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Working with Reusable Content Fragments Using the HTML template Tag
Working with Reusable Content Fragments Using the HTML template Tag
Jul 11, 2025 am 03:19 AM
The tag is a tag introduced by HTML5 to define reusable content fragments. It does not render immediately, but can be dynamically inserted in pages via JavaScript. The usage process includes: 1. Defining the template; 2. Cloning the content; 3. Inserting the DOM. For example, get the template through document.getElementById, call cloneNode(true) to clone and insert the page. When dynamically filling the data, content binding can be achieved by operating the cloned DOM elements, which is suitable for building product lists, user cards and other components. When using it, be careful not to directly access template sub-elements, avoid ID conflicts, handle style scopes, and create encapsulation components with Web Components.
In web development, reusing content fragments is a very common requirement. For example, navigation bar, footer, button components, etc. often need to be reused on multiple pages. If you copy and paste manually every time, it will not only be inefficient but also prone to errors. HTML provides a <template></template> tag that can help us achieve the management of "reusable content snippets".
What is the <template></template> tag?
<template></template> is a tag introduced in HTML5. It allows you to define a piece of content that will not be rendered immediately, but can be dynamically inserted into the page through JavaScript later. You can understand it as a "content container" that can contain a combination of HTML, CSS and JS, which will only take effect when activated.
Its characteristics are:
- Content does not display by default
- Will not be parsed and executed by the browser (for example, script or img)
- Can contain any legal HTML content
This makes it ideal for storing reusable UI fragments.
How to create reusable content using <template></template> ?
The basic usage process is: first define the template → then clone the content → and finally insert it into the DOM.
For example:
<template id="user-card">
<div class="card">
<h3>Username</h3>
<p>User Profile</p>
</div>
</template>
<script>
const template = document.getElementById('user-card');
const clone = template.content.cloneNode(true);
document.body.appendChild(clone);
</script>The above code will clone the contents in the template and insert it into the page. In this way, you can reuse this card structure in multiple places, just modifying the text content.
If you have multiple different user data, you can use a loop to generate multiple cards.
Dynamically populate content with data
It is not enough to have static content alone. In actual development, it is often necessary to generate content dynamically based on data. This can be achieved by manipulating the DOM element.
for example:
<template id="product-item">
<li class="product">
<h4></h4>
<p></p>
</li>
</template>
<script>
const template = document.getElementById('product-item');
const products = [
{ name: 'Mobile', desc: 'Latest Smartphone' },
{ name: 'Headphones', desc: 'Wireless Noise Cancelling Headphones' }
];
products.forEach(product => {
const clone = template.content.cloneNode(true);
clone.querySelector('h4').textContent = product.name;
clone.querySelector('p').textContent = product.desc;
document.querySelector('.product-list').appendChild(clone);
});
</script>This method is very suitable for building list components, such as product display, article list, etc.
Usage tips and precautions
- Do not operate the template content directly : because the template content is not in the current document stream, its child elements cannot be accessed directly, and must be cloned first.
- Avoid ID conflicts : If there is an ID in the template, multiple use will lead to duplicate IDs. It is recommended to use class or other options instead.
- Style scope : The styles in the template only take effect after insertion, pay attention to global style pollution.
- Powerful with Web Components : Used with Custom Elements to create fully encapsulated reusable components.
Basically that's it. Although the <template></template> tag looks simple, it is very practical in organizing and reusing front-end content, especially when large frameworks are introduced, it can save you a lot of repetitive work.
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