The <template> tag is a container in HTML5 for storing lazy content. It is not rendered directly when the page is loaded, but can be dynamically extracted and used through JavaScript. It is suitable for scenes where the same structure needs to be created repeatedly, such as generating lists, cards, or pop-ups. 1. The UI component structure can be predefined to improve component development efficiency; 2. Reduce the amount of code used to splice HTML in JS and enhance maintainability; 3. Improve page performance, because the template does not participate in rendering at the beginning. The steps to use include: define the template structure in HTML, use JavaScript to obtain and clone its contents, and insert the DOM after modification. Notes include: only effective in modern browsers, avoid directly embedding scripts or styles, and it is recommended to add class names or IDs for complex structures for operation.
The HTML <template></template> tag is a container for storing "lazy" content. It will not be rendered directly when the page is loaded, but can be dynamically extracted and used through JavaScript at runtime. This tag is especially suitable for scenarios where the same structure needs to be created repeatedly, such as dynamically generating lists, cards, pop-ups, etc.
What is the <template></template> tag?
Simply put, <template></template> is a "template repository" hidden in HTML. You can write a HTML structure inside, but it will not be displayed on the page and will not affect the rendering performance of the page. This part of the content will only truly "come alive" when you use JavaScript to get the content inside it and insert it into the document.
For example, you can write a template like this:
<template id="user-card">
<div class="card">
<h3>Username</h3>
<p>User Description</p>
</div>
</template>This code will not be displayed on the page unless you take it out and insert it into the DOM with JS.
The actual use of the <template> tag
- Component development : You can pre-defined the structure of the UI component and then copy an insert page when needed.
- Reduce duplicate code : Avoid splicing large amounts of HTML strings in JS to improve maintainability.
- Improve performance : Since the template content will not be rendered at the beginning, there will be no additional re-arrangement or redrawing.
For example: If you want to make a user list page, and each user displays the same way, you can first write the structure of a single user in <template> , and then clone a template content and fill it in each cycle of data.
How to use the <template> tag?
It's very simple to use, the basic steps are as follows:
- Define template structure in HTML
- Get template content with JavaScript
- Clone the template content
- Modify the content and insert it into the page
The sample code is as follows:
const template = document.getElementById('user-card'); const clone = template.content.cloneNode(true); clone.querySelector('h3').textContent = 'Zhang San'; document.body.appendChild(clone);
A few points to note:
-
contentattribute is the core part of the template -
cloneNode(true)is a deep copy, retaining all child nodes - Before inserting, you can operate the cloned content like a normal DOM.
Notes on using <template></template>
- It is only valid in browsers that support HTML5 (and modern browsers support it)
- Don't put scripts or styles directly inside, unless you know exactly how to deal with it
- If the template structure is complex, remember to add class name or ID to the element to facilitate subsequent operations
Basically that's it. Although it seems simple, using <template></template> rationally in actual projects can make the front-end logic clearer and the code cleaner.
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