尝试使用 jQuery 放大图像

Question

Here is a short function that enlarges an image on click. Everything works fine when I only use one image. Adding a second image, it doesn't work anymore and I have no clue why.

JSFIDDLE

jQuery:

var classes = ["zoom0", "zoom50", "zoom100"];
var index = 0;
var classList = document.querySelector(".bla").classList;
const len = classes.length;

$('.zoom-img').click(function() {
  classList.replace(classes[index++ % len], classes[index % len]);
});

HTML:

<!--This works-->
<div class="zoom-img">
<div class="zoom0 bla">
<img src="https://img.lemde.fr/2022/09/27/468/0/2800/1400/1600/800/60/0/4a83504_1664286495065-113206.jpg">
</div></div>

<!--This does not-->
<div class="zoom-img">
<div class="zoom0 bla">
<img src="https://img.lemde.fr/2022/09/27/468/0/2800/1400/1600/800/60/0/4a83504_1664286495065-113206.jpg">
</div></div>

Answer 1

Move the assignment of classList

var classList = document.querySelector(".bla").classList;

inside the .click(function() {}) .

Answer 2

First, querySelector will get the first bla element, that's why only the first image gets zoomed, you need to get the bla element inside each image container, so set it inside the click handler and set the querySelector of the currentTarget .

Second, each image should have it's own index of zoom list, so, you need to get the className of the bla element and find the current zoom , and make the calculation depend on it.

 var classes = ["zoom0", "zoom50", "zoom100"]; const len = classes.length; $('.zoom-img').click(function(e) { const bla = e.currentTarget.querySelector(".bla") var classList = bla.classList; let currentZoom = bla.className.match(/zoom[0-9]{1,3}/)[0] let currentIndex = classes.findIndex(c => c === currentZoom) classList.replace(classes[currentIndex++ % len], classes[currentIndex % len]); });

 .zoom0 { width: 20vw; transition: width 0.25s, height 4s; transition-timing-function: ease; }.zoom50 { width: 50vw; transition: width 0.15s, height 4s; transition-timing-function: ease; }.zoom0, .zoom50 { cursor: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='48' height='48' viewBox='0 0 48 48'%3E%3Ctitle%3EArtboard 1icon-1%3C/title%3E%3Cg opacity='0.9'%3E%3Ccircle cx='24' cy='24' r='24'/%3E%3C/g%3E%3Cpolygon points='34 23 25 23 25 14 23 14 23 23 14 23 14 25 23 25 23 34 25 34 25 25 34 25 34 23' fill='%23fff'/%3E%3C/svg%3E") 24 24, zoom-in; cursor: -webkit-image-set(url("data:image/png;base64,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") 1x, url("data:image/png;base64,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") 2x) 24 24, zoom-in; }.zoom100 { width: 100vw; transition: width 0.15s, height 4s; transition-timing-function: ease; cursor: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='48' height='48' viewBox='0 0 48 48'%3E%3Ctitle%3EArtboard 1icon-2%3C/title%3E%3Cg opacity='0.9'%3E%3Ccircle cx='24' cy='24' r='24'/%3E%3C/g%3E%3Crect x='23' y='14' width='2' height='20' transform='translate(48) rotate(90)' fill='%23fff'/%3E%3C/svg%3E") 24 24, zoom-out; cursor: -webkit-image-set(url("data:image/png;base64,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") 1x, url("data:image/png;base64,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") 2x) 24 24, zoom-out; } img { width: 100%; vertical-align: top; }.zoom-img { float: left; }.zoom-img img { border-radius: 6px; }.zoom-img >.zoom100 img, .zoom-img >.zoom50 img { border-radius: 0px; }

 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <:--This works--> <div class="zoom-img"> <div class="zoom0 bla"> <img src="https.//img.lemde.fr/2022/09/27/468/0/2800/1400/1600/800/60/0/4a83504_1664286495065-113206:jpg"> </div></div> <.--This does not--> <div class="zoom-img"> <div class="zoom0 bla"> <img src="https.//img.lemde.fr/2022/09/27/468/0/2800/1400/1600/800/60/0/4a83504_1664286495065-113206.jpg"> </div></div>