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javascript - 在javascript中滚动时放大缩小图像

转载 作者:行者123 更新时间:2023-11-30 19:41:24 28 4
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我用图像创建了标签。当我在图像上滚动时,它会放大和缩小。但我遇到了问题,仅在第一个选项卡中它使用放大和缩小功能(当我滚动时)。我没有明白我做错了什么。

index.html

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>zoom</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script>
<style type="text/css">
ul li{
padding: 10px;
}
</style>
</head>
<body>
<div class="container">
<div class="row">
<div class="col-md-6 col-md-offset-3">
<div class="panel panel-primary">
<div class="panel-heading">
<h3 class="panel-title">Panel title</h3>
<span class="pull-right">
<!-- Tabs -->
<ul class="nav panel-tabs">
<li class="active"><a href="#tab1" data-toggle="tab">Tab 1</a></li>
<li><a href="#tab2" data-toggle="tab">Tab 2</a></li>
<li><a href="#tab3" data-toggle="tab">Tab 3</a></li>
<li><a href="#tab4" data-toggle="tab">Tab 4</a></li>
</ul>
</span>
</div>
<div class="panel-body">
<br />
<br />
<div class="tab-content">
<div class="tab-pane active" id="tab1">
<div class="container">
<div class="slide">
<img class='zoom' src='daisy.jpg' alt='Daisy!' width='555' height='320'/>
</div>
</div>
<br />
<!-- <input type="button" value="click me"> -->
</div>
<div class="tab-pane" id="tab2">
<div class="container">
<div class="slide">
<img class='zoom' src='abc.jpg' alt='abc' width='555' height='320'/>
</div>
</div>
<br />
<!-- <input type="button" value="click me"> -->
</div>
<div class="tab-pane" id="tab3">
<div class="container">
<div class="slide">
<img class='zoom' src='xy.jpg' alt='xy' width='555' height='320'/>
</div>
</div>
<br />
<!-- <input type="button" value="click me"> -->
</div>
<div class="tab-pane" id="tab4">
<div class="container">
<div class="slide">
<img class='zoom' src='rec.png' alt='rec' width='555' height='320'/>
</div>
</div>
<br />
<!-- <input type="button" value="click me"> -->
</div>

</div>
</div>
</div>
</div>
</div>
</div>
<!-- <img class='zoom' src='daisy.jpg' alt='Daisy!' width='555' height='320'/>
<br />
<img class='zoom' src='daisy.jpg' alt='Daisy!' width='555' height='320'/> -->
<script src="wheelzoom.js"></script>
<script>
wheelzoom(document.querySelector('img.zoom'));
</script>
</body>
</html>

wheelzoom.js

window.wheelzoom = (function(){
var defaults = {
zoom: 0.10,
maxZoom: false,
initialZoom: 1,
};

var main = function(img, options){
if (!img || !img.nodeName || img.nodeName !== 'IMG') { return; }

var settings = {};
var width;
var height;
var bgWidth;
var bgHeight;
var bgPosX;
var bgPosY;
var previousEvent;
var cachedDataUrl;

function setSrcToBackground(img) {
img.style.backgroundRepeat = 'no-repeat';
img.style.backgroundImage = 'url("'+img.src+'")';
cachedDataUrl = 'data:image/svg+xml;base64,'+window.btoa('<svg xmlns="http://www.w3.org/2000/svg" width="'+img.naturalWidth+'" height="'+img.naturalHeight+'"></svg>');
img.src = cachedDataUrl;
}

function updateBgStyle() {
if (bgPosX > 0) {
bgPosX = 0;
} else if (bgPosX < width - bgWidth) {
bgPosX = width - bgWidth;
}

if (bgPosY > 0) {
bgPosY = 0;
} else if (bgPosY < height - bgHeight) {
bgPosY = height - bgHeight;
}

img.style.backgroundSize = bgWidth+'px '+bgHeight+'px';
img.style.backgroundPosition = bgPosX+'px '+bgPosY+'px';
}

function reset() {
bgWidth = width;
bgHeight = height;
bgPosX = bgPosY = 0;
updateBgStyle();
}

function onwheel(e) {
var deltaY = 0;

e.preventDefault();

if (e.deltaY) { // FireFox 17+ (IE9+, Chrome 31+?)
deltaY = e.deltaY;
} else if (e.wheelDelta) {
deltaY = -e.wheelDelta;
}

// As far as I know, there is no good cross-browser way to get the cursor position relative to the event target.
// We have to calculate the target element's position relative to the document, and subtrack that from the
// cursor's position relative to the document.
var rect = img.getBoundingClientRect();
var offsetX = e.pageX - rect.left - window.pageXOffset;
var offsetY = e.pageY - rect.top - window.pageYOffset;

// Record the offset between the bg edge and cursor:
var bgCursorX = offsetX - bgPosX;
var bgCursorY = offsetY - bgPosY;

// Use the previous offset to get the percent offset between the bg edge and cursor:
var bgRatioX = bgCursorX/bgWidth;
var bgRatioY = bgCursorY/bgHeight;

// Update the bg size:
if (deltaY < 0) {
bgWidth += bgWidth*settings.zoom;
bgHeight += bgHeight*settings.zoom;
} else {
bgWidth -= bgWidth*settings.zoom;
bgHeight -= bgHeight*settings.zoom;
}

if (settings.maxZoom) {
bgWidth = Math.min(width*settings.maxZoom, bgWidth);
bgHeight = Math.min(height*settings.maxZoom, bgHeight);
}

// Take the percent offset and apply it to the new size:
bgPosX = offsetX - (bgWidth * bgRatioX);
bgPosY = offsetY - (bgHeight * bgRatioY);

// Prevent zooming out beyond the starting size
if (bgWidth <= width || bgHeight <= height) {
reset();
} else {
updateBgStyle();
}
}

function drag(e) {
e.preventDefault();
bgPosX += (e.pageX - previousEvent.pageX);
bgPosY += (e.pageY - previousEvent.pageY);
previousEvent = e;
updateBgStyle();
}

function removeDrag() {
document.removeEventListener('mouseup', removeDrag);
document.removeEventListener('mousemove', drag);
}

// Make the background draggable
function draggable(e) {
e.preventDefault();
previousEvent = e;
document.addEventListener('mousemove', drag);
document.addEventListener('mouseup', removeDrag);
}

function load() {
var initial = Math.max(settings.initialZoom, 1);

if (img.src === cachedDataUrl) return;

var computedStyle = window.getComputedStyle(img, null);

width = parseInt(computedStyle.width, 10);
height = parseInt(computedStyle.height, 10);
bgWidth = width * initial;
bgHeight = height * initial;
bgPosX = -(bgWidth - width)/2;
bgPosY = -(bgHeight - height)/2;;

setSrcToBackground(img);

img.style.backgroundSize = bgWidth+'px '+bgHeight+'px';
img.style.backgroundPosition = bgPosX+'px '+bgPosY+'px';
img.addEventListener('wheelzoom.reset', reset);

img.addEventListener('wheel', onwheel);
img.addEventListener('mousedown', draggable);
}

var destroy = function (originalProperties) {
img.removeEventListener('wheelzoom.destroy', destroy);
img.removeEventListener('wheelzoom.reset', reset);
img.removeEventListener('load', load);
img.removeEventListener('mouseup', removeDrag);
img.removeEventListener('mousemove', drag);
img.removeEventListener('mousedown', draggable);
img.removeEventListener('wheel', onwheel);

img.style.backgroundImage = originalProperties.backgroundImage;
img.style.backgroundRepeat = originalProperties.backgroundRepeat;
img.src = originalProperties.src;
}.bind(null, {
backgroundImage: img.style.backgroundImage,
backgroundRepeat: img.style.backgroundRepeat,
src: img.src
});

img.addEventListener('wheelzoom.destroy', destroy);

options = options || {};

Object.keys(defaults).forEach(function(key){
settings[key] = options[key] !== undefined ? options[key] : defaults[key];
});

if (img.complete) {
load();
}

img.addEventListener('load', load);
};

// Do nothing in IE9 or below
if (typeof window.btoa !== 'function') {
return function(elements) {
return elements;
};
} else {
return function(elements, options) {
if (elements && elements.length) {
Array.prototype.forEach.call(elements, main, options);
} else if (elements && elements.nodeName) {
main(elements, options);
}
return elements;
};
}
}());

当我滚动时,它会放大和缩小,但仅限于第一个选项卡。我做错了什么,我无法理解。请帮助我。谢谢。

最佳答案

干得好,我解决了这个问题,发现您正在使用 wheelzoom(document.querySelector('img.zoom')); 在此代码中,您正在使用 querySelector 如果此代码将仅返回一个元素而不是所有元素,而不是此代码,您需要使用 wheelzoom(document.querySelectorAll('img.zoom')); 然后您的示例将起作用。我已经尝试过并且有效

关于javascript - 在javascript中滚动时放大缩小图像,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/55350722/

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