我有一个项目，用户从列表中选择一个项目(从 MySQL 数据库获取)，然后输出从该项目命名的按钮 像这样:
到目前为止我的(精简的)代码:
<!DOCTYPE html>
<html>
</head>
<body>
<h2>Select User:</h2>
<div>
<form method="POST">
<table border="5">
<thead>
<th></th>
<th>Subject</th>
</thead>
<tbody>
<?php
include('get.php');
$query=mysqli_query($conn,"select * from `subjects`");
while($row=mysqli_fetch_array($query)){
?>
<tr>
<td><input type="checkbox" value="<?php echo $row['subject']; ?>" name="id[]"></td>
<td><?php echo $row['subject']; ?></td>
</tr>
<?php
}
?>
</tbody>
</table>
<br>
<input type="submit" name="submit" value="Submit">
</form>
</div>
<div>
<h2>Subjects selected:</h2>
<?php
if (isset($_POST['submit'])){
foreach ($_POST['id'] as $id):
$sq=mysqli_query($conn,"select * from `subjects` where subject='$id'");
$srow=mysqli_fetch_array($sq);
?>
<button class="button animate" id="myBtn">
<span>
<?php echo $srow['subject']; ?>
</span>
</button>
<?php
endforeach;
}
?>
</div>
<div id="myModal" class="modal">
<div class="modal-content">
<span class="close">×</span>
<p>Some text in the Modal..</p>
</div>
<script>
var modal = document.getElementById("myModal");
var btn = document.getElementById("myBtn");
var span = document.getElementsByClassName("close")[0];
btn.onclick = function() {
modal.style.display = "block";
}
span.onclick = function() {
modal.style.display = "none";
}
window.onclick = function(event) {
if (event.target == modal) {
modal.style.display = "none";
}
}
</script>
我能够为一个按钮制作一个模态，但我想为每个按钮制作一个独特的模态。我怎样才能做到这一点？谢谢。
最佳答案
编写一个函数来为您构建一个模式。让此函数接受一些输入，例如您要显示的模式的内容。然后将模态添加到页面。这样您就可以根据您单击的按钮生成无限数量的不同模态。
我在下面做了一个例子来演示这是如何工作的。该示例使用与示例相同的结构构建模式，并使用按钮的 value 属性设置该模式的内容。对于简单文本，此方法效果很好，但对于大块 HTML，您可能会考虑从隐藏元素获取内容并复制该元素的 innerHTML 值。
// Flag for checking if a modal is already opened.
// This way we can keep track of the opened modal and
// not open a second one before closing the first.
let modalOpen = false;
function createModal(html = '') {
// Create the elements.
const modal = document.createElement('div');
const content = document.createElement('div');
const close = document.createElement('span');
// Add classes to the elements.
modal.classList.add('modal');
content.classList.add('modal-content');
close.classList.add('close', 'js-close-modal');
// Add content to the elements.
content.insertAdjacentHTML('beforeend', html);
close.innerHTML = '×';
// Append children to parents and to the document.
content.appendChild(close);
modal.appendChild(content);
document.body.appendChild(modal);
return modal;
}
// Listen for clicks in the document.
document.addEventListener('click', event => {
// If the create modal button has been clicked, create a modal.
const button = event.target.closest('.js-create-modal');
if (button !== null && modalOpen === false) {
const html = button.value;
createModal(html);
modalOpen = true;
}
// If the close modal has been clicked, remove the modal.
const close = event.target.closest('.js-close-modal');
if (close !== null) {
const modal = close.closest('.modal');
modal.remove();
modalOpen = false;
}
});*, *::before, *::after {
box-sizing: border-box;
}
.modal {
display: block;
position: fixed;
top: 50%;
left: 50%;
width: 100%;
height: 90%;
max-width: 32em;
max-height: 48em;
box-shadow: 0 0 20px 0 rgba(0, 0, 0, 0.25);
padding: 15px;
transform: translate(-50%, -50%);
background: #ffffff;
border: 1px solid #d0d0d0;
border-radius: 5px;
z-index: 99;
}
.modal-content {
padding: 15px;
}
.close {
position: absolute;
top: 15px;
right: 15px;
cursor: pointer;
}<button class="js-create-modal" value="This is my first modal.">Modal 1</button>
<button class="js-create-modal" value="All the modals have their own content.">Modal 2</button>
<button class="js-create-modal" value="And are unique in every way.">Modal 3</button>另一种方法是在页面上有一个模式，您可以显示和隐藏它。每当您单击按钮时，您都应该根据您单击的按钮修改模式的内容。这样你只需要修改一个部分。但是，嘿，如果模式是隐藏的，为什么不将其删除并在需要时构建一个新模式呢？您的选择。
关于javascript - 为 php 中的每个元素生成唯一的模态，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/60341638/