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如何使用 Javascript 进行图像缩放

[英]How to make an Image Zoom with Javascript

 原文  2017-05-29 11:51:18  5   5    javascript/ html/ css

问题描述

我正在做一个网络项目，需要制作一个图片库。 单击时需要放大图像。 但是我的代码只有第一张图像缩放。

我怎样才能让它们全部缩放下面是我的源代码。

<!DOCTYPE html>
<html>
<head>
<style>
#myImg {
    border-radius: 5px;
    cursor: pointer;
    transition: 0.3s;
}

#myImg:hover {opacity: 0.7;}
.modal {
    display: none; /* Hidden by default */
    position: fixed; /* Stay in place */
    z-index: 1; /* Sit on top */
    padding-top: 100px; /* Location of the box */
    left: 0;
    top: 0;
    width: 100%; /* Full width */
    height: 100%; /* Full height */
    overflow: auto; /* Enable scroll if needed */
    background-color: rgb(0,0,0); /* Fallback color */
    background-color: rgba(0,0,0,0.9); /* Black w/ opacity */
}

/* Modal Content (image) */
.modal-content {
    margin: auto;
    display: block;
    width: 80%;
    max-width: 700px;
}

/* Caption of Modal Image */
#caption {
    margin: auto;
    display: block;
    width: 80%;
    max-width: 700px;
    text-align: center;
    color: #ccc;
    padding: 10px 0;
    height: 150px;
}

/* Add Animation */
.modal-content, #caption {    
    -webkit-animation-name: zoom;
    -webkit-animation-duration: 0.6s;
    animation-name: zoom;
    animation-duration: 0.6s;
}

@-webkit-keyframes zoom {
    from {-webkit-transform:scale(0)} 
    to {-webkit-transform:scale(1)}
}

@keyframes zoom {
    from {transform:scale(0)} 
    to {transform:scale(1)}
}

.close {
    position: absolute;
    top: 15px;
    right: 35px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
    transition: 0.3s;
}

.close:hover,
.close:focus {
    color: #bbb;
    text-decoration: none;
    cursor: pointer;
}

@media only screen and (max-width: 700px){
    .modal-content {
        width: 100%;
    }
}
</style>
</head>
<body>

<img id="myImg" src="img_fjords.jpg" alt="Trolltunga, Norway" width="300" height="200">
<img id="myImg" src="img_fjords.jpg" alt="Trolltunga, Norway" width="300" height="200">

<!-- The Modal -->
<div id="myModal" class="modal">
  <span class="close" id="close">&times;</span>
  <img class="modal-content" id="img01">
  <div id="caption"></div>
</div>

<script>
// Get the modal
var modal = document.getElementById('myModal');

// Get the image and insert it inside the modal - use its "alt" text as a caption
var img = document.getElementById('myImg');
var modalImg = document.getElementById("img01");
var captionText = document.getElementById("caption");
 function openModal(){
    modal.style.display = "block";
    modalImg.src = this.src;
    captionText.innerHTML = this.alt;
}

// Get the <span> element that closes the modal
var span = document.getElementById('close');

// When the user clicks on <span> (x), close the modal
 function close() { 
    modal.style.display = "none";
}
span.addEventListener("click", close);
img.addEventListener("click", openModal);
</script>

</body>
</html>

5 个解决方案

解决方案1
 2  2017-05-29 11:56:01

id名称在整个网页中必须是唯一的。 否则，选择器将只在第一个上工作。

为了让选择器在多个元素上工作， classes是发明的。 您应该将代码更改为：

[...]
<img id="myImg1" class="myImg" src="img_fjords.jpg" alt="Trolltunga, Norway" width="300" height="200">
<img id="myImg2" class="myImg" src="img_fjords.jpg" alt="Trolltunga, Norway" width="300" height="200">
[...]

CSS：

[...]
.myImg {
     border-radius: 5px;
    cursor: pointer;
    transition: 0.3s;
}

.myImg:hover {opacity: 0.7;}
.modal {
    display: none; /* Hidden by default */
    position: fixed; /* Stay in place */
    z-index: 1; /* Sit on top */
    padding-top: 100px; /* Location of the box */
    left: 0;
    top: 0;
    width: 100%; /* Full width */
    height: 100%; /* Full height */
    overflow: auto; /* Enable scroll if needed */
    background-color: rgb(0,0,0); /* Fallback color */
    background-color: rgba(0,0,0,0.9); /* Black w/ opacity */
}
[...]

请注意我如何更改点 ( . ) 的哈希 ( # )。

Hash 表示按 id 选择，点表示按类选择。 你应该对所有事情都遵循同样的原则。 ID when 将是唯一的，而 class when 是多个。

现在我们将在 JS 中按类进行选择：

/*[...]*/
// Select all the images by class
var imgs = document.querySelectorAll('.myImg');

// Loop the array and add the logic to each one
imgs.forEach(function(img) {
    img.addEventListener("click", openModal);
});
/*[...]*/

解决方案2
 0 已采纳  2017-05-29 11:55:58

不要使用 ID 使用类。 例如使用

.caption

而不是

#caption

解决方案3
 0  2017-05-29 11:56:42

您正在使用id进行 dom 单击。 Id 是唯一的。最好使用ClassName作为选择器而不是id尝试使用querySelectorAll()和forEach()为所有图像元素分配点击事件

 // Get the modal var modal = document.getElementById('myModal'); // Get the image and insert it inside the modal - use its "alt" text as a caption var img = document.querySelectorAll('.myImg'); var modalImg = document.getElementById("img01"); var captionText = document.getElementById("caption"); function openModal() { modal.style.display = "block"; modalImg.src = this.src; captionText.innerHTML = this.alt; } // Get the <span> element that closes the modal var span = document.getElementById('close'); // When the user clicks on <span> (x), close the modal function close() { modal.style.display = "none"; } span.addEventListener("click", close); img.forEach(a=> a.addEventListener("click", openModal));
 #myImg { border-radius: 5px; cursor: pointer; transition: 0.3s; } #myImg:hover { opacity: 0.7; } .modal { display: none; /* Hidden by default */ position: fixed; /* Stay in place */ z-index: 1; /* Sit on top */ padding-top: 100px; /* Location of the box */ left: 0; top: 0; width: 100%; /* Full width */ height: 100%; /* Full height */ overflow: auto; /* Enable scroll if needed */ background-color: rgb(0, 0, 0); /* Fallback color */ background-color: rgba(0, 0, 0, 0.9); /* Black w/ opacity */ } /* Modal Content (image) */ .modal-content { margin: auto; display: block; width: 80%; max-width: 700px; } /* Caption of Modal Image */ #caption { margin: auto; display: block; width: 80%; max-width: 700px; text-align: center; color: #ccc; padding: 10px 0; height: 150px; } /* Add Animation */ .modal-content, #caption { -webkit-animation-name: zoom; -webkit-animation-duration: 0.6s; animation-name: zoom; animation-duration: 0.6s; } @-webkit-keyframes zoom { from { -webkit-transform: scale(0) } to { -webkit-transform: scale(1) } } @keyframes zoom { from { transform: scale(0) } to { transform: scale(1) } } .close { position: absolute; top: 15px; right: 35px; color: #f1f1f1; font-size: 40px; font-weight: bold; transition: 0.3s; } .close:hover, .close:focus { color: #bbb; text-decoration: none; cursor: pointer; } @media only screen and (max-width: 700px) { .modal-content { width: 100%; } }
 <img id="myImg" class="myImg"src="img_fjords.jpg" alt="Trolltunga, Norway" width="300" height="200"> <img id="myImg" class="myImg" src="img_fjords.jpg" alt="Trolltunga, Norway" width="300" height="200"> <!-- The Modal --> <div id="myModal" class="modal"> <span class="close" id="close">&times;</span> <img class="modal-content" id="img01"> <div id="caption"></div> </div>

解决方案4
 0  2017-05-29 12:30:10

使用类而不是 id。 或者，您也可以通过内联添加事件。 

 //and your function will looks like: function openModal(element){ modal.style.display = "block"; modalImg.src = element.src; captionText.innerHTML = element.alt; } // and remove img.addEventListener("click", openModal);
 <img id="myImg" src="img_fjords.jpg" alt="Trolltunga, Norway" width="300" height="200" onclick="openModal(this)"> <img id="myImg" src="img_fjords.jpg" alt="Trolltunga, Norway" width="300" height="200" onclick="openModal(this)">

解决方案5
 0  2019-10-29 04:41:38

尝试这个

 // Get the Modal and modal-img let modal = document.querySelector("#myModal"); let modalImg = document.querySelector(".modal-img"); // Show Modal function showModal(elem) { modal.classList.remove("hide"); modalImg.setAttribute("src", elem.src); } // Hide Modal function hideModal() { modal.classList.add("hide"); } // Hide Modal when backdrop (black transparent area) is clicked modal.onclick = function (event) { if(event.target === modal) { hideModal(); } }
 * { box-sizing: border-box; font-family: sans-serif; } /* Style Modal Container */ .modal { position: absolute; top: 0; left: 0; width: 100%; height: 100%; display: -webkit-flex; -webkit-align-items: center; -webkit-justify-content: center; display: flex; align-items: center; justify-content: center; background-color: rgba(0, 0, 0, .6); overflow: auto; } .hide { display: none; } /* Style Modal Content */ .modal-content { width: 75%; height: 75%; -webkit-animation: .4s slide; animation: .4s slide; } /* Adding Animation */ @-webkit-keyframes slide { from { opacity: 0; -webkit-transform: translateY(-50px); transform: translateY(-50px); } to { opacity: 1; -webkit-transform: translateY(0); transform: translateY(0); } } @keyframes slide { from { opacity: 0; -webkit-transform: translateY(-50px); transform: translateY(-50px); } to { opacity: 1; -webkit-transform: translateY(0); transform: translateY(0); } } /* Style Modal Header */ .modal-header { display: -webkit-flex; -webkit-align-items: flex-start; -webkit-justify-content: space-between; display: flex; align-items: flex-start; justify-content: space-between; padding: 1rem 1rem; background-color: white; } /* Style Close Button */ .close { padding: 1rem 1rem; margin: -1rem -1rem -1rem auto; background-color: transparent; border: none; float: right; font-size: 1.5rem; font-weight: 700; color: #000; opacity: .5; cursor: pointer; } /* Style Modal Body */ .modal-body { position: relative; -webkit-flex: 1 1 auto; flex: 1 1 auto; } /* Style Modal Image */ .modal-img { width: 100%; height: auto; object-fit: cover; }
 <p>Click the Images below:</p> <!-- Image trigger Modal --> <img onclick="showModal(this)" src="https://parrot-tutorial.com/images/carousel_red3.jpg" style="width: 300px;"> <img onclick="showModal(this)" src="https://parrot-tutorial.com/images/air_ballon.jpg" style="width: 300px;"> <img onclick="showModal(this)" src="https://parrot-tutorial.com/images/nature_autumn.jpg" style="width: 300px;"> <!-- *************** Modal *************** --> <div class="modal hide" id="myModal" tabindex="-1"> <div class="modal-content"> <!-- Modal Header --> <div class="modal-header"> <button type="button" class="close" onclick="hideModal()">&times;</button> </div> <!-- Modal Body --> <div class="modal-body"> <img class="modal-img" src="/images/carousel_3.jpg"> </div> </div> </div>

参考：如何创建模态图像

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