The tag is used to define reusable HTML templates that are not rendered immediately, and is commonly used to dynamically generate page content. It is not displayed directly, does not affect the initial performance, and is a pure front-end concept. Its uses include avoiding duplicate code, improving performance, and clear structure and easy maintenance. The usage process is divided into three steps: defining the tag, obtaining the template content through JavaScript, and inserting the DOM. The examples include defining templates, cloning content, and modifying data before inserting the page. The key method is document.importNode() to implement deep cloning. Common scenarios include Web Components development, dynamic list display, and lightweight framework alternatives.
The <template></template> tag in HTML is actually quite clear in purpose but is easily overlooked. Simply put, it is used to define a reusable content template that is not immediately rendered . The most common scenario is to dynamically generate page content with JavaScript.
tag used for?" /> What is the <template></template> tag?
You might confuse it with the backend template engine, but HTML's <template></template> is a pure front-end concept. The HTML content inside it will not be displayed directly when the page is loaded, nor will it affect the initial rendering performance. You can understand it as an HTML fragment "hidden" in the page, and then take it out when you need it.
Why use the <template></template> tag?
- Avoid duplicate code
- If you have a structure that often appears (such as list items, pop-up components), using
<template></template>can avoid writing a bunch of duplicate HTML or relying on JS spelling strings.
- If you have a structure that often appears (such as list items, pop-up components), using
- Improve performance
- When the page is loaded, the browser will not parse whether the content in
<template></template>needs to be rendered, so it will not cause unnecessary re-arrangement and redrawing.
- When the page is loaded, the browser will not parse whether the content in
- Clear structure and easy maintenance
- Keeping templates together is easier to modify and debug than scattered in JS strings.
How to use the <template></template> tag?
The basic process can be summarized into three steps:
tag used for?" />- Define
<template></template>in HTML - Get template content through JavaScript
- Insert content into the DOM
For example:
<template id="user-card">
<div class="card">
<h3></h3>
<p>Email: </p>
</div>
</template>
<script>
const template = document.getElementById('user-card');
const clone = document.importNode(template.content, true);
clone.querySelector('h3').textContent = 'Zhang San';
clone.querySelector('p').textContent = 'Email: zhangsan@example.com';
document.body.appendChild(clone);
</script>In this way, you will dynamically insert the template content.
tag used for?" />Tip:
document.importNode()is a key method for cloning template content. The second parametertruerepresents a deep cloning, that is, it contains child nodes.
What are the common usage scenarios?
Web Components Development
<template></template>is often used with custom elements as a structural template for components.Dynamic list or card display
For example, after obtaining user data from the interface, the user card is rendered cycleically.Front-end framework alternative
If you do not use React, Vue and other frameworks, native JS with<template></template>is a lightweight implementation method.
Basically that's it. Although it is not a necessary tag, in the right scenario, <template></template> can make the structure clearer and the logic cleaner. Not complicated but easy to ignore.
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