;
width: 100%;
display: block;
}
.carousel {
/* the percentages below are for a 4:3 landscape photo(1600x1200) */
height: 60%;
width: 70%;
}
/* 我需要设置高度:70%;和宽度:纵向的 60% */
我应该向 carousel-item 添加一个类以指示它是风景照片还是肖像照片?
解决方案
创建一个纵向类和一个横向类。当图像加载或获得图像大小时,确定它是纵向还是横向,然后将适当的类添加到图像或轮播容器中。
// list of images - as requested you can put this list in a separate js file
// make sure it is before the other code below
var imagesArray = ["https://lorempixel.com/300/500/animals/1", "https://lorempixel.com/300/500/animals/2", "https://lorempixel.com/500/300/animals/1","https://lorempixel.com/500/300/animals/2","https://lorempixel.com/500/300/city/1","https://lorempixel.com/300/500/city/2"];
// when the user clicks the random button
// we get a random image from our list of URLS
// and then set that as the source of the image
function displayImage(direction, isURL) {
var image = document.getElementById("myImage");
var label = document.getElementById("loadingLabel");
var list = imagesArray.slice(); //make a copy
var currentURL = image.src;
var currentIndex;
var index = 0;
var numberOfImages = list.length;
if (isURL==true) {
currentURL = direction;
}
currentIndex = list.indexOf(currentURL);
if (direction=="next") {
index = currentIndex>=list.length-1 ? 0 : currentIndex+1;
}
else if (direction=="previous") {
index = currentIndex<=0 ? list.length-1 : currentIndex-1;
}
else if (direction=="random") {
list.splice(currentIndex,1);
index = Math.floor(Math.random()*list.length);
}
else if (direction=="start") {
index = 0;
}
else if (direction=="end") {
index = list.length-1;
}
else if (isURL) {
if (currentIndex==-1) {
console.log("Image not found in images array. Check the URL");
return;
}
index = currentIndex;
}
else {
console.log("Direction not specified");
}
image.src = list[index];
label.innerHTML = "Loading " + list[index] + "...";
label.title = list[index];
updateNavigationLabel();
}
// this handles when the image has finished loading
// we check if the image is portrait or landscape
// if it is landscape we set the landscape class
// if it is portrait we set the portrait class
function imageLoadHandler(event) {
var image = document.getElementById("myImage");
var carousel = document.getElementById("myCarousel");
var label = document.getElementById("loadingLabel");
var width = image.naturalWidth;
var height = image.naturalHeight;
var isPortrait = width<height;
var isSquare = width==height;
carousel.classList.remove("portrait");
carousel.classList.remove("landscape");
var caption = width + "x" + height;
if (isPortrait) {
caption = "Portrait (" + caption + ")";
carousel.classList.add("portrait");
}
else if (isPortrait==false) {
caption = "Landscape (" + caption + ")";
carousel.classList.add("landscape");
}
image.caption = caption;
label.innerHTML = caption;
updateNavigationLabel();
}
function updateNavigationLabel() {
var image = document.getElementById("myImage");
var label = document.getElementById("navigationLabel");
var list = imagesArray.slice(); //make a copy
var numberOfImages = list.length;
var currentURL = image.src;
currentIndex = list.indexOf(currentURL);
label.innerHTML = currentIndex+1 +" of " + numberOfImages;
}
window.addEventListener("DOMContentLoaded", function() {
var element = document.getElementById("myImage");
var button = document.getElementById("button");
var carousel = document.getElementById("myCarousel");
// listen for when an image loads
element.addEventListener("load", imageLoadHandler);
// listen for when the user clicks on the random button
button.addEventListener("click", function() {
displayImage('random')
});
// Options - load an image when the page loads
// displayImage("start"); // use to load the first image
// displayImage("end"); // use to load the last image
// displayImage("random"); // use to load a random image
// displayImage("specified", "https://lorempixel.com/300/500/animals/2"); // use to load an image in the images array
displayImage("https://lorempixel.com/300/500/animals/2", true);
});
.landscape {
height: 60%;
width: 70%;
outline:2px solid blue;
}
.portrait {
height: 70%;
width: 60%;
outline:2px solid purple;
}
#myCarousel {
position: absolute;
left: 50%;
transform: translateX(-50%);
}
#myImage {
position: absolute;
left: 50%;
transform: translateX(-50%);
outline: 1px dashed red;
height: 100%;
width: 100%;
object-fit: contain;
}
#button {
position: fixed;
right: 10px;
top: 50px;
}
#loadingLabel {
position: absolute;
bottom: -20px;
left: 50%;
transform: translateX(-50%);
font: 10px sans-serif;
white-space: nowrap;
}
#navigationLabel {
font: 10px sans-serif;
}
#navigation {
position: absolute;
bottom: 10px;
left: 50%;
transform: translateX(-50%);
font: 10px sans-serif;
}
<!-- optionally set images in separate file. order before the main javascript -->
<script src="myimages.js"></script>
<div id="myCarousel" class="landscape">
<img id="myImage">
<label id="loadingLabel"></label>
</div>
<button id="button">random</button>
<div id="navigation">
<button id="prev" onclick="displayImage('previous')">prev</button>
<label id="navigationLabel"></label>
<button id="next" onclick="displayImage('next')">next</button>
</div>
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