javascript - 需要帮助实现 EasyZoom jquery 插件
问题描述
一般来说，我对 jquery 和 javascript 不太熟悉，所以请耐心等待。但是，我正在尝试使用 EasyZoom 创建一个在悬停时缩放的图片库：https ://i-like-robots.github.io/EasyZoom/ 。我想实现类似于链接中“带有缩略图”的内容。
到目前为止，我已经创建了包含图像的 div，从 GitHub 复制了 CSS 和 javascript 文件，并将我的 HTML 页面链接到它们，请参见下面的具体代码。
但是，我显然在这里遗漏了一些东西。在 JS 文件中，我找到了一个地方，它说@param {Object} target我应该在 HTML 中指定需要 Easyzoom 的对象吗？如果是这样，怎么做？我也很困惑如何指定我想要一个带有 Easyzoom 的图片库。所以，如果有人能帮我解决这个问题，那就太好了。
HTML 代码 （我有一个从 Django 模型中获得的图像链接列表，位于“图像”下）
{% for image in images %}
<div class="slides">
<div class="easyzoom">
<a href="{{image}}">
<img src="{{image}}">
</a>
</div>
</div>
{% endfor %}
Easyzoom.css
/**
* EasyZoom core styles
*/
.easyzoom {
position: relative;
/* 'Shrink-wrap' the element */
display: inline-block;
*display: inline;
*zoom: 1;
}
.easyzoom img {
vertical-align: bottom;
}
.easyzoom.is-loading img {
cursor: progress;
}
.easyzoom.is-ready img {
cursor: crosshair;
}
.easyzoom.is-error img {
cursor: not-allowed;
}
.easyzoom-notice {
position: absolute;
top: 50%;
left: 50%;
z-index: 150;
width: 10em;
margin: -1em 0 0 -5em;
line-height: 2em;
text-align: center;
background: #FFF;
box-shadow: 0 0 10px #888;
}
.easyzoom-flyout {
position:absolute;
z-index: 100;
overflow: hidden;
background: #FFF;
}
Easyzoom.js
(function (root, factory) {
'use strict';
if(typeof define === 'function' && define.amd) {
define(['jquery'], function($){
factory($);
});
} else if(typeof module === 'object' && module.exports) {
module.exports = (root.EasyZoom = factory(require('jquery')));
} else {
root.EasyZoom = factory(root.jQuery);
}
}(this, function ($) {
'use strict';
var zoomImgOverlapX;
var zoomImgOverlapY;
var ratioX;
var ratioY;
var pointerPositionX;
var pointerPositionY;
var defaults = {
// The text to display within the notice box while loading the zoom image.
loadingNotice: 'Loading image',
// The text to display within the notice box if an error occurs when loading the zoom image.
errorNotice: 'The image could not be loaded',
// The time (in milliseconds) to display the error notice.
errorDuration: 2500,
// Attribute to retrieve the zoom image URL from.
linkAttribute: 'href',
// Prevent clicks on the zoom image link.
preventClicks: true,
// Callback function to execute before the flyout is displayed.
beforeShow: $.noop,
// Callback function to execute before the flyout is removed.
beforeHide: $.noop,
// Callback function to execute when the flyout is displayed.
onShow: $.noop,
// Callback function to execute when the flyout is removed.
onHide: $.noop,
// Callback function to execute when the cursor is moved while over the image.
onMove: $.noop
};
/**
* EasyZoom
* @constructor
* @param {Object} target
* @param {Object} options (Optional)
*/
function EasyZoom(target, options) {
this.$target = $(target);
this.opts = $.extend({}, defaults, options, this.$target.data());
this.isOpen === undefined && this._init();
}
/**
* Init
* @private
*/
EasyZoom.prototype._init = function() {
this.$link = this.$target.find('a');
this.$image = this.$target.find('img');
this.$flyout = $('<div class="easyzoom-flyout" />');
this.$notice = $('<div class="easyzoom-notice" />');
this.$target.on({
'mousemove.easyzoom touchmove.easyzoom': $.proxy(this._onMove, this),
'mouseleave.easyzoom touchend.easyzoom': $.proxy(this._onLeave, this),
'mouseenter.easyzoom touchstart.easyzoom': $.proxy(this._onEnter, this)
});
this.opts.preventClicks && this.$target.on('click.easyzoom', function(e) {
e.preventDefault();
});
};
/**
* Show
* @param {MouseEvent|TouchEvent} e
* @param {Boolean} testMouseOver (Optional)
*/
EasyZoom.prototype.show = function(e, testMouseOver) {
var self = this;
if (this.opts.beforeShow.call(this) === false) return;
if (!this.isReady) {
return this._loadImage(this.$link.attr(this.opts.linkAttribute), function() {
if (self.isMouseOver || !testMouseOver) {
self.show(e);
}
});
}
this.$target.append(this.$flyout);
var targetWidth = this.$target.outerWidth();
var targetHeight = this.$target.outerHeight();
var flyoutInnerWidth = this.$flyout.width();
var flyoutInnerHeight = this.$flyout.height();
var zoomImgWidth = this.$zoom.width();
var zoomImgHeight = this.$zoom.height();
zoomImgOverlapX = Math.ceil(zoomImgWidth - flyoutInnerWidth);
zoomImgOverlapY = Math.ceil(zoomImgHeight - flyoutInnerHeight);
// For when the zoom image is smaller than the flyout element.
if (zoomImgOverlapX < 0) zoomImgOverlapX = 0;
if (zoomImgOverlapY < 0) zoomImgOverlapY = 0;
ratioX = zoomImgOverlapX / targetWidth;
ratioY = zoomImgOverlapY / targetHeight;
this.isOpen = true;
this.opts.onShow.call(this);
e && this._move(e);
};
/**
* On enter
* @private
* @param {Event} e
*/
EasyZoom.prototype._onEnter = function(e) {
var touches = e.originalEvent.touches;
this.isMouseOver = true;
if (!touches || touches.length == 1) {
e.preventDefault();
this.show(e, true);
}
};
/**
* On move
* @private
* @param {Event} e
*/
EasyZoom.prototype._onMove = function(e) {
if (!this.isOpen) return;
e.preventDefault();
this._move(e);
};
/**
* On leave
* @private
*/
EasyZoom.prototype._onLeave = function() {
this.isMouseOver = false;
this.isOpen && this.hide();
};
/**
* On load
* @private
* @param {Event} e
*/
EasyZoom.prototype._onLoad = function(e) {
// IE may fire a load event even on error so test the image dimensions
if (!e.currentTarget.width) return;
this.isReady = true;
this.$notice.detach();
this.$flyout.html(this.$zoom);
this.$target.removeClass('is-loading').addClass('is-ready');
e.data.call && e.data();
};
/**
* On error
* @private
*/
EasyZoom.prototype._onError = function() {
var self = this;
this.$notice.text(this.opts.errorNotice);
this.$target.removeClass('is-loading').addClass('is-error');
this.detachNotice = setTimeout(function() {
self.$notice.detach();
self.detachNotice = null;
}, this.opts.errorDuration);
};
/**
* Load image
* @private
* @param {String} href
* @param {Function} callback
*/
EasyZoom.prototype._loadImage = function(href, callback) {
var zoom = new Image();
this.$target
.addClass('is-loading')
.append(this.$notice.text(this.opts.loadingNotice));
this.$zoom = $(zoom)
.on('error', $.proxy(this._onError, this))
.on('load', callback, $.proxy(this._onLoad, this));
zoom.style.position = 'absolute';
zoom.src = href;
};
/**
* Move
* @private
* @param {Event} e
*/
EasyZoom.prototype._move = function(e) {
if (e.type.indexOf('touch') === 0) {
var touchlist = e.touches || e.originalEvent.touches;
pointerPositionX = touchlist[0].pageX;
pointerPositionY = touchlist[0].pageY;
} else {
pointerPositionX = e.pageX || pointerPositionX;
pointerPositionY = e.pageY || pointerPositionY;
}
var targetOffset = this.$target.offset();
var relativePositionX = pointerPositionX - targetOffset.left;
var relativePositionY = pointerPositionY - targetOffset.top;
var moveX = Math.ceil(relativePositionX * ratioX);
var moveY = Math.ceil(relativePositionY * ratioY);
// Close if outside
if (moveX < 0 || moveY < 0 || moveX > zoomImgOverlapX || moveY > zoomImgOverlapY) {
this.hide();
} else {
var top = moveY * -1;
var left = moveX * -1;
this.$zoom.css({
top: top,
left: left
});
this.opts.onMove.call(this, top, left);
}
};
/**
* Hide
*/
EasyZoom.prototype.hide = function() {
if (!this.isOpen) return;
if (this.opts.beforeHide.call(this) === false) return;
this.$flyout.detach();
this.isOpen = false;
this.opts.onHide.call(this);
};
/**
* Swap
* @param {String} standardSrc
* @param {String} zoomHref
* @param {String|Array} srcset (Optional)
*/
EasyZoom.prototype.swap = function(standardSrc, zoomHref, srcset) {
this.hide();
this.isReady = false;
this.detachNotice && clearTimeout(this.detachNotice);
this.$notice.parent().length && this.$notice.detach();
this.$target.removeClass('is-loading is-ready is-error');
this.$image.attr({
src: standardSrc,
srcset: $.isArray(srcset) ? srcset.join() : srcset
});
this.$link.attr(this.opts.linkAttribute, zoomHref);
};
/**
* Teardown
*/
EasyZoom.prototype.teardown = function() {
this.hide();
this.$target
.off('.easyzoom')
.removeClass('is-loading is-ready is-error');
this.detachNotice && clearTimeout(this.detachNotice);
delete this.$link;
delete this.$zoom;
delete this.$image;
delete this.$notice;
delete this.$flyout;
delete this.isOpen;
delete this.isReady;
};
// jQuery plugin wrapper
$.fn.easyZoom = function(options) {
return this.each(function() {
var api = $.data(this, 'easyZoom');
if (!api) {
$.data(this, 'easyZoom', new EasyZoom(this, options));
} else if (api.isOpen === undefined) {
api._init();
}
});
};
return EasyZoom;
}));
js 和 CSS 文件基本上是 Github 上的内容的精确副本：https ://github.com/i-like-robots/EasyZoom
解决方案
由于您已经在使用 jQuery，如何为您的滑块使用Slick并将EasyZoom集成到您的 slick 幻灯片中？
大量很酷的功能，检查一下... https://kenwheeler.github.io/slick/
我们可以利用slick 的点将点按钮操作为图像缩略图，因此您的原始标记中没有额外的 html
在下面的工作示例和 jsfiddle 中阅读我的评论。
请注意，easyzoom 不会放大太多，因为我们使用的演示图像本身只有 600 像素宽。
jsFiddle 版本... https://jsfiddle.net/joshmoto/mdkpnw7g/
工作堆栈示例...
// document ready
$(document).ready(function() {
// init ez-slider with slick
$('.ez-slider').on('init', function(slick) {
// slide var for use timeout
const slider = this;
// slight delay so slick init completes render
setTimeout(function() {
// init the easy zoom on slider
$('FIGURE', slider).addClass('easyzoom').easyZoom();
// thumb buttons
let thumbs = $('.slick-dots > LI > BUTTON', slider);
// each thumbnail button function
$.each(thumbs, function(i, e) {
// slide id
let slide_id = $(this).attr('aria-controls');
// get thumbnail image src
let thumb_img = $('#' + slide_id).find('IMG').attr('src');
// change thumb button inner html too
$(this).html('<img src="' + thumb_img + '" alt="" />');
});
}, 100);
// then our slick options
}).slick({
slidesToShow: 1,
slidesToScroll: 1,
dots: true,
arrows: false,
adaptiveHeight: true,
autoplay: false
});
});BODY {
margin: 0;
padding: 20px;
}
/* The minor fix I added to get demo working */
.ez-slider .easyzoom .easyzoom-flyout {
top: 0;
left: 0;
right: 0;
bottom: 0;
}
/* Slide demo css not needed */
.ez-slider {
max-width: 400px;
margin: 0 auto 20px auto !important;
}
.ez-slider FIGURE {
margin: 0;
display: block;
position: relative;
overflow: hidden;
}
.ez-slider FIGURE > A {
height: auto;
display: block;
width: 100%;
}
.ez-slider FIGURE > A > IMG {
height: auto;
width: 100%;
display: block;
}
.ez-slider .slick-dots {
margin: 10px -5px 0 -5px;
position: relative;
bottom: 0;
width: auto;
display: block;
}
.ez-slider .slick-dots LI {
width: calc(20% - 10px);
height: auto;
margin: 0 0 10px 0;
padding: 0 5px 0 5px;
display: inline-block;
}
.ez-slider .slick-dots LI.slick-active BUTTON,
.ez-slider .slick-dots LI:hover BUTTON {
opacity: 1;
}
.ez-slider .slick-dots LI BUTTON {
overflow: hidden;
position: relative;
height: auto;
padding: 0;
transition: all .5s ease;
width: 100%;
opacity: .8;
}
.ez-slider .slick-dots LI BUTTON IMG {
display: block;
height: 100%;
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%,-50%);
}
.ez-slider .slick-dots LI BUTTON:before {
display: block;
position: relative;
content: '';
width: 100%;
padding-top: 100%;
height: auto;
}<!-- space slider html -->
<div class="ez-slider">
<figure>
<a href="https://i.imgur.com/q5Y5RCH.png">
<img src="https://i.imgur.com/q5Y5RCH.png" alt="" />
</a>
</figure>
<figure>
<a href="https://i.imgur.com/8HjXPXD.png">
<img src="https://i.imgur.com/8HjXPXD.png" alt="" />
</a>
</figure>
<figure>
<a href="https://i.imgur.com/vUDcfcy.png">
<img src="https://i.imgur.com/vUDcfcy.png" alt="" />
</a>
</figure>
<figure>
<a href="https://i.imgur.com/okTDHas.png">
<img src="https://i.imgur.com/okTDHas.png" alt="" />
</a>
</figure>
</div>
<!-- ocean slider html -->
<div class="ez-slider">
<figure>
<a href="https://i.imgur.com/x7ZYW4i.png">
<img src="https://i.imgur.com/x7ZYW4i.png" alt="" />
</a>
</figure>
<figure>
<a href="https://i.imgur.com/EYTCssm.png">
<img src="https://i.imgur.com/EYTCssm.png" alt="" />
</a>
</figure>
<figure>
<a href="https://i.imgur.com/3sAFPmL.png">
<img src="https://i.imgur.com/3sAFPmL.png" alt="" />
</a>
</figure>
</div>
<!-- landscape slider html -->
<div class="ez-slider">
<figure>
<a href="https://i.imgur.com/IqLrd0o.png">
<img src="https://i.imgur.com/IqLrd0o.png" alt="" />
</a>
</figure>
<figure>
<a href="https://i.imgur.com/6JplNl6.png">
<img src="https://i.imgur.com/6JplNl6.png" alt="" />
</a>
</figure>
<figure>
<a href="https://i.imgur.com/6X5GKWJ.png">
<img src="https://i.imgur.com/6X5GKWJ.png" alt="" />
</a>
</figure>
<figure>
<a href="https://i.imgur.com/SefTwI1.png">
<img src="https://i.imgur.com/SefTwI1.png" alt="" />
</a>
</figure>
<figure>
<a href="https://i.imgur.com/qBmDrTU.png">
<img src="https://i.imgur.com/qBmDrTU.png" alt="" />
</a>
</figure>
</div>
<!-- Include Slick CSS library -->
<link href="https://cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.8.1/slick.min.css" rel="stylesheet"/>
<!-- Include Slick Theme CSS library -->
<link href="https://cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.8.1/slick-theme.min.css" rel="stylesheet"/>
<!-- Include EasyZoom CSS library -->
<link href="https://cdn.jsdelivr.net/npm/easyzoom@2.5.3/css/easyzoom.css" rel="stylesheet"/>
<!-- Include jQuery library -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<!-- Include Slick JS library after jQuery -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.8.1/slick.min.js"></script>
<!-- Include EasyZoom JS library after jQuery -->
<script src="https://cdn.jsdelivr.net/npm/easyzoom@2.5.3/src/easyzoom.js"></script>
<!-- Make sure you run all your custom JS after libraries -->推荐阅读
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