javascript - 使用 JavaScript 动态构建页面
问题描述
我有 2 张 HTML 图像。
我想在每个图像下在 JavaScript 中动态添加一个按钮,单击该按钮以隐藏图像,然后再次单击以再次显示该图像。
这个想法是使用:
- 查询选择器全部
- 循环
- createElement(按钮)到按钮
- 添加 addEventListener
- 附加孩子
代码:
<h2>Create a new site</h2>
<p>Site – Manage Sites - New:</p>
<dd><img class="screenshot" width="238" height="222" src="https://picsum.photos/200" alt="screenshot" /></dd>
<p>“What would you like to call the website?”</p>
<dd><img class="screenshot" width="238" height="222" src="https://picsum.photos/300" alt="screenshot" /></dd>
img.screenshot {
margin-bottom: 20px;
margin-top: 20px;
}
.btn-styled {
font-size: 14px;
margin: 10px;
padding: 0 5px;
line-height: 2;
}
var eScreens = document.querySelectorAll('img.screenshot');
for (var i = 0; i <= eScreens.length; i++) {
var button = document.createElement("button");
button.id = "myButton";
button.innerHTML = "Show";
button.className = "btn-styled";
button.style.background = "orange";
button.addEventListener("click", function() {
});
var dd = document.getElementsByTagName("dd")[0];
dd.appendChild(button);
}
解决方案
我会将每个图像包装在一个figure
元素中,以便每个图像都包含一个图像,当你添加它时,一个按钮。
// Cache the figures
const figures = document.querySelectorAll('figure');
// For each add a button, and attach an event listener
figures.forEach(figure => {
addButton(figure);
figure.addEventListener('click', handleClick, false);
});
// Create a button, and add it to the end of
// each figure element
function addButton(figure) {
const button = '<button>Hide</button>';
figure.insertAdjacentHTML('beforeend', button);
}
// Because the listener is attached to the figure
// we need to check if the element we clicked was the
// button. We can then get the image, and then
// use a class to toggle its visibility
// and update the text in the button
function handleClick(e) {
const { nodeName, parentNode, textContent } = e.target;
if (nodeName === 'BUTTON') {
const image = parentNode.querySelector('img');
image.classList.toggle('hide');
e.target.textContent = textContent === 'Hide'
? 'Show'
: 'Hide';
}
}
figure { display: inline-block; margin: 0; }
button { display: block; margin: 0 auto; }
.hide { visibility: hidden; }
<figure>
<img src="https://dummyimage.com/100x100/ffaaaa/000" />
</figure>
<figure>
<img src="https://dummyimage.com/100x100/aaffaa/000" />
</figure>
<figure>
<img src="https://dummyimage.com/100x100/aaaaff/000" />
</figure>