An id on a <template> tag assigns an identifier to the template.
The identifier must be unique across the page.
An id attribute on a <template> element.
Each time the button is clicked an item is added to the list.
<template id="item-template">
<li></li>
</template>
<ul id="list">
<li>Item 1</li>
</ul>
<button onclick="add();">Add List Item</button> <br />
<script>
let itemCount = 1;
let add = () => {
itemCount++;
let template = document.getElementById("item-template");
let content = template.content;
content.querySelector('li').textContent = "Item " + itemCount;
let row = template.content.cloneNode(true);
document.getElementById("list").appendChild(row);
}
</script>
The id attribute assigns an identifier to the <template> element.
The id allows JavaScript to easily access the <template> element.
It is also used to point to a specific id selector in a style sheet.
Tip: id is a global attribute that can be applied to any HTML element.
<template id="identifier" />
| Value | Description |
|---|---|
| identifier | A unique alphanumeric string. The id value must begin with a letter ([A-Za-z]) and may be followed by any number of letters, digits ([0-9]), hyphens (-), underscores (_), colons (:), and periods (.). |
A <template> with a unique id.
Each time the button is clicked a new row (i.e. template row) is added to the table.
| ID | Customer Name |
|---|---|
| 1 |
<style>
table.tb { width:300px; border-collapse: collapse; }
.tb th, .tb td { border: solid 1px #777; padding: 5px; }
.tb th { background: lightblue; }
</style>
<template id="mytemplate">
<tr>
<td><span></span></td>
<td><input type="text" name="name[]" value=""></td>
</tr>
</template>
<table id="user-table" class="tb">
<tr>
<th>ID</th>
<th>Customer Name</th>
</tr>
<tr>
<td><span>1</span></td>
<td><input type="text" name="name[]" value="Anna Kroger"></td>
</tr>
</table>
<button onclick="addRow();">Add Customer</button>
<script>
var counter = 1;
let addRow = () => {
counter++;
let template = document.getElementById("mytemplate");
let content = template.content;
content.querySelector('span').textContent = counter;
let row = template.content.cloneNode(true);
document.getElementById("user-table").appendChild(row);
}
</script>
The id attribute assigns a unique identifier for the <template>.
When the button is clicked, JavaScript locates the <template> through the id.
It extracts the <template> content and add it as the last child of the table.
Here is when id support started for each browser:
 Chrome
|
26.0 | Mar 2013 |
 Firefox
|
22.0 | Jun 2013 |
 IE/Edge
|
13.0 | Nov 2015 |
 Opera
|
15.0 | Jul 2015 |
 Safari
|
9.0 | Sep 2015 |
Back to <template>
